Surface enhanced Raman scattering of aged graphene: Effects of annealing in vacuum

Surface enhanced Raman scattering of aged graphene: Effects of annealing in vacuum
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老化石墨烯的表面增强拉曼散射:真空退火的影响

DOI:
10.1063/1.3665624
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发表时间:
2011-12
影响因子:
4
通讯作者:
Ze Xiang Shen
Ze Xiang Shen
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhenhua Ni;Aizhi Li;Zainab Zafar;Yan Zhang;Zhonghua Ni;Shiliang Qu;Teng Qiu;Ting Yu;Ze Xiang Shen

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本文报道了一种简单的方法来恢复老化石墨烯的表面增强拉曼散射活性。吸附在老化石墨烯上的罗丹明分子的拉曼信号在真空退火后显著增加,并且与新鲜石墨烯上的那些相当。原子力显微镜测量表明,真空退火可以有效去除老化石墨烯表面的残留物,使目标分子与石墨烯紧密接触。我们还发现,石墨烯中的空穴掺杂将促进石墨烯与分子之间的电荷转移。这些结果证实了吸附在石墨烯上的目标分子的强拉曼增强是由于电荷转移机制。
In this paper, we report a simple method to recover the surface enhanced Raman scattering activity of aged graphene. The Raman signals of Rhodamine molecules absorbed on aged graphene are dramatically increased after vacuum annealing and comparable to those on fresh graphene. Atomic force microscopy measurements indicate that residues on aged graphene surface can efficiently be removed by vacuum annealing, which makes target molecule closely contact with graphene. We also find that the hole doping in graphene will facilitate charge transfer between graphene and molecule. These results confirm the strong Raman enhancement of target molecule absorbed on graphene is due to the charge transfer mechanism.
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