氧化铟复合纳米材料的制备及其气敏性能研究
发布时间：2018-07-15 13:48
【摘要】：氧化铟(In203)作为一种优异的n型半导体材料,广泛的应用于气体传感器等领域。为提升材料性能,通常采用调控材料结构、组成及形貌的方法。本论文一方面将氧化铟与石墨烯复合,制备出具有室温响应的复合气敏材料；另一方面采用模板法,制备出了金负载的三维有序大孔结构(3DOM)氧化铟,并研究了其对乙醇的气敏性能。主要工作如下：1.氧化铟-还原石墨烯(In2O3-rGO)复合纳米材料的制备及其在室温下对N02气敏性能的研究。首先,通过改进的Hummers的方法制备氧化石墨烯,进而通过水热法使氧化铟纳米粒子生长在氧化石墨烯上,最后还原得到In2O3-rGO复合材料,并在室温下测试其对NO2的气敏性能。采用透射(TEM)、原子力显微镜(AFM)、X射线光电子能谱(XPS)、拉曼光谱(Raman)、X射线衍射(XRD)、红外(FTIR)等手段对In2O3-rGO进行了详细的表征。所制备的氧化石墨烯具有单层结构,复合材料表面氧化铟粒子分散均匀,粒径约为10 nm。经水热及还原处理后,氧化石墨烯的还原程度增加。对不同石墨烯掺杂量的复合材料进行气敏测试,当石墨烯掺杂量为0.72%时,气敏性能最佳。在室温条件下,其对30 ppm NO2气体灵敏度达8.25,对其响应时间及恢复时间分别为4min和24 min,且对NO2气体具有优异的选择性。最后分析了In2O3-rGO对NO2的气敏响应机理。2.金负载三维有序大孔结构氧化铟(Au-3DOM In2O3)的制备及其对乙醇气体的气敏性能研究。以聚甲基丙烯酸甲酯(PMMA)球为模板,In(NO3)3为铟源,制备出3DOM结构的In203。再将3DOM In2O3与HAuCl4混合,通过还原法制备出Au-3DOM In2O3。利用透射电镜(TEM),扫描电镜(SEM)等观察到负载后的复合材料仍具有较为完整的骨架结构,负载的金纳米尺寸较为均一,约为5nm左右。通过EDS, ICP等表征手段对金纳米颗粒的负载量进行了分析,实际负载0.39%。小尺寸的金纳米颗粒与三维有序大孔结构的氧化铟结合,有效提升了对乙醇气体的气敏性能。在最佳工作温度230℃时,Au-3DOM In2O3对100ppm乙醇气体的气敏响应值提升到205,且响应(15s)/恢复(21s)时间均较短,选择性较好。通过TPSR研究了Au-3DOM In2O3对乙醇的气敏响应机理。
[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，
本文编号：2124276
[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，
本文编号：2124276
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