4.7 Article

In-Situ Monitoring the SERS Spectra of para-Aminothiophenol Adsorbed on Plasmon-Tunable Au@Ag Core-Shell Nanostars

期刊

NANOMATERIALS
卷 12, 期 7, 页码 -

出版社

MDPI
DOI: 10.3390/nano12071156

关键词

plasmon-driven photocatalysis; SERS; nanostars; resonant excitation

资金

  1. Natural Science Foundation of China [52072373, 21673245, 51632009, 91963202, 52102324]
  2. Key Research Program of Frontier Sciences, CAS [QYZDJ-SSW-SLH046]
  3. Presidential Foundation of Hefei Institutes of Physical Science, CAS [BJPY2021B04, YZJJZX202019]
  4. Hefei National Laboratory for Physical Sciences at the Microscale [KF2020109]
  5. Collaborative Innovation Program of Hefei Science Center, CAS [2020HSC-CIP013]

向作者/读者索取更多资源

This study demonstrates the controlled plasmon-mediated oxidation of para-aminothiophenol (p-ATP) using Au@Ag core-shell nanostars with tunable tip plasmons as reactors. The results show that plasmon bands of metal nanostructures play an important role in the efficiency of plasmon-driven photocatalysis.
Plasmon-induced photocatalysis on noble metal surfaces has attracted broad attention due to its application in sunlight energy conversion, while the selectivity of plasmonic platforms remains unclear. Herein, we present the controlled plasmon-mediated oxidation of para-aminothiophenol (p-ATP) by employing Au@Ag core-shell nanostars with tunable tip plasmons in visible-near-infrared range as reactors. In-situ Raman measurements indicate that Au@Ag core-shell nanostars essentially promote the conversion of p-ATP to 4,4 '-dimercaptoazobenzene (DMAB) due to hot carriers excited by localized surface plasmon resonance. Au@Ag nanostars with plasmon modes under resonant light excitation suggested higher catalytic efficiency, as evidenced by the larger intensity ratios between 1440 cm(-1) (N=N stretching of DMAB) and 1080 cm(-1) shifts (C-S stretching of p-ATP). Importantly, the time-dependent surface-enhanced Raman scattering spectra showed that the conversion efficiency of p-ATP was mainly dictated by the resonance condition between the tip plasmon mode of Au@Ag core-shell nanostars and the excitation light, as well as the choice of excitation wavelength. These results show that plasmon bands of metal nanostructures play an important role in the efficiency of plasmon-driven photocatalysis.

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