合成与表征Au@MnO2纳米粒子作为等离子体增强光谱基底

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Brazilian Chemical Society Pub Date : 2023-05-26 DOI:10.21577/0103-5053.20220146

Gabriela P. Oliveira, T. Neves, L. Peixoto, S. Landi, B. Archanjo, Gustavo F. S. Andrade

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引用次数: 0

摘要

金纳米粒子(AuNP)的等离子体性质受到纳米粒子之间强相互作用引起的聚集和沉淀的强烈影响，从而可以观察到增强的光谱效应。为了避免AuNP聚集和沉淀，本研究提出了MnO2涂层，形成AuNP@MnO2核壳结构。MnO2层的厚度为1 ~ 10nm，因此获得了高度表面增强的荧光，其中5nm厚的MnO2的荧光强度最大。尽管表面增强拉曼散射(SERS)强度随着吸附表面距离的增加而固有地降低，但拉曼强度的降低是可以控制的。拉曼强度的降低通过MnO2壳层引起的AuNP稳定性的增加来补偿。

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Synthesis and Characterization of Au@MnO2 Nanoparticles as Plasmon Enhanced Spectroscopy Substrates

The plasmonic properties of Au nanoparticles (AuNP), which allow the observation of enhanced spectroscopic effects, are strongly affected by the aggregation and precipitation caused by the strong interactions between nanoparticles. To avoid AuNP aggregation and precipitation, the present study proposes coating with MnO2, forming AuNP@MnO2 core-shell structures. The MnO2 layers presented 1-10 nm thickness so that highly surface-enhanced fluorescence was obtained with maximum intensity given by 5 nm thick MnO2. The decrease in Raman intensity could be controlled, despite the inherent reduction in surface-enhanced Raman scattering (SERS) intensity with increasing adsorbate-surface distance. The decrease in Raman intensity was compensated by increasing AuNP stability caused by the MnO2 shell.

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来源期刊

Journal of the Brazilian Chemical Society 化学-化学综合

CiteScore

2.90

自引率

7.10%

发文量

审稿时长

3.4 months

期刊介绍： The Journal of the Brazilian Chemical Society embraces all aspects of chemistry except education, philosophy and history of chemistry. It is a medium for reporting selected original and significant contributions to new chemical knowledge.