Graphene-Oxide Nano Composites for Chemical Sensor Applications

Hazra, Surajit Kumar; Basu, S.

doi:10.3390/c2020012

Cited by 41 publications

(22 citation statements)

References 76 publications

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“…When a sensing material is exposed to air, adsorption of oxygen ions occurs at the sites of defects or functional groups on the sensing surface. They form chemisorbed oxygen species as per equations (1) and (2), by capturing free electrons from the matrix leading to reduced surface activity 36 .…”

Section: General Mechanism Of Chemiresistive Gas Sensingmentioning

confidence: 99%

Reduced graphene oxide-zinc oxide nano-composites for gas sensing applications

Gupta

2021

Advanced Materials Proceedings

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Nowadays, gas sensors are fast becoming an imperative part of modern life with extensive applications in domestic safety, environmental monitoring, industrial process control, public security, medical applications and chemical warfare assessment amongst many others. The detection of minor gas leaks has been a challenging area of research, particularly in view of the hazards to human health and safety posed by toxic gases like NO2, NO, CO, NH3 etc and combustible gases like methane, hydrogen gas and some volatile organic compounds. Thus it is imperative to evolve and employ simple yet reliable gas sensing mechanisms with optimum response and selectivity towards even low concentration of analyte gas at room temperature. Most of the conventional gas sensors are based on metal-oxide semiconductors which are low-cost, exhibit good sensitivity and fast response/recovery. Zinc oxide is one such n-type semiconducting oxide, which has been widely studied for gas sensing response due to its ease of fabrication, high sensitivity and environment-friendly nature. However, the operating temperature of such sensors is usually high (>200°C) owing to the wide band-gap (3.37 eV) and high electrical resistance (kΩ-MΩ), which limits their practical utilization. In order to be used in hazard monitoring and home/workplace safety, the gas sensors need to be sensitive to gas exposure in mild operating conditions. As an alternative, more recently, graphene and its derivatives like pristine graphene (PG), reduced graphene oxide (rGO) etc. have been studied for sensing applications owing to their exceptional electronic and physical properties such as high carrier mobility at room temperature, good thermal stability, high mechanical strength, ballistic conductivity and large specific surface area. These sensors show high sensitivity at low operating temperatures (down to room temperature) towards low concentrations of analyte gas. However most of these rGO based sensors exhibit relatively longer response/recovery times than metal-oxide based gas sensors. Hence, nanocomposites formed by hybridizing graphene or its derivatives with metal-oxide nanoparticles are being explored as gas sensing materials. Combining reduced graphene oxide with zinc oxide to form hybrid nanostructures is particularly interesting because not only do they display the individual properties of the metal oxide NPs (faster response/recovery times) and of graphene (high electronic conductivity leading to efficient room temperature gas response), but may also have synergistic effects leading to better sensitivity as a gas sensing material. Here we present a review of the recent progress in rGO-ZnO nanocomposites based gas sensors.

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Section: General Mechanism Of Chemiresistive Gas Sensingmentioning

confidence: 99%

Reduced graphene oxide-zinc oxide nano-composites for gas sensing applications

Gupta

2021

Advanced Materials Proceedings

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“…Introduction of nanoparticles in the base matrix helps in preventing agglomeration of layered materials (such as graphene), and increase the surface area by forming three dimensional networks; an essential part to improve the base matrix performance during sensing [41]. Also, it is reported that catalytic metals such as palladium normally improves the adsorption/desorption kinetics [62]. Furthermore, synergistic effect (cumulative response) due to the presence of different sensing hosts is very important from gas sensor perspectives.…”

Section: Relevance Of Materialsmentioning

confidence: 99%

Nano Layers of 2D Graphene Versus Graphene Oxides for Sensing Hydrogen Gas

Kashyap¹,

Sinha²,

Barman³

et al. 2020

Multilayer Thin Films - Versatile Applications for Materials Engineering

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Hydrogen is one of the most useful but dangerous gases because of its broad combustion range and small ignition temperature. Currently, there is a great need for hydrogen detectors with selectivity, high sensitivity and reliable operations in view of its safe production, storage, transportation and other applications. In this regard, nano thin films of two dimensional materials like graphene, graphene oxide (GO) and reduced graphene oxide (rGO) have immense promise because their material attributes can be exceptionally tuned to achieve the desired characteristics. Also graphene oxide and reduced graphene oxide serve as potential sensing hosts due to the presence of functional groups on their surfaces. In this chapter, an attempt has been made to compare the work done in the field of hydrogen sensors using pure graphene and graphene derivatives such as graphene oxide and reduced graphene oxide. The response parameters like sensitivity, stability, selectivity, response time, recovery time, detection limit, linearity, dynamic range, and working temperatures for various graphene based sensors have been elaborately compared. Finally, a conclusion and future outlook on nano scale thin film of graphene and graphene oxides for gas sensing have been briefly discussed.

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“…These groups disturb the aromatic regions in the basal planes, that is why the layer of graphene oxide consist of both aromatic regions and oxidized aliphatic six-membered rings, which leads to distorted sp3-hybridized geometry and results in the insulating property of Graphene oxide. Normally Graphene oxide is a poor conductor but treatment with heat, light or chemical reduction most of graphene's properties can be restored [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Properties of Graphene Oxide-Metal Oxide Mixed Nanocomposites and their Applications - Review

Majumder¹,

Dutta²,

Dutta³

2019

IJASE

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Graphene oxide-metal oxide mixed nanocomposites have attracted extensive attention in recent days because of the large surface area of graphene moiety which offers sufficient space to accommodate differe nt nanomaterials preventing agglomeration of nanocomposites. These composites can improve the unique properties of graphene and induce new properties such as high dye adsorption capacity, extended light absorption range, enhanced charge separation and transportation properties, photocatalytic performance, sensitivity in chemical and biological sensors etc. In this review, we will briefly discuss different synthetic strategies, properties and various applications of graphene oxide based metal oxide nanocomposites.

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Graphene-Oxide Nano Composites for Chemical Sensor Applications

Cited by 41 publications

References 76 publications

Reduced graphene oxide-zinc oxide nano-composites for gas sensing applications

Reduced graphene oxide-zinc oxide nano-composites for gas sensing applications

Nano Layers of 2D Graphene Versus Graphene Oxides for Sensing Hydrogen Gas

Synthesis, Properties of Graphene Oxide-Metal Oxide Mixed Nanocomposites and their Applications - Review

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