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Ethanol and methanol sensing characteristics of Nb‐doped TiO 2 porous thin films
Author(s) -
Nechita Violeta,
Schoonman Joop,
Musat Viorica
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201127057
Subject(s) - methanol , dopant , materials science , thin film , doping , alcohol , ethanol , microstructure , sol gel , porosity , analytical chemistry (journal) , morphology (biology) , chemical engineering , nanotechnology , optoelectronics , organic chemistry , chemistry , composite material , biology , engineering , genetics
Undoped and Nb‐doped TiO 2 porous thin films have been obtained through a sol–gel method using analytical grades Ti(O i C 3 H 7 ) 4 and Nb(OC 2 H 5 ) 5 as precursors. The morphology, crystalline microstructure, and the sensing properties towards ethanol and methanol of the obtained thin films have been investigated. The effects of the dopant on the film morphology and on alcohol sensing properties are discussed. Both direct current (DC) and alternating current (AC) measurements were performed at different temperatures in methanol and ethanol ambients to better understand the mechanisms of the alcohol detection. In the presence of a small amount of Nb, the activation energy for electrical conduction decreased. Nb doping improves the selectivity for methanol in the temperature range of 300–400 °C. The Nyquist diagrams showed complex phenomena during alcohol detection.