NO2 Sensor with a Graphite Nanopowder Working Electrode

0452649 - ÚFCH JH 2017 RIV CH eng J - Journal Article
Blechta, Václav - Mergl, Martin - Drogowska, Karolina - Valeš, Václav - Kalbáč, Martin
NO2 Sensor with a Graphite Nanopowder Working Electrode.
Sensors and Actuators B - Chemical. Roč. 226, APR 2016 (2016), s. 299-304. E-ISSN 0925-4005
R&D Projects: GA ČR GBP208/12/G016
Institutional support: RVO:61388955
Keywords : graphene * graphite nanopowder * ionic liquid
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 5.401, year: 2016

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.
Permanent Link: http://hdl.handle.net/11104/0253654