Abstract
Graphene-based materials have aroused enormous focus on a wide range of engineering fields because of their unique structure. One of the most promising applications is gas adsorption and sensing. In electrical engineering, graphene-based sensors are also employed as detecting devices to estimate the operation status of gas insulated switchgear (GIS). This paper reviews the main synthesis methods of graphene, gas adsorption, and sensing mechanism of its based sensors, as well as their applications in detecting SF6 decomposing products, such as SO2, H2S, SO2F2, and SOF2, in GIS. Both theoretical and experimental researches on gas response of graphene-based sensors to these typical gases are summarized. Finally, the future research trend about graphene synthesis technique and relevant perspective are also given.
Highlights
The past several decades have witnessed increasing attention by researchers to carbon-based materials, especially those formed by sp2 C atoms such as carbon nanotubes and graphene owing to their unique structure, a soft membrane
0.13Pt-decorated e and the energy gap for eV were material obtained.toThe negative Qas that electrons t demonstrated that graphene isto a promising gasan sensors thethe detection of transfer from the graphene the SO2 molecule, giving be riseprepared to Pt-graphene, n-type for semiconductor
Seredych et al [60,61,62,63,64] synthesized zirconium hydroxide/graphene composites, with the content of the graphene ranging from 5% to 50%, to study the adsorption of SO2 and H2 S at room temperature and found that new forming basic sites and high porosity due to the reactions between zirconium hydroxide units and the oxygen groups on the graphene layers contribute to the intensive sorption for these two categories of gases
Summary
The past several decades have witnessed increasing attention by researchers to carbon-based materials, especially those formed by sp C atoms such as carbon nanotubes and graphene owing to their unique structure, a soft membrane. In terms of gas adsorption and sensing on graphene-based materials, a large amount of research [13,14,15,16,17,18] has been carried out for many years, aimed at exploiting new-fashioned types of graphene-based sensors that are capable of detecting individual gases with a relatively high sensitivity, which has already made great breakthroughs It has been well-known that sulfur hexafluoride (SF6 ) gas, a most commonly utilized kind of insulation gas in high voltage equipment of power systems, especially gas-insulated switchgear (GIS) due to its excellent chemically inert and wonder dielectric strength [19,20], is inevitably decomposed under partial discharge in a long running device.
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