Synthesis Of Highly Dispersed Zn O Nanoparticles On Graphene Surface And Their Acetylene Sensing Properties

1494 words - 6 pages

The synergistic interplay among nanomaterials has been exploring new features of nanocomposite materials, that facilitate ample amenities for advanced applications. As regards gas sensing application, chemical sensors have a profound influence in detecting and monitoring hazardous analytes which are essential for safety reasons in both industrial and domestic environments. The technological challenge on ongoing headway in chemical sensors concern simple, high performance practical sensors. In the last few years, ZnO based chemical sensors have been investigated extensively and has been considered as one of the promising candidates for chemical sensors due to their good adsorption ...view middle of the document...

Most recently, Fowler et al. [14] discussed about chemically derived graphene as highly sensitive chemical sensors due to its extraordinary carrier mobility. From several reports it is evident that, in ZnO-graphene composition, graphene as a template plays a vital role that not only prevents agglomeration of ZnO nanomaterials but also brings about new physical and chemical properties of the composite materials [15].
Acetylene (C2H2) is a colorless combustible hydrocarbon and the simplest alkyne with a distinctive odor, widely used as fuel and many industrial applications such as preparation of organic chemicals like 1, 4-butanediol, vitamins, welding and metal cutting, dry-cell batteries, etc. It is quite unstable in pure form and usually handled in solution and becomes highly explosive when it is liquefied, compressed, heated or mixed with air. For this reason, special safety measure is vital during its production and handling. At the same time, the range of interest for its detection is much wider typically 0.01–10 vol.% to cover the early leakage warning and explosive indication. Yet, despite the demands of the practical C2H2 sensors, a few reports have been focused on it.
Recently, Wang et al. [9] published their experimental results showing effective improvement by doping 5 at% Ni in ZnO nanofibers with a maximum sensitivity of ~17% to 2000 ppm C2H2 at 250 oC. Tamaekong et al. [8] developed C2H2 sensor based on Pt/ZnO thick films through flame spray pyrolysis method with a low detection limit of 50 ppm gas concentration at 300 oC. Zhang et al. [16] hydrothermally synthesized hierarchical nanoparticles decorated ZnO microdisk as sensing material and the result showed preferential advancement in C2H2 sensing within a range of 1-4000 ppm gas concentration at 420 oC where 1 ppm can be detected with a response of 7.9. Dong et al. [17] reported arc plasma assisted Ag/ZnO composites for C2H2 sensing with a maximum response 42 towards 5000 ppm at 120 oC. Besides, few researchers dealt with SnO2 NPs [18], Pd-SnO2 [19], Sm2O3-SnO2 [20], Au/MWCNT [21], Ag/Pd-SiO2 [22], etc. for C2H2 sensing. However, the reports showed promising advancement at high temperature, graphene-ZnO based C2H2 sensors are hardly found which may be a challenging focus in near future.
In this work, we synthesize a ZnO nanoparticles (NPs) decorated reduced graphene oxide (rGO) composite via a simple solvothermal method and investigate its sensing behavior towards C2H2 gas. The main aim of this research is to overcome the above mentioned limitations and to develop a high performance C2H2 sensor operable at moderate temperature. It is evident from the experimental results that GO addition in ZnO nanostructure is one of the promising hubs for high performance C2H2 sensor with high sensing response, long-term stability, and outstanding selectivity towards target gas. Furthermore, the simplistic synthesis process of the composite is advantageous in fabricating of practical C2H2...

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