Hydrogen Sensing with Villous Zinc Oxalate

Villous zinc oxalate (ZnC2O4) was synthesized using the sol–gel and laser method demonstrated in a previous paper, and the hydrogen-sensing properties of villous ZnC2O4 were investigated. The mixing ratio of reduced graphene oxide (RGO) to ZnO to form ZnC2O4 is predictive of its hydrogen-sensing capabilities. The microstructure evolution of villous structures was characterized by X-ray diffraction and field emission scanning electron microscopy techniques. Gassensing experiments tested response, recovery, and selectivity. The villous structure of ZnC2O4 can sense hydrogen at room temperature and an optimum operable temperature of 150°C at a specific C/Zn ratio. The strong hydrogen response is attributed to the villous structure and high C/Zn ratio of the 1:1 RGO to ZnO mixing ratio.