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

doi:10.1063/1.4803713

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 journal › Article › peer-review

17 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 language	English
Article number	183502
Journal	Journal of Applied Physics
Volume	113
Issue number	18
DOIs	https://doi.org/10.1063/1.4803713
Publication status	Published - 2013 May 14

Bibliographical note

Funding Information:
This work was partially supported by the Pioneer Research Center Program (2010-0019313), the Priority Research Centers Program (2009-0093823), and the Nano Material Technology Development Program (2012M3A7B4049802) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology.

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1063/1.4803713

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

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.",

author = "Juhwan Lim and Kyujin Choi and Rani, {J. R.} and Kim, {Jin Seon} and Changgu Lee and {Hoon Kim}, Jae and {Chan Jun}, Seong",

note = "Funding Information: This work was partially supported by the Pioneer Research Center Program (2010-0019313), the Priority Research Centers Program (2009-0093823), and the Nano Material Technology Development Program (2012M3A7B4049802) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology.",

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doi = "10.1063/1.4803713",

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T1 - Terahertz, optical, and Raman signatures of monolayer graphene behavior in thermally reduced graphene oxide films

AU - Lim, Juhwan

AU - Choi, Kyujin

AU - Rani, J. R.

AU - Kim, Jin Seon

AU - Lee, Changgu

AU - Hoon Kim, Jae

AU - Chan Jun, Seong

N1 - Funding Information: This work was partially supported by the Pioneer Research Center Program (2010-0019313), the Priority Research Centers Program (2009-0093823), and the Nano Material Technology Development Program (2012M3A7B4049802) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology.

PY - 2013/5/14

Y1 - 2013/5/14

N2 - 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.

AB - 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.

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

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

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