AUTHOR=Masteghin Mateus G. , Godoi Denis R. M. , Orlandi Marcelo O. 

TITLE=Heating Method Effect on SnO Micro-Disks as NO2 Gas Sensor

JOURNAL=Frontiers in Materials

VOLUME=6

YEAR=2019

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2019.00171

DOI=10.3389/fmats.2019.00171

ISSN=2296-8016

ABSTRACT=<p>There is an increasing concern about NO<sub>x</sub> emission, and many studies have been carried out using metal oxide semiconductors (MOS) aiming its detection. Among the MOS, the SnO micro-disks present a high sensor response and a great selectivity toward NO<sub>2</sub>. Nevertheless, sensor signal, limit of detection (LOD), and recovery time are related to the experimental setup used to carry on the measurements. Thus, two different heating methods (<italic>self-heating</italic> and <italic>external heating</italic>) have been carried out to understand in what manner they change the sensor properties of the SnO micro-disks onto interdigitated electrodes. The <italic>external heating</italic> method presented higher sensor signal, best LOD, and lower recovery time, mainly due to the lack of a temperature gradient between the SnO disks and the chamber atmosphere. On the other hand, response time was shown to be the same regardless of the method. Briefly, the authors used thermodynamic equations to better understand the temperature effect on the gas-solid interactions occurring between SnO disks and NO<sub>2</sub> species.</p>