Abstract
We report on the fabrication of a NO2 gas sensor from room-temperature reduction of graphene oxide(GO) via two-beam-laser interference (TBLI). The method of TBLI gives the distribution of periodic dissociation energies for oxygen functional groups, which are capable to reduce the graphene oxide to hierarchical graphene nanostructures, which holds great promise for gaseous molecular adsorption. The fabricated reduced graphene oxide(RGO) sensor enhanced sensing response in NO2 and accelerated response/recovery rates. It is seen that, for 20 ppm NO2, the response (Ra/Rg) of the sensor based on RGO hierarchical nanostructures is 1.27, which is higher than that of GO (1.06) and thermal reduced RGO (1.04). The response time and recovery time of the sensor based on laser reduced RGO are 10 s and 7 s, which are much shorter than those of GO (34 s and 45 s), indicating that the sensing performances for NO2 sensor at room temperature have been enhanced by introduction of nanostructures. This mask-free and large-area approach to the production of hierarchical graphene micro-nanostructures, could lead to the implementation of future graphene-based sensors.
Highlights
Yun et al presented 3D nanostructured RGO scaffold using method of electrostatic self-assembly[23]
By Two-beam-laser Interference method, surface area of the film is increased, the sensitivity of the device towards NO2 has been enhanced, the response and recovery time is reduced to varying degrees
Scanning electron microscope (SEM) images of GO film was shown in Fig. 1c, GO film was patterned into hierarchical nanostructures
Summary
Yun et al presented 3D nanostructured RGO scaffold using method of electrostatic self-assembly[23]. The method of freeze drying was reported for the fabricating of 3D graphene/SnO2 structure[24] and 3D SnO2/RGO structure[25]. Lupan et al reported a low-powered sensor based on a microtube network[26]. These methods are limited by restricted temperature, mask, requirement of special equipment and substrate transfer or difficulty in mass production. We propose a strategy on the regulation of surface characteristics of graphene oxide using laser micro-nanofabrication technology, to build a high specific surface area of micro-nanostructures and fabricate graphene-based NO2 sensor. By Two-beam-laser Interference method, surface area of the film is increased, the sensitivity of the device towards NO2 has been enhanced, the response and recovery time is reduced to varying degrees
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