Properties of spray-deposited liquid-phase exfoliated graphene films. (17th November 2017)

• Record Type: Journal Article
• Authors: Sales, Maria Gabriela C.; Dela Vega, Ma. Shanlene D. C.; Vasquez, Magdaleno R.
• Is Part Of: Japanese journal of applied physics. Volume 57:Number 1(2018)Supplement 1
• Publication Date: 2017-11-17
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.57.01AF06
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: In this study, we demonstrate the feasibility of spray-depositing exfoliated graphene on flexible polyimide (PI) and rigid (soda lime glass) substrates for optoelectronic applications. The water contact angles of the substrates increased by 13% (for PI) and 49% (for glass) when the surfaces are pretreated with hexamethyldisiloxane, which significantly improved the adhesion of the films. Raman spectral analyses confirmed a minimum of 15 and a maximum of 23 layers of exfoliated graphene deposited on the substrates. After deposition, the films were exposed to 13.56 MHz radio-frequency plasma containing an admixture of argon and nitrogen gases. Plasma treatment modified the electrical properties with a response analogous to that of a rectifier. A 39% increase in transmittance in the visible region was also observed especially for glass substrates after plasma treatment without a significant change in film electrical conductivity.