Issue 16, 2018

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

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

Supplementary files

Article information

Article type
Paper
Submitted
27 Dec 2017
Accepted
19 Mar 2018
First published
21 Mar 2018

J. Mater. Chem. A, 2018,6, 7107-7113

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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