Quantitative fluctuation-enhanced sensing in amperometric NO2 sensors
| Autor: | Vlasta Sedlakova, Tomas Kuparowitz, Tomáš Syrový, Lubomír Grmela, Josef Sikula, Petr Kuberský, Petr Sedlak, Jiri Majzner, S. Nešpůrek, Ales Hamacek |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Langmuir
business.industry Chemistry Analytical chemistry General Physics and Astronomy Spectral density Topology (electrical circuits) Noise (electronics) Spectral line chemistry.chemical_compound Optoelectronics Nitrogen dioxide Physical and Theoretical Chemistry Current (fluid) Diffusion (business) business |
| Zdroj: | Chemical Physics. 456:111-117 |
| ISSN: | 0301-0104 |
| DOI: | 10.1016/j.chemphys.2014.10.021 |
| Popis: | Nitrogen dioxide represents threat to human health even at low concentrations. A new amperometric sensor with three-electrode topology (platinum/solid polymer electrolytes/carbon) was developed to overcome limitations of standard solid NO 2 sensors based on inorganic materials. The paper aims to the study of fluctuation phenomena in amperometric sensor and presents preparation technology. The sensor has been exposed to NO 2 concentration from 0 to 3 ppm. Experimental results show that thermal noise is only apparent for zero concentration. For higher NO 2 concentrations, adsorption–desorption (A–D) noise and diffusion noise become main components of current fluctuations, and the noise spectra exhibit Lorentzian-like shape. The spectral density of current noise at frequency 0.2 Hz depends linearly on NO 2 concentration. This linear behavior can be described by adsorption–desorption model for the interaction for two reservoirs. Thus, considering adsorption–desorption noise as a dominant noise source, the noise model is introduced based on Langmuir theory. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect