本文選題：SnO_2納米帶 + 摻雜�。� 參考：《云南師范大學(xué)》2016年碩士論文

【摘要】：SnO_2是一種備受關(guān)注的n型半導(dǎo)體金屬氧化物材料,在氣敏傳感器領(lǐng)域得到廣泛應(yīng)用。本論文主要工作是制備La、Ru和Mn摻雜的SnO_2納米帶,研究其發(fā)光性質(zhì)。在此基礎(chǔ)上制作單片納米帶氣敏器件,研究La、Ru和Mn摻雜對SnO_2納米帶氣敏特性和氣敏選擇性的影響,發(fā)展對特種物質(zhì)敏感、選擇性強(qiáng)的氣敏器件。首先,采用熱蒸發(fā)法制備厚度薄的純凈SnO_2納米帶以及摻雜稀有金屬La、貴金屬Ru和金屬元素Mn的SnO_2納米帶。通過掃描電子顯微鏡(SEM)、高分辨率透射電子顯微鏡(HRTEM)、X射線衍射儀(XRD)、X射線光電子能譜(XPS)、X射線能譜分析儀(EDS)等對SnO_2基納米帶材料進(jìn)行結(jié)構(gòu)表征和微結(jié)構(gòu)分析。然后,采用掩模板法制作單根納米帶氣敏器件,并進(jìn)行系統(tǒng)的氣敏特性測量和分析。同時借助紫外-可見吸收光譜(UV-Vis)、光致發(fā)光光譜(PL)和拉曼光譜(Raman)等實(shí)驗(yàn)數(shù)據(jù),討論了器件的工作機(jī)理。主要結(jié)論如下:在氣敏特性方面:La、Ru和Mn摻雜的SnO_2納米帶對乙醇、乙二醇、丙酮的最佳工作溫度都是210℃,比純凈的SnO_2納米帶的工作溫度低。其中La摻雜的SnO_2納米帶對乙二醇較敏感,當(dāng)乙二醇的濃度為100 ppm時,氣敏響應(yīng)達(dá)9.60;Ru摻雜的SnO_2納米帶對丙酮較敏感,,對濃度為100 ppm丙酮,其氣敏響應(yīng)達(dá)6.15;Mn摻雜的SnO_2納米帶對乙醇較敏感,其對100 ppm濃度的乙醇的氣敏響應(yīng)達(dá)到2.64。在光譜分析方面:摻雜La、Ru和Mn的SnO_2納米帶的紫外吸收光譜分析表明其對應(yīng)的禁帶寬度分別為3.25 eV、3.37 eV和3.43 eV,比純凈SnO_2納米帶的禁帶寬度(3.66 eV)都減小了;光致發(fā)光研究發(fā)現(xiàn)摻雜Ru的SnO_2納米帶的PL光譜整體出現(xiàn)紅移現(xiàn)象,主峰和次峰分別紅移了3 nm和1 nm;而摻雜La和Mn的SnO_2納米帶主峰有輕微藍(lán)移現(xiàn)象,藍(lán)移量為3 nm和6 nm,次峰分別紅移了2 nm和5 nm;摻雜La、Ru和Mn的SnO_2納米帶的拉曼峰比純凈SnO_2納米帶的拉曼峰發(fā)生了微小的紅移,原因可能是摻雜的SnO_2晶粒尺寸變化或納米帶晶格缺陷等引起的。
[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，

本文編號：1939056