p-CuO/n-In_2O_3异质结纳米纤维的制备及气敏特性

以电纺In_2O_3纳米纤维为模版,通过溶剂热法构建了p-CuO/n-In_2O_3异质结纳米纤维.采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等方法对所得材料的形貌和结构进行表征.结果表明,CuO纳米颗粒可以均匀地负载在超细In_2O_3纳米纤维表面;随着反应液中乙酸铜浓度的增加,负载的CuO纳米颗粒密度也逐渐增加.通过制备旁热式气敏器件对复合纳米纤维材料的气敏特性进行了研究.结果表明,与纯In_2O_3纳米纤维相比,p-CuO/n-In_2O_3异质结纳米纤维对H_2S气体具有较高的灵敏度和较低的工作温度.

Preparation of p-CuO/n-In2O3 Heterojunction Nanofibers and Their Gas Sensing Properties

p-CuO/n-In2 O3 heterojunction nanofibers were prepared by solvothermal method using electrospun In2 O3 nanofibers as template. The surface morphologies and microstructures of the composite nanofibers were characterized by field emission scanning electron microscopy( SEM) , transmission electron microscopy (TEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). It was found that the In2O3 nanofibers were uniformly decorated with CuO nanoparticles, and the surface densities of CuO nanoparticles could be controlled by varing the precursor concentration of cupric acetate. Side-heated gas sensors were prepared based on these composite nanofiers. The p-CuO/n-In2 O3 heterojunction nanofibers exhibited high gas responses and low operating temperature for detecting H2 S gas compared with pure In2 O3 nanofibers.