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  4. Decreasing the size of printed comb electrodes by the introduction of a dielectric interlayer for capacitive gas sensors on polymeric foil: Modeling and fabrication
 
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research article

Decreasing the size of printed comb electrodes by the introduction of a dielectric interlayer for capacitive gas sensors on polymeric foil: Modeling and fabrication

Molina-Lopez, F.  
•
Briand, D.  
•
de Rooij, N. F.  
2013
Sensors And Actuators B-Chemical

In this work we present a novel strategy to fabricate printed comb electrodes devices with decreased size by the introduction of a thin dielectric layer between the two combs. The electrical insulation of the two polarities prevents short-cuts occurring because of printing defects. In this way, the yield of the process increases as well as its resolution by decreasing significantly the gap between the electrodes. An analytical model is proposed and evaluated, confirming the capability of the method to enhance the nominal capacitance value of comb electrodes capacitors with reduced area. The validation of the proposed method has been performed by fabricating transducers made of inkjet printed silver combed electrodes with a parylene-C dielectric interlayer. The whole process takes place at low temperature, being compatible with the utilized PET substrate. Finally, the potential of such devices for sensing applications with improved performances was demonstrated by inkjet coating the transducers with a humidity sensing layer and characterizing their response for the capacitive detection of relative humidity. (C) 2013 Elsevier B.V. All rights reserved.

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Type
research article
DOI
10.1016/j.sob.2013.01.008
Web of Science ID

WOS:000326346300013

Author(s)
Molina-Lopez, F.  
•
Briand, D.  
•
de Rooij, N. F.  
Date Issued

2013

Publisher

Elsevier

Published in
Sensors And Actuators B-Chemical
Volume

189

Start page

89

End page

96

Subjects

Inkjet

•

Silver nanoparticles

•

Printed capacitor

•

Parylene-C

•

Polymeric foil

•

Humidity sensor

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SAMLAB  
Available on Infoscience
December 9, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/97618
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