Two-dimensional Conduction Research Articles

Na Conductive Polymer/Inorganic Composite Electrolytefor High Performance All-Solid-State Na Battery

The Na secondary batteries has been attracted attention by concerning depletion of elemental Li in the earth crust. However, as with conventional Li-ion batteries, Na batteries use flammable electrolytes including organic solvents such as ethylene carbonate, propylene carbonate. Therefore, battery systems are demanded to shift all-solid-state battery for the increasing safety. Although the β-Al2O3 is used as solid electrolyte of all-solid-state Na battery by using inexpensive material, ionic conductivities are low value due to having two-dimensional ion conduction path. In the contrast, the Na super ionic conductor (NASICON) were reported by Hong [1] as an inorganic electrolyte showing high ionic conductivity (10-4~10-3 Scm-1 at room temperature) by three-dimensional conduction path. However, in the case of pellet electrolytes fabricated by sintering method, capacity of all-solid-state battery exhibits low value due to low interfacial stability and high resistance between electrode and electrolyte. Therefore, we propose composite electrolyte of inorganic and polymer materials in order to fabricate new type solid electrolyte having high interfacial stability, ionic conductivity and flexibility. Herein, we report morphology, electrochemical properties and stability with Na metal anode on Na conductive polymer/inorganic composite electrolytes. Polymer/inorganic composite electrolytes were prepared by mixing of polyether-based macro monomer, NaN(SO2CF3)2 as an alkaline salt, 2, 2-dimethoxy-2-phenylacetophenone as a photoinitiator, acetonitrile as a solvent and Na3Zr2Si2PO12 (NZSP) powder as an inorganic electrolyte of NASICON type electrolyte. The composition percentage of NZSP were changed between 0 to 300wt%. After stirring, vacuum dried viscous liquid were casted to glass substrate and polymerized by UV irradiation to form composite electrolyte films. Thermal, transport and molecular properties of composite electrolytes were investigated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and AC impedance method, respectively. Fourier transform infrared spectroscopy (FR-IR) was applied in order to investigate interaction into composite electrolytes. Moreover, interfacial resistances were measured by AC impedance on Na symmetric cells which were maintained 60oC in order to evaluate interfacial stability. Fig. 1 show prepared polymer electrolyte (0 wt% NZSP) and composite electrolyte containing 30wt% NZSP powder (30wt% NZSP). In comparison with 0wt% sample, 30wt% sample exhibited high flexibility by improving stress distribution due to high ability of dispersion of NZSP particles, following Fig. 1(d). The composition dependence on glass transition temperature (T g), which is defined as the phase transition point glass state to rubber state, exhibited to decreasing tendency of T gs with addition NZSP under approximately 100wt% NZSP from Fig. 2. The decreasing T gs were considered to cause by interaction between polymer and inorganic electrolyte or ions (cation, anion) and inorganic electrolyte particles. Moreover, this phenomena could expect increasing ionic conductivity because of improving segmental motion of polymer and cationic mobility. In the over 100wt% NZSP samples, changing T g were not confirmed. In the comparison with 0wt% NZSP and 300wt% NZSP sample on Nyquist plots, although 0wt% NZSP sample showed symmetric semicircle spectrum, 300wt% sample showed asymmetric semicircle. In order to investigate detail of this phenomena, 300wt% sample was attempted to separate resistance components. As a result, two resistance components were contained, bulk resistance (R b) and grain boundary resistance (R gb) between NZSP particles. Fig. 3 show NZSP composition dependence on ionic conductivity. In the low composition range (<100wt% NZSP), relatively high value were confirmed in comparison with 0wt%. In the contrast, over 100wt% NZSP samples exhibited low value including Rb and Rgb by contribution of presence of high R gb. The composition dependence on interfacial resistance (R i) between Na metal and electrolyte is shown Fig. 4. The R i exhibited lowest value at 200wt% NZSP sample from Fig. 4. The 200wt% NZSP sample was considered to the change point for Na ion transport mechanism. Therefore, R i were suggested to could decrease by addition NZSP from above results. The polymer/inorganic electrolytes shifted difference transport mechanism from low to high composition range. Although ionic conductivity showed relatively high value in the low composition range, low value were confirmed over 100 wt% NZSP samples. The increasing ionic conductivity were considered to cause by improving segmental motion because of some interaction of composite electrolyte. The high composition range showed low value due to presence of high R gb. In the interfacial stability, R i exhibited lowest value at 200wt% NZSP sample. Therefore, the composite electrolytes of optimal composition are expected to realize high-rate operated all-solid-state Na battery. [1] H. Hong, et., al., Mat. Res. Bull., 11, 173-182 (1976). Figure 1

A workflow for bedrock thermal conductivity map to help designing geothermal heat pump systems in the St. Lawrence Lowlands, Québec, Canada

An accurate knowledge of the subsurface thermal conductivity is essential to design geothermal heating and cooling systems, specifically ground-coupled heat pumps. The subsurface thermal conductivity has a direct impact on the length of vertical ground heat exchangers needed to fulfill building energy needs. However, mapping the distribution of the subsurface thermal conductivity is a significant challenge due to the ground heterogeneity and the limited radius of influence associated with thermal conductivity assessment methods. Data from 79 thermal response tests, 90 thermal conductivity analyses conducted in the laboratory, and geophysical well logs from 72 oil and gas exploration wells were combined and analyzed together in an attempt to map the bedrock thermal conductivity distribution of the St. Lawrence Lowlands, Québec, Canada. Results from laboratory and well log analysis were adjusted for field scale-effects using thermal response tests to properly define a statistically reliable thermal conductivity for each thermostratigraphic unit of this sedimentary basin. The thermal conductivity obtained from thermal response tests and adjusted laboratory analyses was interpolated with sequential Gaussian simulations to generate a two-dimensional bedrock thermal conductivity map, which can be used by geothermal system designers to better understand the geothermal heat pump potential of the St. Lawrence Lowlands.

Effects of electronic friction from the walls on water flow in carbon nanotubes and on water desalination.

A mechanism for removal of salt from salt water is discussed, which results from friction due to Ohm's law heating, resulting from motion of an electron charge induced in the tube walls by the water molecules' dipoles and the ions' charges. The desalination occurs because this friction is larger for salt ions than for water molecules. Friction due to Ohm's law heating might also provide an explanation for the observation by Secchi etal. [Nature 537, 210 (2016)10.1038/nature19315] that the flow velocity of water in carbon nanotubes for a given pressure gradient increases rapidly as the tube radius decreases from 50 to 15 nm, which does not occur for boron nitride nanotubes, which are insulators. This friction can have the right magnitude to produce the slip lengths reported by Secchi etal. One possibility is that the nanotubes in this experiment were metallic, and their conductivity becomes large as their radius decreases, due to ballistic conduction. Another possibility is that when the tube circumference drops below the electron mean-free path, the wall switches from behaving as a two-dimensional conductor to behaving as a one-dimensional conductor for which the electrons are more strongly localized. When the conductivity is sufficiently small, small displacements of the localized electron states can provide the dominant contribution to the motion of the induced charge, rather than current flow, thus reducing the friction due to Ohm's law heating.

Five novel palladium(II) complexes of 8-hydroxyquinoline and amino acids with hydrophobic side chains: synthesis, characterization, cytotoxicity, DNA- and BSA-interaction studies

The side effects and resistance of metal-based anticancer drugs prompted us to synthesis a novel series of five Pd(II) complexes of the type [Pd(8-QO)(AA)]; where 8-QO = anion of 8-hydroxyquinoline and AA = anions of amino acids having nonpolar aliphatic side chain such as glycine (–H), alanine (–CH3), valine (–CH(CH3)2), leucine (–CH2–CH(CH3)2) and isoleucine (–CH(CH3)CH2–CH3). The complexes have been characterized with the help of FT-IR, UV–Vis, one and two-dimensional 1H-NMR, elemental analysis and conductivity measurements. On the basis of these characterization data, a four coordinated square planar geometry for all of these complexes have been proposed. The compounds were screened for their in vitro activities against human cancer cell line, MOLT-4 and their 50% inhibition concentration were ascertained by means of MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay. Since four out of the five newly synthesized compounds were found to be more active than the standard anticancer drug, cisplatin, their detailed interaction with calf thymus DNA (as a target) and bovine serum albumin (BSA) (as a carrier) were also carried out by utilizing absorption spectra, fluorescence spectra and ethidium bromide displacement studies. In these experiments, several binding and thermodynamic parameters were also calculated. These results suggested that hydrogen binding and van der Waals forces play a major role in the interaction between metal complexes with CT-DNA and BSA. Communicated by Ramaswamy H. Sarma

Towards harmonizing the NFRC and CEN window performance simulation methods

Studies have found that the European Committee for Standardization (CEN) and National Fenestration Rating Council (NFRC) methods produce different U-values for the same window resulting in confusion when comparing products. A comparative evaluation of the NFRC and CEN U-value calculation methods was conducted for North American residential high-performance window products with focus on the most influential parameters in determining the whole window U-value for high-performance windows. Using two-dimensional conduction simulation software, four North American high-performance frame types with double, triple, and quad glazing combinations were simulated and calculated according to the NFRC and CEN standard methods. Overall, the trend showed that for the specific window combinations of this study, the higher the performance of the insulated glazing unit (IGU), the lesser the differences in the whole window U-value of both methods. The results showed an overall difference of 1 to 11% in whole window U-value when using the NFRC and CEN standards, lower than other studies. Generally, the NFRC standard resulted in the lower U-value for each case. Recommendations for harmonization of the two standards include aligning boundary conditions, frame cavity models, and material conductivities.

Evaluation of thermoelastic damping in micromechanical resonators with axial pretension: An analytical model accounting for two-dimensional thermal conduction

It has been reported that application of tensile axial stress can simultaneously increase quality factor and resonant frequency for micromechanical resonators. In this study, we formulate an analytical model for evaluating thermoelastic damping in micromechanical resonators based on the thermal energy method, in which thermal conductions in both thickness direction and axial direction are considered. An explicit expression for thermoelastic damping in the form of infinite series has been obtained. The proposed analytical model is further validated by finite element analysis. Results of the present study demonstrate that the 2D model needs to be adopted in order to accurately evaluate thermoelastic damping of micromechanical resonators with axial pretension. In addition, the 2D model proposed in the present study eliminates the inherent inconsistency entailed in the 1D model.

Multifunctional Two-Dimensional PtSe2-Layer Kirigami Conductors with 2000% Stretchability and Metallic-to-Semiconducting Tunability.

Two-dimensional transition-metal dichalcogenide (2D TMD) layers are highly attractive for emerging stretchable and foldable electronics owing to their extremely small thickness coupled with extraordinary electrical and optical properties. Although intrinsically large strain limits are projected in them (i.e., several times greater than silicon), integrating 2D TMDs in their pristine forms does not realize superior mechanical tolerance greatly demanded in high-end stretchable and foldable devices of unconventional form factors. In this article, we report a versatile and rational strategy to convert 2D TMDs of limited mechanical tolerance to tailored 3D structures with extremely large mechanical stretchability accompanying well-preserved electrical integrity and modulated transport properties. We employed a concept of strain engineering inspired by an ancient paper-cutting art, known as kirigami patterning, and developed 2D TMD-based kirigami electrical conductors. Specifically, we directly integrated 2D platinum diselenide (2D PtSe2) layers of controlled carrier transport characteristics on mechanically flexible polyimide (PI) substrates by taking advantage of their low synthesis temperature. The metallic 2D PtSe2/PI kirigami patterns of optimized dimensions exhibit an extremely large stretchability of ∼2000% without compromising their intrinsic electrical conductance. They also present strain-tunable and reversible photoresponsiveness when interfaced with semiconducting carbon nanotubes (CNTs), benefiting from the formation of 2D PtSe2/CNT Schottky junctions. Moreover, kirigami field-effect transistors (FETs) employing semiconducting 2D PtSe2 layers exhibit tunable gate responses coupled with mechanical stretching upon electrolyte gating. The exclusive role of the kirigami pattern parameters in the resulting mechanoelectrical responses was also verified by a finite-element modeling (FEM) simulation. These multifunctional 2D materials in unconventional yet tailored 3D forms are believed to offer vast opportunities for emerging electronics and optoelectronics.

A comparative analysis of the accuracy of Kubo formulations for graphene plasmonics

In recent years, there has been a growing need for the design and fabrication of smaller, faster, low-consumption and high-performance devices, as well as the technology approaches to the integration of electronics and photonics. This has led to the wide use of plasmonic structures. On the other hand, the excellent optical and electrical properties of graphene have made it a suitable material for plasmonic applications. The graphene properties can be manipulated by operation frequency and tuning its Fermi energy. Fermi energy of graphene can be tuned through electric gating or chemical doping. A phenomenon called Pauli blocking governs the interband transitions in graphene, and it is worth noting that since Pauli blocking is directly related to the Fermi energy of graphene, all parameters tuning the Fermi energy of graphene lead to variation of the imaginary parts of graphene’s permittivity and refractive index. Many applications of graphene in plasmonics rely on this property. Since the permittivity and refractive index formulas of graphene are extracted from its two-dimensional conductivity called the Kubo formulation, the accurate calculation of graphene’s two-dimensional conductivity is very important. In this paper, for the first time to our knowledge, the available Kubo formulations have been analyzed and compared so that the most accurate Kubo formulation could be chosen for plasmonic applications. Also, a comprehensive and detailed study about the properties of graphene including surface conductivity, permittivity, refractive index and plasma frequency, along with a sensitivity analysis for its refractive index and plasma frequency are accomplished.

Moutard transforms for the conductivity equation

We construct Darboux–Moutard-type transforms for the two-dimensional conductivity equation. This result continues our recent studies of Darboux–Moutard-type transforms for generalized analytic functions. In addition, at least, some of the Darboux–Moutard-type transforms of the present work admit direct extension to the conductivity equation in multidimensions. Relations to the Schrödinger equation at zero energy are also shown.

(Invited) Atomic-Scale Exploration of Synthetic Low Dimensional Materials

Low-dimensional materials functioning at the nanoscale are a critical component for a variety of current and future technologies. From the optimization of light harvesting solar technologies to large-scale catalytic processes, key physical phenomena are occurring at the nanometer and atomic length-scales and predominately at interfaces. For instance, graphene is a nearly ideal two-dimensional conductor that is comprised of a single sheet of hexagonally packed carbon atoms. In order fully realize the potential of graphene for novel electronic applications, large-scale synthesis of high quality graphene and the ability to control the electronic properties of this material on a nanometer length scale are key challenges. In addition to graphene, we are interested in exploring the synthesis of low-dimensional materials that do not occur in nature. This talk will highlight how scanning probe microscopy presents a series of powerful experimental tools that can overcome several challenges and allow for the direct characterization of several advanced materials. This talk will also cover our most recent discovery and synthesis of new two-dimensional (2D) boron allotropes (borophenes). This discovery of metallic 2D sheets of boron presents almost ideal example of the synergy between predictive modeling resulting in the experimental realization of a designer materials.

Fabrication of Composite Heat Sinks Consisting of a Thin Metallic Skin and a Polymer Core Using Wire-Arc Spraying

Three composite heat sinks in the shape of a disk, a cylinder, and a cylinder with vertically projecting fins were made by applying a thin (0.4-0.7 mm) zinc layer onto ABS polymer cores using wire-arc spraying. The influence of spray distance and surface roughness on the adhesion strength between the zinc and ABS layers was investigated, and a maximum adhesion strength of 2.6 MPa was obtained. An analytical model of the heat conduction in an annular fin was developed, assuming one-dimensional heat conduction in the metal coating and two-dimensional conduction in the polymer core. The temperature distribution along the disk-shaped heat sink was measured using an infrared camera and found to agree well with the developed model. The calculated temperatures at the base of the heat sink also agreed with measured values as heater power was varied. The model was used to examine the effect of fin radius and coating thickness on fin efficiency.

Performance and Characterization of Two-Dimensional Material Graphene Conductivity—A Review

Abstract Graphene material is made from graphite using different techniques. The development of graphene material is now at a very initial stage even though a lot of research is conducted to analyze the electrical and thermal feature of graphene. Graphene is considered an epoch-making invention that has a two-dimensional single lattice. Hexagonal bonding also exists. The main limitation of graphene is that it cannot form a band gap because of its high attraction of intermolecular atoms, but the researchers’ main challenges are to find out the processes by which this critical issue can be solved. As a matter of fact, graphene is the hardest material in the earth today. In the research field, researchers are presently trying to make graphene a conductor or semiconductor by forming energy gaps. In this review article, literature is mentioned to understand the thermal and electrical conductivity of graphene in various layers through the process of emissivity, microwave absorption, etc. This article can be considered state of art for future research in the industry.

Two Dimensional Performance Analysis of Small HTR Residual Heat Removal System in DLOFC Condition

This research is aimed to investigate a 10 MWth HTR thermal parameter response to long-term Depressurized Loss Of Force Cooling (DLOFC) accidents. By using two dimensions analysis in radial and vertical direction, comparing to one dimension in radial, the results are expected to be closer to real conditions. The method used is firstly develop a Matlab-based temperature distribution analysis program that solves the two-dimensional conduction equation in cylindrical coordinates and also in a function of time. Using the program, DLOFC simulations were conducted over a period of 588 hours after 200 hours of time needed to reach steady state close to normal operating conditions. It can be evaluated how far the temperature of all reactor components starting from the core to the concrete wall will rise and whether they are within their safety limits. The results show that during DLOFC, temperature of all reactor components increase toward the maximum value before decreasing again. The maximum temperature of the reactor core, reactor vessel and concrete wall are respectively 1080°C, 231°C, and 96.1 °C. The maximum value of the core temperature is reach at 11.1 hours after accident. The water temperature in the cooling panel, for 50 m3 of water volume, has reached its boiling point of 100°C at around 100 hours after DLOFC and decreasing again at the time of 360 hours. Evacuation of the residual heat is not only through the cooling water panel, but also through the three directions of concrete wall, ie top surface, peripheral surface and bottom surface. During DLOFC, the maximum heat power evacuated through top, bottom and peripheral surface are respectively 4.57 kW, 4.84 kW and 29.04 kW. The maximum heat power evacuated by water panel is 52.7 kW. It can be concluded that the reactor remains safe in very long time of DLOFC.

Influence of MoS₂ Nanosheet Size on Performance of Drilling Mud.

Water-based drilling mud (WBM) is a non-Newtonian fluid that has a variety of applications such as in transporting cuttings during drilling, protecting the borehole, and cooling the drill bit. With the development of nano-technology, various nanoparticles have been synthesized and have been added to WBM to improve its performance. Shear thinning is the most important factor in drilling mud and this attribute can be improved when two-dimensional particles are added. MoS2 nanoparticles, which represent a typical two-dimensional material, are easy to synthesize in large quantities and have a high thermal conductivity and low coefficient of friction. Since the two-dimensional structure, thermal conductivity, and low coefficient of friction of MoS2 would improve the performance of WBM, we experimented with MoS2 nanosheets as an additive, under optimal conditions, using various samples each with uniform sizes and thicknesses of nanosheets. A large amount of MoS2 nanosheets was synthesized, sorted by thickness and diameter, and added to drilling mud. The diameter of MoS2 was divided into a small diameter group (about 100–400 nm) and a big diameter group (about 300–650 nm), and the thickness was divided into 1–2 nm and 5–10 nm groups. Experimental results showed that when MoS2 is added to WBM, shear thinning occurs more strongly. In addition, the addition of MoS2 with a thickness of 1–2 nm and a diameter of 300–650 nm resulted in the highest increase in viscosity and thermal conductivity of WBM. As a result, we experimentally confirmed that MoS2 can be used as an additive to increase the thermal conductivity and viscosity of WBM and to make shear thinning phenomenon more.

A Novel Spacetime Collocation Meshless Method for Solving Two-Dimensional Backward Heat Conduction Problems

A Novel Spacetime Collocation Meshless Method for Solving Two-Dimensional Backward Heat Conduction Problems

Nonlinear electromagnetic response of few-layer graphene: A nonperturbative description

Nonperturbative approach based on exact solution of Boltzmann kinetic equation in the relaxation time approximation is developed for the study of nonlinear response of electron-doped few-layer graphene to a high-frequency electromagnetic field. It is shown that nonperturbative approach can be applied to a two-dimensional conductor with an arbitrary isotropic spectrum of carries. The cases of ABC stacked three-layer and ABC staked four-layer graphene are considered. The low-energy electron spectrum of such graphenes is characterized by the third and the fourth power in the momentum dependence, correspondingly. The transmission, reflection and absorption coefficients are calculated. It is shown that the transmission coefficient T of three- and four-layer graphene decreases under increase in the intensity of the incident wave I by the asymptotic law 1/2 T I  and 2/3 T I  , respectively. It is found that three-layer and four-layer graphenes demonstrate power-induced reflectance, in contrast to power-induced transparency in monolayer graphene. It is found that in the four-layer graphene irradiated by a monochromatic wave the induced electrical current contains only the first and the third harmonics. The analytical expression for the efficiency of the third-harmonic generation GTGH (the ratio of the intensity of third-harmonic radiation to the intensity of the incident wave) of the four-layer graphene is obtained. It is shown that only at rather small incident wave intensity the efficiency GTGH is proportional to the second power of I and at large incident wave intensity the efficiency GTGH approaches the constant quantity. Saturation of the efficiency of the third-order harmonic generation is caused by the increase of the reflection. In contrast, the efficiency of the third-order harmonic generation of monolayer graphene depends nonmonotonically on the intensity of the incident wave. The maximum is reached at rather small intensity I аnd the efficiency in the maximum is of order of 10-4 that is two orders of magnitude smaller than of four-layer graphene.

Ultralow Interlayer Friction of Layered Electride Ca2N: A Potential Two-Dimensional Solid Lubricant Material

Dispersion-corrected density functional theory (DFT) calculations reveal that the layered electride of dicalcium nitride (Ca2N) exhibits stronger interlayer binding interactions but lower interlayer friction behavior than that of traditional layered lubricants weakly bonded by van der Waals (vdW) interactions, such as graphite, h-BN, and MoS2. These results are attributed to the two-dimensional (2D) homogeneous conduction electrons distribution in the middle of the interlayer space of Ca2N, which yields a smooth sliding barrier and hence ultralow friction behavior. The interesting results obtained in this study have not only broadened the scope of 2D solid lubricants but also enriched the physical understanding of ultralow friction mechanism for 2D systems.

Modified PO–PO hybrid method for scattering of 2D ship model on the rough sea surface

The hybrid physical optics-physical optics (PO-PO) method was introduced in the previous works to compute the electromagnetic scattering from an object above a random rough surface. Here, first, the conventional PO-PO method is applied to find the scattering from a simple smooth two-dimensional (2D) perfect electric conductor (PEC) object on a one-dimensional (1D) rough PEC surface. Then, this method is modified to be used to calculate the scattering from a complex sharp-cornered 2D PEC target on the 1D random rough PEC surface. In addition, here, the physical theory of diffraction is utilised to take into account the diffraction from the edges of the target. The accuracy and efficiency of the proposed method are validated by the method of moments.

Coherent Electron Trajectory Control in Graphene.

We investigate coherent electron dynamics in graphene, interacting with the electric field waveform of two orthogonally polarized, few-cycle laser pulses. Recently, we demonstrated that linearly polarized driving pulses lead to sub-optical-cycle Landau-Zener quantum path interference by virtue of the combination of intraband motion and interband transition [Higuchi etal., Nature 550, 224 (2017)NATUAS0028-083610.1038/nature23900]. Here we introduce a pulsed control laser beam, orthogonally polarized to the driving pulses, and observe the ensuing electron dynamics. The relative delay between the two pulses is a tuning parameter to control the electron trajectory, now in a complex fashion exploring the full two-dimensional reciprocal space in graphene. Depending on the relative phase, the electron trajectory in the reciprocal space can, e.g., be deformed to suppress the quantum path interference resulting from the driving laser pulse. Intriguingly, this strong-field-based complex matter wave manipulation in a two-dimensional conductor is driven by a high repetition rate laser oscillator, rendering unnecessary complex and expensive amplified laser systems.

New triple molybdate Rb2AgIn(MoO4)3: synthesis, framework crystal structure and ion-transport behaviour.

A new triple molybdate, Rb2Ag1+3xIn1-x(MoO4)3 (0 ≤ x ≤ 0.02), was found in the course of a study of the system Rb2MoO4-Ag2MoO4-In2(MoO4)3 and was synthesized as both powders and single crystals by solid-state reactions and spontaneous crystallization from melts. The structure of Rb2Ag1+3xIn1-x(MoO4)3 (x ≉ 0.004) is of a new type crystallizing in the centrosymmetric space group R-3c [a= 10.3982 (9), c = 38.858 (4) Å, Z = 12 and R = 0.0225] and contains (In,Ag)O6 octahedra and distorted Ag1O6 trigonal prisms linked by common faces to form [Ag(In,Ag)O9] dimers connected to each other via MoO4 tetrahedra into an open three-dimensional (3D) framework. Between two adjacent [Ag(In,Ag)O9] dimers along the c axis, an extra Ag2O6 trigonal prism with about 1% occupancy was found. The Ag1O6 and Ag2O6 prisms are located at levels of z ≉ 1/12, 1/4, 5/12, 7/12, 3/4 and 11/12, and can facilitate two-dimensional ionic conductivity. The 12-coordinate Rb atoms are in the framework cavities. The structure of Rb2AgIn(MoO4)3 is a member of the series of rhombohedral 3D framework molybdate structure types with a ≉ 9-10 Å and long c axes, which contain rods of face-shared filled and empty coordination polyhedra around threefold axes. Electrical conductivity of ceramics is measured by impedance spectroscopy. Rb2AgIn(MoO4)3 undergoes a `blurred' first-order phase transition at 535 K with increasing electrical conductivity up to 1.1× 10-2 S cm-1 at 720 K. Thus, the compound may be of interest for developing new materials with high ionic conductivity at elevated temperatures.