【摘要】：氧化銦(In203)作為一種優(yōu)異的n型半導(dǎo)體材料,廣泛的應(yīng)用于氣體傳感器等領(lǐng)域。為提升材料性能,通常采用調(diào)控材料結(jié)構(gòu)、組成及形貌的方法。本論文一方面將氧化銦與石墨烯復(fù)合,制備出具有室溫響應(yīng)的復(fù)合氣敏材料；另一方面采用模板法,制備出了金負(fù)載的三維有序大孔結(jié)構(gòu)(3DOM)氧化銦,并研究了其對乙醇的氣敏性能。主要工作如下：1.氧化銦-還原石墨烯(In2O3-rGO)復(fù)合納米材料的制備及其在室溫下對N02氣敏性能的研究。首先,通過改進(jìn)的Hummers的方法制備氧化石墨烯,進(jìn)而通過水熱法使氧化銦納米粒子生長在氧化石墨烯上,最后還原得到In2O3-rGO復(fù)合材料,并在室溫下測試其對NO2的氣敏性能。采用透射(TEM)、原子力顯微鏡(AFM)、X射線光電子能譜(XPS)、拉曼光譜(Raman)、X射線衍射(XRD)、紅外(FTIR)等手段對In2O3-rGO進(jìn)行了詳細(xì)的表征。所制備的氧化石墨烯具有單層結(jié)構(gòu),復(fù)合材料表面氧化銦粒子分散均勻,粒徑約為10 nm。經(jīng)水熱及還原處理后,氧化石墨烯的還原程度增加。對不同石墨烯摻雜量的復(fù)合材料進(jìn)行氣敏測試,當(dāng)石墨烯摻雜量為0.72%時(shí),氣敏性能最佳。在室溫條件下,其對30 ppm NO2氣體靈敏度達(dá)8.25,對其響應(yīng)時(shí)間及恢復(fù)時(shí)間分別為4min和24 min,且對NO2氣體具有優(yōu)異的選擇性。最后分析了In2O3-rGO對NO2的氣敏響應(yīng)機(jī)理。2.金負(fù)載三維有序大孔結(jié)構(gòu)氧化銦(Au-3DOM In2O3)的制備及其對乙醇?xì)怏w的氣敏性能研究。以聚甲基丙烯酸甲酯(PMMA)球?yàn)槟０?In(NO3)3為銦源,制備出3DOM結(jié)構(gòu)的In203。再將3DOM In2O3與HAuCl4混合,通過還原法制備出Au-3DOM In2O3。利用透射電鏡(TEM),掃描電鏡(SEM)等觀察到負(fù)載后的復(fù)合材料仍具有較為完整的骨架結(jié)構(gòu),負(fù)載的金納米尺寸較為均一,約為5nm左右。通過EDS, ICP等表征手段對金納米顆粒的負(fù)載量進(jìn)行了分析,實(shí)際負(fù)載0.39%。小尺寸的金納米顆粒與三維有序大孔結(jié)構(gòu)的氧化銦結(jié)合,有效提升了對乙醇?xì)怏w的氣敏性能。在最佳工作溫度230℃時(shí),Au-3DOM In2O3對100ppm乙醇?xì)怏w的氣敏響應(yīng)值提升到205,且響應(yīng)(15s)/恢復(fù)(21s)時(shí)間均較短,選擇性較好。通過TPSR研究了Au-3DOM In2O3對乙醇的氣敏響應(yīng)機(jī)理。
[Abstract]:Indium oxide (in 203), as an excellent n-type semiconductor material, is widely used in gas sensors and other fields. In order to improve the properties of materials, the structure, composition and morphology of the materials are usually regulated. In this paper, on the one hand, indium oxide and graphene were combined to prepare composite gas sensing materials with room temperature response, on the other hand, three dimensional ordered macroporous structure (3Dom) of indium oxide supported on gold was prepared by template method. Its gas sensitivity to ethanol was also studied. The main work is as follows: 1. Preparation of In2O3-rGO composite nanomaterials and study on their gas-sensing properties at room temperature. Firstly, graphene oxide was prepared by modified Hummers method, and then indium oxide nanoparticles were grown on graphene oxide by hydrothermal method. Finally, In2O3-rGO composites were prepared by reduction, and their gas-sensing properties to no _ 2 were tested at room temperature. In2O3-rGO was characterized by transmission (TEM), atomic force microscopy (AFM) X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman) X-ray diffraction (XRD) and infrared spectroscopy (FTIR). The prepared graphene oxide has a monolayer structure. The indium oxide particles on the surface of the composite are dispersed uniformly and the particle size is about 10 nm. After hydrothermal treatment and reduction treatment, the reduction degree of graphene oxide increased. When the content of graphene was 0.722, the gas sensing property of composites with different graphene content was the best. At room temperature, its sensitivity to 30 ppm no _ 2 gas is 8.25, its response time and recovery time are 4min and 24 min, respectively, and it has excellent selectivity for no _ 2 gas. Finally, the gas sensing response mechanism of in _ 2O _ 3-rGO to no _ 2 was analyzed. Preparation of Au-3DOM-In2O3 and its gas sensitivity to ethanol gas were investigated. Using polymethyl methacrylate (PMMA) sphere as template in (no _ 3) _ 3 as indium source, In203with 3Dom structure was prepared. Au-3Dom in _ 2O _ 3 was prepared by reduction method by mixing 3Dom in _ 2O _ 3 with HAuCl _ 4. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) showed that the loaded composite still had a relatively complete skeleton structure, and the size of the loaded gold nanoparticles was uniform, about the size of 5nm. The loading amount of gold nanoparticles was analyzed by means of EDS and ICP, and the actual load was 0.39. The combination of small size gold nanoparticles and indium oxide with three dimensional ordered macroporous structure can effectively improve the gas sensitivity of ethanol gas. At the optimum operating temperature of 230 鈩，

本文編號(hào)：2124276