Sensors: Highly-ordered Nanotube-array Gas Sensors

摘要提案题目：传感器：高有序纳米管阵列气体传感器提案编号：cct - 05182669首席研究员：Craig GrimesInstitution：宾夕法尼亚州立大学Park分析（决策依据）：基于高有序钛纳米管阵列的氢传感器，通过在酸性溶液中阳极氧化钛箔片制成，在23℃下1000 ppm氢气存在下，其电阻变化超过108（10,000,000,000%）。这种电阻的动态变化是已知的任何材料对任何气体在任何温度下的最大响应。该传感器具有完全可逆性，响应时间为几秒，且无测量漂移。纳米管的纳米级结构，特别是壁厚和管对管的接触点，被认为是杰出的气体灵敏度的原因。实现这样的物质-气体响应是一项了不起的科学成果，对传感器界具有重要意义。纳米管阵列结构提供了一个路线图，通过它可以制造其他灵敏度很高的气体传感器。由于不需要加热元件来提高灵敏度，与金属氧化物气体传感器一样，纳米管阵列在低功耗传感器网络监测应用中具有巨大的潜力。此外，纳米管阵列的几何形状产生了显著的光转换效率，通常约为12%，因此，在暴露于光下，传感器能够自清洁污染，从而实现长期监测能力。虽然所提出的研究在传感领域具有广泛的实用性，但具体的更广泛的影响包括：{1}高度有序的纳米管阵列材料结构提供了一个路线图，通过该路线图可以实现各种灵敏度高的气体传感器。因此，该研究将对高性能、低功耗化学传感器的发展产生重大的科学影响。这项研究将对新一代高性能氢传感器的开发产生重大影响，对从能源、工业生产到改善医疗保健等领域的应用产生有益的结果。b{3}该研究将提供高质量、跨学科的研究生教育。b{4}本研究将为本科生提供外联的实验室实习机会。

AbstractProposal Title: Sensors: Highly-ordered Nanotube-array Gas Sensors Proposal Number: CTS-0518269Principal Investigator: Craig GrimesInstitution: Pennsylvania State Univ University Park Analysis (rationale for decision):Hydrogen sensors based upon highly ordered titania nanotube arrays, made by anodizing a starting piece of titanium foil in an acidic solution, exhibit a resistance variation of over 108 (10,000,000,000%) in the presence of 1000 ppm hydrogen at 23C. This dynamic change in electrical resistance is the largest known response of any material, to any gas, at any temperature. The sensors demonstrate complete reversibility, response times of a few seconds, and no measurement drift. The nanoscale architecture of the nanotubes, in particular the wall thickness and points of tube-to-tube contact, is believed responsible for the outstanding gas sensitivity. To achieve such a material-gas response is a remarkable scientific result, and of great significance to the sensor community. The nanotube-array architecture provides a roadmap by which other gas sensors of exquisite sensitivity can be fabricated. Since no heating element is required to improve sensitivity, as is common with metal oxide gas sensors, the nanotube arrays have a tremendous potential for use in low-power sensor network monitoring applications. Furthermore, the nanotube-array geometry gives rise to remarkable photoconversion efficiencies, generally about 12%, hence upon exposure to light the sensors are able to self-clean from contamination enabling long term monitoring capabilities.While the proposed research has broad utility in the sensing field, specific broader impacts include: {1} The highly-ordered nanotube-array material architecture provides a roadmap by which a variety of gas sensors of exquisite sensitivity can be realized. Consequently, the research will have significant scientific impact in the development of high performance, low power chemical sensors. {2} The research will have a significant impact in the development of a new generation of high performance hydrogen sensors, with beneficial results to applications ranging from energy, industrial production, to improved health care. {3} The research will provide high quality, interdisciplinary graduate student education. {4} The research will provide outreach-oriented laboratory internships for undergraduates.