| Title: | Non-Gaussian Resistance Fluctuations in Gold-Nanoparticle-Based Gas Sensors: An Appraisal of Different Evaluation Techniques |
| Author(s): | Lentka L; Smulko J; Kotarski M; Granqvist CG; Ionescu R; |
| Address: | "Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland. lukasz.lentka@pg.gda.pl. Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland. jsmulko@eti.pg.gda.pl. Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland. mateusz.kotarski@gmail.com. Department of Engineering Sciences, The Angstrom Laboratory, Uppsala University, P.O. Box 534, SE-75121 Uppsala, Sweden. claes-goran.granqvist@angstrom.uu.se. Rovira i Virgili University, ETSE-DEEEA, Department of Electronics, Carrer de l'Escorxador, 43003 Tarragona, Spain. radu.ionescu@urv.cat" |
| ISSN/ISBN: | 1424-8220 (Electronic) 1424-8220 (Linking) |
| Abstract: | "Volatile organic compounds, such as formaldehyde, can be used as biomarkers in human exhaled breath in order to non-invasively detect various diseases, and the same compounds are of much interest also in the context of environmental monitoring and protection. Here, we report on a recently-developed gas sensor, based on surface-functionalized gold nanoparticles, which is able to generate voltage noise with a distinctly non-Gaussian component upon exposure to formaldehyde with concentrations on the ppm level, whereas this component is absent, or at least much weaker, when the sensor is exposed to ethanol or to pure air. We survey four different statistical methods to elucidate a non-Gaussian component and assess their pros and cons with regard to efficient gas detection. Specifically, the non-Gaussian component was clearly exposed in analysis using level-crossing parameters, which require nothing but a modest computational effort and simple electronic circuitry, and analogous results could be reached through the bispectrum function, albeit with more intense computation. Useful information could be obtained also via the Levy-stable distribution and, possibly, the second spectrum" |
| Keywords: | 1/f noise Levy-stable distribution bispectrum gas sensor gold nanoparticles higher-order statistics level-crossing statistics second spectrum; |
| Notes: | "PubMed-not-MEDLINELentka, Lukasz Smulko, Janusz Kotarski, Mateusz Granqvist, Claes-Goran Ionescu, Radu eng Switzerland 2017/04/04 Sensors (Basel). 2017 Apr 3; 17(4):757. doi: 10.3390/s17040757" |
