Fluorescence manipulation from graphene and hydrogen-terminated graphene covered Au nanoparticles
Fluorescence manipulation from graphene and hydrogen-terminated graphene covered Au nanoparticles
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石墨烯和氢封端石墨烯覆盖的金纳米粒子的荧光操纵
DOI：
10.1063/5.0032470
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发表时间：
2021-01
期刊：
影响因子：
1.6
通讯作者：
Zhidong Wang
中科院分区：
文献类型：
--
作者：
Xitao Guo;Xiaoguang Luo;Amina Zafar;Yonghan Tan;Zhidong Wang
研究了石墨烯包覆Au纳米粒子（Au-NPs）对罗丹明-6 G（R6 G）的荧光调控。通过将石英衬底上的R6 G的荧光信号作为标准参考，我们观察到沉积在石英衬底上的裸Au-NP上的R6 G的荧光强度增加了2.4倍。然而，当Au-NP被H-封端的石墨烯覆盖时，这种增强降低到1.8倍。在由原始石墨烯覆盖的Au-NP的情况下，R6 G的荧光被显著猝灭了约7.6倍。由此产生的荧光水平可以归因于来自Au-NPs的局部场增强和Au-石墨烯混合纳米结构中石墨烯的猝灭效应，这通过我们的受控实验和模拟结果得到证实。我们的工作揭示了石墨烯材料对金属纳米粒子的表面修饰会对荧光产生很大的影响，为人工操纵荧光用于特定分子的传感，检测和成像提供了一种简单的方法。
This paper presents the fluorescence manipulation of Rhodamine-6G (R6G) due to Au nanoparticles (Au-NPs) covered by pristine graphene and hydrogen-terminated graphene. By taking florescence signals of R6G on a quartz substrate as the standard reference, we observe an ∼fourfold increase in fluorescence intensity of R6G on bare Au-NPs deposited on the quartz substrate. However, this enhancement reduces to ∼1.8-fold when Au-NPs are covered by H-terminated graphene. In the case of Au-NPs covered by pristine graphene, the fluorescence of R6G is significantly quenched by a factor of ∼7.6-fold. The resulting fluorescence level can be attributed to the local field enhancement from Au-NPs and the quenching effect of graphene in the Au–graphene hybrid nanostructure, which are confirmed by our controlled experimental and simulation results. Our work reveals that the surface modification of metal NPs by graphene materials would bring a great impact on fluorescence, providing a simple approach for artificially manipulating fluorescence for specific molecular sensing, detecting, and imaging.
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