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Plasmon-enhanced photocatalytic activity of Pt@Au and Pt@Cu nanoparticles in quantum size regime

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Abstract

We have synthesized Pt@Au and Pt@Cu bimetallic nanoparticles and investigated their surface plasmon resonance (SPR) and plasmon-enhanced photocatalytic activity in the quantum size regime. The SPR wavelength of Pt@Au bimetallic nanoparticles monotonously blue-shifts as the thickness of Pt shell increases comparing with the quantum-sized Au core nanoparticles with diameter dAu = 3.6 ± 0.4 nm. On the other hand, the SPR of Pt@Cu bimetallic nanoparticles blue-shifts at first and then red-shifts as the Pt shell thickness increases comparing to the quantum-sized Cu core nanoparticles with diameter dCu = 3.7 ± 0.5 nm. Then, we comparatively investigated the photocatalytic activities of the Pt@Au nanoparticles with quantum and classical sizes. The photocatalytic rate for 4-NP:NaBH4 is enhanced 2 times by the strong plasmon resonance and the large surface area/volume ratio of quantum-sized Pt@Au nanoparticles. Additionally, the increasing photocatalytic activity of the quantum-sized Pt@Cu with the increase of Pt shell thickness is also observed. These findings reveal the significance of the quantum plasmon resonance on the enhancement of photocatalytic activity.

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Funding

This study was funded by the National Key R&D Program of China (Grant No. 2017YFA0303402), the National Natural Science Foundation of China (Grant Nos. 91750113, No.11874293, and No. 11674254), China postdoctoral Science Foundation (Grant No. 2017T100568), and Hubei Provincial Natural Science Foundation of China (Grant No. 2018CFB572).

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Y. J. L. and S. J. D. prepared the samples, recorded absorption spectra, and performed experimental data analysis. K. C. and Y. X. helped with data analysis. Y. J. L. and S. J. D. performed photocatalysis measurements. K. C. performed TEM measurements. D. J. Y. helped with theoretical analysis. L. Z. and Q. Q. W. were responsible for the experimental design, theoretical analysis, and interpretation as well as writing, revision, and finalization of the manuscript.

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Correspondence to Qu-Quan Wang.

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Lin, YJ., Ding, SJ., Chen, K. et al. Plasmon-enhanced photocatalytic activity of Pt@Au and Pt@Cu nanoparticles in quantum size regime. J Nanopart Res 21, 137 (2019). https://doi.org/10.1007/s11051-019-4581-7

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  • DOI: https://doi.org/10.1007/s11051-019-4581-7

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