Sensors and Sensor Networks: Design, Synthesis and Performance Evaluation of Nanocomposite Semiconductor Gas Sensors

传感器和传感器网络：纳米复合半导体气体传感器的设计、合成和性能评估

• 批准号: 0329631
• 负责人: Margaret Wooldridge
• 金额: $ 27.26万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0329631&HistoricalAwards=false
• 关键词: Sensors; Sensor; Networks; Design; Synthesis

The primary objective of the proposed research program is to successfully demonstrate dramatically improved performance of nanocomposite SnO2 sensors made using a novel synthesis approach. Staged nucleation of nanoparticles will be used to make high-value-added SnO2 sensor materials doped with noble metal additives using a multi-element diffusion burner. In particular, gold nano-islands are expected to yield remarkable increases in sensor sensitivity due to the extremely high catalytic activity of Au demonstrated in previous studies. Therefore, the Au/SnO2 system will be the primary focus of the research effort. The effects of particle size, Au loading and relative particle morphologies on sensor performance will be quantitatively determined. High-resolution microscope imaging (e.g. scanning and transmission electron microscopy coupled with elemental analysis methods) will be used to characterize the materials properties. Performance of the powders in gas sensor applications will be quantified in terms of sensor time response, sensitivity, selectivity and stability. Outcomes of the research include the potential to create mechanically simple, rapid time response, sensitive, selective, stable, toxic-gas sensors that can be operated over a large temperature range. NOx sensors with these properties are a specific focus of the research program due to applications in internal combustion engine systems. The broader impacts therefore include more precise design of automotive exhaust gas catalysts and corresponding materials and costs savings.

提出的研究计划的主要目标是成功地证明使用一种新的合成方法制成的纳米复合SnO2传感器的性能显着提高。利用多元素扩散燃烧器，利用纳米颗粒的分级成核制备掺杂贵金属添加剂的高附加值SnO2传感器材料。特别是，由于在先前的研究中证明了金的极高催化活性，预计金纳米岛将显著提高传感器的灵敏度。因此，Au/SnO2体系将是研究工作的主要重点。颗粒大小、Au负载和相对颗粒形态对传感器性能的影响将被定量确定。高分辨率显微镜成像（如扫描和透射电子显微镜结合元素分析方法）将用于表征材料的性质。粉末在气体传感器应用中的性能将根据传感器时间响应、灵敏度、选择性和稳定性进行量化。这项研究的成果包括创造机械简单、时间响应快速、敏感、选择性、稳定、可在大温度范围内工作的有毒气体传感器的潜力。由于在内燃机系统中的应用，具有这些特性的NOx传感器是研究计划的重点。因此，更广泛的影响包括更精确地设计汽车废气催化剂和相应的材料，并节省成本。