【摘要】 采用简单的水热合成法和后续的热处理步骤制备了由纳米粒子组装的Co₃O₄空心纳米球,利用TG、XRD、SEM、TEM和XPS对Co₃O₄中空纳米球的形貌和结构进行了表征。其中,焙烧650℃的样品仍然能够保持中空球形结构、较好的晶化程度以及较好的晶粒间连接性,对H₂S气体表现出较高的响应灵敏度、选择性和稳定性。在最佳工作温度133℃条件下,对50 ppm H₂S的响应灵敏度为5.20,并在1～100 ppm H₂S浓度范围内呈现良好的线性关系,检测限为1 ppm。更多还原

【Abstract】 Co₃O₄ hollow nanospheres assembled by nanoparticles were prepared by a simple hydrothermal synthesis and subsequent heat treatment.The morphology and structure of Co₃O₄ hollow nanospheres were characterized by the techniques of TG, XRD, SEM, TEM and XPS. The sample calcined at 650 °C possessed the features of the hollow nanosphere structure, the better crystallinity and the good connectivity between grains, showing higher response sensitivity, selectivity and stability to H₂S gas. Under the optimal operating temperature of 133 °C, the gas sensor based on Co₃O₄ calcined at 650 °C showed a high response towards 50 ppm of H₂S（S=5.2） and a good linear relationship within the concentration range of 1～100 ppm, and the detection limit could be as low as 1 ppm.更多还原