Journal
SENSORS
Volume 17, Issue 1, Pages -Publisher
MDPI AG
DOI: 10.3390/s17010194
Keywords
1-butyl-3-methylimidazolium tetrafluoroborate; acetone; quartz crystal microbalance; non-invasive sensing
Funding
- National Natural Science Foundations of China [21405106, 51302172, 51272161]
- Foundation for Distinguished Young Talents in Higher Education of Guangdong, China [2014KQNCX130]
- Special Research Foundation of Shenzhen Oversea High-level Talents for Innovation and Entrepreneurship [KQCX20140519103821737]
- Natural Science Foundation of Shenzhen University [00002201, 201461]
- Research and Development Foundation of Science and Technology of Shenzhen [JCYJ20150324141711592]
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Breath acetone serves as a biomarker for diabetes. This article reports 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]), a type of room temperature ionic liquid (RTIL), as a selective sensing material for acetone. The RTIL sensing layer was coated on a quartz crystal microbalance (QCM) for detection. The sensing mechanism is based on a decrease in viscosity and density of the [bmim][BF4] film due to the solubilization of acetone leading to a positive frequency shift in the QCM. Acetone was detected with a linear range from 7.05 to 750 ppmv. Sensitivity and limit of detection were found to be 3.49 Hz/ppmv and 5.0 ppmv, respectively. The [bmim][BF4]-modified QCM sensor demonstrated anti-interference ability to commonly found volatile organic compounds in breath, e.g., isoprene, 1,2-pentadiene, d-limonene, and dl-limonene. This technology is useful for applications in non-invasive early diabetic diagnosis.
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