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Open AccessArticle

Scalable Fabrication of Highly Flexible Porous Polymer-Based Capacitive Humidity Sensor Using Convergence Fiber Drawing

1
Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060, USA
2
School of Optical and Electronic Information, Huazhong University of Science & Technology, Wuhan 430074, China
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Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
4
Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
5
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(12), 1985; https://doi.org/10.3390/polym11121985
Received: 29 October 2019 / Revised: 21 November 2019 / Accepted: 26 November 2019 / Published: 2 December 2019
(This article belongs to the Special Issue Polymer Adsorption at Interfaces)
In this study, we fabricated a highly flexible fiber-based capacitive humidity sensor using a scalable convergence fiber drawing approach. The sensor’s sensing layer is made of porous polyetherimide (PEI) with its porosity produced in situ during fiber drawing, whereas its electrodes are made of copper wires. The porosity induces capillary condensation starting at a low relative humidity (RH) level (here, 70%), resulting in a significant increase in the response of the sensor at RH levels ranging from 70% to 80%. The proposed humidity sensor shows a good sensitivity of 0.39 pF/% RH in the range of 70%–80% RH, a maximum hysteresis of 9.08% RH at 70% RH, a small temperature dependence, and a good stability over a 48 h period. This work demonstrates the first fiber-based humidity sensor fabricated using convergence fiber drawing. View Full-Text
Keywords: capacitive humidity sensor; convergence fiber drawing; porous polymer; flexible; PEI capacitive humidity sensor; convergence fiber drawing; porous polymer; flexible; PEI
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MDPI and ACS Style

Tousi, M.M.; Zhang, Y.; Wan, S.; Yu, L.; Hou, C.; Yan, N.; Fink, Y.; Wang, A.; Jia, X. Scalable Fabrication of Highly Flexible Porous Polymer-Based Capacitive Humidity Sensor Using Convergence Fiber Drawing. Polymers 2019, 11, 1985.

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