Unraveling the Raman Enhancement Mechanism on 1T′-Phase ReS2 Nanosheets
Unraveling the Raman Enhancement Mechanism on 1T′-Phase ReS2 Nanosheets
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揭示1T相ReS2纳米片的拉曼增强机制
DOI：
10.1002/smll.201704079
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发表时间：
2018-04-05
期刊：
影响因子：
13.3
通讯作者：
Xu, Ping
中科院分区：
文献类型：
--
作者：
Miao, Peng;Qin, Jing-Kai;Xu, Ping
二维过渡金属二硫属化物材料被探索作为潜在的表面增强拉曼光谱基底。本文系统研究了畸变的1 T（1 T '）二硫化铼（ReS 2）纳米片的拉曼增强机制。结合拉曼和光致发光的研究与引入的Al 2 O3介电层明确地揭示，拉曼增强ReS 2材料是从一个电荷转移过程，而不是从一个能量转移过程，和拉曼增强成反比，而光致发光猝灭效应是成正比的层数（厚度）的ReS 2纳米片。在单层ReS_2膜上，检测到强烈的共振增强拉曼散射效应，其强度依赖于激光激发能量，对罗丹明6 G和亚甲基蓝等染料分子的检测限可达10（-9）M。通过增强靶分子与基底之间的电荷相互作用实现的如此高的增强因子表明，仔细考虑层数依赖性特征和激发能相关的共振效应，ReS 2是用于传感应用的有希望的拉曼增强平台。
2D transition metal dichalcogenides materials are explored as potential surface-enhanced Raman spectroscopy substrates. Herein, a systematic study of the Raman enhancement mechanism on distorted 1T (1T') rhenium disulfide (ReS2) nanosheets is demonstrated. Combined Raman and photoluminescence studies with the introduction of an Al2O3 dielectric layer unambiguously reveal that Raman enhancement on ReS2 materials is from a charge transfer process rather than from an energy transfer process, and Raman enhancement is inversely proportional while the photoluminescence quenching effect is proportional to the layer number (thickness) of ReS2 nanosheets. On monolayer ReS2 film, a strong resonance-enhanced Raman scattering effect dependent on the laser excitation energy is detected, and a detection limit as low as 10(-9) M can be reached from the studied dye molecules such as rhodamine 6G and methylene blue. Such a high enhancement factor achieved through enhanced charge interaction between target molecule and substrate suggests that with careful consideration of the layer-number-dependent feature and excitation-energy-related resonance effect, ReS2 is a promising Raman enhancement platform for sensing applications.