Preparation Of Nanorods Research Articles

Controllable preparation of CsPbI3 nanorods by laser-assisted solvothermal method

Laser has received widespread attention in research on assisting the preparation of nanomaterials due to its good monochromaticity, high coherence and energy concentration. In this work, we report a simple and efficient large-scale preparation of CsPbI3 nanorods using a laser-assisted solvothermal method. By adjusting the wavelength (375 nm, 405 nm, 520 nm) and light intensity of the laser, the length and cross-sectional width of the nanorods can be significantly adjusted, reflecting the controllable preparation of CsPbI3 nanorods. In particular, under the irradiation of 375 nm laser with a light intensity of 84.2 mW/cm2, the length of the nanorods is reduced by 40.9 % and the cross-section width is increased by 62.6 %. The controllable preparation of CsPbI3 nanorods is mainly attributed to the laser energy promoting nucleation and promoting ligand desorption.

Surface-Enhanced Raman Scattering for Probe Detection via Gold Nanorods and AuNRs@SiO2 Composites

In this paper, a self-assembly method was used to prepare gold nanorod composites, and a seed-growth method was used to adjust the amount of AgNO3 solution, enabling the preparation of gold nanorods with different aspect ratios. AuNRs@SiO2 nanocomposite particles were then prepared by using the Stöber method to coat the gold nanorod surface with silica. Transmission electron microscopy showed that the maximum aspect ratio of the gold nanorods was 4.53, which was achieved using 2 mL of 10 mM AgNO3 solution. The Raman-scattering intensity of the gold nanorods was studied using rhodamine 6G, thiram, melamine, and piroxicam, and detection limits of 10−8 M, 10−5 M, and 10−3 M were, respectively, achieved. As a substrate, these gold nanorods showed good repeatability and reproducibility, and trace detection was successfully achieved. A transmission electron microscopy analysis shows that the SiO2 shell became thicker with increasing tetraethyl orthosilicate addition. Using AuNRs@SiO2 as the base and R6G, thiram, and piroxicam as the probes, measurable detection limits of 10−9 M, 10−6 M, and 10−5 M were achieved, and this composite also showed excellent repeatability and reproducibility.

The Effect of the Solution Flow and Electrical Field on the Homogeneity of Large-Scale Electrodeposited ZnO Nanorods.

In this paper, we demonstrate the significant impact of the solution flow and electrical field on the homogeneity of large-scale ZnO nanorod electrodeposition from an aqueous solution containing zinc nitrate and ammonium nitrate, primarily based on the X-ray fluorescence results. The homogeneity can be enhanced by adjusting the counter electrode size and solution flow rate. We have successfully produced relatively uniform nanorod arrays on an 8 × 10 cm2 i-ZnO-coated fluorine-doped tin oxide (FTO) substrate using a compact counter electrode and a vertical stirring setup. The as-grown nanorods exhibit similar surface morphologies and dominant, intense, almost uniform near-band-edge emissions in different regions of the sample. Additionally, the surface reflectance is significantly reduced after depositing the ZnO nanorods, achieving a moth-eye effect through subwavelength structuring. This effect of the nanorod array structure indicates that it can improve the utilization efficiency of light reception or emission in various optoelectronic devices and products. The large-scale preparation of ZnO nanorods is more practical to apply and has an extremely broad application value. Based on the research results, it is feasible to prepare large-scale ZnO nanorods suitable for antireflective coatings and commercial applications by optimizing the electrodeposition conditions.

Colorimetric detection of α-glucosidase activity using Ni-CeO2 nanorods and its application to potential natural inhibitor screening

In this work, we established an exceptionally facile method for the preparation of Ni-CeO2 nanorods in a kind of deep eutectic solvents (DESs) composed of l-proline and Ce(NO3)3·6H2O. First, Ni-CeO2 nanorods were successfully prepared by adding Ni(NO3)3·6H2O to DESs. Then, we found that Ni-CeO2 nanorods prepared in DESs have more prominent oxidase-like activity than pure CeO2. The outstanding catalytic activity of Ni-CeO2 could be ascribed to its high Ce3+/Ce4+ ratio. As a proof-of-concept application, the Ni-CeO2 nanorods were successfully acted as a colorimetric platform for the sensitive determination of ascorbic acid and α-glucosidase activity, which displays excellent analytical performance. Moreover, this sensing platform was applied for screening natural α-glucosidase inhibitors, such as terpenoids from natural products. The results indicated that ursolic acid and oleanolic acid had good inhibitory rates. This strategy not only provides a new way to construct more kinds of nanomaterials from DESs, but also offers a facile and effective tool to screen the α-glucosidase natural inhibitors as potential anti-diabetic drugs.

Gold Nanorods - An Overview

This article provides an overview of current research in structure, synthesis, properties, application of gold nanorods. Interest in rod- shaped nanoparticles steam of unique optical properties, A gold nanorod is defined as nanometer-sized gold particles that are rod shaped. These solid, cylindrical nanoparticles have uniform diameters ranging from a few nanometers to hundreds of nanometers, with aspect ratios (length/diameter) larger than 1 but typically smaller than 10. The most popular and successful method for creating high-quality gold nanorods is seed-mediated development. optical properties of gold nanorods, absorption spectrum of colloidal dispersion of gold nanorods, local field effect and sensing application, color of colloidal dispersion of gold nanorod, polarization dependent color and absorption in polymer gold. Gold nanorods are utilized in a range of applications including biosensing, photothermal therapy, bioassays, biomedical imaging, and drug delivery. All these properties make gold nanorod a good candidate for future nanoelectronics in this article, we will describe the preparation and characterization of gold nanorods.

Facile preparation of PDI nano-rods coupled with AgBr for enhanced photocatalytic performance

Organic-inorganic perylene diimide modified AgBr photocatalyst (PDISA/AgBr) was produced using a chemical co-precipitation method. The chemical structure, surface element composition, and appearance morphology of the prepared photocatalyst were characterized by XRD, FTIR, XPS, and SEM. The test results showed that the introduction of PDISA could broaden the light absorption range and enhance the light absorption ability of AgBr, meanwhile, promote the separation of photo-induced charge. Under light irradiation, PDISA/AgBr composite might effectively degrade Rhodamine B (RhB) organic pollutant. Compared with bare AgBr, the degradation rate of PDISA/AgBr was increased 4.21 times. The main active substance that played a role in the photocatalytic degradation process was ·O2−. Finally, based on the obtained results, the type Ⅱ mechanism is inferred.

Preparation and photothermal therapy of gold nanorods modified by Belamcanda chinensis (L.) DC polysaccharide

In recent years, the application of nanoparticles formed by coupling metal nanomaterials of photothermal therapy with polysaccharides as modified carriers in the targeted treatment of liver cancer has attracted extensive attention. In the present work, an undescribed homogeneous polysaccharide BCP50–2 was obtained from Belamcanda chinensis (L.) DC. The structural analysis displayed that BCP50–2 contained galactose and a small amount of arabinose, and was mainly composed of six monosaccharide residues: →3,5)-α-l-Araf-(1→, →4)-β-d-Galp-(1→, →4,6)-β-d-Galp-(1→, →3)-α-l-Galp-(1→, terminal α-l-Araf, and terminal β-d-Galp. To enhance the antitumor activity of BCP50–2, BCP50–2-AuNRs were prepared by coupling BCP50–2 with gold nanorods for the treatment of liver cancer. BCP50–2-AuNRs were rod-shaped with a long diameter of 26.8 nm and had good photothermal conversion effects. Under near-infrared (NIR) light irradiation, BCP50–2-AuNRs possessed photothermal effects and suppressed the growth of HepG2, A549, and MCF-7 cells. In addition, BCP50–2-AuNRs inhibited the development of liver cancer by inducing cell apoptosis, arresting the cell cycle in G2/M phases, and inhibiting cell migration. Moreover, BCP50–2-AuNRs inhibited tumor proliferation, migration, and angiogenesis in zebrafish. In summary, BCP50–2-AuNRs may be potentially useful for cancer treatment.

Study on Nanomaterials with Inhibitory Effects on the Growth of Aspergillus niger.

In this paper, the inhibitory effect of various nanomaterials on the growth of Aspergillus niger was studied. Among them, copper nanorods had the most obvious inhibitory effect on the growth of Aspergillus niger. The phase of copper nanorods was modified by chitosan, and its inhibitory effect on the expansion of Aspergillus niger was measured. 1. Preparation of copper nanorods and chitosan@copper nanorods: Copper nanorods with a diameter of about 300-350 nm and a length of about 100-800 nm were prepared by the liquid-phase reduction method. The chitosan solution was prepared by using the characteristics of chitosan dissolved in dilute acid to prepare chitosan@copper nanorods and modify the phase of copper nanorods. 2. Determination of the inhibitory effect of various copper nanomaterials on the growth of Aspergillus niger, including Cuprous Oxide nanoparticles, copper nanorods, nano copper oxide, and copper hydroxide, which have certain inhibitory effects on the growth of Aspergillus niger. Among them, copper nanorods have a better effect. On this basis, chitosan@copper nanorods are obtained by modifying the phase of copper nanorods with chitosan. The measured antibacterial effect is that the EC50 value is 344 mg/L.

Synergistic co-sensitization of environment-friendly chlorophyll and anthocyanin-based natural dye-sensitized solar cells: An effective approach towards enhanced efficiency and stability

This study reports on the preparation of TiO2 nanorods (TNRs) and their application in dye-sensitized solar cells (DSSCs) to enable the production of efficient sources of energy for use in ambient indoor circumstances. The aim of the study is to enhance the efficiency and stability of DSSCs while also making them more affordable and eco-friendly. To achieve this, a novel approach was taken through the synergistic co-sensitization of environment-friendly natural dyes based on Spinacia Oleracea Leaves (SOL: chlorophyll) and Ixora Coccinea Flowers (ICF: anthocyanin). The combination of these dyes improved light absorption and charge separation, leading to enhanced power conversion efficiency. Various physicochemical characterizations of TNRs and dyes were performed and the co-sensitized dyes exhibited greatly enhanced visible-light photo-electrochemical performance which were later evaluated by J-V and electrochemical impedance spectroscopy (EIS) studies. Additionally, the role of various economical and environment-friendly counter electrodes was investigated. Using this co-sensitization technique, FTO/c-TiO2/TNRs/dyes/electrolyte/(C, Ninp, Nip) structured DSSCs were designed for the production of power under ambient light conditions. The optimal PCE of 2.39% is achieved under the artificial irradiation of ∼ 996 Wm−2 which is 2.3 and 4.2- times greater efficiency compared to single natural SOL and ICF-dyes-based DSSCs, respectively. Moreover, the synergistically co-sensitized DSSCs showed improved stability under prolonged light soaking (∼450 h) and storage conditions (at 27 °C). This study highlights the potential of PV technologies in enabling buildings and movable gadgets to become more independent and smarter while also providing an efficient source of energy for use in ambient indoor circumstances.

Preparation of superhydrophilic-underwater superoleophobic silica nanorods modified fiber membrane for efficient oil-in-water emulsion separation

Silica nanorods modified fiber membranes were successfully fabricated for the separation of emulsions by filtration deposition method. Compared to the unmodified membranes, the arithmetic mean and root mean square of the membranes were 5.69 μm and 9.71 μm, with an improvement of 39.8% and 46.0%, respectively. Roughness increases improved hydrophilicity and underwater oleophobicity of the membrane. The instantaneous water contact angle (WCA) and underwater oil contact angle (UOCA) reached 0° and 151.92°, showing excellent superhydrophilic and underwater superoleophobic properties. The structural stability of the membranes was demonstrated by testing the mass and microstructural changes after continuous ultrasonic treatment, where the mass loss was only 5.42% and no significant changes in the microstructure were observed. Moreover, following immersion treatment with acid, alkali, and saline solutions, the maximum loss of membrane mass was only 1.20% and it remained underwater oleophobic, displaying excellent chemical stability. The separation efficiency of the silica nanorods modified fiber membrane for oil-in-water emulsions was as high as 96%, and the separation flux was above 1900 L m−2 h−1·bar−1. The separation efficiency of the membranes was consistently maintained above 96% for 5 cycles.

Preparation of CuO nanorods for lithium-ion battery anodes by supercritical hydrothermal reaction of spent acidic etchant

An economical and environmentally friendly treatment method is urgently needed for the copper-containing spent acidic etchant produced by printed circuit boards. In this work, CuO nanorods with ~30 nm in diameter and ~100 nm in length were prepared from spent acidic etchant by supercritical hydrothermal synthesis. The structures and morphologies of spent acidic etchant-derived CuO (E-CuO) and analytical pure CuCl2-derived CuO (P-CuO) were characterized. The E-CuO has more impurities such as Fe and Zn than the P-CuO. The energy storage performance of the prepared CuO anodes was tested. The E-CuO delivers a high initial discharge capacity of 793.3 mAh·g−1 and a better rate and cycling performance than the P-CuO due to the smaller particles and the doping of Fe and Zn from the spent acidic etchant in the E-CuO.

Preparation and characterization of SbAs nanorods for opto-electronics applications

Preparation and characterization of SbAs nanorods for opto-electronics applications

Fine control for the preparation of ceria nanorods (111).

The morphologies and exposed surfaces of ceria nanocrystals are important factors in determining their performance. In order to establish a structure-property relationship for ceria nanomaterials, it is essential to have materials with well-defined morphologies and specific exposed facets. This is also crucial for acquiring high resolution 17O solid-state NMR spectra. In this study, we explore the synthesis conditions for preparing CeO2 nanorods with exposed (111) facets. The effects of alkali concentration, hydrothermal temperature and time, cerium source and oxidation agent are investigated and optimal synthesis conditions are found. The resulting CeO2 nanorods show very narrow 17O NMR peaks for the oxygen ions in the first, second and third layers, providing a foundation for future research on mechanisms involving ceria materials using 17O solid-state NMR spectroscopy.

Controlled preparation of CoNi2S4 nanorods derived from MOF-74 nanoarrays involving an exchange reaction for high energy density supercapacitors.

Binary transition metal sulfides are considered to be a promising material for supercapacitors, possessing richer electrochemically active sites and superior electrochemical performance. Metal-organic frameworks (MOFs) are often used as self-sacrificing templates in the preparation of metal sulfides. Usually, direct sulfidation of MOFs tends to cause collapse of the morphological structure and blockage of the ion transport channels, so that the morphology of the original MOF template can be well preserved by using pyrolysis followed by S2- ion exchange. In this paper, we first prepared NiCo-MOF-74 on nickel foam by an in situ transformation method from layered double hydroxides (LDHs) through a ligand exchange reaction. Then, CoNi2S4 was synthesized in two steps involving the pyrolysis of NiCo-MOF-74 and a subsequent S2- ion exchange reaction. Compared with direct sulfidation, this synthetic strategy can well maintain the rod-like morphology of MOF-74 arrays and prevent structural collapse. The surface of CoNi2S4 has a fine nanosheet structure, which exposes more active sites and shows a high specific capacitance of 7.50 F cm-2 at 2 mA cm-2 and an excellent Coulomb efficiency (96.32%). In addition, the hybrid supercapacitor assembled with activated carbon shows a high energy density of 0.64 mW h cm-2 at a power density of 1.64 mW cm-2 and a high capacitance retention of 88.39% after 5000 cycles. These results indicate that rod-shaped CoNi2S4 can be controllably prepared from MOF-74 involving an exchange reaction and has promising application in high-performance supercapacitors.

Controlled synthesis of monodisperse gold nanorods with a small diameter of around 10 nm and largest plasmon wavelength of 1200 nm.

Gold nanorods have been widely used in various fields due to their tunable anisotropic localized surface plasmon resonance (SPR) property. The facile preparation of gold nanorods with a tunable SPR wavelength extending to a near-infrared window, and at the same time, a relatively small particle size for facilitating applications especially in the biomedical field is of great value yet highly challenging. In this work, a new reducing agent, 1,6-dihydroxynaphthalene, is proposed for the synthesis of gold nanorods. The results indicate that gold nanorods with good monodispersity, high shape yield, maximum SPR wavelength of 1200 nm, and especially small diameter of around 10 nm can be acquired simultaneously. In terms of spectral and size controls, by respectively varying the experimental parameters including the amount of silver ions, reducing agents, and gold seeds not only can a good linear correlation be acquired corresponding to a SPR wavelength ranging from around 600 nm to 1200 nm, but a regular change in the particle diameter from 10.5 nm to 7.5 nm could also be observed. The structural and morphological evolutions of the particle for each changed parameter were carefully studied, and insights were gained into the growth mechanism based on the detailed analysis of particle evolution at a specific stage of the growth process.

Promoting the humidity sensing capabilities of titania nanorods/rGO nanocomposite via de-bundling and maximizing porosity and surface area through lyophilization

Herein, the preparation of titania nanorods with reduced graphene oxide nanocomposite is introduced using a combination of the simple hydrothermal process and co-precipitation followed by freeze-drying. The preceding nanocomposite is functioned as a humidity sensor to detect the surrounding moisture levels. The XRD results reveal the confirmed incorporation of titania nanotubes onto the reduced graphene oxide sheets. The STEM and HRTEM consequences support the XRD structural results. Raman and FTIR bands reveal the disappearing significance of D and G bands for reduced graphene oxide. BET assessment study demonstrates the resultant maximized pores size accompanied by raised overall exposed surface area. The humidity sensing measurements within a broad spectrum of surrounding humidity (11%–97%) disclose a decent response and recovery times of 40 s and 166 s consecutively. Successful exposure to freeze-drying promotes the stabilized and enlarged surface area accompanied by the hindering of the realized hydrophobicity of the titania which opposes the humidity sensing application. The simple route of humidity sensing for this nanocomposite delivers a superior message to the humidity sensing applications over a wide range of areas. • Freeze-drying could deliver highly stable, porous, and suitable composites recommended for humidity sensing applications • The pores' size and the surface area of the resultant titania nanorods/ reduced graphene oxide (TNR/rGO) nanocomposite were maximized throughout the lyophilization process also the humidity sensing performance enhanced.

Preparation of N-doped MoP-based core-shell nanorods and their electrocatalytic performance in hydrogen evolution

N-doped MoP-based core-shell nanorods (N-MoP/NC-8) were synthesized by in-situ phosphorization of molybdenum trioxide-ethylenediamine organic-inorganic hybrid material (MoO3/EDA) via a gas-solid reaction; their electrocatalytic performance in hydrogen evolution was investigated. The results indicate that N-MoP/NC-8 is composed of N-doped molybdenum phosphide (MoP) coated by N-doped carbon layer. The introduced electronegative atom can regulate the electronic structure of the active phase, whilst the combination of carbon layer and MoP can inhibit the internal agglomeration of MoP, resulting in large pore volume and surface area. Owing to such a dual effect, the N-MoP/NC-8 catalyst shows excellent performance in electrocatalytic hydrogen evolution and great charge transfer ability; the overpotential is 92 mV at 10 mA/cm2 current density in 0.5 mol/L H2SO4 solution, with a Tafel slope of 68 mV/dec and a durability of above 20 h.

Preparation of TiN nanorods for SERS substrate by controlling pulse frequency of high power impulse magnetron sputtering

The surface-enhanced Raman scattering (SERS) substrate was fabricated using titanium nitride nanorods structures (TiN NRs) which were prepared by the combination of high-power impulse magnetron sputtering (HiPIMS) and glancing angle depositions (GLAD) techniques. The surface morphology, crystalline structures and chemical composition of TiN NRs were characterized by field-emission scanning electron microscopy (FE-SEM), grazing incidence X-ray diffraction (GIXRD) and X-ray photoelectron spectroscopy, (XPS) respectively. Additionally, a portable Raman spectroscopy at 532 nm was used to inspect the performance of Raman signal enhancement. The cubic phase of TiN NRs was shown on (111), (200) and (220) planes. The efficiency of the generated Raman signal of Rhodamine 6 G be measured at a detection limit of 10–6 M with a long shelf-life of TiN NR SERS of more than 28 days. According to the experimental results, TiN NRs are a promising candidate for SERS substrates fabricated cost effectively.

Novel Nanoarchitectured Cu2Te as a Photocathodes for Photoelectrochemical Water Splitting Applications.

Designing photocathodes with nanostructures has been considered a promising way to improve the photoelectrochemical (PEC) water splitting activity. Cu2Te is one of the promising semiconducting materials for photoelectrochemical water splitting, the performance of Cu2Te photocathodes remains poor. In this work, we report the preparation of Cu2Te nanorods (NRs) and vertical nanosheets (NSs) assembled film on Cu foil through a vapor phase epitaxy (VPE) technique. The obtained nano architectures as photocathodes toward photoelectrochemical (PEC) performance was tested afterwards for the first time. Optimized Cu2Te NRs and NSs photocathodes showed significant photocurrent density up to 0.53 mA cm−2 and excellent stability under illumination. Electrochemical impedance spectroscopy and Mott–Schottky analysis were used to analyze in more detail the performance of Cu2Te NRs and NSs photocathodes. From these analyses, we propose that Cu2Te NRs and NSs photocathodes are potential candidate materials for use in solar water splitting.

A facile and energy-saving preparation of α-ZnMoO4 nanorods for enhanced Li-ion intercalation application

In this paper, one-dimensional α-ZnMoO4 nanorods with diameter of 30–50 nm have been prepared by a facile chemical precipitate reaction. This route is facile, energy-saving, no required special equipment and suitable for scalable synthesis. Transmission electron microscopy and fast Fourier transform pattern illustrate that the nanorods grow along the [011] crystal plane. When used as anode of lithium-half cell, the as-synthesized α-ZnMoO4 nanorods deliver a high capacity of about 417.6 mAh g−1 after 800 cycles at the current density of 0.2 A g−1, an excellent rate (140 mAh g−1 even at 2.0 A g−1) and fast lithium-ion diffusion coefficient (2.29 × 10−17 cm2 s−1), which is superior to that of the bulk counter and the previously reported. Such remarkable electrochemical performance is probably attributed to the favorable nanorods characteristic.