TY - JOUR
T1 - Silver enhances hematite nanoparticles based ethanol sensor response and selectivity at room temperature
AU - Garcia-Osorio, Daniel
AU - Hidalgo-Falla, Pilar
AU - Peres, Henrique E.M.
AU - Gonçalves, Josue M.
AU - Araki, Koiti
AU - Garcia-Segura, Sergi
AU - Picasso, Gino
N1 - Funding Information:
Funding: This work was partially supported by FONDECYT (grant 237-2015.FONDECYT). The authors also are grateful to the Brazilian agencies “Conselho Nacional de Desenvolvimento Científico e Tecnológico” (CNPq) and “Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for the financial support (CNPq 401581/2016-0, FAPESP 2013/24725-4) and fellowships (JMG CNPq 141853/2015-8, FAPESP 2018/16896-7). D. Garcia-Osorio acknowledges CNPq for the fellowship (CNPq 131863/2016-9). The authors are also grateful to Brazilian Nanotechnology National Laboratory—LNNano/CNPEM (Campinas, Brazil) by the use of the STEM facilities.
Funding Information:
This work was partially supported by FONDECYT (grant 237-2015.FONDECYT). The authors also are grateful to the Brazilian agencies ?Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico? (CNPq) and ?Funda??o de Amparo ? Pesquisa do Estado de S?o Paulo (FAPESP) for the financial support (CNPq 401581/2016-0, FAPESP 2013/24725-4) and fellowships (JMG CNPq 141853/2015-8, FAPESP 2018/16896-7). D. Garcia-Osorio acknowledges CNPq for the fellow-ship (CNPq 131863/2016-9). The authors are also grateful to Brazilian Nanotechnology National Laboratory?LNNano/CNPEM (Campinas, Brazil) by the use of the STEM facilities.
Publisher Copyright:
© 2021 by the authors. Li-censee MDPI, Basel, Switzerland.
PY - 2021/1/2
Y1 - 2021/1/2
N2 - Gas sensors are fundamental for continuous online monitoring of volatile organic com-pounds. Gas sensors based on semiconductor materials have demonstrated to be highly competitive, but are generally made of expensive materials and operate at high temperatures, which are draw-backs of these technologies. Herein is described a novel ethanol sensor for room temperature (25◦C) measurements based on hematite (α-Fe2O3 )/silver nanoparticles. The AgNPs were shown to increase the oxide semiconductor charge carrier density, but especially to enhance the ethanol adsorption rate boosting the selectivity and sensitivity, thus allowing quantification of ethanol vapor in 2–35 mg L−1 range with an excellent linear relationship. In addition, the α-Fe2O3/Ag 3.0 wt% nanocomposite is cheap, and easy to make and process, imparting high perspectives for real applications in breath analyzers and/or sensors in food and beverage industries. This work contributes to the advance of gas sensing at ambient temperature as a competitive alternative for quantification of conventional volatile organic compounds.
AB - Gas sensors are fundamental for continuous online monitoring of volatile organic com-pounds. Gas sensors based on semiconductor materials have demonstrated to be highly competitive, but are generally made of expensive materials and operate at high temperatures, which are draw-backs of these technologies. Herein is described a novel ethanol sensor for room temperature (25◦C) measurements based on hematite (α-Fe2O3 )/silver nanoparticles. The AgNPs were shown to increase the oxide semiconductor charge carrier density, but especially to enhance the ethanol adsorption rate boosting the selectivity and sensitivity, thus allowing quantification of ethanol vapor in 2–35 mg L−1 range with an excellent linear relationship. In addition, the α-Fe2O3/Ag 3.0 wt% nanocomposite is cheap, and easy to make and process, imparting high perspectives for real applications in breath analyzers and/or sensors in food and beverage industries. This work contributes to the advance of gas sensing at ambient temperature as a competitive alternative for quantification of conventional volatile organic compounds.
KW - Alcohol sensor
KW - Hematite (α-FeO )
KW - Metal oxide gas sensors
KW - Nano-enabled gas sensors
KW - Silver decorated hematite
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UR - http://www.scopus.com/inward/citedby.url?scp=85099206012&partnerID=8YFLogxK
U2 - 10.3390/s21020440
DO - 10.3390/s21020440
M3 - Article
C2 - 33435484
AN - SCOPUS:85099206012
SN - 1424-8220
VL - 21
SP - 1
EP - 13
JO - Sensors (Switzerland)
JF - Sensors (Switzerland)
IS - 2
M1 - 440
ER -