Study of Optical and Electrical Properties of Graphene Oxide

Neeraj, S.; Tomar, Sanjeev; Shkir, Mohd.; Choubey, Ravi Kant; Singh, Arun

doi:10.1016/j.matpr.2020.04.861

Cited by 21 publications

(13 citation statements)

References 20 publications

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“…Since the amount of E g has been estimated before (= 1.3 eV), the valence band energy is equal to −5.1 eV (figure 1(f)). These energy levels are in accordance with the other GO based studies [29,31].…”

Section: Go Paper Characterizationsupporting

confidence: 93%

Self-powered ultraviolet/visible photodetector based on graphene-oxide via triboelectric nanogenerators performing by finger tapping

et al. 2022

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Self-sufficient power sources provide a promising application of abundant electronic devices utilized in detection of ambient properties. Recently, triboelectric nanogenerators (TENGs) have been widely investigated to broaden the self-powered systems by converting the ambient mechanical agitations into electrical voltage and current. Graphene oxide (GO), not only for sensing applications but also as a brilliant energy-related nanomaterial, provides a wide range of controllable bandgap energies, as well as facile synthesis route. In this study, GO-based self-powered photodetectors have been fabricated by conflating the photosensitivity and triboelectric characteristics of freestanding GO paper. In this regard, photodetection via TENGs has been investigated in two forms of active and passive circuits for ultraviolet (UV) and visible illumination. The photodetector responsivity upon UV enhanced from 0.011 mA/W for conventional GO-photoresistors up to 13.41 mA/W by active photodetection setup. Moreover, applying the active-TENG improved the efficiency from 0.25% (in passive TENG) to 4.21%. Our findings demonstrate that active TENGs might enable materials with insignificant optical response to represent considerably higher light-sensitivity by means of synergizing the effect of TENG output changes with opto-electronical properties of desired layers.

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Section: Go Paper Characterizationsupporting

confidence: 93%

Self-powered ultraviolet/visible photodetector based on graphene-oxide via triboelectric nanogenerators performing by finger tapping

et al. 2022

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“…Both the restriction of mobility and shorter distances to the aromatic rings are expected to decrease chemical shift values due to the ring current effect. Thus, the relative changes in 1 H NMR chemical shifts agree with the structural model in which the C 11 H 22 fragment in (3) is bent over the graphene matrix (see conformation 6 in Figure 9).…”

Section: ■ Results and Discussionsupporting

confidence: 75%

“…Graphite, diamonds, fullerenes are naturally occurring allotropes of carbon. Graphite is one of the main precursors for the synthesis of graphene oxide and reduction of graphene oxide can give graphene like structures. , The oxidation of graphene may occur by the excitation of the π-electrons along with oxide functional groups that share the π-electrons to form sp 3 hybridization for graphene oxide material . The widely known Hummers’ method of oxidation has been modified and improved in several ways with respect to the conventional techniques .…”

Section: Introductionmentioning

confidence: 99%

Intramolecular Amino-thiolysis Cyclization of Graphene Oxide Modified with Sulfur Dioxide: XPS and Solid-State NMR Studies

et al. 2022

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Graphite microparticles were oxidized to graphene oxide (MPGO) by Hummers' method followed by thermal exfoliation (C/O ratio 1.53). Graphene oxide was modified with SO 2 (mMPGO) at 600 °C and by subsequent treatment at 200 °C having a sulfur content of 10.9% (C/O ratio 16.94) and manganese content 9.39 μmol•g −1 . The XPS spectrum of MPGO showed the presence of carbonyl and epoxide groups. The reactivity of mMPGO toward alkyl thiol and alkyl amine showed the same selectivity as other carbons and suggested that oxidation did not modify deeply the edging structure of graphite. Therefore, the tetradehydrogenated-benzo[α]anthracene (TBA) reactive site model is valid. From XPS and solid-state NMR, amino-thiolysis occurred via cyclization. On the basis of the joint analysis of solid-state 1 H and 13 C NMR spectra of mMPGOs treated with mono-and difunctionalized alkanes, a preferred conformation of the alicyclic moiety of aminothiol over the graphene matrix occurred via binding to mMPGO at both amine and thiol ends. It was found that paramagnetic manganese ions in mMPGO can lead to cross-polarization inefficiency in the 13 C CPMAS detection of alkyl chains bound to mMPGO, while ring currents from graphene aromatic layers can shift alkyl 1 H NMR signals to lower frequencies by up to 4 ppm.

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“…In TEM images of chlorine-doped graphene oxide, there are dark regions with low optical transmittance. 78 These images support the low optically transparent structure of heteroatom doped graphene. 74,78 Specific surface area, pore size, and pore volume of CS and Cl-GO were determined by BET analysis.…”

Section: Resultssupporting

confidence: 52%

“…78 These images support the low optically transparent structure of heteroatom doped graphene. 74,78 Specific surface area, pore size, and pore volume of CS and Cl-GO were determined by BET analysis. BET surface area of CS powder was measured as 5.98 m 2 .g −1 , and average adsorption pore width and pore volume were determined as 30.27 nm and 0.045 cm 3 .g −1 , respectively.…”

Section: Resultssupporting

confidence: 52%

Electrochemical Supercapacitor Application of Electrochemically Produced Chlorine-Doped Graphene Oxide with Cobalt Sulfide-Based Compounds Produced from Recycling of Spent Li-Ion Batteries

Yasa,

Birol,

Gencten

2024

ECS J. Solid State Sci. Technol.

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Recycling of LiCoO2 (LCO) based Li-ion batteries for energy storage systems is crucial both environmentally and economically. Reusing active species of LCO cathodes minimizes waste and conserves resources, promoting sustainability in energy storage. We have investigated repurposing cobalt from spent LiCoO2 (LCO) type Li-ion batteries into a cobalt sulfide-based compound (CS), which was then employed as an electrode material in asymmetric supercapacitors. Initially, the LCO cathode compound underwent leaching, resulting in the precipitation of CS utilizing the sulfur source derived from cobalt ions present in the solution. Furthermore, chlorine-doped graphene oxide (Cl-GO) was synthesized via the chronoamperometric method utilizing a 5 M perchloric acid solution. Produced CS and Cl-GO were characterized by using spectroscopic and microscopic techniques. The resulting CS and Cl-GO powders were combined to form the composite positive electrode of coin cell type asymmetric supercapacitors (CCTAS), with graphite powder (GP) utilized in the preparation of the negative electrode. CCTAS were also characterized by using electrochemical techniques such as cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge. The highest areal capacitance, recorded as 101 mF.cm-2 at a scan rate of 10 mV.s-1, was achieved in the CS/Cl-GO%15//GP CCTAS, with a capacitance retention of approximately 94% observed after 1000 cycles.

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Study of Optical and Electrical Properties of Graphene Oxide

Cited by 21 publications

References 20 publications

Self-powered ultraviolet/visible photodetector based on graphene-oxide via triboelectric nanogenerators performing by finger tapping

Self-powered ultraviolet/visible photodetector based on graphene-oxide via triboelectric nanogenerators performing by finger tapping

Intramolecular Amino-thiolysis Cyclization of Graphene Oxide Modified with Sulfur Dioxide: XPS and Solid-State NMR Studies

Electrochemical Supercapacitor Application of Electrochemically Produced Chlorine-Doped Graphene Oxide with Cobalt Sulfide-Based Compounds Produced from Recycling of Spent Li-Ion Batteries

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