Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection
Abstract
In this work, we develop a Ag@Al2O3@Ag plasmonic core–shell–satellite (PCSS) to achieve highly sensitive and reproducible surface-enhanced Raman spectroscopy (SERS) detection of probe molecules. To fabricate PCSS nanostructures, we employ a simple hierarchical dewetting process of Ag films coupled with an atomic layer deposition (ALD) method for the Al2O3 shell. Compared to bare Ag nanoparticles, several advantages of fabricating PCSS nanostructures are discovered, including high surface roughness, high density of nanogaps between Ag core and Ag satellites, and nanogaps between adjacent Ag satellites. Finite-difference time-domain (FDTD) simulations of the PCSS nanostructure confirm an enhancement in the electromagnetic field intensity (hotspots) in the nanogap between the Ag core and the satellite generated by the Al2O3 shell, due to the strong core–satellite plasmonic coupling. The as-prepared PCSS-based SERS substrate demonstrates an enhancement factor (EF) of 1.7 × 107 and relative standard deviation (RSD) of ~7%, endowing our SERS platform with highly sensitive and reproducible detection of R6G molecules. We think that this method provides a simple approach for the fabrication of PCSS by a solid-state technique and a basis for developing a highly SERS-active substrate for practical applications.
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC). Office of Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF); Korea Basic Science Institute (KBSI)
- OSTI Identifier:
- 1830030
- Alternate Identifier(s):
- OSTI ID: 1866975
- Report Number(s):
- LA-UR-22-20995
Journal ID: ISSN 1422-0067; IJMCFK; PII: ijms222212191
- Grant/Contract Number:
- 89233218CNA000001; 2019R1A2C1007883; D110500; C140210
- Resource Type:
- Published Article
- Journal Name:
- International Journal of Molecular Sciences (Online)
- Additional Journal Information:
- Journal Name: International Journal of Molecular Sciences (Online) Journal Volume: 22 Journal Issue: 22; Journal ID: ISSN 1422-0067
- Publisher:
- MDPI AG
- Country of Publication:
- Switzerland
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; Material Science; SERS, plasmonic core-shell-satellite, Ag nanoparticles; hotspots; FDTD
Citation Formats
Pandey, Puran, Kunwar, Sundar, Shin, Ki-Hoon, Seo, Min-Kyu, Yoon, Jongwon, Hong, Woong-Ki, and Sohn, Jung-Inn. Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection. Switzerland: N. p., 2021.
Web. doi:10.3390/ijms222212191.
Pandey, Puran, Kunwar, Sundar, Shin, Ki-Hoon, Seo, Min-Kyu, Yoon, Jongwon, Hong, Woong-Ki, & Sohn, Jung-Inn. Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection. Switzerland. https://doi.org/10.3390/ijms222212191
Pandey, Puran, Kunwar, Sundar, Shin, Ki-Hoon, Seo, Min-Kyu, Yoon, Jongwon, Hong, Woong-Ki, and Sohn, Jung-Inn. Thu .
"Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection". Switzerland. https://doi.org/10.3390/ijms222212191.
@article{osti_1830030,
title = {Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection},
author = {Pandey, Puran and Kunwar, Sundar and Shin, Ki-Hoon and Seo, Min-Kyu and Yoon, Jongwon and Hong, Woong-Ki and Sohn, Jung-Inn},
abstractNote = {In this work, we develop a Ag@Al2O3@Ag plasmonic core–shell–satellite (PCSS) to achieve highly sensitive and reproducible surface-enhanced Raman spectroscopy (SERS) detection of probe molecules. To fabricate PCSS nanostructures, we employ a simple hierarchical dewetting process of Ag films coupled with an atomic layer deposition (ALD) method for the Al2O3 shell. Compared to bare Ag nanoparticles, several advantages of fabricating PCSS nanostructures are discovered, including high surface roughness, high density of nanogaps between Ag core and Ag satellites, and nanogaps between adjacent Ag satellites. Finite-difference time-domain (FDTD) simulations of the PCSS nanostructure confirm an enhancement in the electromagnetic field intensity (hotspots) in the nanogap between the Ag core and the satellite generated by the Al2O3 shell, due to the strong core–satellite plasmonic coupling. The as-prepared PCSS-based SERS substrate demonstrates an enhancement factor (EF) of 1.7 × 107 and relative standard deviation (RSD) of ~7%, endowing our SERS platform with highly sensitive and reproducible detection of R6G molecules. We think that this method provides a simple approach for the fabrication of PCSS by a solid-state technique and a basis for developing a highly SERS-active substrate for practical applications.},
doi = {10.3390/ijms222212191},
journal = {International Journal of Molecular Sciences (Online)},
number = 22,
volume = 22,
place = {Switzerland},
year = {Thu Nov 11 00:00:00 EST 2021},
month = {Thu Nov 11 00:00:00 EST 2021}
}
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