Ilkiv Bogdan, Petrovska Svitlana, Sergiienko Ruslan, Tomai Takaaki, Shibata Etsuro, Nakamura Takashi, Honma Itaru, Zaulychnyy Yaroslav
Frantsevich Institute for Problems of Materials Science, 3 Krzhyzhanivsky Street, Kyiv 03680, Ukraine.
J Nanosci Nanotechnol. 2012 Dec;12(12):8913-9. doi: 10.1166/jnn.2012.6787.
Investigations of the electronic structure of graphene nanosheets synthesized by the reduction of oxidized graphene nanosheets were carried out using ultra-soft X-ray emission spectroscopy (USXES). Oxidized graphene nanosheets were produced from carbon nanofiber starting material using a modified Hummers method. X-ray diffraction, and scanning and transmission electron microscopy investigations were used in addition to USXES to study the electronic structure evolution from carbon nanofibers to graphene nanosheets. The effect of the degree of corrugation of the graphene nanosheets on the fine structure of the CK(alpha)-emission bands was revealed by USXES. It was found that corrugation of the graphene nanosheets is caused by overlapping of the pi-orbitals and formation of mixed (sigma + pi)-states.
利用超软X射线发射光谱（USXES）对通过还原氧化石墨烯纳米片合成的石墨烯纳米片的电子结构进行了研究。氧化石墨烯纳米片是使用改进的Hummers方法由碳纳米纤维原料制备的。除了USXES之外，还使用X射线衍射、扫描和透射电子显微镜研究来研究从碳纳米纤维到石墨烯纳米片的电子结构演变。USXES揭示了石墨烯纳米片的波纹度对CK（α）发射带精细结构的影响。发现石墨烯纳米片的波纹是由π轨道的重叠和混合（σ + π）态的形成引起的。
