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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of donor density on power-law response in tin dioxide gas sensors

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Author(s):
Mirabella, D. A. [1, 2] ; Desimone, P. M. [1, 2] ; Ponce, M. A. [1, 2] ; Aldao, C. M. [1, 2] ; da Silva, L. F. [3] ; Catto, A. C. [3] ; Longo, E. [4]
Total Authors: 7
Affiliation:
[1] Univ Mar Del Plata, Inst Mat Sci & Technol INTEMA, Juan B Justo 4302, B7608FDQ, Mar Del Plata - Argentina
[2] Natl Res Council CONICET, Juan B Justo 4302, B7608FDQ, Mar Del Plata - Argentina
[3] Univ Fed Sao Carlos, Dept Phys, Lab Nanostruct Multifunct Mat, BR-13565905 Sao Carlos, SP - Brazil
[4] Fed Univ Sao Carlos UFSCar, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 329, FEB 15 2021.
Web of Science Citations: 1
Abstract

We investigated the power-law responses in two types of tin dioxide (SnO2) films: one made from nanosized grains and another from from very large grains, both under dry air. Experimental results revealed a significant dependence between the sensitivity and the SnO2 grain size. We therefore propose, that the gas sensor sensitivity is not only determined by oxygen chemisorption, but also by changes in the density of oxygen vacancies in response to changes in the ambient gas pressure. Band bendings and adsorbate coverages for different oxygen pressures were derived resorting to the electroneutrality condition, including changes in the concentration of oxygen vacancies within the grains due to the exposure to different oxygen pressure. The consequences for the film conductivity and its power-law response were analyzed and compared with experimental results. (AU)

FAPESP's process: 18/18208-0 - a-Fe2O3/g-C3N4 Heterostructures: Preparation, Characterization and Gas-sensing Properties
Grantee:Ariadne Cristina Catto
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 17/12437-5 - Preparation and characterization of semiconductor nanoheterojunctions applied in photoactived gas sensors
Grantee:Luís Fernando da Silva
Support Opportunities: Regular Research Grants