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Transparent, flexible, and stretchable WS2 based humidity sensors for electronic skin


Skin-mountable chemical sensors using flexible chemically sensitive nanomaterials are of great interest for electronic skin (e-skin) application. To build these sensors, the emerging atomically thin two-dimensional (2D) layered semiconductors could be a good material candidate. Herein, we show that a large-area WS2 film synthesized by sulfurization of a tungsten film exhibits high humidity sensing performance both in natural flat and high mechanical flexible states (bending curvature down to 5 mm). The conductivity of as-synthesized WS2 increases sensitively over a wide relative humidity range (up to 90%) with fast response and recovery times in a few seconds. By using graphene as electrodes and thin polydimethylsiloxane (PDMS) as substrates, a transparent, flexible and stretchable humidity sensor was fabricated. This senor can be well laminated onto skin and shows stable water moisture sensing behaviors in undeformed relax state as well as under compress and tensile loadings. Furthermore, its high sensing performance enables a real-time monitoring of human breath, indicating a potential mask-free breath monitoring for healthcare application. We believe that such a skin-activity compatible WS2 humidity sensor may shed light on developing low-power consumption wearable chemical sensors based on 2D semiconductors.

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Publication details

The article was received on 11 Feb 2017, accepted on 08 Apr 2017 and first published on 12 Apr 2017

Article type: Communication
DOI: 10.1039/C7NR01016H
Citation: Nanoscale, 2017, Accepted Manuscript
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    Transparent, flexible, and stretchable WS2 based humidity sensors for electronic skin

    H. Guo, C. Lan, Z. Zhou, P. Sun, D. Wei and C. Li, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR01016H

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