Journal Home > Volume 8 , Issue 2
Journal of Advanced Ceramics 2019, 8(2): 238-246 https://doi.org/10.1007/s40145-018-0309-x
Research Article | Open Access | Issue | Published: 13 June 2019

TiO2/WO3 heterogeneous structures prepared by electrospinning and sintering steps: Characterization and analysis of the impedance variation to humidity

Show Author's Information Evando S. ARAÚJO( ),  Victor N. S. LEÃO
Research Group on Electrospinning and Nanotechnology Applications (GPEA-Nano), Department of Materials Science, Universidade Federal do Vale do São Francisco, 48902-300, Juazeiro-BA, Brazil
Keywords:
electrospinning, heterogeneous structures, preparation, relative humidity, semiconductors
Cite this article:
ARAÚJO ES, LEÃO VNS. TiO2/WO3 heterogeneous structures prepared by electrospinning and sintering steps: Characterization and analysis of the impedance variation to humidity. Journal of Advanced Ceramics, 2019, 8(2): 238-246. https://doi.org/10.1007/s40145-018-0309-x
Download citation
EndNote(RIS)
BibTeX

360

Views

12

Downloads

Citations

19

Crossref

N/A

WoS

18

Scopus

0

CSCD

Abstract Full text About this article

Relative humidity (RH) is a critical environmental variable for transportation and storage of products and for the quality guarantee of several other production processes and services. Heterogeneous structures prepared from the selective semiconductor oxides may improve the sensitivity to humidity due to the better electronic and surface properties, when compared to pristine oxides. This work shows an alternative fabrication route for producing titanium dioxide/tungsten trioxide (TiO2/WO3) heterogeneous structures (by electrospinning and sintering) for potential application on the RH detection. The microstructural properties of the materials were analyzed by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS), X-ray diffraction, and Raman spectroscopy. The electrical characterization of the structures was performed by electrical impedance spectroscopy in RH range of 10%-100%. Results indicated a p-to n-type conduction transition at around 30%-40% RH for all tested settings. The analysis of the impedance signature to humidity showed that the amount of fiber layers on the electrode and working temperature are important parameters to improve the humidity sensing of the TiO2/WO3 systems.


menu
Abstract
Full text
Outline
About this article

TiO2/WO3 heterogeneous structures prepared by electrospinning and sintering steps: Characterization and analysis of the impedance variation to humidity

Show Author's information Evando S. ARAÚJO( ), Victor N. S. LEÃO
Research Group on Electrospinning and Nanotechnology Applications (GPEA-Nano), Department of Materials Science, Universidade Federal do Vale do São Francisco, 48902-300, Juazeiro-BA, Brazil

Abstract

Relative humidity (RH) is a critical environmental variable for transportation and storage of products and for the quality guarantee of several other production processes and services. Heterogeneous structures prepared from the selective semiconductor oxides may improve the sensitivity to humidity due to the better electronic and surface properties, when compared to pristine oxides. This work shows an alternative fabrication route for producing titanium dioxide/tungsten trioxide (TiO2/WO3) heterogeneous structures (by electrospinning and sintering) for potential application on the RH detection. The microstructural properties of the materials were analyzed by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS), X-ray diffraction, and Raman spectroscopy. The electrical characterization of the structures was performed by electrical impedance spectroscopy in RH range of 10%-100%. Results indicated a p-to n-type conduction transition at around 30%-40% RH for all tested settings. The analysis of the impedance signature to humidity showed that the amount of fiber layers on the electrode and working temperature are important parameters to improve the humidity sensing of the TiO2/WO3 systems.

Keywords: electrospinning, heterogeneous structures, preparation, relative humidity, semiconductors

References(35)

[1]
H Farahani, R Wagiran, MN Hamidon. Humidity sensors principle, mechanism, and fabrication technologies: A comprehensive review. Sensors 2014, 14: 7881-7939.
DOI Google Scholar
[2]
ES Araújo, BP da Costa, RAP Oliveira, et al. TiO2/ZnO hierarchical heteronanostructures: Synthesis, characterization and application as photocatalysts. J Environ Chem Eng 2016, 4: 2820-2829.
DOI Google Scholar
[3]
PM Faia, AJ Ferreira, CS Furtado. Investigations on humidity sensing properties of thick films of the TiO2:WO3 system. Materials Science Forum 2010, 636-637: 307-314.
DOI Google Scholar
[4]
D Zhang, H Chang, P Li, et al. Fabrication and characterization of an ultrasensitive humidity sensor based on metal oxide/graphene hybrid nanocomposite. Sensor Actuat B: Chem 2016, 225: 233-240.
DOI Google Scholar
[5]
D Zhang, J Liu, B Xia. Layer-by-layer self-assembly of zinc oxide/graphene oxide hybrid toward ultrasensitive humidity sensing. IEEE Electron Device Lett 2016, 37: 916-919.
DOI Google Scholar
[6]
D Zhang, Y Sun, P Li, et al. Facile fabrication of MoS2-modified SnO2 hybrid nanocomposite for ultrasensitive humidity sensing. ACS Appl Mater Interfaces 2016, 8: 14142-14149.
DOI Google Scholar
[7]
D Zhang, J Tong, B Xia. Humidity-sensing properties of chemically reduced graphene oxide/polymer nanocomposite film sensor based on layer-by-layer nano self-assembly. Sensor Actuat B: Chem 2014, 197: 66-72.
DOI Google Scholar
[8]
D Zhang, J Tong, B Xia, et al. Ultrahigh performance humidity sensor based on layer-by-layer self-assembly of graphene oxide/polyelectrolyte nanocomposite film. Sensor Actuat B: Chem 2014, 203: 263-270.
DOI Google Scholar
[9]
PM Faia, EL Jesus, CS Louro. TiO2:WO3 composite humidity sensors doped with ZnO and CuO investigated by impedance spectroscopy. Sensor Actuat B: Chem 2014, 203: 340-348.
DOI Google Scholar
[10]
PM Faia, J Libardi, CS Louro. Effect of V2O5 doping on p-to n-conduction type transition of TiO2:WO3 composite humidity sensors. Sensor Actuat B: Chem 2016, 222: 952-964.
DOI Google Scholar
[11]
MLF Nascimento, ES Araujo, ER Cordeiro, et al. A literature investigation about electrospinning and nanofibers: Historical trends, current status and future challenges. Recent Pat Nanotech 2015, 9: 76-85.
DOI Google Scholar
[12]
ES Araújo, J Libardi, PM Faia, et al. Humidity-sensing properties of hierarchical TiO2:ZnO composite grown on electrospun fibers. J Mater Sci: Mater El 2017, 28: 16575-16583.
DOI Google Scholar
[13]
FFP Da Costa, ES Araújo, MLF Nascimento, et al. Electrospun fibers of enteric polymer for controlled drug delivery. Int J Polym Sci 2015, 2015: 1-8.
DOI Google Scholar
[14]
SA Weissman, NG Anderson. Design of experiments (DoE) and process optimization. A review of recent publications. Org Process Res Dev 2015, 19: 1605-1633.
DOI Google Scholar
[15]
VA Fonoberov, AA Balandin. Interface and confined optical phonons in wurtzite nanocrystals. Phys Rev B 2004, 70: 233205.
DOI Google Scholar
[16]
GR Hearne, J Zhao, AM Dawe, et al. Effect of grain size on structural transitions in anataseTiO2: A Raman spectroscopy study at high pressure. Phys Rev B 2004, 70: 134102.
DOI Google Scholar
[17]
S Sahoo, AK Arora, V Sridharan. Raman line shapes of optical phonons of different symmetries in anatase TiO2 nanocrystals. J Phys Chem C 2009, 113: 16927-16933.
DOI Google Scholar
[18]
M Horprathum, P Eiamchai, P Chindaudom, et al. Oxygen partial pressure dependence of the properties of TiO2 thin films deposited by DC reactive magnetron sputtering. Procedia Eng 2012, 32: 676-682.
DOI Google Scholar
[19]
M Landmann, E Rauls, WG Schmidt. The electronic structure and optical response of rutile, anatase and brookite TiO2. J Phys: Condens Matter 2012, 24: 195503.
DOI Google Scholar
[20]
CC Yang, S Li. Size-dependent Raman red shifts of semiconductor nanocrystals. J Phys Chem B 2008, 112: 14193-14197.
DOI Google Scholar
[21]
CY Su, HC Lin, CK Lin. Fabrication and optical properties of Ti-doped W18O49 nanorods using a modified plasma-arc gas-condensation technique. J Vac Sci Technol B 2009, 27: 2170-2174.
DOI Google Scholar
[22]
JJ Fripiat, A Jelli, G Poncelet, et al. Thermodynamic properties of adsorbed water molecules and electrical conduction in montmorillonites and silicas. J Phys Chem 1965, 69: 2185-2197.
DOI Google Scholar
[23]
JH Anderson, GA Parks. Electrical conductivity of silica gel in the presence of adsorbed water. J Phys Chem 1968, 72: 3662-3668.
DOI Google Scholar
[24]
JR Macdonald. Impedance Spectroscopy. New york: John Wiley & Sons, 1987.
[25]
W Geng, Q Yuan, X Jiang, et al. Humidity sensing mechanism of mesoporous MgO/KCl-SiO2 composites analyzed by complex impedance spectra and bode diagrams. Sensor Actuat B: Chem 2012, 174: 513-520.
DOI Google Scholar
[26]
JE Bauerle. Study of solid electrolyte polarization by a complex admittance method. J Phys Chem Solids 1969, 30: 2657-2670.
DOI Google Scholar
[27]
W Mönch. Semiconductor Surfaces and Interfaces. Berlin, Heidelberg: Springer Science & Business Media, 2001.
DOI
[28]
A Gurlo, M Sahm, A Oprea, et al. A p-to n-transition on α-Fe2O3-based thick film sensors studied by conductance and work function change measurements. Sensor Actuat B: Chem 2004, 102: 291-298.
DOI Google Scholar
[29]
N Bârsan, R Grigorovici, R Ionescu, et al. Mechanism of gas detection in polycrystalline thick film SnO2 sensors. Thin Solid Films 1989, 171: 53-63.
DOI Google Scholar
[30]
M Bayhan, N Kavasoğlu. A study on the humidity sensing properties of ZnCr2O4-K2CrO4 ionic conductive ceramic sensor. Sensor Actuat B: Chem 2006, 117: 261-265.
DOI Google Scholar
[31]
N Agmon. The Grotthuss mechanism. Chem Phys Lett 1995, 244: 456-462.
DOI Google Scholar
[32]
Information on http://www.kesarcontrol.com/humidity.html.
[33]
TDK Humidity Sensor CHS Series. Information on http://pdf.directindustry.com/pdf/tdk-electronics-europe/humidity-sensor-chs-series/34778-654990.html.
DOI
[34]
Vent-Axia Ecotronic Humidity Sensor. Information on https://www.vent-axia.com/product/ecotronic-humidity-sensor.
DOI
[35]
K Suri, S Annapoorni, A Sarkar, et al. Gas and humidity sensors based on iron oxide-polypyrrole nanocomposites. Sensor Actuat B: Chem 2002, 81: 277-282.
Google Scholar
Publication history
Copyright
Acknowledgements
Rights and permissions

Publication history

Received: 06 July 2018
Revised: 25 November 2018
Accepted: 05 December 2018
Published: 13 June 2019
Issue date: June 2019

Copyright

© The author(s) 2019

Acknowledgements

The corresponding author would like to thank Drs. Helinando Oliveira, Pedro Faia, Juliano Libardi, and Pedro Dicesar for the technical support. The authors also acknowledge the financial support from National Council for Scientific and Technological Development (CNPq - Brazil, Project 202451/2015-1) and Bahia State Research Foundation (FAPESB, Project 1252/2018).

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.

To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Return