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

Sensors

Byung Jin Cho¹  Jung-Ha Kim¹  Wan Sik Hwang²  Kook In Han³  In Gyu Lee³  Seungdu Kim³  Jong Pil Kim⁴  Suck Won Hong⁴ 

[1] Molecular Materials Research Team, Korea Basic Science Institute, Busan 168-230, Korea;Department of Cogno-Mechatronics Engineering, Department of Optics and Mechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, Busan 46241, Korea;Department of Materials Engineering, Korea Aerospace University, Goyang 10540, Korea;;Division of High Technology Materials Research &

关键词: graphene oxide coating;    electrostatic force;    capacitive sensor;    humidity sensor;   

DOI  :  10.3390/s17020407

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown