Sensors: Highly-ordered Nanotube-array Gas Sensors

传感器：高度有序的纳米管阵列气体传感器

• 批准号: 0518269
• 负责人: Craig Grimes
• 金额: $ 29.93万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-15 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0518269&HistoricalAwards=false
• 关键词: Sensors; Highly; ordered; Nanotube; array

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.

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在23C时有1000 ppm的氢有氢的情况下，电阻变化超过108（10,000,000,000％）。 在任何温度下，电阻的这种动态变化是任何材料对任何气体的最大已知响应。传感器显示完整的可逆性，几秒钟的响应时间以及没有测量漂移。 纳米管的纳米级结构，尤其是壁厚和管子到管接触的点，据信负责出色的气体敏感性。 实现这种物质气体的反应是一个了不起的科学结果，对传感器社区具有重要意义。纳米管阵列结构提供了路线图，可以通过该路线图制造其他精致灵敏度的气体传感器。由于不需要加热元件来提高灵敏度，因此与金属氧化物气体传感器一样，纳米管阵列在低功率传感器网络监测应用中具有巨大的使用潜力。此外，纳米管阵列的几何形状产生了显着的光转化效率，通常约为12％，因此，在暴露于光线时，传感器能够从污染中自我清洁长期监测能力，从而实现长期监测能力。拟议的研究在传感领域中具有广泛的材料，包括特定的材料，包括特定的范围：1;可以实现各种精致灵敏度的气体传感器。 因此，这项研究将对高性能，低功率化学传感器的发展产生重大科学影响。 {2}该研究将对新一代高性能氢传感器的发展产生重大影响，对从能源，工业生产到改善医疗保健的应用都具有有益的结果。 {3}研究将提供高质量的跨学科研究生教育。 {4}该研究将为本科生提供面向外展的实验室实习。