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Sensors 2017, 17(1), 194; doi:10.3390/s17010194

1-Butyl-3-Methylimidazolium Tetrafluoroborate Film as a Highly Selective Sensing Material for Non-Invasive Detection of Acetone Using a Quartz Crystal Microbalance

1
Shenzhen Key Laboratory of Special Functional Materials & Shenzhen Engineering Laboratory for Advance Technology of Ceramics, College of Materials Science and Engineering, Shenzhen University, Shenzhen 510081, China
2
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
3
Department of Biomedical Engineering, the Chinese University of Hong Kong, Shatin, Hong Kong 999077, China
4
College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410082, China
*
Authors to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 4 December 2016 / Revised: 8 January 2017 / Accepted: 13 January 2017 / Published: 20 January 2017
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [1776 KB, uploaded 20 January 2017]   |  

Abstract

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. View Full-Text
Keywords: 1-butyl-3-methylimidazolium tetrafluoroborate; acetone; quartz crystal microbalance; non-invasive sensing 1-butyl-3-methylimidazolium tetrafluoroborate; acetone; quartz crystal microbalance; non-invasive sensing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tao, W.; Lin, P.; Liu, S.; Xie, Q.; Ke, S.; Zeng, X. 1-Butyl-3-Methylimidazolium Tetrafluoroborate Film as a Highly Selective Sensing Material for Non-Invasive Detection of Acetone Using a Quartz Crystal Microbalance. Sensors 2017, 17, 194.

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