罗丹明6G
材料科学
二硫化钼
拉曼散射
拉曼光谱
密度泛函理论
基质(水族馆)
化学物理
过渡金属
惰性
金属
纳米技术
化学
计算化学
分子
催化作用
光学
冶金
物理
生物化学
海洋学
有机化学
地质学
作者
Haowen He,Fengxue Tan,Yingjiao Zhai,Fujun Liu,Dengkui Wang,Xuan Fang,Jinhua Li,Sophie Thétiot-Laurent
出处
期刊:Small
[Wiley]
日期:2024-09-17
标识
DOI:10.1002/smll.202404684
摘要
Abstract Two‐dimensional molybdenum disulfide (2D MoS 2 ) shows great promise as a surface‐enhanced Raman scattering (SERS) substrate due to its strong exciton resonance. However, the inert basal plane limits the performance of SERS. In this work, a strategy is proposed for the one‐step synthesis of atomically basal defect‐rich MoS 2 . The study first reveals that NaCl plays a two‐stage role in the growth process, where NaCl initially promotes the rapid growth of large MoS 2 as previously reported, and then promotes the formation of atomic basal defects dominated by single sulfur vacancies. Additionally, spectral changes induced by modulation of experimental parameters and density function theory calculation show that defect generation occurs during cooling. Meanwhile, the ratio of to A 1g in defect‐rich MoS 2 exhibits different variation trends compared with pristine MoS 2 in power‐dependent Raman, and the ratio increases with increasing basal defects. In SERS tests, the limit of detection for rhodamine 6G reached 10 −9 m , which is comparable to the performance of conventional noble metal SERS substrate. The activation strategy of the inert basal plane is applicable to other 2D transition metal dichalcogenides, and further has the potential to enhance performance in other domains, such as SERS and hydrogen evolution reactions.
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