Modulated Pencil-Drawn U-Shaped Piezoresistive Graphite on Compound Fibers for Wind Sensing
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The design, fabrication, analysis and measurement of the modulated pencil-drawn U-shaped piezoresistive graphite on paper compound fibers and its application for wind speed sensing are reported. We found that pencil drawing was a facile method for producing an ultrafine graphite film through the friction between the pencil leads and paper fibers. The pencil-drawn graphite was characterized by Raman spectroscopy and x-ray diffraction. The resistance of the patterned graphite sensor showed a decrease or an increase due to compression or tension bending, respectively, of the paper cantilever substrate. The wind impacting onto the flexible paper substrate with negative and positive speeds resulted in a bending compression or tension that was related to the resistance measured from the sensor. It was demonstrated that the resistance of a 10-mm -ide line of the U-shaped graphite on the paper substrate was 24 kΩ at ∼ 40° and 45 kΩ at ∼− 40°. Furthermore, we found that the graphite patterned on paper substrate with a small line width, such as 3 mm, showed good linearity for the relationship between the measured resistance and the wind speed.
KeywordsPiezoresistive high-flexibility device paper-based graphite wind sensing
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This study was funded by Nos. GRCK2016082914424352 and 20170719075917475 from the Shenzhen Science and Technology Innovation Committee. The authors declare that there was no conflict of interest with this publication.
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