P1AP.16 - Development of NO2 Gas Sensor Using Colorimetric Film and Organic Solar Cell in Self-powered System

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-1 - Applications of Chemical Sensors
K. Kang, I. Parkr - Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon (South Korea), K. Na, J. Lee - Graduate school of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon (South Korea)
466 - 467


This paper demonstrates the fabrication of a self-powered NO2 gas sensor using a visible light source. This sensor is composed of a N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) colorimetric film on top of an organic photovoltaic cell. The TMPD colorimetric material changes its color when it is exposed to NO2. Based on this transmittance change, the output current from the solar cell beneath the film is used to build a gas detection system. Conventional colorimetric gas sensors use a singlewavelength light source and a detector. However, the sensor system in this report uses a visible light source (to emulate ambient light), thereby avoiding the use of additional power sources for the sensor. To increase the sensitivity of the device, a micro post array (with 20 μm in diameter) was formed on the sensing film. The larger the aspect ratio of the micro post, the better the performance of the sensor. Further enhancement of the performance was observed by incorporating nanowires on the micro post. NO2 gas was successfully detected at concentrations of 1 ~ 20 ppm with this system. By
modularizing this sensor, users can easily detect gases that threaten their personal health without the inconvenience of replacing a battery.