Effects of Surface Chemistry of Substrates on Raman Spectra in Graphene
Effects of Surface Chemistry of Substrates on Raman Spectra in Graphene
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DOI：
10.1021/jp2113158
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发表时间：
2012-02
影响因子：
3.7
通讯作者：
T. Tsukamoto;K. Yamazaki;Hiroki Komurasaki;T. Ogino
中科院分区：
文献类型：
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作者：
T. Tsukamoto;K. Yamazaki;Hiroki Komurasaki;T. Ogino
我们研究了衬底的表面化学对石墨烯薄片的拉曼光谱的影响，所述石墨烯薄片在室温环境条件下与各种绝缘衬底（例如石英和蓝宝石）接触。研究了这种衬底上石墨烯片的G峰位置，并在化学单相蓝宝石（0001）衬底上观察到G带的显著蓝移。在具有Al封端（亲水性）和O封端（疏水性）域的相分离蓝宝石（0001）衬底上，石墨烯薄片的G带由中心在1587 cm-1（G1-峰）和1593 cm-1（G2-峰）的两个峰组成。G1峰来自O-末端结构域，G2峰来自Al-末端结构域。由于2D峰位移很小，G带中的拉曼位移归因于来自环境条件的化学掺杂，特别是石墨烯/衬底界面处的水层，其导致空穴掺杂。G带的蓝移随温度升高而增加。
We investigated the effects of surface chemistry of substrates on the Raman spectra of graphene flakes that come into contact with various insulating substrates, such as quartz and sapphire, under ambient conditions at room temperature. The G-peak positions of graphene flakes on such substrates were investigated, and significant blue-shifts of the G-band were observed on a chemically single-phased sapphire (0001) substrate. On a phase-separated sapphire (0001) substrate with Al-terminated (hydrophilic) and O-terminated (hydrophobic) domains, the G-band of graphene flakes was composed of two peaks centered at 1587 cm–1 (G1-peak) and 1593 cm–1 (G2-peak). The G1-peak originated from the O-terminated domain and the G2-peak from the Al-terminated one. Since the 2D-peak shifts were small, the Raman shifts in the G-band were attributed to chemical doping from environmental conditions, especially water layers at the graphene/substrate interface that cause hole-doping. The blue-shift in the G-band increased with t...