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

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...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2017-02, Vol.17 (2), p.407-407
Main Authors: Han, Kook In, Kim, Seungdu, Lee, In Gyu, Kim, Jong Pil, Kim, Jung-Ha, Hong, Suck Won, Cho, Byung Jin, Hwang, Wan Sik
Format: Article
Language:English
Subjects:
capacitive sensor
Charging
Coating
electrostatic force
Electrostatics
Energy dispersive X ray spectroscopy
Fibers
Graphene
graphene oxide coating
Humidity
humidity sensor
Oxide coatings
Raman spectroscopy
Relative humidity
Scanning electron microscopy
Sensors
Silk
Spectrum analysis
Static electricity
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s17020407