二氧化锡及其掺杂（La、Ru、Mn）纳米带的制备及光学、气敏性质的研究

发布时间：2018-05-26 21:57

  本文选题：SnO_2纳米带 + 掺杂　； 参考：《云南师范大学》2016年硕士论文

【摘要】：SnO_2是一种备受关注的n型半导体金属氧化物材料,在气敏传感器领域得到广泛应用。本论文主要工作是制备La、Ru和Mn掺杂的SnO_2纳米带,研究其发光性质。在此基础上制作单片纳米带气敏器件,研究La、Ru和Mn掺杂对SnO_2纳米带气敏特性和气敏选择性的影响,发展对特种物质敏感、选择性强的气敏器件。首先,采用热蒸发法制备厚度薄的纯净SnO_2纳米带以及掺杂稀有金属La、贵金属Ru和金属元素Mn的SnO_2纳米带。通过扫描电子显微镜(SEM)、高分辨率透射电子显微镜(HRTEM)、X射线衍射仪(XRD)、X射线光电子能谱(XPS)、X射线能谱分析仪(EDS)等对SnO_2基纳米带材料进行结构表征和微结构分析。然后,采用掩模板法制作单根纳米带气敏器件,并进行系统的气敏特性测量和分析。同时借助紫外-可见吸收光谱(UV-Vis)、光致发光光谱(PL)和拉曼光谱(Raman)等实验数据,讨论了器件的工作机理。主要结论如下:在气敏特性方面:La、Ru和Mn掺杂的SnO_2纳米带对乙醇、乙二醇、丙酮的最佳工作温度都是210℃,比纯净的SnO_2纳米带的工作温度低。其中La掺杂的SnO_2纳米带对乙二醇较敏感,当乙二醇的浓度为100 ppm时,气敏响应达9.60;Ru掺杂的SnO_2纳米带对丙酮较敏感,,对浓度为100 ppm丙酮,其气敏响应达6.15;Mn掺杂的SnO_2纳米带对乙醇较敏感,其对100 ppm浓度的乙醇的气敏响应达到2.64。在光谱分析方面:掺杂La、Ru和Mn的SnO_2纳米带的紫外吸收光谱分析表明其对应的禁带宽度分别为3.25 eV、3.37 eV和3.43 eV,比纯净SnO_2纳米带的禁带宽度(3.66 eV)都减小了;光致发光研究发现掺杂Ru的SnO_2纳米带的PL光谱整体出现红移现象,主峰和次峰分别红移了3 nm和1 nm;而掺杂La和Mn的SnO_2纳米带主峰有轻微蓝移现象,蓝移量为3 nm和6 nm,次峰分别红移了2 nm和5 nm;掺杂La、Ru和Mn的SnO_2纳米带的拉曼峰比纯净SnO_2纳米带的拉曼峰发生了微小的红移,原因可能是掺杂的SnO_2晶粒尺寸变化或纳米带晶格缺陷等引起的。
[Abstract]:SnO_2 is a kind of n-type semiconductor metal oxide material, which has been widely used in gas sensor field. The main work of this thesis is to prepare SnO_2 nanobelts doped with La-Ru and mn and study their luminescence properties. On this basis, a monolithic nanobelts gas sensing device was fabricated, and the effects of Lauron Ru and mn doping on the gas sensing characteristics and gas sensitivity selectivity of SnO_2 nanobelts were studied, and the gas sensing devices with high selectivity and sensitivity to special materials were developed. Firstly, pure SnO_2 nanobelts with thin thickness and SnO_2 nanobelts doped with rare metal La, noble metal Ru and metal element mn were prepared by thermal evaporation method. The structure and microstructure of SnO_2 based nanobelts were characterized by scanning electron microscopy (SEM), high resolution transmission electron microscopy (TEM) and X-ray diffractometer (XRD). Then, a single nanoband gas sensor is fabricated by mask method, and the gas sensing characteristics of the system are measured and analyzed. At the same time, the working mechanism of the device is discussed with the help of the experimental data of UV-Visn, photoluminescence (PL) and Raman spectroscopy (Raman). The main conclusions are as follows: in terms of gas sensitivity, the optimal working temperature of SnO_2 nanorbons doped with 1: La-Ru and mn is 210 鈩，

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