Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed Powders
The study of selective metal oxide-based binary/ternary systems has received increasing interest in recent years due to the possibility of producing efficient new ceramic materials for relative humidity (RH) detection, given the superior properties of the mixed compounds in comparison with pristine...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2017/2808262 |
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| author | Pedro M. Faia Juliano Libardi Itamar Barbosa Evando S. Araújo Helinando P. de Oliveira |
| author_facet | Pedro M. Faia Juliano Libardi Itamar Barbosa Evando S. Araújo Helinando P. de Oliveira |
| author_sort | Pedro M. Faia |
| collection | DOAJ |
| description | The study of selective metal oxide-based binary/ternary systems has received increasing interest in recent years due to the possibility of producing efficient new ceramic materials for relative humidity (RH) detection, given the superior properties of the mixed compounds in comparison with pristine ones. The aim of this work was focused on preparation and characterization of non-doped and Nb2O5-doped TiO2 : WO3 pair (in the pellet form) and evaluation of corresponding humidity-dependent electrical properties. The microstructure of the samples was analyzed from scanning electron microscopy, X-ray diffraction patterns, Raman spectra, BET surface area analysis, and porosimetry. The electrical characterization was obtained from impedance spectroscopy (100 Hz to 40 MHz) in the 10–100% RH range. The results showed that adequate doping levels of Nb2O5 introduce important advantages due to the atomic substitution of Ti by Nb atoms in highly doped structures with different levels of porosity and grain sizes. These aspects introduced a key role in the excursion (one order of magnitude) in the bulk resistance and grain boundary resistance, which characterizes these composite ceramics as a promising platform for RH identification. |
| format | Article |
| id | doaj-art-cfaaa0ab5fb149c2aa1b5fd9baa6a6a7 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-cfaaa0ab5fb149c2aa1b5fd9baa6a6a72025-02-03T05:46:19ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422017-01-01201710.1155/2017/28082622808262Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed PowdersPedro M. Faia0Juliano Libardi1Itamar Barbosa2Evando S. Araújo3Helinando P. de Oliveira4CEMUC, Electrical and Computers Engineering Department, Faculty of Sciences and Technology, University of Coimbra, Polo 2, Pinhal de Marrocos, 3030-290 Coimbra, PortugalPhysics Department, Technological Institute of Aeronautics (ITA), Pça. Marechal Eduardo Gomes 50, 12228-900 São José dos Campos, SP, BrazilIndustrial Fostering and Coordination Institute (IFI), Pça. Marechal Eduardo Gomes 50, Vila das Acácias, São José dos Campos, SP, BrazilInstitute of Materials Science, Federal University of Sao Francisco Valley, 48920-310 Juazeiro, BA, BrazilInstitute of Materials Science, Federal University of Sao Francisco Valley, 48920-310 Juazeiro, BA, BrazilThe study of selective metal oxide-based binary/ternary systems has received increasing interest in recent years due to the possibility of producing efficient new ceramic materials for relative humidity (RH) detection, given the superior properties of the mixed compounds in comparison with pristine ones. The aim of this work was focused on preparation and characterization of non-doped and Nb2O5-doped TiO2 : WO3 pair (in the pellet form) and evaluation of corresponding humidity-dependent electrical properties. The microstructure of the samples was analyzed from scanning electron microscopy, X-ray diffraction patterns, Raman spectra, BET surface area analysis, and porosimetry. The electrical characterization was obtained from impedance spectroscopy (100 Hz to 40 MHz) in the 10–100% RH range. The results showed that adequate doping levels of Nb2O5 introduce important advantages due to the atomic substitution of Ti by Nb atoms in highly doped structures with different levels of porosity and grain sizes. These aspects introduced a key role in the excursion (one order of magnitude) in the bulk resistance and grain boundary resistance, which characterizes these composite ceramics as a promising platform for RH identification.http://dx.doi.org/10.1155/2017/2808262 |
| spellingShingle | Pedro M. Faia Juliano Libardi Itamar Barbosa Evando S. Araújo Helinando P. de Oliveira Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed Powders Advances in Materials Science and Engineering |
| title | Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed Powders |
| title_full | Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed Powders |
| title_fullStr | Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed Powders |
| title_full_unstemmed | Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed Powders |
| title_short | Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed Powders |
| title_sort | preparation characterization and evaluation of humidity dependent electrical properties of undoped and niobium oxide doped tio2 wo3 mixed powders |
| url | http://dx.doi.org/10.1155/2017/2808262 |
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