Phase-Engineered Transition Metal Dichalcogenides for Highly Efficient Surface-Enhanced Raman Scattering.

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-11-13 Epub Date: 2024-11-04 DOI:10.1021/acs.nanolett.4c03924

Ying Zhang, Zhenyu Shi, Haoyun Cui, Quankun Xia, Fengping Liu, Zhenhai Wang, Jia Wang, Huacheng Fan, Chi Shu, Bo Chen, Hai Li, Zhuangchai Lai, Zhimin Luo, Wei Zheng, Lianhui Wang, Zhiwei Huang

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Abstract

Phase engineering of two-dimensional (2D) transition metal dichalcogenides (TMDs) is an attractive avenue to construct new surface-enhanced Raman scattering (SERS) substrates. Herein, 2D WS₂ and MoS₂ monolayers with high-purity distorted octahedral phase (1T') are prepared for highly sensitive SERS detection of analytes (e.g., rhodamine 6G, rhodamine B and crystal violet). 1T'-WS₂ and 1T'-MoS₂ monolayers show the detection limits of 8.28 × 10^-12 and 8.57 × 10^-11 M for rhodamine 6G, with the enhancement factors of 4.6 × 10⁸ and 3.9 × 10⁷, respectively, which are comparable to noble-metal substrates, outperforming semiconducting 2H-W(Mo)S₂ monolayers and most of the reported non-noble-metal substrates. First-principles density functional theory calculations show that their Raman enhancement effect is mainly ascribed to highly efficient interfacial charge transfer between the 1T'-W(Mo)S₂ monolayers and analytes. Our study reveals that 2D TMDs with semimetallic 1T' phase are promising as next-generation SERS substrates.

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用于高效表面增强拉曼散射的相工程过渡金属二卤化物。

二维（2D）过渡金属二卤化物（TMDs）的相工程是构建新型表面增强拉曼散射（SERS）基底的一条极具吸引力的途径。本文制备了具有高纯度扭曲八面体相（1T'）的二维 WS2 和 MoS2 单层，用于高灵敏度 SERS 检测分析物（如罗丹明 6G、罗丹明 B 和结晶紫）。1T'-WS2 和 1T'-MoS2 单层对罗丹明 6G 的检测限分别为 8.28 × 10-12 和 8.57 × 10-11 M，增强因子分别为 4.6 × 108 和 3.9 × 107，与惰性金属基底相当，优于半导体 2H-W(Mo)S2 单层和大多数已报道的非惰性金属基底。第一原理密度泛函理论计算表明，它们的拉曼增强效应主要归因于 1T'-W(Mo)S2 单层与分析物之间高效的界面电荷转移。我们的研究表明，具有半金属 1T' 相的二维 TMDs 很有希望成为下一代 SERS 基底。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

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