V2O5 Thin Films for Flexible and High Sensitivity Transparent Temperature Sensor. Issue 6 (14th July 2016)

• Record Type: Journal Article
• Authors: Bianchi, Catarina; Loureiro, Joana; Duarte, Paulo; Marques, Jose; Figueira, Joana; Ropio, Ines; Ferreira, Isabel
• Is Part Of: Advanced materials technologies. Volume 1:Issue 6(2016)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-07-14
• Subjects: flexible -- temperature sensors -- thermoelectric -- vanadium pentoxide; Materials science -- Periodicals; Technological innovations -- Periodicals; Materials science; Technological innovations; Periodicals; 620.1105
• DOI: 10.1002/admt.201600077
• Languages: English
• ISSNs: 2365-709X

Abstract

Abstract : This work reports the optimization of V2 O5 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 V2 O5 films deposited on glass, after an annealing step of 1 h at 773 K, in air. The V2 O5 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. Abstract : Flexible and transparent temperature sensors made of V2 O5 thin films, deposited by thermal evaporation on Kapton substrate, are demonstrated. The V2 O5 films are optimized in terms of film thickness and annealing temperature/time to obtain a high Seebeck coefficient of −595 μV K −1 .