Drawing WS2thermal sensors on paper substrates
Martin Lee (Kavli institute of nanoscience Delft, TU Delft - QN/Steeneken Lab)
Ali Mazaheri (University of Tehran, Instituto de Ciencia de Materiales de Madrid (ICMM))
Herre S.J. Van Der Zant (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)
Riccardo Frisenda (Instituto de Ciencia de Materiales de Madrid (ICMM))
Andres Castellanos-Gomez (Instituto de Ciencia de Materiales de Madrid (ICMM))
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Abstract
Paper based thermoresistive sensors are fabricated by rubbing WS2 powder against a piece of standard copier paper, like the way a pencil is used to write on paper. The abrasion between the layered material and the rough paper surface erodes the material, breaking the weak van der Waals interlayer bonds, yielding a film of interconnected platelets. The resistance of WS2 presents a strong temperature dependence, as expected for a semiconductor material in which charge transport is due to thermally activated carriers. This strong temperature dependence makes the paper supported WS2 devices extremely sensitive to small changes in temperature. This exquisite thermal sensitivity, and their fast response times to sudden temperature changes, is exploited thereby demonstrating the USAbility of a WS2-on-paper thermal sensor in a respiration monitoring device.
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