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Issue 16, 2018
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Towards low-power electronics: self-recovering and flexible gas sensors

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Abstract

A new paradigm in recovery strategies for gas sensors is presented in this work. Resistive gas sensors based on carbon nanotubes (CNT) are well-known and show high sensitivity to different gas species but they require external recovery (i.e. heating) to offer a fast and stable response. In order to avoid this external element and reduce power demand, we demonstrate the possibility of recovering this kind of sensor by only applying a DC voltage. In particular, three different metals have been tested (Au, Ag and Al) to define interdigitated electrodes on a polyimide substrate. On top of them, CNT layers have been sprayed as a sensitive layer. The performance of these devices in terms of gas sensitivity, power consumption and stability is described and compared with external heating recovery. In particular, Au electrodes show a response to 2500 ppm CO2 of 2.6% with a recovery voltage of 5 V, presenting almost the same sensitivity as in the case of the external recovery at 80 °C but decreasing the power demand by more than 35 times.

Graphical abstract: Towards low-power electronics: self-recovering and flexible gas sensors

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Supplementary files

Article information


Submitted
27 Dec 2017
Accepted
19 Mar 2018
First published
21 Mar 2018

J. Mater. Chem. A, 2018,6, 7107-7113
Article type
Paper

Towards low-power electronics: self-recovering and flexible gas sensors

A. Falco, A. Rivadeneyra, F. C. Loghin, J. F. Salmeron, P. Lugli and A. Abdelhalim, J. Mater. Chem. A, 2018, 6, 7107
DOI: 10.1039/C7TA11311K

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