石墨烯—聚苯胺复合薄膜的制备及其氨敏特性研究
发布时间：2018-10-17 12:56
【摘要】：石墨烯材料具有极大的比表面积和优良的电学性质,在电子学、传感器、新能源材料和器件、光学、生物医学等诸多领域显示出巨大的应用前景。本论文以石墨烯、负载氧化锡的石墨烯和苯胺为原料,制备了石墨烯-聚苯胺二元复合薄膜和负载氧化锡的石墨烯-聚苯胺三元复合氨敏膜,分别采用扫描电镜(SEM)和紫外-可见光谱(UV-Vis)对薄膜微观形貌和结构进行了表征;以平面微叉指电极为传感器件结构制备了复合薄膜氨气传感器,室温条件下测试了其气敏特性,研究了石墨烯掺杂量和制备工艺对传感器氨敏性能的影响,并分析了复合薄膜传感器气敏机理。论文的主要内容如下:1.运用原位自组装技术制备了石墨烯-聚苯胺复合薄膜(1-GR-PANI),研究了石墨烯掺杂量对复合薄膜气敏性能的影响,对比分析了石墨烯/聚苯胺分层薄膜(1-GR/PANI)和复合薄膜的氨气敏感性能。研究发现复合薄膜呈现为纳米纤维网状结构,比单一聚苯胺薄膜(PANI)生长更均匀,薄膜孔隙更大,具有更大的比表面积,显示出比单一PANI薄膜更优的气敏特性。当苯胺单体量为0.002mol,石墨烯掺杂量为1mg时,复合薄膜的敏感性能最佳。实验结果表明制备工艺对薄膜的气敏性能有较大影响,复合薄膜传感器的气敏性能优于分层薄膜,分析认为可能是石墨烯不仅为苯胺单体聚合提供了基体,增大复合薄膜的比表面积,同时对聚苯胺有掺杂作用,在复合薄膜中形成π-π共轭结构,有利于载流子传输。2.运用原位氧化聚合法制备了负载氧化锡的石墨烯-聚苯胺(30-GS-PANI)复合材料,采用旋涂制膜工艺制备了单一PANI、负载氧化锡的石墨烯薄膜(30-GS)和30-GS-PANI复合薄膜,并研究了其氨气敏感特性。30-GS-PANI的表面形貌和紫外光谱分析表明,PANI和GS并不是简单的物理混合,而是在形成复合材料时发生了一定的化学相互作用,PANI围绕GS纳米片生长,形成均匀的纳米纤维结构。实验研究了GS掺杂量对30-GS-PANI性能的影响,当GS掺杂量为30mg,苯胺为0.002mol时,复合薄膜具有最佳的气敏性能。实验同时采用物理混合法制备了混合薄膜,对比分析了混合薄膜与复合薄膜传感器对NH3的响应特性,结果表明复合薄膜较混合薄膜有更优异的气敏特性,这可能是由于三元半导体复合材料之间形成了π-π共轭体系以及界面之间产生了多重异质结效应,有利于气体分子吸附与响应。
[Abstract]:Graphene materials have great specific surface area and excellent electrical properties, which show great application prospects in electronics, sensors, new energy materials and devices, optics, biomedicine and many other fields. In this paper, graphene, graphene supported graphene and aniline were used as raw materials to prepare graphene Polyaniline binary composite film and tin oxide supported graphene Polyaniline composite ammonia sensitive film. The microstructure and microstructure of the films were characterized by scanning electron microscopy (SEM) and UV-Vis spectroscopy (UV-Vis), and the composite thin film ammonia sensors were fabricated using planar micro-interDigital electrodes as the sensing devices, and their gas-sensing properties were measured at room temperature. The effect of graphene doping amount and preparation process on the ammonia sensing performance of the sensor was studied and the gas sensing mechanism of the composite film sensor was analyzed. The main contents of the thesis are as follows: 1. Graphene Polyaniline (1-GR-PANI) composite films were prepared by in situ self-assembly technique. The effect of graphene doping on the gas sensing properties of the composite films was studied. The ammonia sensing properties of graphene / Polyaniline layered films (1-GR/PANI) and composite films were compared and analyzed. It is found that the composite thin films have nano-fiber network structure, which are more uniform than the single Polyaniline thin film (PANI) growth, larger pore size and larger specific surface area, showing a better gas sensitivity than a single PANI film. When the amount of aniline monomer was 0.002 mol and the amount of graphene doped was 1mg, the sensitivity of the composite film was the best. The experimental results show that the preparation process has a great influence on the gas sensing performance of the film, and the gas sensing performance of the composite film sensor is better than that of the layered film. It is considered that graphene not only provides the substrate for the polymerization of aniline monomer, By increasing the specific surface area and doping Polyaniline, 蟺-蟺 conjugated structure is formed in the composite film, which is favorable for carrier transport. 2. Graphene-Polyaniline (30-GS-PANI) composites supported on tin oxide were prepared by in situ oxidation polymerization. Graphene films (30-GS) and 30-GS-PANI composite films supported on single PANI, tin oxide were prepared by spin coating process. The surface morphology and UV spectra of 30-GS-PANI show that PANI and GS are not a simple physical mixture, but a certain chemical interaction occurs in the formation of composite materials. PANI grows around GS nanoparticles. A uniform nanofiber structure is formed. The effect of doping amount of GS on the properties of 30-GS-PANI was investigated experimentally. When the doping amount of GS was 30 mg and aniline was 0.002mol, the composite film had the best gas sensing performance. At the same time, the mixed film was prepared by physical mixing method. The response characteristics of the hybrid film and the composite film sensor to NH3 were compared and analyzed. The results show that the composite film has better gas sensitivity than the mixed film. This may be due to the formation of 蟺-蟺 conjugated systems between ternary semiconductor composites and the effect of multiple heterojunctions between interfaces, which is beneficial to the adsorption and response of gas molecules.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.2
本文编号：2276727
[Abstract]:Graphene materials have great specific surface area and excellent electrical properties, which show great application prospects in electronics, sensors, new energy materials and devices, optics, biomedicine and many other fields. In this paper, graphene, graphene supported graphene and aniline were used as raw materials to prepare graphene Polyaniline binary composite film and tin oxide supported graphene Polyaniline composite ammonia sensitive film. The microstructure and microstructure of the films were characterized by scanning electron microscopy (SEM) and UV-Vis spectroscopy (UV-Vis), and the composite thin film ammonia sensors were fabricated using planar micro-interDigital electrodes as the sensing devices, and their gas-sensing properties were measured at room temperature. The effect of graphene doping amount and preparation process on the ammonia sensing performance of the sensor was studied and the gas sensing mechanism of the composite film sensor was analyzed. The main contents of the thesis are as follows: 1. Graphene Polyaniline (1-GR-PANI) composite films were prepared by in situ self-assembly technique. The effect of graphene doping on the gas sensing properties of the composite films was studied. The ammonia sensing properties of graphene / Polyaniline layered films (1-GR/PANI) and composite films were compared and analyzed. It is found that the composite thin films have nano-fiber network structure, which are more uniform than the single Polyaniline thin film (PANI) growth, larger pore size and larger specific surface area, showing a better gas sensitivity than a single PANI film. When the amount of aniline monomer was 0.002 mol and the amount of graphene doped was 1mg, the sensitivity of the composite film was the best. The experimental results show that the preparation process has a great influence on the gas sensing performance of the film, and the gas sensing performance of the composite film sensor is better than that of the layered film. It is considered that graphene not only provides the substrate for the polymerization of aniline monomer, By increasing the specific surface area and doping Polyaniline, 蟺-蟺 conjugated structure is formed in the composite film, which is favorable for carrier transport. 2. Graphene-Polyaniline (30-GS-PANI) composites supported on tin oxide were prepared by in situ oxidation polymerization. Graphene films (30-GS) and 30-GS-PANI composite films supported on single PANI, tin oxide were prepared by spin coating process. The surface morphology and UV spectra of 30-GS-PANI show that PANI and GS are not a simple physical mixture, but a certain chemical interaction occurs in the formation of composite materials. PANI grows around GS nanoparticles. A uniform nanofiber structure is formed. The effect of doping amount of GS on the properties of 30-GS-PANI was investigated experimentally. When the doping amount of GS was 30 mg and aniline was 0.002mol, the composite film had the best gas sensing performance. At the same time, the mixed film was prepared by physical mixing method. The response characteristics of the hybrid film and the composite film sensor to NH3 were compared and analyzed. The results show that the composite film has better gas sensitivity than the mixed film. This may be due to the formation of 蟺-蟺 conjugated systems between ternary semiconductor composites and the effect of multiple heterojunctions between interfaces, which is beneficial to the adsorption and response of gas molecules.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.2
【参考文献】
相关期刊论文 前1条
1 樊玮;张超;刘天西;;石墨烯/聚合物复合材料的研究进展[J];复合材料学报;2013年01期
，本文编号：2276727
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