SGER: A Novel Gas Sensing Platform with Tin Oxide Nanocrystals Supported on a Carbon Nanotube

SGER：一种新型气体传感平台，采用碳纳米管支撑氧化锡纳米晶体

• 批准号: 0803142
• 负责人: Junhong Chen
• 金额: --
• 依托单位: University of Wisconsin-Milwaukee
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-01 至 2009-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0803142&HistoricalAwards=false
• 关键词: SGER; Novel; Gas; Sensing; Platform

CBET-0803142ChengMiniaturized gas sensors that rapidly and accurately detect and differentiate trace amount of gases/vapors and their mixtures are extremely attractive for many applications, such as environmental monitoring, medical diagnosis, food processing, lab-on-a-chip analytical devices, and control of other industrial processes. The research objective of this proposal is to explore a novel sensing platform of a carbon nanotube (CNT) coated with SnO2 nanocrystals for miniaturized gas sensors. The sensing platform is based on our recent invention in nanoparticle assembly and promises to enable miniaturized gas sensors with superior sensitivity and flexibility to realize selectivity for multisensing capabilities. The new sensing platform based on multiwalled CNTs has been shown to sense low-concentration gases at room temperature, overcoming the well-known disadvantage of SnO2 sensors (high-temperature operation). However, the sensing performance can be significantly enhanced with semiconductor single-walled CNTs (SWCNTs) due to the relatively lower charge carrier density in these tubes. The specific goals of the project are to fabricate gas sensors with SnO2 nanocrystals-SWCNT structures and to characterize the sensing performance of the novel sensors. Effects of nanocrystal size and areal density on hybrid nanostructure properties and the sensor performance will be investigated. Major innovation of the project is the novel gas sensing platform for room-temperature sensing. The hybrid nanocrystal-CNT system as a sensing element is superior to either of the constituent components. The platform provides a radically new opportunity to engineer gas sensors with quantum-mechanical sensing attributes due to electronic coupling between the nanocrystal and the CNT. The proposed approach may enable engineering of a highly efficient single nanoparticle sensor with an ultimate sensitivity of a single molecule and with the advantage of parallel detection of a large array of analyte molecules simply by incorporating different types of nanocrystals, e.g., through doping. Broader impacts of this project are multi-faceted and far-reaching. Miniaturized sensors with superior performance and low power consumption will directly benefit society by enabling a secure and healthy living environment. The new sensing mechanism for the hybrid nanostructure sensor will lead to a new direction for improving sensor performance. The project results will enable a wide range of innovative applications of hybrid nanocrystal-CNT structures. The project will contribute to the training of graduate and undergraduate students in nanotechnology and gas sensing through their participation in the cutting-edge exploratory research and the integration of small nanotechnology projects into an existing core Mechanical Engineering senior experimentation course and a newly developed graduate-level course on nanomanufacturing. It will also contribute to educating K-12 students, teachers, and the general public in the area of nanotechnology through "Science Saturdays" in collaboration with Wisconsin Career Academy. Participation of women and minorities will be encouraged.

CBET-0803142 Cheng微型气体传感器可快速准确地检测和区分痕量气体/蒸汽及其混合物，在许多应用中极具吸引力，如环境监测、医疗诊断、食品加工、芯片实验室分析设备和其他工业过程控制。本计画的研究目的是探索一种以包覆二氧化锡奈米晶的碳奈米管为感测平台的小型化气体感测器。传感平台是基于我们最近的发明在纳米粒子组装和承诺，使小型化的气体传感器具有上级灵敏度和灵活性，实现多传感能力的选择性。基于多壁碳纳米管的新传感平台已被证明可以在室温下检测低浓度气体，克服了SnO 2传感器众所周知的缺点（高温操作）。然而，由于半导体单壁碳纳米管（SWCNT）中相对较低的电荷载流子密度，传感性能可以显着增强。该项目的具体目标是制造具有SnO 2纳米陶瓷-单壁碳纳米管结构的气体传感器，并表征新型传感器的传感性能。将研究纳米尺寸和面密度对混合纳米结构性质和传感器性能的影响。该项目的主要创新是用于室温传感的新型气体传感平台。作为传感元件的混合纳米晶-CNT系统上级任何一种组成成分。该平台提供了一个全新的机会，工程师气体传感器与量子力学传感属性，由于电子耦合之间的碳纳米管和。所提出的方法可以使得能够工程化高效的单个纳米颗粒传感器，其具有单个分子的最终灵敏度，并且具有简单地通过并入不同类型的纳米晶体（例如，通过兴奋剂。该项目的广泛影响是多方面和深远的。具有上级性能和低功耗的微型传感器将通过实现安全和健康的生活环境直接造福社会。混合纳米结构传感器的新的传感机制将导致一个新的方向，提高传感器的性能。该项目的结果将使混合纳米晶-CNT结构的广泛创新应用成为可能。该项目将有助于研究生和本科生在纳米技术和气体传感的培训，通过他们在尖端的探索性研究和小型纳米技术项目的参与整合到现有的核心机械工程高级实验课程和新开发的研究生课程nanomanufacturing。它还将通过与威斯康星州职业学院合作的“科学星期六”，在纳米技术领域为教育K-12学生、教师和公众做出贡献。将鼓励妇女和少数民族的参与。