兰州大学机构库 >物理科学与技术学院
氧化铟纳米材料的可控合成与气敏性能研究
Alternative TitleStudy of the controlled synthesis of indium oxide nanomaterials and their application forgas sensing
刘斌
Thesis Advisor谢二庆
2013-12-02
Degree Grantor兰州大学
Place of Conferral兰州
Degree Name硕士
KeywordIn2O3 中空/多孔 可控合成 高比表面积 气敏性能
Abstract中空或多孔结构纳米材料由于具有大的比表面积,在气敏、催化、光学等领域具有广泛的应用前景,成为近几年纳米材料领域的研究热点。In2O3作为一种非常重要的半导体气敏材料,具有较高的禁带宽度(Eg=3.6 eV)、较高的催化性能、低的工作温度,已成为气敏材料领域的研究热点之一。本论文针对中空/多孔结构的In2O3纳米材料的水热法制备及气敏性能,主要开展了以下研究工作: 首先研究了蔗糖用量、反应温度、反应时间等因素对In2O3的空心多孔微球形貌和气敏性能的影响。实验发现随着蔗糖用量2 g、4 g、8 g的增加,气敏性能先增大后减小,4 g的蔗糖制的产物气敏测试对酒精和甲醛响应最高;随反应温度150 ℃、180 ℃、210 ℃的逐渐升高,空心壁厚和气敏性能都是先增大后减小,温度为180 ℃时,样品壁厚达150 nm,气敏性能检测结果最高;虽然空心微球表面孔隙随着反应时间越来越致密,然而气敏性能随时间仍是先增大后减小。当3 mmol 5.76 ml 的In(NO3)3和4 g蔗糖在水热180 ℃12 h下,气敏测试对酒精和甲醛响应最高分别达到90和72。 其次研究了In2O3中空/多孔微米棒ZnO微米棒长径比、羟基氧化In沉积次数和腐蚀浓度等因素对产物形貌、气敏性能的影响。实验结果发现利用长径比为8的ZnO微米棒作为模板制备的In2O3中空/多孔微米棒不仅具有较大的比表面积且不容易腐蚀塌陷;羟基氧化In连续8次沉积壁厚达100 nm才能将ZnO模板完全包裹,且pH=1的HCl恰好可去除芯部ZnO同时不会破坏壳壁In2O3的结构。利用该纳米多孔材料制成气体传感器进行性能测试,结果显示对酒精特别是低浓度的酒精具有很好的响应,响应值分别为:4 ppm的酒精为5,350 ppm的酒精为92。
Other AbstractHollow or porous materials have recently attracted considerable attention due to their specific structure with low density, high specific surface in chemical sensor, drug delivery and photocatalysis. As a very important n-type wide-band gap (3.6 eV) semiconductor, In2O3 has been widely used in solar cells, flat panel displays, gas detectors, etc, owing to its high electric conductance, high transparency to visible light, and the strong interaction between certain poisonous gas molecules and In2O3 surfaces. Because of the size and shape-dependent properties, controllable growth and mechanism studies of hollow or porous In2O3 with different morphologies are important. In this work, different morphologies of porous indium-oxide (In2O3) nanomaterials, including hollow spheres and hollow nanorods, have been successfully prepared by hydrothermal process. The main works can be summarized as follows: First In2O3 hollow microspheres were successfully synthesized by hydrothermal process in the system of saccharides and In(NO3)3 mixtures in combination with heat-treatment. The effects of saccharides amount, temperatures and reaction times have been explored. It is found that the wall-thick of the hollow spheres increases at first, then decrease with the reaction temperatures increased from 150 ℃, 180 ℃ to 210 ℃, and the maximum wall-thick was 150 nm when the temperatures was 180 ℃. Similarly, the gas sensing properties also present the same change trend with the amounts of saccharide changed from 2 g, 4 g to 8 g. The highest gas sending response to ethanol and formaldehyde was 90 and 72, respectively, when the products obtained from the system of 3 mmol (In2O3) and 4g saccharides. Next this work focuses on the design and synthesis of mesoporous In2O3 nanotubes with hollow structures. So, a method for the preparation of mesoporous In2O3 nanotubes(the three-step method)was developed. Firstly, ZnO nanorods were prepared which acting as hard templates to hollow In2O3 structures; Then, In(OH)3 nanoparticles grown on the surface of ZnO nanorods, and followed by the formation of mesoporous In2O3 shell on ZnO nanorods by heat-treatment at 600 ℃; Finally, acidic etching was adaped to remove the ZnO nanorods to form hollow structured In2O3 nanotubes. The influence factors on the morphologies, gas sensing properties, and aspect ratios of In2O3 hollow nanotubes, such as deposition times, concentration of acidic, were investigated. The results show that the optimum fa...
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Language中文
Document Type学位论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/229122
Collection物理科学与技术学院
Recommended Citation
GB/T 7714
刘斌. 氧化铟纳米材料的可控合成与气敏性能研究[D]. 兰州. 兰州大学,2013.
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