TY - JOUR
T1 - Supercritical alcohols as solvents and reducing agents for the synthesis of reduced graphene oxide
AU - Seo, Myoungdo
AU - Yoon, Doyeon
AU - Hwang, Kyo Seon
AU - Kang, Jeong Won
AU - Kim, Jaehoon
N1 - Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea Grant funded by the Ministry of Science, ICT & Future Planning ( 2009-0083540 ).
PY - 2013/11
Y1 - 2013/11
N2 - We report on a facile, simple, and green graphene oxide (GO) reduction method based on a supercritical alcohol approach. The influence over the chemical, thermal, morphological, and textural properties of reduced graphene oxides (RGOs) of five different alcohols in their supercritical conditions - methanol, ethanol, 1-propanol, 2-propanol, and 1-butanol - was investigated in detail. Although the thermal stabilities and Fourier-transform infrared spectra of RGOs produced using the different alcohols are very similar, a substantial difference in the carbon-to-oxygen ratios measured by X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller surface areas are observed. The RGO produced using supercritical ethanol exhibited a much higher carbon-to-oxygen ratio of 14.4 and a much larger surface area of 203 m2/g compared with that produced using the other supercritical alcohols. Raman spectra showed that the RGOs produced using supercritical ethanol and supercritical 2-propanol retained more of the graphitic structure. X-ray diffraction analysis revealed that RGOs produced using supercritical 1-propanol and supercritical 1-butanol retained at least two different interlayer spacings. The deoxygenation mechanism of GO in supercritical ethanol is proposed based on gas and liquid product analysis.
AB - We report on a facile, simple, and green graphene oxide (GO) reduction method based on a supercritical alcohol approach. The influence over the chemical, thermal, morphological, and textural properties of reduced graphene oxides (RGOs) of five different alcohols in their supercritical conditions - methanol, ethanol, 1-propanol, 2-propanol, and 1-butanol - was investigated in detail. Although the thermal stabilities and Fourier-transform infrared spectra of RGOs produced using the different alcohols are very similar, a substantial difference in the carbon-to-oxygen ratios measured by X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller surface areas are observed. The RGO produced using supercritical ethanol exhibited a much higher carbon-to-oxygen ratio of 14.4 and a much larger surface area of 203 m2/g compared with that produced using the other supercritical alcohols. Raman spectra showed that the RGOs produced using supercritical ethanol and supercritical 2-propanol retained more of the graphitic structure. X-ray diffraction analysis revealed that RGOs produced using supercritical 1-propanol and supercritical 1-butanol retained at least two different interlayer spacings. The deoxygenation mechanism of GO in supercritical ethanol is proposed based on gas and liquid product analysis.
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U2 - 10.1016/j.carbon.2013.07.053
DO - 10.1016/j.carbon.2013.07.053
M3 - Article
AN - SCOPUS:84883600832
VL - 64
SP - 207
EP - 218
JO - Carbon
JF - Carbon
SN - 0008-6223
ER -