Synthesis And Gas Sensitive Properties Of Graphene Nanocomposites

Nowadays with the development of social production,all sorts of toxic gas emissions is more and more serious,the demand for high standard and performance gas sensitive material is becoming more and more urgent.While graphene is the only two-dimensional carbon material that can be stably present,It has a wide application prospect in gas sensor.N-type and P-type semiconductor oxides can effectively improve the carrier concentration of graphene by recombination with grapheme,Thereby improving its gas-sensing properties.In addition,When metal nanoparticles are doped in grapheme,The conductivity of the graphene can be effectively improved,Thereby improving the gas-sensing properties of the gas-sensing material.In this paper,we prepared RGO by hot reduction graphene oxide at 500?.Using diffirent chemical methods respectively to prepare RGO/NiO,RGO/Fe₂O₃,RGO/Ag nanocomposites;Using XRD,Raman spectra,SEM characterization method on the morphology and structure,then researching the gas-sensing properties under different heating voltage,the concrete content is as follows?1?In this paper Three different ratios of RGO/NiO were successfully prepared by hydrothermal method.NiO is evenly distributed on the surface of the RGO sheet.The results of gas-sensing test show that RGO/NiO gas-sensitive properties compared to RGO significantly improved,The sensitivities of RGO/0.6gNiCl₂ at ambient temperature were 0.2 at 15 ppm NO₂ and 0.28 at 150 ppm.?2?Using hydrothermal synthesis method respectively to prepare RGO/Fe₂O₃ nanocomposites,through the SEM images,you can see that Fe₂O₃ nanoparticles are uniformly distributed on the graphene layer surface.With the increase of FeCl₃ · 6H₂ O,the Fe₂O₃ nanoparticles on RGO surface increased.Comparing with RGO,the gas sensing properties RGO/Fe₂O₃ all have varying degrees of increase at room temperature.When the NO₂ concentration is 15 ppm at room temperature,the RGO/Fe₂O₃ formed by GO: FeCl₃ · 6H₂ O = 1: 6 can reach 0.28.?3?The RGO/Ag nanocomposite morphology analysis shows that the composite dispersed more evenly,The gas sensitive test shows that the RGO/Ag higher performance than pure RGO,The response sensitivity of RGO/5% Ag was the highest under different heating voltage,and reached 0.15 and 0.4 at 15 ppm and 150 ppm at room temperature.