Tunable piezoresistive sensors based on pencil-on-paper

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  • Ting-Kuo Kang
    Department of Electronic Engineering, Cheng Shiu University , No. 840, Chengching Rd., Niaosong Dist., Kaohsiung City 83347, Taiwan

Abstract

<jats:p>Tunable piezoresistive sensors based on a drawing on paper with different grades of pencils are proposed. While an external mechanical strain is applied to U-shape resistors prepared by pencil drawings on paper, an increase in the gauge factor with an increase in the graphite resistance is found. The result is attributed to the tunneling effect between neighboring graphite during the drawing process, further suggesting that different-grade pencil drawings can tune the piezoresistive properties. Through many cycles of repeatedly applied and released force, the output voltage for an HB pencil was found to be more sensitive than that for a 9B pencil.</jats:p>

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