石墨烯
材料科学
表面等离子共振
等离子体子
拉曼散射
半导体
复合数
氧化物
肖特基势垒
贵金属
纳米颗粒
基质(水族馆)
拉曼光谱
纳米技术
金属
光电子学
复合材料
光学
冶金
海洋学
二极管
地质学
物理
作者
Shuhan Di,Shuang Guo,Yi‐Ting Wang,Wei Wang,Young Mee Jung,Lei Chen,Li Wang
标识
DOI:10.1016/j.matchemphys.2023.127621
摘要
We designed the [email protected]2O core-shell structure in situ growth on the reduced graphene oxide (rGO). The proposed [email protected]2O-rGO composite demonstrated superior surface-enhanced Raman scattering (SERS) activity for quantitative analysis of the targets. In this study, the Ag nanoparticles (NPs) produce strong surface plasmon resonance (SPR), and Cu2O has advantages such as a narrow band gap and a strong ability to capture visible light. Most importantly, the Schottky effect in the noble metal/semiconductor composite promotes high SERS activity. The two-dimensional material was used as a platform to promote electron transport between the noble metal and semiconductor. It was found that SERS enhancement is dependent on the thickness of the shell, which was affected by the transfer of hot electrons and the contribution of the SPR of Ag NPs. As the Cu2O shell thickness is 16 nm, its addition not only increases the molecular adsorption capacity but also does not affect the SPR of Ag due to its thinness. In addition, 10−9 M methylene blue can easily be detected on the optimal [email protected]2O-rGO composite. This study proves that the [email protected]2O-rGO composite SERS substrate has high sensitivity, and is expected to be widely used in environmental monitoring, medical inspection, food supervision, and other aspects in the future.
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