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UV-LIGHT-ASSISTED OXIDATIVE sp^3 HYBRIDIZATION OF GRAPHENE
FETHULLAH GÜNEŞ,한강희,신현진,이시영,MEIHUA JIN,DINH LOC DUONG,채승진,김은성,FEI YAO,ANASS BENAYAD,최재영,이영희 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.5
We report the transformation of electronic structures of sp^2 graphene to sp^3 graphene by UV-light-assisted oxidation. Two distinctive oxidation mechanisms were observed during this metal–insulator transition: (i) At low-oxidation regime, p-doping behavior by oxygen species extracting electrons from graphene and (ii) at high-oxidation regime, n-doping behavior by electron-hopping via strongly localized oxide states. We also found that the dominant oxygen-related functional group by UV-light-assisted oxidation was an epoxide group rather than hydroxyl group, which differed from conventional graphite oxide.
Chae, Seung Jin,Gü,neş,, Fethullah,Kim, Ki Kang,Kim, Eun Sung,Han, Gang Hee,Kim, Soo Min,Shin, Hyeon-Jin,Yoon, Seon-Mi,Choi, Jae-Young,Park, Min Ho,Yang, Cheol Woong,Pribat, Didier,Lee, Young WILEY-VCH Verlag 2009 Advanced Materials Vol.21 No.22
<B>Graphic Abstract</B> <P>Large-area, few-layer graphene is grown on a poly-nickel substrate using optimized CVD conditions. High temperature, short growth time, and an optimal gas mixing ratio (C<SUB>2</SUB>H<SUB>2</SUB>/H<SUB>2</SUB> = 2/45) are found to be necessary to synthesize highly crystalline few-layer grapheme, which may find applications in electronic devices. The wrinkles that are observed under all growth conditions are proposed to be formed by two processes. <img src='wiley_img/09359648-2009-21-22-ADMA200803016-content.gif' alt='wiley_img/09359648-2009-21-22-ADMA200803016-content'> </P>
Kim, Un Jeong,Lee, IL Ha,Bae, Jung Jun,Lee, Sangjin,Han, Gang Hee,Chae, Seung Jin,Gü,neş,, Fethullah,Choi, Jun Hee,Baik, Chan Wook,Kim, Sun Il,Kim, Jong Min,Lee, Young Hee WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.33
<P>Direct integration of vertically aligned carbon nanotube (VACNTs) patterns on a graphene layer combined with a liquid crystal cell can be utilized as an optical array. The hybrid structures have high transparency and conductivity and, as reported by Sun IL Kim, Jong Min Kim, Young Hee Lee, and co‐workers, clear diffraction patterns are obtained by modulating an external electric field. </P>
Yao, Fei,Duong, Dinh Loc,Lim, Seong Chu,Yang, Seung Bum,Hwang, Ha Ryong,Yu, Woo Jong,Lee, Il Ha,Gü,neş,, Fethullah,Lee, Young Hee Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.12
<P>In spite of the technical importance of detecting environmental SO<SUB><I>x</I></SUB> and NO<SUB><I>x</I></SUB> gases, a selective detection has not been realized because of their similar chemical properties. In this report, adsorption and desorption of SO<SUB>2</SUB> and NO<SUB>2</SUB> gas on carbon nanotubes are investigated in terms of different humidity levels at room temperature. A random-network single walled carbon nanotube (SWCNT) resistor is constructed by a dip-pen method using a SWCNT/dichloroethane (DCE) solution. In the case of SO<SUB>2</SUB> gas adsorption, the resistance increases at high humidity level (92%) and shows no obvious change at low humidity levels. On the other hand, in the case of NO<SUB>2</SUB> gas adsorption, the resistance always decreases independent of moisture levels. Our density functional theory (DFT) calculations show that this selective behavior originates from cooperative charge compensation between the SO<SUB>2</SUB>–<I>n</I>H<SUB>2</SUB>O complex and the p-type CNT resistor. The change of response time and recovery time with different moisture levels is further investigated. This humidity-assisted gas reaction provides a simple route to detect these two gases selectively.</P> <P>Graphic Abstract</P><P>Selective detection of SO<SUB>2</SUB> and NO<SUB>2</SUB> gas has been successfully realized on carbon nanotubes by introducing humidity in this study. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm03227a'> </P>