Graphene Metal Research Articles

Optical and gas sensing properties of TiO2/RGO for methanol, ethanol and acetone vapors

• Preparation of TiO 2 /RGO nanocomposite by annealing method at 180 °C. • Employing TiO 2 /RGO nanocomposite toward sensing methanol, ethanol and acetone vapors with different ppm. • Observation an excellent response for ethanol detection even in low gas volume. Reduced graphene oxide and metal oxides derivatives are introduced as relatively benign materials for improving gas sensors' performance as exemplified by the synthesis of TiO 2 /GO nanocomposite via ultrasonication, and then the assembly of RGO adorning TiO 2 nanoparticles (NPs) (TiO 2 /RGO) is accomplished using the thermal annealing method. The characterization of the as-fabricated sample indicated that irregular shaped TiO 2 NPs with size of 26 nm covered the RGO nanosheets. The optical band gap measurement indicated the values of 3.19, 2.1 and 2.5 eV for TiO 2 , GO and TiO 2 /RGO samples, respectively. The ensued nanocomposites are then deployed for the gas sensing response of three common organic vapors of ethanol, methanol, and acetone with concentrations of 20, 40, 60, 80, 100 ppm, at ambient temperature. The TiO 2 /RGO sensor relatively exhibited an excellent response (3–4 times) for ethanol detection. These results indicated that the application of TiO 2 /RGO can help assist in the evolvement of portable gas sensing devices endowed with the capability to detect common place organic vapors.

Investigation and understanding of the mechanical properties of MXene by high-throughput computations and interpretable machine learning

2D transition metal carbides, nitrides, and carbonitrides (MXenes) have become prominent in energy storage, catalysis, environmental and nanoelectronics applications. In addition to their outstanding merits of electrical conductivity and electrochemically activity, the mechanical properties play crucial roles in all these applications but are usually ignored by researchers. Only quite a few publications have studied their mechanical properties and these studies still only represent a limited range of predictions compared to the large family of MXenes. Utilizing high-throughput computations and data-driven methods, this work studies the tensile stiffness (E2D) and strength (σs) of 157 types of MXenes that could be potentially fabricated. We find MXenes with the tensile stiffness ranging from 81.71 to 561.4 N/m, while 42 structures show higher stiffness than the well-known graphene and transition metal dichalcogenide (TMDs) monolayers. The E2D strongly depends on the thickness, bond strength and surface terminations. Surprisingly, we find that the surface terminations can significantly improve the E2D, and the improvement can reach nearly 100%. By using the recently developed interpretable machine learning method, we obtain the analytical formula of E2D with efficient and physically interpretable descriptors that can predict the stiffness accurately. As for the σs, it significantly scales with E2D (σs≈E2D/β, β=10.449), and can be also improved by surface terminations as well as E2D. In addition, we also find a few of MXene semiconductors, although most of MXenes are metals. Moreover, the mechanical properties of these MXenes are better than the widely used monolayer semiconductor TMDs. These MXenes semiconductors with a moderate band gap may open a new avenue for fabricating next-generation 2D nanoscale electronics, such as all-in-one monolayer devices.

Tunable metamaterial absorber based on VO2-graphene

In this paper, a tunable multilayer metamaterial absorber is proposed, which is composed of VO2-graphene mixed structure layer, PDMS dielectric layer, VO2 layer, PDMS dielectric layer and bottom metal film layer. The simulation results show that when VO2 is in the insulating phase and the Fermi level of graphene is 0.9 eV, the absorption peak of 0.75–1.15 THz is generated by the interaction resonance of graphene and bottom metal. When VO2 is in metal phase and the Fermi level of graphene is 0 eV, the absorption peak of 2.5–4.5 THz is generated by the resonance of vanadium dioxide. Therefore, the tunable switching between two different frequency bands can be realized. Moreover, the dual regulation of both vanadium dioxide conductivity and graphene Fermi energy level can also modulate the absorption amplitude and broaden absorption band. In order to explain the mechanism of VO2-graphene on the absorption performance, the electric field distribution and equivalent impedance of the absorber are discussed and analyzed in this paper. In addition, the absorption performances at variable incidence angles for both TE and TM polarizations are investigated and the absorber is insensitive to polarization. Therefore, the absorber has potential application value in the terahertz field.

Bifunctional Monolayer WSe2/Graphene Self-Stitching Heterojunction Microreactors for Efficient Overall Water Splitting in Neutral Medium.

Developing efficient bifunctional electrocatalysts in neutral media to avoid the deterioration of electrodes or catalysts under harsh environments has become the ultimate goal in electrochemical water splitting. This work demonstrates the fabrication of an on-chip bifunctional two-dimensional (2D) monolayer (ML) WSe2/graphene heterojunction microreactor for efficient overall water splitting in a neutral medium (pH = 7). Through the synergistic atomic growth of the metallic Cr dopant and graphene stitching contact on the 2D ML WSe2, the bifunctional WSe2/graphene heterojunction microreactor consisting of a full-cell configuration demonstrates excellent performance for overall water splitting in a neutral medium. Atomic doping of metallic Cr atoms onto the 2D ML WSe2 effectively facilitates the charge transfer at the solid-liquid interface. In addition, the direct growth of the self-stitching graphene contact with the 2D WSe2 catalyst largely reduces the contact resistance of the microreactor and further improves the overall water splitting efficiency. A significant reduction of the overpotential of nearly 1000 mV at 10 mA cm-2 at the Cr-doped WSe2/graphene heterojunction microreactor compared to the ML pristine WSe2 counterpart is achieved. The bifunctional WSe2/graphene self-stitching heterojunction microreactor is an ideal platform to investigate the fundamental mechanism of emerging bifunctional 2D catalysts for overall water splitting in a neutral medium.

Density functional theory study on effects of defects on metallicity in graphene nanoribbon

Based on the first principles calculation, we studied the influence of single vacancy defects on the metallicity of metal graphene nanoribbons. The studies show that the metal bandwidth of the metal GNR is about five times that of the intrinsic GNR after the introduction of zero mode. The single vacancy defect is an effective strategy to modulate the metallicity of GNR, of which the metal bandwidth can be changed in the range of 27.81 meV–965.87 meV. The ability to modulate the metallicity with the defects at the edge of the GNR is better than that inside the GNR. The metal bandwidth is inversely proportional to the locality of the wave peaks at the Fermi level.

Class of distorted Landau levels and Hall phases in a two-dimensional electron gas subject to an inhomogeneous magnetic field

An analytic closed form solution is derived for the bound states of a two-dimensional electron gas subject to a static, inhomogeneous ($1/r$ in plane decaying) magnetic field, including the Zeeman interaction. The solution provides access to many-body properties of a two-dimensional, noninteracting, electron gas in the thermodynamic limit. Radially distorted Landau levels can be identified as well as magnetic field induced density and current oscillations close to the magnetic impurity. These radially localized oscillations depend strongly on the coupling of the spin to the magnetic field, which gives rise to nontrivial spin currents. Moreover, the Zeeman interaction introduces a unique flat band, i.e., infinitely degenerate energy level in the ground state, assuming a spin ${g}_{s}$-factor of two. Surprisingly, the charge and current densities can be computed analytically for this fully filled flat band in the thermodynamic limit. Numerical calculations show that the total magnetic response of the electron gas remains diamagnetic (similar to Landau levels) independent of the Fermi energy. However, the contribution of certain, infinitely degenerate energy levels may become paramagnetic. Furthermore, numerical computations of the Hall conductivity reveal asymptotic properties of the electron gas, which are driven by the anisotropy of the vector potential instead of the magnetic field, i.e., become independent of spin. Eventually, the distorted Landau levels give rise to negative and positive Hall conductivity phases, with sharp transitions at specific Fermi energies. Overall, our work merges ``impurity'' with Landau-level physics, which provides novel physical insights, not only locally, but also in the asymptotic limit. This paves the way for a large number of future theoretical as well as experimental investigations, e.g., to include electronic correlations and to investigate two-dimensional systems such as graphene or transition metal dichalcogenides under the influence of inhomogeneous magnetic fields.

An electrochemical sensor employing β-cyclodextrin chiral cross-linked metal organic framework and graphene oxide for chiral enantiomer recognition

Chirality is a universal feature of nature, and the effective differentiation of chiral molecules is still a challenge. Here we propose a method for recognizing chiral molecules based on an electrochemical detection method. We use β-cyclodextrin as an organic ligand and coordinate it with K ions to form a metal–organic framework (MOF), then we use diphenyl carbonate to connect MOFs to obtain chiral Cross-Linked MOF (CLMOF). This CLMOF is different from the cyclodextrin MOFs reported in previous literature in that it can maintain a stable structure in the aqueous environment. CLMOF and graphene oxide (GO) are jointly modified on the glassy carbon electrode (GCE) surface to build a GO-CLMOF/GCE electrochemical sensor which is used for the chiral recognition of the enantiomers of mandelic acid (MA). The DL enantiomers of MA exhibit different electrochemical behaviors on the GO-CLMOF/GCE sensor. Their peak current ratio (IL/ID) reaches 1.8, and the peak potential difference ΔE (ED-EL) is 96 mV. It shows good linearity in the range of 0.5–30 mM. The detection limits of D-MA and L-MA are 0.15 mM and 0.09 mM, respectively. The method was successfully applied to the detection of DL-MA enantiomer of unknown concentration in urine. The recognition of DL enantiomers on the electrode surface is possible because DL-MA forms diastereomers with CLMOF. The electrochemical sensor made of CLMOF and GO is simple to prepare and has excellent selectivity for DL enantiomers of MA, and provides a possible idea for the identification and quantification of chiral isomers.

Engineering a hierarchical carbon supported magnetite nanoparticles composite from metal organic framework and graphene oxide for lithium-ion storage

Fe based metal organic framework (MOF) materials are being extensively investigated as a precursor sample for engineering carbon supported iron containing nanoparticles composites. Rational design and engineering Fe-containing MOFs with optimized structures using economic and eco-friendly methods is a challenging task. In this work, 1,3,5-benzenetricarboxylic acid (C9H6O6, trimesic acid, H3BTC) and metal Fe are employed to synthesize a MOF sample Fe-BTC in a mild hydrothermal condition. Moreover, with the addition of a small quantity of graphene oxide (GO) as dispersant, a redox coprecipitation reaction has taken place where small Fe-BTC domains well dispersed by reduced graphene oxide (RGO). The Fe-BTC/RGO intermediate sample is finally converted to the hierarchical Fe3O4@C/RGO composite, which delivers an ultrahigh specific capacity of 1262.61 mAh·g−1 at 200 mA·g−1 after 150 cycles and a superior reversible capacity of 910.65 mAh·g−1 at 1000 mA·g−1 after 300 cycles in half cells. The full cell performance for the Fe3O4@C/RGO composite have been studied. It is also revealed that the improved structural stability, high pseudocapacitive contribution and enhanced lithium-ion and electron transportation conditions jointly guarantee the outstanding lithium-ion storage performances for the Fe3O4@C/RGO composite over long-time cycling. The synthesized samples have good potential for wider application.

Tracing pictogram-level chlorothalonil pesticide based on terahertz metal–graphene hybrid metasensors

A metal–graphene hybrid metasensor in the terahertz (THz) regime has been proposed and experimentally demonstrated for the detection of pictogram-level chlorothalonil solution. Due to Fermi level of graphene tuned by the drip-dried pesticide at different concentrations, the reflective THz intensity could be modulated both in temporal and spectral domain. Furthermore, the designed metamaterial structure support the excitation of toroidal dipole mode at the resonant frequency. These characteristics enable a detection limit down to 100 pg mL−1. Hence, metal–graphene​ hybrid metamaterial in conjunction with the toroidal dipole resonance paves new way toward developing ultrasensitive THz sensors, which is promising for various applications in environmental monitoring and food safety.

Actively Controllable Terahertz Metal-Graphene Metamaterial Based on Electromagnetically Induced Transparency Effect.

A metal–graphene metamaterial device exhibiting a tunable, electromagnetically induced transparency (EIT) spectral response at terahertz frequencies is investigated. The metamaterial structure is composed of a strip and a ring resonator, which serve as the bright and dark mode to induce the EIT effect. By employing the variable conductivity of graphene to dampen the dark resonator, the response frequency of the device shifts dynamically over 100 GHz, which satisfies the convenient post-fabrication tunability requirement. The slow-light behavior of the proposed device is also analyzed with the maximum group delay of 1.2 ps. The sensing performance is lastly studied and the sensitivity can reach up to 100 GHz/(RIU), with a figure of merit (FOM) value exceeding 4 . Therefore, the graphene-based metamaterial provides a new miniaturized platform to facilitate the development of terahertz modulators, sensors, and slow-light applications.

Materials Perspectives of Integrated Plasmonic Biosensors

With the growing need for portable, compact, low-cost, and efficient biosensors, plasmonic materials hold the promise to meet this need owing to their label-free sensitivity and deep light–matter interaction that can go beyond the diffraction limit of light. In this review, we shed light on the main physical aspects of plasmonic interactions, highlight mainstream and future plasmonic materials including their merits and shortcomings, describe the backbone substrates for building plasmonic biosensors, and conclude with a brief discussion of the factors affecting plasmonic biosensing mechanisms. To do so, we first observe that 2D materials such as graphene and transition metal dichalcogenides play a major role in enhancing the sensitivity of nanoparticle-based plasmonic biosensors. Then, we identify that titanium nitride is a promising candidate for integrated applications with performance comparable to that of gold. Our study highlights the emerging role of polymer substrates in the design of future wearable and point-of-care devices. Finally, we summarize some technical and economic challenges that should be addressed for the mass adoption of plasmonic biosensors. We believe this review will be a guide in advancing the implementation of plasmonics-based integrated biosensors.

A hybrid electrocatalyst derived from Co-MOF by doping molybdenum for efficient hydrogen generation

The synergistic effect of graphene and doping elements is vital to improve the electrocatalytic performance. However, it is still a challenge to select appropriate elements for doping to improve the rate of hydrogen evolution reaction (HER). In this study, we prepared a highly efficient and promising electrocatalyst, namely CoMoO4/Co2Mo3O8@C, by a carburization process of metal–organic frameworks (MOFs) combined with doping molybdenum via simple hydrothermal and pyrolysis method. Compared with Co-MOF, CoMoO4/Co2Mo3O8@C exhibited excellent electrocatalytic performance with an overpotential as low as 120 mV at 10 mA·cm−2 and a Tafel slope as small as 69 mV·dec−1 for HER activity in 0.5 M H2SO4. The excellent performance of CoMoO4/Co2Mo3O8@C could be ascribed to the synergistic effect of CoMoO4/Co2Mo3O8 and graphene coating, which facilitated charge transfer in HER activity. This work may provide novel perspectives for fabricating electrocatalysts composed of transition metal oxide and graphene based on MOFs for enhancing HER performance.

Ferromagnetism modulation by ultralow current in a two-dimensional polycrystalline molybdenum disulphide atomic layered structure

Layered materials, such as graphene and transition metal dichalcogenides, are able to obtain new properties and functions through the modification of their crystal arrangements. In particular, ferromagnetism in polycrystalline MoS2 is of great interest because the corresponding nonmagnetic single crystals exhibit spontaneous spin splitting only through the formation of grain boundaries. However, no one has reported direct evidence of this unique phenomenon thus far. Herein, we demonstrate ferromagnetism modulation by an ultralow current density < 103 A/cm2 in 7.5-nm-thick polycrystalline MoS2, in which magnetoresistance shows three patterns according to the current intensity: wide dip, nondip and narrow dip structures. Since magnetoresistance occurs because of the interaction between the current of 4d electrons in the bulk and localized 4d spins in grain boundaries, this result provides evidence of the current modulation of ferromagnetism induced by grain boundaries. Our findings pave the way for the investigation of a novel method of magnetization switching with low power consumption for magnetic random access memories.

Phase regulation of WO3 for highly selective oxygen reduction to hydrogen peroxide

Hydrogen peroxide (H2O2), as one of the most important chemicals, is widely applied in many industries. Electrocatalytic oxygen reduction provides a safe and on-site method for H2O2 synthesis. The research of transition metal oxides (TMOs) for H2O2 synthesis is mainly focused on the modification of transition metal elements and graphene. Few studies directly control pure TMOs without changing supporting materials or introducing other elements. Here, we demonstrate for the first time a phase regulation strategy to develop highly selective and stable tungsten trioxide catalysts for H2O2 generation through 2e− oxygen reduction reaction (2e− ORR). DFT calculations show that the kinetic energy barrier (0.08 eV) of the 2e− ORR pathway on the cubic tungsten trioxide (c-WO3) surface is much lower than that of the 4e− ORR pathway (0.76 eV). As a result, a selectivity of 90 % and H2O2 production rate of 179 mmol gcat−1h−1 are achieved at 0.1 V vs RHE under alkaline conditions, outperforming all catalysts previously reported under the same conditions. Moreover, after continuous testing for more than 24 h at a constant potential of 0.1 V vs RHE, the H2O2 generation rate has not been diminished, indicating an excellent stability of c-WO3 in practical applications.

Sp-D Orbital Hybridization Driven Metal-Graphene Catalysts for Electrochemical CO2 Reduction to Formic Acid

The efficient transformation of readily-available CO2 into renewable energy sources is a crucial for the decarbonization. Formic acid (FA), the simplest combination of hydrogen and CO2, is one of the most promising hydrogen storage compounds for its high hydrogen density, non-toxicity, and great stability under ambient temperature and pressure. However, thermochemical conversion of CO2 to FA on the noble metal and metal alloy catalysts has been a challenge for a decade since the reaction is thermodynamically unfavorable and kinetically difficult due to the nature of relatively weak adsorption of CO2 on the metal surfaces in comparison to HCOO, and thus requires very high pressure/temperature. Electrochemical conversion of CO2 on the conventional carbon black supported noble metal and metal alloy catalysts, in contrast, operates at ambient conditions, but suffer low stability through dissolution and agglomeration, and requires high overpotentials to overcome a competitive hydrogen evolution reaction (HER). In this context, we investigate a highly active and stable electrocatalyst obtained by depositing transition metal monolayer on graphene (M/Gr) using DFT method, with several experimental whenever tractable. It is found that the hybridization of sp and d orbitals between graphene and metal significantly reduces the local density of states of d-band of metals and increases s-and p-orbital of graphene near the fermi level at the same time, which leads to a strong covalent bonding between metal monolayer and graphene. The covalent bonding manifests in an epitaxial-like metal growth on Gr, which has been experimentally observed for Pt/Gr, Au/Gr and Pd/Gr systems. The calculation of the orbital-resolved density of states for d band of M specifically reveals that sharp dz 2, dyz, and dxz orbital peaks below the fermi level play a decisive role in the formation of covalent bonding between M and Gr. In addition, it is found that the charge polarization on graphene in Pt/Gr and Pd/Gr not only enables a deposition of another metallic monolayer on the graphene, thus forming Pt/Gr/M or Pd/Gr/M sandwich structures, but also induces a transition from physisorption to chemisorption for M = Ag, Au, and Cu cases. Finally, by evaluating the overpotentials required for CO2 reduction to FA, it is discovered that, among M/Gr, Pt/Gr/M, and Pd/Gr/M electrocatalysts, Ni/Gr, Pd/Gr, Pt/Gr/Ag, and Pt/Gr have excellent activity and selectivity toward electrosynthesis of FA.

Graphene oxide nanofiltration membranes with confined Na+ in two-dimensional nanochannels

The interactions between metal cations and graphene derivatives may bring about significant changes to the properties and structures of graphene-based devices, which further affect their performance. Under practical pressure-driven separation conditions, the presence of metal cations in the feeding solutions is universal. They not only play the role of target solutes but also act as the modifier to tune the structure and transmembrane resistance of graphene oxide (GO) membranes. Herein, the influences of hydrated Na+/Mg2+ on the two-dimensional nanochannels of GO membranes under pressure driven conditions are revealed. Hydrated Na+ tend to be confined in between GO sheets, leading to the expansion of the nanochannels which facilitates the passage of water molecules. The accumulation of hydrated Mg2+ at the edges of GO sheets reduces both the cross-sectional area and the number of the transport pathways, increasing the transmembrane resistance of water molecules. On this basis, high flux Na+-GO nanofiltration membranes were designed, which exhibited ∼ 6 times increase in pure water flux compared with GO membranes. The water flux in dye solutions was increased by 4– 5 times without scarifying the rejection for methyl orange and direct yellow. The Na+-GO membranes showed good structural stability both in water and salt/dye solutions, confirming that the treatment with dynamic Na+ flow is a reliable strategy to improve the nanofiltration efficiency of GO membranes. It was demonstrated that hot water filtration was a simple but efficient way to recover the initial structure and performance of GO membranes.

Graphene and Liquid Metal Integrated Multifunctional Wearable Platform for Monitoring Motion and Human-Machine Interfacing.

Motion sensors are an essential component of many electronic systems. However, the development of inertial motion sensors based on fatigue-free soft proof mass has not been explored extensively in the field of soft electronics. Nontoxic gallium-based liquid metals are an emerging class of material that exhibit attractive electromechanical properties, making them excellent proof mass materials for inertial sensors. Here, we propose and demonstrate a fully soft laser-induced graphene (LIG) and liquid metal-based inertial sensor integrated with temperature, humidity, and breathing sensors. The inertial sensor design confines a graphene-coated liquid metal droplet inside a fluidic channel, rolling over LIG resistive electrode. The proposed sensor architecture and material realize a highly mobile proof mass and a vibrational space for its oscillation. The inertial sensor exhibits a high sensitivity of 6.52% m-1 s2 and excellent repeatability (over 12 500 cycles). The platform is fabricated using a scalable, rapid laser writing technique and integrated with a programmable system on a chip (PSoC) to function as a stand-alone system for real-time wireless monitoring of movement patterns and the control of a robotic arm. The developed printed inertial platform is an excellent candidate for the next-generation of wearables motion tracking platforms and soft human-machine interfaces.

Charge Injection Into Electrodeposited Cu2O From Metallic Stacks and Graphene

Cuprous oxide (Cu2O) is a promising semiconductor for photovoltaic applications owing to its direct bandgap, facile fabrication possibilities, and cost effectiveness. However, the efficiency of single photovoltaic cells employing Cu2O is limited to 3%–4% necessitating investigations into material quality and reliable interface conductivity with contact metals. In this article, we systematically investigate the charge transport efficiency between electrodeposited (ED) Cu2O thin films and commonly used metallic stack contact materials, such as Ti/Au, Cr/Au, and Pt. We further explore a large-area CVD-grown graphene monolayer as a transparent contact for Cu2O thin films. Using transfer length measurements (TLMs), we observe thermal emission characteristics with no noticeable Fermi-pinning effects using the metal combinations employed on ED Cu2O. We achieve the lowest reported contact resistivity on Cu2O thin films ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\boldsymbol {\rho }_{C}=2.15 \times 10^{-5} \Omega cm^{2}$ </tex-math></inline-formula> ) using a Ti–Au metal combination with the resistivity scaling exponentially with the barrier height on other metal stacks. In contrast, the true contact resistivity between a single monolayer of undoped graphene and a Cu2O thin film was measured to be an order of magnitude higher ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$5.526\times 10^{-4} \Omega cm^{2}$ </tex-math></inline-formula> ). Despite the higher resistance, this result indicates that further investigations into stacking multiple layers with careful doping control can make large area graphene attractive for photovoltaic applications using functional oxides.

Misfit layered compounds: Unique, tunable heterostructured materials with untapped properties

Building on discoveries in graphene and two-dimensional (2D) transition metal dichalcogenides, van der Waals (VdW) layered heterostructures—stacks of such 2D materials—are being extensively explored with resulting new discoveries of novel electronic and magnetic properties in the ultrathin limit. Here, we review a class of naturally occurring heterostructures—the so-called misfits—that combine disparate VdW layers with complex stacking. Exhibiting remarkable structural complexity and diversity of phenomena, misfits provide a platform on which to systematically explore the energetics and local bonding constraints of heterostructures and how they can be used to engineer novel quantum fabrics, electronic responsiveness, and magnetic phenomena. Like traditional classes of layered materials, they are often exfoliatable and thus also incorporatable as units in manually or robotically stacked heterostructures. Here, we review the known classes of misfit structures, the tools for their single crystal and thin film synthesis, the physical properties they exhibit, and the computational and characterization tools available to unravel their complexity. Directions for future research are also discussed.

Enhancing the optical properties of chitosan, carboxymethyl cellulose, sodium alginate modified with nano metal oxide and graphene oxide

The solution casting method was utilized to synthesize nanocomposite films of chitosan (Cs)/CuO, Cs/graphene oxide (GO), carboxymethyl cellulose (CMC)/TiO2, CMC/GO, sodium alginate (Na-Alg)/TiO2, and Na-Alg/GO owing to their various applications. The influence of CuO, TiO2 and GO concentration on the optical properties of Cs, CMC and Na-Alg films was studied by UV-Vis Spectroscopy. The absorbance of Cs, CMC and Na-Alg increased with increasing the filler's content, thus reflecting the dependence of Cs, CMC, and Na-Alg properties on the nanofiller's content, and confirming the interactions between individual polymers and CuO, TiO2 and GO nanoparticles. The obtained absorbance values were then used to calculate the absorption coefficient and, hence, the optical band gap values. The characteristic absorption bands of CuO and TiO2 underwent a redshift by increasing the filler's content. The results showed that the optical band gap of Cs, CMC, and Na-Alg decreased with filler's content, and they possessed 1, 2 and 2 band gaps respectively. The obtained results recommended that Cs, CMC, and Na-Alg nanocomposites can be used in optoelectronic devices.