Cheap ultrahigh sensitivity sensors find many applications, hence their development is highly desirable. Here, we report a novel amperometric gas sensor based on the system graphene-ionic liquid-graphite nanopowder that we constructed. Prepared device exhibits response of 90% towards 2 ppm of NO2 in synthetic air and 40% of relative humidity. Short response time of 40 s and recovery time of less than one minute was observed. The variation of the saturation current with the concentration of the analysed gas shows a linear dependence in the range 1-5 ppm with a slope for the calibration curve of 0.2 μA/ppm. Our results thus show that graphite nanopowder can be efficiently used in sensing applications.
Blechta, V., Mergl, M., Drogowska, K., Valeš, V., & Kalbáč, M. (2016). NO2 sensor with a graphite nanopowder working electrode. Sensors and Actuators, B: Chemical, 226, 299–304. https://doi.org/10.1016/j.snb.2015.11.130