Noise in amperometric NO2 sensor

• Published in: 2013 22nd International Conference on Noise and Fluctuations (ICNF) pp. 1 - 4
• Main Authors: Sedlak, Petr, Sikula, Josef, Sedlakova, Vlasta, Chvatal, Milos, Majzner, Jiri, Vondra, Marek, Kubersky, Petr, Nespurek, Stanislav, Hamacek, Ales
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-06-2013
• Subjects: amperometric gas sensor; Chemicals; Electrodes; Fluctuations; generation-recombination noise; nitrogen dioxide; Noise; Noise measurement; Polymers; solid polymer electrolyte; Solids
• ISBN: 1479906689; 9781479906680
• DOI: 10.1109/ICNF.2013.6578904

Nitrogen dioxide (NO 2 ) is a highly toxic gas harmful to the environment, which can be threat to human health even at low concentrations. To overcome limitations of standard solid NO 2 sensors based on inorganic materials, a new sensor with solid polymer electrolytes (SPE) was developed. Our study deals with investigation of fluctuation phenomena in the electrochemical NO 2 sensor, which is based on three-electrode topology and solid polymer electrolyte. Experimental result shows that generation-recombination (G-R) noise seems to be main components of current fluctuations in this sensor. The concentration of detected matter affects noise spectral density of sensor. As the concentration increases, G-R noise rises and is supposed to be connected with chemical processes on active layer of sensor. The shift of G-R component is supposed to be caused by increased flux density between active layer and environment.