p-n型CuO/α-Fe_2O_3复合半导体材料的制备与气敏性能研究

Synthesis and Gas Sensing Properties of p-n Type CuO/α-Fe_2O_3 Nanomaterials

采用化学沉淀法制备了纯态CuO和α-Fe_2O_3颗粒,并采用沉积-沉淀法将p型半导体CuO负载到n型半导体α-Fe_2O_3表面,制备了p-n型复合半导体氧化物气体敏感材料CuO/α-Fe_2O_3.对所合成的材料进行了XRD、SEM、TEM和XPS表征.结果显示:负载量较低时,CuO高分散在α-Fe_2O_3载体表面,当负载量达到30%时,形成了新的CuFe_2O_4晶相;所合成的样品由粒径大小约10 nm的纳米颗粒组成.气敏性能测试结果显示:该材料在100℃的较低温度下,对CO的灵敏度相对纯α-Fe_2O_3提高了几十倍.

CuO and α-Fe2O3 nanomaterials were prepared by the chemical precipitation method. And,the pn type semiconductor metal oxide composite was successfully prepared by the deposition-precipitation method.The structure and morphology of the as-prepared samples were characterized by the techniques of powder X-ray diffraction（XRD）,scanning electron microscope（SEM）,transmission electron microscopy（TEM） and Xray photoelectron spectroscopy（XPS）. The analysis results indicated that when the content of CuO was small,the CuO nanoparticles were high dispersed on the surface of α-Fe2O3. When the content of CuO over 30mol%,the new phase of CuFe2O4 was formed. The SEM and TEM images showed that the obtained sample consisted of the nanoparticles with the size of about 10 nm.