A comparative study on gas-sensing behavior of reduced graphene oxide (rGO) synthesized by chemical and environment-friendly green method

Sharma, Neeru; Vyas, Rishi; Sharma, Vikas; Rahman, Habeebur; Sharma, S. K.; Sachdev, K.

doi:10.1007/s13204-019-01138-7

Cited by 27 publications

(12 citation statements)

References 57 publications

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“…Since the rGO film specimen was prepared in submicrometer 2.64 μm of thickness, the Si (400) peak appeared at 70°. 37 The broad (002) peak of rGO film was consistent with the typical shapes of XRD spectra reported in previous literature works 38,39 that explained that the broadening could originate from amorphous rGO, random picking of rGO, and removal of carboxylic acid groups by hydrazine hydrate. The XRD spectra of STG and STG-400C represent a similar broad peak near the range of 20°−30°; the crystalline spacing of STG (d 002 ) was found to vary in the range of 3.43− 4.44 Å.…”

Section: Resultssupporting

confidence: 88%

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Kim

Lee

et al. 2021

ACS Nano

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Currently, researchers are paying much attention to the development of effective 3D graphene for applications in energy storage and environmental purification. Before commercialization, however, it is necessary to develop a method that allows for the large-scale production of such materials and enables good control over their structural and chemical properties. With this objective, we herein developed a simple method for the formation of large-scale (4 in. wafer) 3D graphene networks via the self-assembly of graphene sheets at a superheated liquid−vapor interface. The structural morphology of this porous network could be modified by controlling the vaporization rate, surface temperature of the target substrate, and amount of discharged colloids. The key mechanism behind this intriguing result was investigated by high-speed visualization of microdroplet behavior and extensive thermal analysis. This self-assembled 3D graphene had excellent electrical and mechanical properties. Our approach can be directly used for the mass production of graphene-based materials.

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Section: Resultssupporting

confidence: 88%

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Kim

Lee

et al. 2021

ACS Nano

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“…rGO, achieved through different reduction procedures, has been reported as a p-type material. , Likewise, studies have shown that rGO obtained through certain methods such as low-temperature annealing has a n-type behaviour . rGO has also been reported to exhibit ambipolar behavior, that is, which undergoes easy transition from p-type to n-type behavior and vice versa based on external conditions, and this behavior has been utilized in several gas sensing applications. − Romero et al especially showed that rGO is rendered p-type solely because of adsorbed gases on the surface, much like the mechanism discussed here . The gas atoms chemisorbed on rGO, trap electrons, and lead to their depletion in the material, allowing holes to dominate the conduction.…”

Section: Results and Discussionmentioning

confidence: 99%

Broad-Range Fast Response Vacuum Pressure Sensors Based on a Graphene Nanocomposite with Hollow α-Fe₂O₃ Microspheres

Shirhatti

Nuthalapati

Kedambaimoole

et al. 2020

ACS Appl. Electron. Mater.

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This paper demonstrates the application of a graphene–ferric oxide (hollow mesoporous α-Fe2O3 microspheres) nanocomposite for the measurement of vacuum pressure. Numerous research and industrial systems essentially require a vacuum environment, and therefore, measurement of vacuum becomes vital for their efficient functioning. The presented graphene nanocomposite vacuum pressure sensor (GnVS) is fabricated using a reduced graphene oxide (rGO)/α-Fe2O3 nanocomposite synthesized by a facile and safe hydrothermal process. This sensor has an impressive operating range spanning 9 orders of magnitude down from atmospheric pressure (103 mbar) to high vacuum (∼4 × 10–6 mbar), a remarkable sensitivity of 2 × 10–4 mbar–1, and a response/recovery time of ∼3 s, which are major improvements over the reported graphene- and rGO-based vacuum sensors. The reason behind the exceptional device performance is proposed to be a coaction of gas chemisorption on sensor surface, thermal conductivity of the sensing material, and varying van der Waals force between rGO layers. The temperature dependence of the sensor has been examined, and an appropriate temperature compensation technique is suggested. GnVS promises to bring a one-step vacuum measurement solution with its high sensitivity, repeatability, broad range, simple cost-effective design, and potential to revolutionize the vacuum sensing technology.

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“…After drying, sample was collected and weighed. [26]:250mg synthesized GO was added to 200mL DI water and sonicated for 3hr. To this dispersed GO solution 20mL hydrazine hydrate solution (10mL hydrazine hydrate added to 10mL DI) was added.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of cellular structures in thermoplastic polyurethane matrix using carbonaceous nanofillers

Nair

Mandal

Roy

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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In the present study, we have synthesized, graphene oxide (GO) by using modified Hummer’s method and reduced graphene oxide(rGO) by using hydrazine hydrate as reducing agent. Since GO and rGO have high surface area and modification of surface is easier, they produce drastic changes in the matrix properties at a very low loading volume. Oxygen functionalities further allow increased interaction with polar polymer composites. Modified hummers method is the most commonly and widely used method of chemical reduction to synthesis graphene oxide as it is rapid and safe. Unlike other method, it is less hazardous and requires less reaction time. Sulfuric acid was used to disperse graphite and NaNO3 and KMNO4 as oxidizing agent. The use of KMNO4 instead of KClO3 reduced the chances of ClO2 explosion and also accelerated the reaction. Characterization of graphene oxide and reduced graphene oxide was done using XRD, SEM, FTIR, Raman spectroscopy and TGA. The synthesized GO and rGO were used as nanofillers for the synthesis of polyurethane nanocomposite. Thermoplastic polyurethane is biodegradable and thus polyurethane nanocomposites have wide application. PU nanocomposites were prepared using thermo-chemical solvent mixing method and their microstructures were investigated using various characterization techniques.

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A comparative study on gas-sensing behavior of reduced graphene oxide (rGO) synthesized by chemical and environment-friendly green method

Cited by 27 publications

References 57 publications

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Broad-Range Fast Response Vacuum Pressure Sensors Based on a Graphene Nanocomposite with Hollow α-Fe₂O₃ Microspheres

Fabrication of cellular structures in thermoplastic polyurethane matrix using carbonaceous nanofillers

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A comparative study on gas-sensing behavior of reduced graphene oxide (rGO) synthesized by chemical and environment-friendly green method

Cited by 27 publications

References 57 publications

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Advanced Boiling–A Scalable Strategy for Self-Assembled Three-Dimensional Graphene

Broad-Range Fast Response Vacuum Pressure Sensors Based on a Graphene Nanocomposite with Hollow α-Fe2O3 Microspheres

Fabrication of cellular structures in thermoplastic polyurethane matrix using carbonaceous nanofillers

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Broad-Range Fast Response Vacuum Pressure Sensors Based on a Graphene Nanocomposite with Hollow α-Fe₂O₃ Microspheres