Electrical transport properties and ultrafast optical nonlinearity of rGO–metal chalcogenide ensembles

Rahaman, Abdulla Bin; Sarkar, Anindya; Singha, Tara; Chakraborty, Koushik; Dutta, Snehasish; Pal, Tanusri; Ghosh, Surajit; Datta, Prasanta Kumar; Banerjee, Dipanwita

doi:10.1039/c9na00728h

Cited by 11 publications

(1 citation statement)

References 56 publications

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“…For the commercial diode, as temperature increases, the barrier voltage decreases, as expected in devices with p-n junctions based on semiconductors 61,62 . In the prototypes fabricated in this work, a non-linear effect was observed in the I-V curves for low temperatures up to approximately 140 K, which is consistent with previous reports by Voitsihovska et al 63 , and Rahaman et al 64 Also, for higher temperatures until 300 K, this effect disappears and an ohmic behavior is evidenced, within the foregoing range of currents, this behavior agrees with electrical linear responses for temperatures between 150 and 300 K, as reported by Abid et al 65 , Bonavolontà et al 17 , and Joung and Khondaker 38 in rGO samples. This can be explained considering that, for low temperatures, the effect of the metal-semiconductor junction between the electrical contacts and the GOF sample becomes predominant.…”

Section: Resultssupporting

confidence: 92%

Temperature dependence of electrical conductivity and variable hopping range mechanism on graphene oxide films

Sánchez-Trujillo

Osorio-Maldonado

Prías‐Barragán

2023

Sci Rep

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The rapid development of optoelectronic applications for optical-to-electrical conversion has increased the interest in graphene oxide material. Here, graphene oxide films (GOF) were used as source material in an infrared photodetector configuration and the temperature dependence of the electrical conductivity was studied. GOF were prepared by the double-thermal decomposition (DTD) method at 973 K, with a fixed carbonization temperature, in a pyrolysis system, under a controlled nitrogen atmosphere, over quartz substrates. Graphene oxide films were mechanically supported in a photodetector configuration on Bakelite substrates and electrically contacted with copper wires and high-purity silver paint. Morphological images from the GOF’s surface were taken employing a scanning electron microscope and observed a homogeneous surface which favored the electrical contacts deposition. Vibrational characteristics were studied employing Raman spectroscopy and determined the typical graphene oxide bands. GOF were used to discuss the effect of temperature on the film’s electrical conductivity. Current–voltage (I–V) curves were taken for several temperatures varying from 20 to 300 K and the electrical resistance values were obtained from 142.86 to 2.14 kΩ. The GOF electrical conductivity and bandgap energy (Eg) were calculated, and it was found that when increasing temperature, the electrical conductivity increased from 30.33 to 2023.97 S/m, similar to a semiconductor material, and Eg shows a nonlinear change from 0.33 to 0.12 eV, with the increasing temperature. Conduction mechanism was described mainly by three-dimensional variable range hopping (3D VRH). Additionally, measurements of voltage and electrical resistance, as a function of wavelength were considered, for a spectral range between 1300 and 3000 nm. It was evidenced that as the wavelength becomes longer, a greater number of free electrons are generated, which contributes to the electrical current. The external quantum efficiency (EQE) was determined for this proposed photodetector prototype, obtaining a value of 40%, similar to those reported for commercial semiconductor photodetectors. This study provides a groundwork for further development of graphene oxide films with high conductivity in large-scale preparation.

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Section: Resultssupporting

confidence: 92%

Temperature dependence of electrical conductivity and variable hopping range mechanism on graphene oxide films

Sánchez-Trujillo

Osorio-Maldonado

Prías‐Barragán

2023

Sci Rep

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On the Rapid Synthesis of Reduced Graphene Oxide via Ultrasound‐Promoted Eco‐Friendly Reduction Approach and Its Effects on Physicochemical Properties

Lam,

Wang,

Yeap

et al. 2024

ChemSusChem

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The common synthesis approach of reduced graphene oxide (rGO) using toxic reducing agents poses a threat to environmental pollution. This study used banana peel extract as a green reducing agent for the synthesis of rGO. Ultrasonication was assimilated to expedite the synthesis process. For comparison, rGO was also produced by reducing GO with hydrazine treatment under conventional stirring. Both morphological (SEM) and physicochemical (FTIR and XRD) studies have revealed that banana peel extract can reduce GO to rGO, although its reducing effect is much weaker compared to hydrazine. Despite this, the rGO produced using banana peel extract with the assimilation of ultrasonication technique has a greater interlayer spacing than that formed under the conventional stirring method. In terms of electrical properties, the electrical conductance of hydrazine‐produced rGO (5.69 × 10‐6 S) is higher than the banana peel extract‐produced rGO (3.55 × 10‐6 S ‐ 4.56 × 10‐6 S). Interestingly, it was found that most of the rGO produced by banana peel extract under ultrasound assistance has higher or comparable electrical conductance compared to the rGO produced by banana peel extract under stirring method. This implies the feasibility of using short‐period ultrasound to replace conventional stirring in rGO synthesis.

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Hydrogen peroxide–assisted photocatalytic dye degradation over reduced graphene oxide integrated ZnCr2O4 nanoparticles

Tantubay

Das

Baskey

2021

Environ Sci Pollut Res

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Zinc chromite nanoparticles (NPs) and zinc chromite-reduced graphene oxide (ZnCr 2 O 4 -rGO) nanocomposite have been synthesized by the combined effect of re ux condensation and calcination process. The structural properties were characterised by X-ray diffraction (XRD), Fourier transform infrared (FTIR), UV-visible studies etc. Structural morphology was investigated by eld emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) that indicates the formation of particles in nanometre regime. The catalytic effects of synthesized materials were studied in presence of visible light assisted by hydrogen peroxide (H 2 O 2 ) and they show excellent photo activity which supports the band gap value and photoluminescence outcome. The presence of the elements Zn, Cr, O and C has been con rmed by Energy dispersive X-ray spectroscopy (EDX) images which show the purity of the synthesized products.

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Electrical transport properties and ultrafast optical nonlinearity of rGO–metal chalcogenide ensembles

Abstract: Photosensitive hybrid composites (rGO–ZnSe and rGO–ZnTe) have been synthesized by a solvothermal method. Comparative study on change in mobility (dark to illumination), photosensitivity and nonlinear optical properties indicate that rGO–ZnTe performs better than rGO–ZnSe.

Cited by 11 publications

References 56 publications

Temperature dependence of electrical conductivity and variable hopping range mechanism on graphene oxide films

Temperature dependence of electrical conductivity and variable hopping range mechanism on graphene oxide films

On the Rapid Synthesis of Reduced Graphene Oxide via Ultrasound‐Promoted Eco‐Friendly Reduction Approach and Its Effects on Physicochemical Properties

Hydrogen peroxide–assisted photocatalytic dye degradation over reduced graphene oxide integrated ZnCr2O4 nanoparticles

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