V2O5 Thin Films for Flexible and High Sensitivity Transparent Temperature Sensor

Catarina Marques, Joana Loureiro, Paulo Duarte, José Marques, Joana Figueira, Inês Ropio, Isabel Ferreira

Research output: Contribution to journalArticle

Abstract

This work reports the optimization of V2O5 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 V2O5 films deposited on glass, after an annealing step of 1 h at 773 K, in air. The V2O5 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.
Original languageEnglish
Article number1600077
JournalAdvanced Materials Technologies
Volume1
Issue number6
DOIs
Publication statusPublished - 14 Jul 2016

Keywords

  • MICROFLUIDIC DEVICE

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