Wang, Rui and He, Zhe and Kurouski, Dmitry (2022) Near-field and photocatalytic properties of mono- and bimetallic nanostructures monitored by nanocavity surface-enhanced Raman scattering. Nano Research . ISSN 1998-0124. doi:10.1007/s12274-022-4736-1. (In Press) https://resolver.caltech.edu/CaltechAUTHORS:20220805-204779000
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Abstract
Localized surface plasmon resonances (LSPR) generated in a particle-film nanocavity enhance electric fields within a nanoscale volume. LSPR can also decay into hot carriers, highly energetic species that catalyze photocatalytic reactions in molecular analytes located in close proximity to metal surfaces. In this study, we examined the intensity of the electric field (near-field) and photocatalytic properties of plasmonic nanocavities formed by single nanoparticles (SNP) on single nanoplates (SNL). Using 4-nitrobenzenethiol (4-NBT) as a molecular reporter, we determined the near-field responses, as well as measured rates of 4-NBT dimerization into 4,4-dimercaptoazobenzene (DMAB) in the gold (Au) SNP on AuSNL nanocavity (Au-Au), as well as in AuSNP on AgSNL (Au-Ag), AgSNP on AuSNL (Ag-Au), and AgSNP on AgSNL (Ag-Ag) nanocavities using 532, 660, and 785 nm excitations. We observed the strongest near-field signals of 4-NBT at 660 nm in all examined plasmonic systems that is found to be substantially red-shifted relative to the LSPR of the corresponding nanoparticles. We also found that rates of DMAB formation were significantly greater in heterometal nanocavities (Au-Ag and Ag-Au) compared to their monometallic counterparts (Au-Au and Ag-Ag). These results point to drastic differences in plasmonic and photocatalytic properties of mono and bimetallic nanostructures.
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| Additional Information: | © 2022 Springer Nature. Received 09 May 2022. Revised 28 June 2022. Accepted 03 July 2022. Published 05 August 2022. We are grateful to AgriLife Research of Texas A&M for the provided financial support. We also acknowledge Governor’s University Research Initiative (GURI) grant program of Texas A&M University, GURI Grant Agreement No. 12-2016, M1700437. R. W. acknowledges the financial support from the State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University (No. SKLACLS2215). Rui Wang and Zhe He contributed equally to this work. | |||||||||
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| Subject Keywords: | bimetal photocatalysis surface-enhanced Raman spectroscopy (SERS); plasmonic nanocavity; hot electrons; plasmon-induced photocatalysis | |||||||||
| DOI: | 10.1007/s12274-022-4736-1 | |||||||||
| Record Number: | CaltechAUTHORS:20220805-204779000 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20220805-204779000 | |||||||||
| Official Citation: | Wang, R., He, Z. & Kurouski, D. Near-field and photocatalytic properties of mono- and bimetallic nanostructures monitored by nanocavity surface-enhanced Raman scattering. Nano Res. (2022). https://doi.org/10.1007/s12274-022-4736-1 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 116152 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 09 Aug 2022 17:27 | |||||||||
| Last Modified: | 09 Aug 2022 17:27 |
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