采用溶剂热的合成路线,制备了α-Fe2O3多级结构的纳米微球。重点考察了α-Fe2O3多级结构纳米微球的可控合成及气敏性能条件优化。结果表明,在气敏测试温度为150℃时,合成温度为150℃,反应时间为12h,HNO3的加入量为5mL,前驱体在300℃下焙烧2h得到的α-Fe2O3纳米微球,其对10×10-6 H2S气体的气敏响应值可达到10Ra/Rg,是理想的H2S气敏传感器材料。
Nano-microspheres with α-Fe2O3 structure were prepared by solvothermal synthesis.The controllable synthesis of α-Fe2O3 multi-level nanometer microspheres and optimization of gas-sensitive performance conditions were focused.The results shown that when the gas-sensitive test temperature was 150℃,the synthesis temperature was 150℃,the reaction time was 12h,the amount of HNO3 added was 5mL,and the α-Fe2O3 nanospheres obtained by calcining the precursor at 300℃ for 2h were ideal H2S gas-sensitive sensor material,its gas-sensitive response value to 10ppm H2S gas can reach 10Ra/Rg.
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