Passive wireless surface acoustic wave sensors for monitoring sequestration sites CO2 emission

Wang, Yizhong¹  Chyu, Minking¹  Wang, Qing-Ming¹ 

[1]Univ. of Pittsburgh, PA (United States)

DOI  :  10.2172/1164224
RP-ID  :  None
PID  :  OSTI ID: 1164224

美国|英语

来源: SciTech Connect

【 摘 要 】

University of Pittsburgh???s Transducer lab has teamed with the U.S. Department of Energy???s National Energy Technology Laboratory (DOE NETL) to conduct a comprehensive study to develop/evaluate low-cost, efficient CO₂ measuring technologies for geological sequestration sites leakage monitoring. A passive wireless CO₂ sensing system based on surface acoustic wave technology and carbon nanotube nanocomposite was developed. Surface acoustic wave device was studied to determine the optimum parameters. Delay line structure was adopted as basic sensor structure. CNT polymer nanocomposite was fabricated and tested under different temperature and strain condition for natural environment impact evaluation. Nanocomposite resistance increased for 5 times under pure strain, while the temperature dependence of resistance for CNT solely was -1375ppm/?��C. The overall effect of temperature on nanocomposite resistance was -1000ppm/?��C. The gas response of the nanocomposite was about 10% resistance increase under pure CO₂ . The sensor frequency change was around 300ppm for pure CO₂ . With paralyne packaging, the sensor frequency change from relative humidity of 0% to 100% at room temperature decreased from over 1000ppm to less than 100ppm. The lowest detection limit of the sensor is 1% gas concentration, with 36ppm frequency change. Wireless module was tested and showed over one foot transmission distance at preferred parallel orientation.