p-n异质结CuO-CeO2的制备及其丙酮气敏性能

Preparation and acetone gas sensing properties of CuO-CeO2 nanocomposites with p-n heterostructures

摘要:

以Ce(NO3)3?6H2O和Cu(NO3)2?3H2O为原料，NaOH为沉淀剂，用水热法制备了CuO-CeO2复合材料。采用X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），紫外-可见吸收谱（UV-vis），X射线光电子能谱（XPS）和比表面及孔径分布测试技术对材料进行了表征。研究表明，与纯CeO2相比，CuO-CeO2具有较小的颗粒尺寸（10~40 nm）和较大的比表面积（38 m2/g）。CuO-CeO2对丙酮具有良好的气敏性能，对100 mg/L丙酮的灵敏度为95，与纯CeO2相比灵敏度提高43倍，气敏性能的增强是由于CuO与CeO2复合后比表面积的增大及两者界面上形成的p-n异质结引起的。

Abstract:

CuO-CeO2 Nanocomposites were prepared by hydrothermal synthesis using Ce(NO3)3?6H2O and Cu(NO3)2?3H2O as raw materials and NaOH as precipitant. The materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope(TEM), Uv-visible absorption spectrum (UV-vis), X-ray photoelectron spectroscopy(XPS) and specific surface and aperture distribution measurement technique. The researches shows that compared with pure CeO2, CuO-CeO2 has a smaller particle size of 10~40 nm, and a larger specific surface area 38 m2/g. CuO-CeO2 has a good gas-sensitive response to acetone, and its sensitivity to 100 mg/L acetone is 95, which is 43 times higher than that of pure CeO2. The mechanism of enhancing gas sensing properties was discussed in detail, which is attributed to the increase of specific surface area of CuO and CeO2 compound and the formation of p-n heterojunction at the interface between CuO and CeO2.