In recent years,H2S as a novel biomarker for asthma and chronic obstructive pulmonary disease is of great significance to human health monitoring,so it is urgent to study H2S sensors with low power consumption,high selectivity,low detection limit and high stability.Co(CO3)0.5(OH)·0.11H2O/WO3 nanomaterials were synthesized by a two-step in situ growth method.Different Co(CO3)0.5(OH)·0.11H2O/WO3 nanomaterials were grown in situ on WO3 nanosheets by regulating the water bath reaction time using WO3 nanosheets as a substrate synthesized by in situ hydrothermal method.The composites were characterized by FE-SEM,FTIR,XRD and TG,and then tested for gas sensing performance.The results show that the Co(CO3)0.5(OH)·0.11H2O/WO3 composite prepared after 20 min reaction has the best gas-sensitive property,and the response value to 50×10-6 H2S gas at the optimal working temperature(90℃)is as high as 109.The response and recovery time are 130 s and 182 s respect-ively,showing excellent selectivity for H2S gas.The composite still has a good response/recovery curve in low con-centration H2S(3×10-6)atmosphere.In three repeated tests conducted in one month,it showed good repeatability and long-term stability.The in-situ preparation of Co(CO3)0.5(OH)·0.11H2O/WO3 gas sensing materials and the study of gas sensing properties provide a new idea for the preparation of gas sensing devices and a new way for the diversity of gas sensing materials.It has potential application value in environmental detection and intelligent medical treatment.
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