SGER: Investigation of High Temperature Resonant Gas Sensor

SGER：高温谐振气体传感器的研究

• 批准号: 0228787
• 负责人: Harry Tuller
• 金额: $ 6万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-15 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0228787&HistoricalAwards=false
• 关键词: SGER; Investigation; Temperature; Resonant; Gas

The feasibility of extending the operation of highly sensitive resonant-based gas sensors to elevated temperatures will be investigated. Towards this end, the electrical, resonant and mass transport properties of langasite, a piezoelectric material stable to elevated temperatures, will be characterized as functions of temperature, oxygen partial pressure and cation composition. The defect model, to be developed and based on these results, will be used to modify langasite in order to maintain high Q values and compositional stability to elevated temperatures thereby insuring high sensitivity. Means for isolating thermal and stress cross effects will be investigated and implemented. Gas sensitive films (PrxCe1-xO2-?, and ZnO) will be deposited on langasite by pulse laser deposition with varying thickness and microstructure. Sensitivity and response time will be correlated to film stoichiometry, thickness and grain morphology. Parallel monitoring of film stoichiometry and resistivity with temperature and pO2 will provide further insights into gas-solid interactions.Bulk and surface acoustic wave resonant devices exhibit exceptional sensitivity to a wide range of chemical and biological species when coated with appropriate species-sensitive films but are typically limited to room temperature operation. In this program, the electrical and mass transport properties of langasite, a piezoelectric material stable to elevated temperatures, are modeled and investigated to elevated temperatures and in controlled atmospheres. Understanding gained from these studies, will enable the operation of this multifunctional resonant sensor platform to elevated temperatures and thereby address the need for improved sensors in the transportation, industrial process and energy industries. This proposal was submitted in response to the Dear Colleague Letter: Next Generation Chemical and Biological Sensors and Sensing Systems [nsf 02-112].

将研究将高灵敏度的基于谐振的气体传感器的操作扩展到升高的温度的可行性。为此，硅酸镧镓，一种压电材料，稳定的高温下的电，共振和质量传输性能，将其特征在于作为温度，氧分压和阳离子组成的函数。 缺陷模型，开发和基于这些结果，将被用来修改硅酸镓镧，以保持高Q值和组成的稳定性，以提高温度，从而确保高灵敏度。将研究和实施隔离热效应和应力交叉效应的方法。气敏薄膜（PrxCe 1-xO 2-？，和ZnO）将通过脉冲激光沉积以不同的厚度和微观结构沉积在硅酸镓镧上。 灵敏度和响应时间将与膜的化学计量、厚度和晶粒形态相关。平行监测膜的化学计量和电阻率与温度和pO 2将提供进一步的见解到气-固interactions.Bulk和表面声波谐振器件表现出卓越的灵敏度，以广泛的化学和生物物种时，涂有适当的物种敏感膜，但通常限于室温操作。在这个程序中，电气和质量传输特性的硅酸镧镓，压电材料稳定的高温下，建模和研究高温和受控气氛。从这些研究中获得的理解将使这种多功能谐振传感器平台能够在高温下运行，从而满足运输，工业过程和能源行业对改进传感器的需求。 本提案是为了回应《致同事的信：下一代化学和生物传感器及传感系统》[nsf 02-112]而提交的。