Piezoresistive effect in epoxy-graphite composites

In this work, we investigate the piezoresistive response of epoxy-graphite composites. A resistive thick-film Wheatstone bridge is deposited by screen-printing onto an alumina beam, a weight is then applied on the tip of the beam and the resulting electrical signal response is recorded, allowing the calculation of the gauge factor. The characterization was made at room temperature, 60°C and 100°C for different matrixes (epoxies with different glass transition temperatures, Tg) and particles sizes (4 μm and 15 μm). The creep of the signal in time and temperature was also observed. The present work shows also the tremendous effect of Tg on piezoresistive behavior: the high Tg epoxy demonstrating better stability in time and temperature than the other one.


Published in:
Procedia Engineering, 25, 235-238
Presented at:
Eurosensors XXV, Athens (GR), 4-7.9.2011
Year:
2011
Publisher:
Elsevier Science, Reg Sales Off, Customer Support Dept, 655 Ave Of The Americas, New York, Ny 10010 Usa
ISSN:
1877-7058
Keywords:
Note:
Caractérisation piézorésistive de résistances époxy-graphite. Version étendue publiée ensuite dans Sensors & Actuators (URL)
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2012-06-03, last modified 2018-09-13

Poster:
Download fulltextPDF
Postprint:
Download fulltextPDF
Publisher's version:
Download fulltextPDF
External link:
Download fulltextURL
Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)