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Sensors, Vol. 18, Pages 1914: Transilient Response to Acetone Gas Using the Interlocking p+n Field-Effect Transistor Circuit

Sensors, Vol. 18, Pages 1914: Transilient Response to Acetone Gas Using the Interlocking p+n Field-Effect Transistor Circuit

Sensors doi: 10.3390/s18061914

Authors: Xinyuan Zhou Jinxiao Wang Zhou Wang Yuzhi Bian Ying Wang Ning Han Yunfa Chen

Low concentration acetone gas detection is significantly important for diabetes diagnosis as 1.8–10 ppm of acetone exists in exhaled breath from diabetes patients. A new interlocking p+n field-effect transistor (FET) circuit has been proposed for Mn-doped ZnO nanoparticles (MZO) to detect the acetone gas at low concentration, especially close to 1.8 ppm. It is noteworthy that MZO in this interlocking amplification circuit shows a low voltage signal of <0.3 V to the acetone <2 ppm while it displays a transilient response with voltage signal >4.0 V to >2 ppm acetone. In other words, the response to acetone from 1 ppm to 2 ppm increases by ~1233%, which is competent to separate diabetic patients from healthy people. Moreover, the response to 2 ppm acetone is hardly influenced by high relative humidity of 85%. In the meanwhile, MZO in this interlocking circuit possesses a high acetone selectivity compared to formaldehyde, acetaldehyde, toluene and ethanol, suggesting a promising technology for the widespread qualitative screening of diabetes. Importantly, this interlocking circuit is also applicable to other types of metal oxide semiconductor gas sensors. The resistance jump of p- and n-FETs induced by the change of their gate voltages is deemed to make this interlocking circuit produce the transilient response.

Authors:   Zhou, Xinyuan ; Wang, Jinxiao ; Wang, Zhou ; Bian, Yuzhi ; Wang, Ying ; Han, Ning ; Chen, Yunfa
Journal:   Sensors
Volume:   18
edition:   6
Year:   2018
Pages:   1914
DOI:   10.3390/s18061914
Publication date:   12-Jun-2018
Facts, background information, dossiers
  • concentration
  • amplification
  • acetaldehyde
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