Chemical Mechanism and Tunability of Surface-Enhanced Raman Scattering of Pyridine on Heteronuclear Coinage Metal Diatomic Clusters: A Density Functional Study

Chemical Mechanism and Tunability of Surface-Enhanced Raman Scattering of Pyridine on Heteronuclear Coinage Metal Diatomic Clusters: A Density Functional Study
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异核造币金属双原子簇上吡啶表面增强拉曼散射的化学机制和可调性:密度泛函研究

DOI:
10.1021/jp401462t
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发表时间:
2013-06
影响因子:
3.7
通讯作者:
Zhang, Rui-Qin
Zhang, Rui-Qin
中科院分区:
化学3区
文献类型:
--
作者:
Chen, Lei;Li, Zhengqiang;Meng, Yan;Lu, Ming;Wang, Zhigang;Zhang, Rui-Qin

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作为表面增强拉曼散射(Sers)基底,钴团簇具有很高的Sers增强效应,在精密分子检测中具有潜在的应用价值。在这里,我们阐明了化学机制,并揭示了在钴基底上的吡啶分子(Py)的Sers的可调谐性,通过研究各种可能的异质结钴金属双原子团簇(HCMDC)与吡啶分子的相互作用。利用密度泛函理论计算了HCMDC-Py体系的拉曼光谱、分子轨道和结合性质。我们发现HCMDC的拉曼特征峰、吸附能、电荷转移、几何参数和分子轨道分布都与HCMDC的组成和结合位点密切相关。结果表明,HMDC中不同配位金属原子的协同效应对Sers增强起着重要作用,其增强效果随HMDC的组成和吸附位置而异,从而为HMDC的表面增强提供了可能。
As surface-enhanced Raman scattering (SERS) substrates, coinage bimetallic clusters offer high SERS enhancement and potential for applications in precision molecule detection. Here, we elucidate the chemical mechanism and reveal the tunability of the SERS of a pyridine molecule (Py) on coinage bimetallic substrate by investigating various possible heteronuclear coinage metal diatomic clusters (HCMDCs) interacting with the pyridine molecule. We obtain the Raman spectra, molecular orbital, and binding property of each HCMDC–Py system using density functional theory. We find that the Raman characteristic peaks, adsorption energy, charge transfer, geometry parameters, and molecular orbital distribution are all closely related to the compositions and binding sites of the HCMDC. The results show that the synergistic effect of different coinage metal atoms in the HCMDC plays an important role in SERS enhancement, which varies with the component and adsorption site of the HCMDC, thus providing the possibility of ...
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