Terahertz, optical, and Raman signatures of monolayer graphene behavior in thermally reduced graphene oxide films

Juhwan Lim, Kyujin Choi, J. R. Rani, Jin Seon Kim, Changgu Lee, Jae Hoon Kim, Seong Chan Jun

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We report on our joint spectroscopic study of the thermal reduction process of quasi-monolayer graphene oxide films grown on fused silica substrates by spin-coating. We estimate that about 65 of our film area consists of monolayer platelets of reduced graphene oxide, based on our quantitative analysis of the local atomic force microscopy topography. With thermal annealing under suitable conditions, clear signatures of monolayer graphene behavior were identified in the resonant excitonic absorption at 4.55 eV, the overall decrease in the visible-range transmission, the re-emergence of the Raman 2D band, the red-shift of the Raman G band toward the monolayer position, and the decrease in the optical sheet resistance in the terahertz range.

Original languageEnglish
Article number183502
JournalJournal of Applied Physics
Volume113
Issue number18
DOIs
Publication statusPublished - 2013 May 14

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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