α-Fe2O3纳米微球的合成及气敏性能研究

Synthesis and Gas-sensing Properties of α-Fe2O3 nanospheres

采用溶剂热法制备了球状结构的氧化铁前驱体，再经400℃热处理后得到α-Fe2O3纳米微球。通过TG、IR、XRD和SEM等手段对产物结构和形貌进行了表征。结果表明，合成的α-Fe2O3纳米微球直径约为500nm。此外，我们将α-Fe2O3纳米微球制备成厚膜型气敏元件并进行气敏性能测试，在工作温度为150℃时，α-Fe2O3纳米微球对苯胺（AN）有良好的选择性和较高的灵敏度，最低检出限可达到1．9mg／m^3，对38mg／m^3苯胺的响应值为10．4。测试结果表明，α-Fe2O3纳米微球可用于制备苯胺气体传感器。

Spherical iron oxide precursor was prepared using solvothermal method, and thermally treated at 400℃ to obtain α- Fe203 nanoparticle.The structures and morphologies of the as-obtained products were confirmed by TG, IR, XRD, and SEM.The results showed that the diameter of α-Fe203 nanoparticle is about 500 nm.In addition,the thick film of a-Fe203 nanopartiele was fabricated as gas sensor and performed the gas sensing test.When the working temperature was set at 150 ℃ , ot-Fe203 nanoparticle has very good selectivity and high sensitivity to aniline （AN） .The minimum detection limit can reach down to 1.9 mg/m3 , and re- sponse value for 38 mg/m3 aniline was 10. 4.These results show that the α-Fe203 nanoparticle can be used to prepare practical gas sensors for aniline.