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V 2 O 5 Thin Films for Flexible and High Sensitivity Transparent Temperature Sensor
Author(s) -
Bianchi Catarina,
Loureiro Joana,
Duarte Paulo,
Marques Jose,
Figueira Joana,
Ropio Ines,
Ferreira Isabel
Publication year - 2016
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201600077
Subject(s) - seebeck coefficient , polydimethylsiloxane , materials science , annealing (glass) , thermoelectric effect , polyimide , optoelectronics , thin film , temperature gradient , temperature coefficient , analytical chemistry (journal) , composite material , nanotechnology , thermal conductivity , layer (electronics) , chemistry , physics , chromatography , thermodynamics , quantum mechanics
This work reports the optimization of V 2 O 5 Seebeck coefficient to obtain high sensitivity and transparent temperature sensors. It is observed that the film thickness plays a major role on the thermoelectric properties, together with the annealing step, obtaining a Seebeck coefficient of −690 μV K −1 , for 75 nm thick V 2 O 5 films deposited on glass, after an annealing step of 1 h at 773 K, in air. The V 2 O 5 films are also deposited and optimized on polyimide substrates, but lower annealing temperature is required, 573 K for 3 h, to maintain the flexibility of the substrate and simultaneously high Seebeck coefficient, −591 μV K −1 . These films are used in a simple design sensor and tested on the surface of a microfluidic channel (500 μm) made of polydimethylsiloxane, while having hot water flowing through it. The response time is below 1 s and the recovery time around 5 s.