期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 262, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2021.124291
关键词
Sol-gel; Cobalt chromite thick film; Chemoresistive gas sensor; Trace acetone sensor; Exhaled breath analysis
资金
- Science and Engineering Research Board (SERB), Government of India under Empowerment and Equity Opportunities for Excellence in Science scheme [EEQ/2016/000190]
- Council of Scientific and Industrial Research, Ministry of Science and Technology, Government of India [MLP0308]
This study presented a highly sensitive and stable cobalt chromite thick film-based trace acetone sensor with quick response and recovery times, showing great potential for diabetes detection. The sensor exhibited a high p-type response to acetone vapor, good resolution between different concentrations, and fast response and recovery times. It also showed stability and repeatability in measurements.
Acetone is known as the breath biomarker of diabetes. In this paper we have reported on a highly sensitive, stable cobalt chromite (CoCr2O4) thick film-based trace acetone sensor with quick response and recovery times promising for the detection of diabetes from exhaled breath. CoCr2O4 nanoparticles were prepared by a cost-effective and easy sol-gel method. The as prepared nanoparticles were well characterized by sophisticated characterization techniques, such as, XRD, FESEM. TEM, HRTEM, XPS, and BET. Further these nanoparticles were exploited to fabricate a Taguchi type chemoresistive sensor using a customized drop coater. The developed sensor was characterized by I-V measurement. The developed sensor exhibited high p-type response towards 1 ppm of acetone vapor (similar to 3.81 folds), and appreciable resolution between 1 ppm, 2 ppm (response = similar to 4.82 folds), and 5 ppm (response = similar to 6.64 folds) acetone vapor at 300 degrees C. Further, the sensor exhibited fast response and recovery times of similar to 1.65 s and similar to 62 s, respectively. Also, the response of the sensor to 1 ppm acetone vapor is appreciably higher than that of 0.2 ppm ethanol, 0.25 ppm ammonia vapor, and saturated moisture. Finally, the sensor is stable for at least 6 months and exhibits repeatable measurements.
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