Abstract
Reduced graphene oxide (rGO) is a reduced form of graphene oxide used extensively in gas sensing applications. On the other hand, in its pristine form, graphene has shortages and is generally utilized in combination with other metal oxides to improve gas sensing capabilities. There are different ways of adding rGO to different metal oxides with various morphologies. This study focuses on rGO-loaded metal oxide nanofiber (NF) synthesized using an electrospinning method. Different amounts of rGO were added to the metal oxide precursors, and after electrospinning, the gas response is enhanced through different sensing mechanisms. This review paper discusses rGO-loaded metal oxide NFs gas sensors.
Highlights
Graphene Oxide-LoadedMetal oxide gas sensors are used to sense various toxic gases and vapors [1,2] in many areas [3]
Hollow NFs are interesting morphologies for gas sensing studies because of their higher surface areas that can interact with gas species [64].For example, a BET surface area of hollow SnO2NFs composited with graphene oxide (GO) was reported to be 33.4m2/g
When loaded on metal oxides, reduced graphene oxide (rGO) nanosheets can increase the overall sensing surface and adsorption sites, which leads to the generation of p-n or p-p heterojunctions with metal oxides and modulate the resistances of the gas sensors
Summary
Metal oxide gas sensors are used to sense various toxic gases and vapors [1,2] in many areas [3]. The general gas sensing mechanism of metal oxide gas sensors stems from the modulation of electrical resistance in the presence of target gases [5]. Different morphologies of metal oxides, such as nanowires [11], nanotubes [12], nanorods [13], nanobelts [14], nanofibers (NFs), nanosheets [15], and hierarchical structures [16], have been used in gas sensing studies This is because gas adsorption on the surface of gas sensing relates directly to the surface area of gas sensors and higher adsorption of gas means higher sensing signal.
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