title: Colors of graphene and graphene-oxide multilayers on various substrates.
abstract: We investigated the colors of graphene and graphene-oxide multilayers that were deposited on various dielectric layers. In particular, the effects of the material thickness, the types of dielectric layers, and the existence of a back silicon substrate were analyzed. The colors of graphene-oxide layers on a SiO2/Si substrate were found to periodically change as the material thickness increased. However, the colors of graphene layers on the same substrate became saturated without a similar periodic change. The calculated colors corresponding to the material thicknesses were verified by optical microscopy and profilometry. We believe that these results demonstrate the possibility of utilizing color as a simple tool for detecting and estimating the thicknesses of graphene and graphene-oxide multilayers.
authors.affiliation: Department of Mechanical Engineering, Kyung Hee University, Suwon 446-701, Korea.
authors.forename: Inhwa
authors.initials: I
authors.lastname: Jung
authors.forename: Jong-Soo
authors.initials: JS
authors.lastname: Rhyee
authors.forename: Jong Yeog
authors.initials: JY
authors.lastname: Son
authors.forename: Rodney S
authors.initials: RS
authors.lastname: Ruoff
authors.forename: Kyong-Yop
authors.initials: KY
authors.lastname: Rhee