Influence of cross-sectional geometry on the sensitivity and hysteresis of liquid-phase electronic pressure sensors

Yong-Lae Park, Daniel Tepayotl-Ramirez, Robert J. Wood, and Carmel Majidi
Applied Physics Letters, Vol. 101, No. 19, November, 2012


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Abstract
Cross-sectional geometry influences the pressure-controlled conductivity of liquid-phase metal channels embedded in an elastomer film. These soft microfluidic films may function as hyperelastic electric wiring or sensors that register the intensity of surface pressure. As pressure is applied to the elastomer, the cross-section of the embedded channel deforms, and the electrical resistance of the channel increases. In an effort to improve sensitivity and reduce sensor nonlinearity and hysteresis, we compare the electrical response of 0.25 mm^2 channels with different cross-sectional geometries. We demonstrate that channels with a triangular or concave cross-section exhibit the least nonlinearity and hysteresis over pressures ranging from 0 to 70 kPa. These experimental results are in reasonable agreement with predictions made by theoretical calculations that we derive from elasticity and Ohm's Law.

Notes
Number of pages: 4

Text Reference
Yong-Lae Park, Daniel Tepayotl-Ramirez, Robert J. Wood, and Carmel Majidi, "Influence of cross-sectional geometry on the sensitivity and hysteresis of liquid-phase electronic pressure sensors," Applied Physics Letters, Vol. 101, No. 19, November, 2012

BibTeX Reference
@article{Park_2012_7481,
   author = "Yong-Lae Park and Daniel Tepayotl-Ramirez and Robert J. Wood and Carmel Majidi",
   title = "Influence of cross-sectional geometry on the sensitivity and hysteresis of liquid-phase electronic pressure sensors",
   journal = "Applied Physics Letters",
   month = "November",
   year = "2012",
   volume = "101",
   number = "19",
}