title: Electromagnetic interference (EMI) transparent shielding of reduced graphene oxide (RGO) interleaved structure fabricated by electrophoretic deposition.
abstract: Here we introduce the electromagnetic shielding effectiveness (SE) of reduced graphene oxide (RGO) sheets interleaved between polyetherimide (PEI) films fabricated by electrophoretic deposition (EPD). Incorporating only 0.66 vol % of RGO, the developed PEI/RGO composite films exhibited an electromagnetic interference shielding effectiveness (EMI SE) at 6.37 dB corresponding to ∼50% shielding of incident waves. Excellent flexibility and optical transparency up to 62% of visible light was demonstrated. It was achieved by placing the RGO sheets in the localized area as a thin film (ca. 20 nm in thickness) between the PEI films (ca. 2 μm) to be an interleaved and alternating structure. This unique interleaved structure without any delamination areas was fabricated by a successive application of cathodic and anodic EPD of both RGO and PEI layers. The EPD fabrication process was ensured by an alternating deposition of the quarternized-PEI drops and RGO, each taking positive and negative charges, respectively, in the water medium. We believe that the developed facile fabrication method of RGO interleaved structure with such low volume fraction has great potential to be used as a transparent EMI shielding material.
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon, Gyeonggi-Do 440-746, Republic of Korea (South Korea).
authors.forename: Sanghoon
authors.initials: S
authors.lastname: Kim
authors.forename: Joon-Suk
authors.initials: JS
authors.lastname: Oh
authors.forename: Myeong-Gi
authors.initials: MG
authors.lastname: Kim
authors.forename: Woojin
authors.initials: W
authors.lastname: Jang
authors.forename: Mei
authors.initials: M
authors.lastname: Wang
authors.forename: Youngjun
authors.initials: Y
authors.lastname: Kim
authors.forename: Hee Won
authors.initials: HW
authors.lastname: Seo
authors.forename: Ye Chan
authors.initials: YC
authors.lastname: Kim
authors.forename: Jun-Ho
authors.initials: JH
authors.lastname: Lee
authors.forename: Youngkwan
authors.initials: Y
authors.lastname: Lee
authors.forename: Jae-Do
authors.initials: JD
authors.lastname: Nam
keywords: EMI; EPD; RGO; SE; conductive; flexible; transparent