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首页> 外文期刊>Advanced Functional Materials >Enhanced Raman Scattering of CuPc Films on Imperfect WSe_2 Monolayer Correlated to Exciton and Charge-Transfer Resonances
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Enhanced Raman Scattering of CuPc Films on Imperfect WSe_2 Monolayer Correlated to Exciton and Charge-Transfer Resonances

机译：与激子和电荷转移共振相关的不完全WSe_2单层上CuPc薄膜的增强拉曼散射

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摘要

Recently, 2D transition-metal dichalcogenides (2D TMDCs) are identified as ideal substrates for surface-enhanced Raman scattering (SERS). However, the effect of enhancement factor (EF) on TMDCs is lower than metal-based SERS substrates. Here, it is demonstrated that the SERS performance of WSe2 monolayer can be enhanced via tailoring the atomic ratio of WSe2; this correlates to the exciton and charge-transfer resonances. CuPc molecules are adsorbed onto WSe2 monolayers as the probe molecules, and the atomic ratio (Se: W) of WSe2 is tailored from 2 to 1.92. For an atomic ratio of 1.96, the maximum EF on irradiated WSe2 is more than 120; this is enhanced by more than 40 times compared with pristine WSe2. The amplitude of exciton and charge-transfer resonances is estimated by femtosecond optical pump-probe measurement and a bipolar junction transistor (BJT) consisting of CuPc film and 2D materials. It is found that the intensity of resonances in the CuPc-WSe2 system is tailored by the atomic ratio of WSe2. This is closely correlated to the SERS performance of WSe2. This study shows that the SERS performance of WSe2 is enhanced by tuning the atomic ratio of WSe2 and provides qualitative theoretical explanations for the mechanism of enhanced SERS.
机译：最近，二维过渡金属二卤化物（2D TMDC）被​​确定为表面增强拉曼散射（SERS）的理想底物。但是，增强因子（EF）对TMDC的影响低于金属基SERS衬底。在此表明，通过调整WSe2的原子比可以提高WSe2单层的SERS性能。这与激子和电荷转移共振有关。 CuPc分子作为探针分子吸附到WSe2单层上，并且WSe2的原子比（Se：W）从2变为1.92。对于1.96的原子比，在照射的WSe2上的最大EF大于120；对于原子比1.9的最大比。与原始的WSe2相比，它提高了40倍以上。激子和电荷转移共振的幅度通过飞秒光学泵浦探针测量和由CuPc薄膜和2D材料组成的双极结型晶体管（BJT）估算。发现CuPc-WSe2系统中的共振强度是由WSe2的原子比定制的。这与WSe2的SERS性能密切相关。这项研究表明，通过调节WSe2的原子比可以提高WSe2的SERS性能，并为增强SERS的机理提供定性的理论解释。

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  • 来源
    《Advanced Functional Materials》 |2018年第52期|1805710.1-1805710.7|共7页
  • 作者

    Liu Yanran; Gao Zhibin; Chen Ming; Tan Yang; Chen Feng;

  • 作者单位

    Shandong Univ, State Key Lab Crystal Mat, Sch Phys, Jinan 250100, Shandong, Peoples R China;

    Tongji Univ, Sch Phys Sci & Engn, Shanghai Key Lab Special Artificial Microstruct M, China EU Joint Ctr Nanophonon,Ctr Phonon & Therma, Shanghai 200092, Peoples R China;

    Shandong Univ, State Key Lab Crystal Mat, Sch Phys, Jinan 250100, Shandong, Peoples R China;

    Shandong Univ, State Key Lab Crystal Mat, Sch Phys, Jinan 250100, Shandong, Peoples R China;

    Shandong Univ, State Key Lab Crystal Mat, Sch Phys, Jinan 250100, Shandong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    charge transfer; exciton; surface-enhanced Raman scattering; transition-metal dichalcogenides (TMDCs);

    机译：电荷转移;激子;表面增强拉曼散射;过渡金属二硫化碳（TMDC）;

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