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Sensors 2017, 17(2), 407; doi:10.3390/s17020407

Compliment Graphene Oxide Coating on Silk Fiber Surface via Electrostatic Force for Capacitive Humidity Sensor Applications

1
Department of Materials Engineering, Korea Aerospace University, Goyang 10540, Korea
2
Division of High Technology Materials Research & Molecular Materials Research Team, Korea Basic Science Institute, Busan 168-230, Korea
3
Department of Cogno-Mechatronics Engineering, Department of Optics and Mechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, Busan 46241, Korea
4
Department of Electrical Engineering, KAIST, Daejeon 34141, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Jesús M. Corres and Francisco J. Arregui
Received: 21 December 2016 / Revised: 14 February 2017 / Accepted: 15 February 2017 / Published: 19 February 2017
(This article belongs to the Special Issue Humidity Sensors)
View Full-Text   |   Download PDF [1556 KB, uploaded 19 February 2017]   |  

Abstract

Cylindrical silk fiber (SF) was coated with Graphene oxide (GO) for capacitive humidity sensor applications. Negatively charged GO in the solution was attracted to the positively charged SF surface via electrostatic force without any help from adhesive intermediates. The magnitude of the positively charged SF surface was controlled through the static electricity charges created on the SF surface. The GO coating ability on the SF improved as the SF’s positive charge increased. The GO-coated SFs at various conditions were characterized using an optical microscope, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Raman spectroscopy, and LCR meter. Unlike the intact SF, the GO-coated SF showed clear response-recovery behavior and well-behaved repeatability when it was exposed to 20% relative humidity (RH) and 90% RH alternatively in a capacitive mode. This approach allows humidity sensors to take advantage of GO’s excellent sensing properties and SF’s flexibility, expediting the production of flexible, low power consumption devices at relatively low costs. View Full-Text
Keywords: graphene oxide coating; electrostatic force; capacitive sensor; humidity sensor graphene oxide coating; electrostatic force; capacitive sensor; humidity sensor
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MDPI and ACS Style

Han, K.I.; Kim, S.; Lee, I.G.; Kim, J.P.; Kim, J.-H.; Hong, S.W.; Cho, B.J.; Hwang, W.S. Compliment Graphene Oxide Coating on Silk Fiber Surface via Electrostatic Force for Capacitive Humidity Sensor Applications. Sensors 2017, 17, 407.

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