Fully inkjet printed SnO2 gas sensor on plastic substrate

A tin dioxide (SnO2) sensor was fabricated by inkjet printing onto polyimide foil. Gold electrodes and heater were printed on each side of the substrate. A SnO2 based ink was developed by sol-gel method and jetted onto the electrodes. A final annealing at 400 degrees C compatible with the polymeric transducers allowed to synthetize the SnO2 sensing film. Electrical measurements were carried out to characterize the response of the fully printed sensors under oxidizing and reducing gases. The device was heated up at a temperature between 200 and 300 degrees C using the integrated heater. The proper operation of the full printed metal-oxide gas sensors was validated under exposure to carbon monoxide and nitrogen dioxide, in dry and wet air. (C) 2016 Elsevier B.V. All rights reserved.

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Danick Briand, El Hadji Malick Camara, Nico de Rooij, Mathilde Rieu
Elsevier, 2016
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https://infoscience.epfl.ch/record/220999?ln=fr

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Inkjet Printed SnO2 Gas Sensor on Plastic Substrate

Danick Briand, El Hadji Malick Camara, Nico de Rooij, Mathilde Rieu

We report on the development of a metal oxide (MOx) sensor prepared by inkjet printing technology onto polyimide foil. Gold electrodes and a gold heater were printed on each side of the substrate, respectively. SnO2 based ink was developed by sol-gel method and printed onto the electrodes. A final annealing at 400°C compatible with the polymeric transducers allows to synthetize the SnO2 film. Electrical measurements were carried out to characterize the response of fully printed sensor under different gases. The device was operated at a temperature between 200 and 300°C using the integrated heater. The sensor exhibited responses to carbon monoxide and nitrogen dioxide, under dry and wet air. © 2015 The Authors. Published by Elsevier Ltd.

Elsevier2015

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Mechanical integrity of hybrid indium-free electrodes for flexible devices

Christophe Ballif, Ali Dabirian, Fabien Paul Jacques Dauzou, Yves Leterrier, Monica Morales Masis

Maintaining electrical conductivity, optical transparency, and mechanical integrity against bending and stretching are key requirements for flexible transparent electrodes. Transparent conducting oxides (TCOs) are widely used thin film electrodes in optoelectronic devices. However, these materials are brittle and reducing film thickness to improve their mechanical integrity compromises their electrical performance. Here we combine TCO thin films with metal grids embedded in a polymer substrate to create hybrid electrodes with low sheet resistance and high resilience to bending. Amorphous zinc tin oxide (ZTO) and aluminum-doped zinc oxide (AZO) films sputtered onto polyethylene-terephthalate (PET) substrates with and without embedded metal grids are studied. The hybrid electrodes have an optical absorptance below 5% in the visible range and their electrical sheet resistance is less than 1 Omega/sq. The critical strain for tensile failure is analyzed through a combination of electrical measurements and in-situ observations of crack initiation and propagation during tensile loading. The mean critical strain for failure of the AZO/metal grid is 8.5% and that of the ZTO/metal grid is as high as 10%. The AZO and ZTO films alone present critical strain values around 0.6% and 1% respectively, demonstrating that the addition of the metal grid considerably improves the resistance onset strain of the electrodes far beyond these critical strain limits. (C) 2016 Elsevier B.V. All rights reserved.

Elsevier2016

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