Photochemical Engineering of Graphene Oxide Nanosheets
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- 作者：Michio Koinuma ; Chikako Ogata ; Yuki Kamei ; Kazuto Hatakeyama ; Hikaru Tateishi ; Yusuke Watanabe ; Takaaki Taniguchi ; Kengo Gezuhara ; Shinya Hayami ; Asami Funatsu ; Masayo Sakata ; Yutaka Kuwahara ; Seiji Kurihara ; Yasumichi Matsumoto
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：September 20, 2012
- 年：2012
- 卷：116
- 期：37
- 页码：19822-19827
- 全文大小：470K
- 年卷期：v.116,no.37(September 20, 2012)
- ISSN：1932-7455
文摘
Many unique properties of graphene oxide (GO) strongly depend on the oxygenated functional groups and morphologies. Here, the photoreaction process is demonstrated to be very useful to control these factors. We report the fast, simple production of nanopores in porous GO via photoreaction in O2 under UV irradiation at room temperature. Quantitative analysis using X-ray photoelectron spectroscopy showed that nanopores were produced in areas of oxygenated groups (sp3 carbon bonds), creating porous reduced graphene oxide (rGO). The photoreaction mechanism was proposed on the basis of changes in the number of oxygenated groups. Proton conduction occurred at the basal plane of epoxide groups in virgin GO, even at low humidity, and at carboxyl groups for porous rGO at high humidity. Thus, GO and rGO samples with various morphologies, oxygenated functional groups, and conduction types can be easily fabricated by controlling the photoreaction conditions.