Elaboration and Characterization of SnO2 Doped TiO2 Gas Sensors Deposited through Dip and Spin Coating Methods †
by
, , ,
Zineb Essalhi
1, 
Soufiane Krik
2,*,
Bouchaib Hartiti
1,
Andrea Gaiardo
2,
Abderrazak Lfakir
3,
Matteo Valt
2,
Salah Fadili
1,
Barbara Fabbri
2, 
Maryam Siadat
4 and
Vincenzo Guidi
2 and Philippe Theve 1
ERDyS Laboratory, MEEM&DD Team, Department of Physics, FSTM, University Hassan II Casablanca, 28806 Mohammedia, Morocco
2
Department of Physics and Earth Sciences, University of Ferrara, 44122 Ferrara, Italy
3
Department of Physics, FSTB, University My Slimane, 23030 Béni Mellal, Morocco
4
LCOMS Laboratory, University of Lorraine, 57000 Metz, France
*
Author to whom correspondence should be addressed.
†
Presented at the 8th GOSPEL Workshop. Gas Sensors Based on Semiconducting Metal Oxides: Basic Understanding & Application Fields, Ferrara, Italy, 20–21 June 2019.
Proceedings 2019, 14(1), 23; https://doi.org/10.3390/proceedings2019014023
Published: 19 June 2019
(This article belongs to the Proceedings of The 8th GOSPEL Workshop. Gas Sensors Based on Semiconducting Metal Oxides: Basic Understanding & Application Fields)
Abstract
:Semiconductor functional materials play an increasingly important role in science and technology because of their unique optical, electrical, magnetic, catalytic and chemical properties. They are widely used in fields such as solar cell, photo-catalysts, optical coating, capacitors for large scale integrated devices, electrochromic systems and gas sensors. One important application for semiconductor gas sensors is the detection of pollutant gases for the control of the combustion process.
Published: 19 June 2019
Nanostructured titanium dioxide (TiO2) is a cheap, non-toxic and biodegradable materials that is widely used in industry. For gas sensing application, it can be used as sensing elements for chemoresistive gas sensors. The physical properties of such materials and their electrical performance largely depend on their methods of production. Nowadays, considerable efforts were dedicated to enhance the TiO2 sensing performance, e.g., by adding dopants or metal/metal-oxide decorations in the sensing layer.
In this work, we used sol-gel method associated to spin and dip coating techniques to produce titanium dioxide mixed with tin dioxide (TiO2/SnO2) and pure TiO2 thin films, the concentrations of SnO2 used are 3 and 7%. The samples were mainly characterized by means of X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM).
The SEM characterization highlighted a nanostructured morphology of the films prepared and homogeneous layers of TiO2 and TiO2/SnO2 deposited onto alumina substrates (Figure 1).
The electrical characterization of the sensors produced was performed for two different gases (Ethanol and Ethylene), both in dry air and in presence of different percentages of relative humidity.
Only TiO2/SnO2 (7%) deposited using spin coating technique gave a good response in both dry and wet air, to different concentrations of ethanol (Figure 2). It can be seen from Figure 2 that the sensor gave relatively low gas sensing response to this gas target, but the sensor resulted to be not affected by the presence of the humidity, highlighting about the same response values both in dry and wet air.
Figure 1.
SEM images of synthesized samples ((a) Undoped TiO2 using dip coating (b) SnO2 doped TiO2 using spin coating, (c) Undoped TiO2 using spin coating and (d) SnO2 doped TiO2 using dip coating).
Figure 1.
SEM images of synthesized samples ((a) Undoped TiO2 using dip coating (b) SnO2 doped TiO2 using spin coating, (c) Undoped TiO2 using spin coating and (d) SnO2 doped TiO2 using dip coating).
Figure 2.
Response of TiO2/SnO2 to Ethanol in both dry air and in the presence of relative humidity with .
Figure 2.
Response of TiO2/SnO2 to Ethanol in both dry air and in the presence of relative humidity with .
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MDPI and ACS Style
Essalhi, Z.; Krik, S.; Hartiti, B.; Gaiardo, A.; Lfakir, A.; Valt, M.; Fadili, S.; Fabbri, B.; Siadat, M.; Guidi, V. Elaboration and Characterization of SnO2 Doped TiO2 Gas Sensors Deposited through Dip and Spin Coating Methods. Proceedings 2019, 14, 23. https://doi.org/10.3390/proceedings2019014023
AMA Style
Essalhi Z, Krik S, Hartiti B, Gaiardo A, Lfakir A, Valt M, Fadili S, Fabbri B, Siadat M, Guidi V. Elaboration and Characterization of SnO2 Doped TiO2 Gas Sensors Deposited through Dip and Spin Coating Methods. Proceedings. 2019; 14(1):23. https://doi.org/10.3390/proceedings2019014023
Chicago/Turabian StyleEssalhi, Zineb, Soufiane Krik, Bouchaib Hartiti, Andrea Gaiardo, Abderrazak Lfakir, Matteo Valt, Salah Fadili, Barbara Fabbri, Maryam Siadat, and Vincenzo Guidi. 2019. "Elaboration and Characterization of SnO2 Doped TiO2 Gas Sensors Deposited through Dip and Spin Coating Methods" Proceedings 14, no. 1: 23. https://doi.org/10.3390/proceedings2019014023
