Systematic investigation of the SERS efficiency and SERS hotspots in gas-phase deposited Ag nanoparticle assemblies

L.B. He, Y.L. Wang, X. Xie, M. Han, F.Q. Song, B.J. Wang, W.L. Cheng, H.X. Xu, L.T. Sun

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Gas-phase deposited Ag nanoparticle assemblies are one of the most commonly used plasmonic
substrates benefiting from their remarkable advantages such as clean particle surface, tunable particle density, available inter-particle gaps, low-cost and scalable fabrication, and excellent industry compatibility. However, their performance efficiencies are difficult to optimize due to the lack of knowledge of the hotspots inside their structures. We here report a design of delicate rainbow-like Ag nanoparticle assemblies, based on which the hotspots can be revealed through a combinatorial approach. The findings show that the hotspots in gas-phase deposited Ag nanoparticle assemblies are uniquely entangled by the excitation energy and specific inter-particle gaps, differing from the matching conditions in periodic arrays. For Ag nanoparticle assemblies deposited on Formvar-filmed substrates, the mean particle size is maintained around 10 nm, while the particle density can be widely tuned. The one possessing the highest SERS efficiency (under 473 nm excitation) have a particle number density of around 7100 mm2. Gaps with an inter-particle spacing of around 3 nm are found to serve as SERS hotspots, and these hotspots contribute to 68% of the overall SERS intensity. For Ag nanoparticle assemblies fabricated on carbonfilmed substrates, the mean particle size can be feasibly tuned. The one possessing the highest SERS efficiency under 473 nm excitation has a particle number density of around 460 mm2 and a mean particle size of around 42.1 nm. The construction of Ag–analyte–Ag sandwich-like nanoparticle assemblies by a two-step-deposition method slightly improves the SERS efficiency when the particle number density is low, but suppresses the SERS efficiency when the particle number density is high.
Original languageEnglish
Pages (from-to)5091-5101
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume19
Issue number7
DOIs
Publication statusPublished - 2017

Cite this

He, L.B. ; Wang, Y.L. ; Xie, X. ; Han, M. ; Song, F.Q. ; Wang, B.J. ; Cheng, W.L. ; Xu, H.X. ; Sun, L.T. / Systematic investigation of the SERS efficiency and SERS hotspots in gas-phase deposited Ag nanoparticle assemblies. In: Physical Chemistry Chemical Physics. 2017 ; Vol. 19, No. 7. pp. 5091-5101.
@article{af36ebcaf1a8421dba2fa4b93af49fce,
title = "Systematic investigation of the SERS efficiency and SERS hotspots in gas-phase deposited Ag nanoparticle assemblies",
abstract = "Gas-phase deposited Ag nanoparticle assemblies are one of the most commonly used plasmonicsubstrates benefiting from their remarkable advantages such as clean particle surface, tunable particle density, available inter-particle gaps, low-cost and scalable fabrication, and excellent industry compatibility. However, their performance efficiencies are difficult to optimize due to the lack of knowledge of the hotspots inside their structures. We here report a design of delicate rainbow-like Ag nanoparticle assemblies, based on which the hotspots can be revealed through a combinatorial approach. The findings show that the hotspots in gas-phase deposited Ag nanoparticle assemblies are uniquely entangled by the excitation energy and specific inter-particle gaps, differing from the matching conditions in periodic arrays. For Ag nanoparticle assemblies deposited on Formvar-filmed substrates, the mean particle size is maintained around 10 nm, while the particle density can be widely tuned. The one possessing the highest SERS efficiency (under 473 nm excitation) have a particle number density of around 7100 mm2. Gaps with an inter-particle spacing of around 3 nm are found to serve as SERS hotspots, and these hotspots contribute to 68{\%} of the overall SERS intensity. For Ag nanoparticle assemblies fabricated on carbonfilmed substrates, the mean particle size can be feasibly tuned. The one possessing the highest SERS efficiency under 473 nm excitation has a particle number density of around 460 mm2 and a mean particle size of around 42.1 nm. The construction of Ag–analyte–Ag sandwich-like nanoparticle assemblies by a two-step-deposition method slightly improves the SERS efficiency when the particle number density is low, but suppresses the SERS efficiency when the particle number density is high.",
author = "L.B. He and Y.L. Wang and X. Xie and M. Han and F.Q. Song and B.J. Wang and W.L. Cheng and H.X. Xu and L.T. Sun",
year = "2017",
doi = "10.1039/c6cp08513j",
language = "English",
volume = "19",
pages = "5091--5101",
journal = "Physical Chemistry Chemical Physics",
issn = "1463-9076",
publisher = "The Royal Society of Chemistry",
number = "7",

}

Systematic investigation of the SERS efficiency and SERS hotspots in gas-phase deposited Ag nanoparticle assemblies. / He, L.B. ; Wang, Y.L.; Xie, X.; Han, M.; Song, F.Q.; Wang, B.J. ; Cheng, W.L.; Xu, H.X. ; Sun, L.T.

In: Physical Chemistry Chemical Physics, Vol. 19, No. 7, 2017, p. 5091-5101.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Systematic investigation of the SERS efficiency and SERS hotspots in gas-phase deposited Ag nanoparticle assemblies

AU - He, L.B.

AU - Wang, Y.L.

AU - Xie, X.

AU - Han, M.

AU - Song, F.Q.

AU - Wang, B.J.

AU - Cheng, W.L.

AU - Xu, H.X.

AU - Sun, L.T.

PY - 2017

Y1 - 2017

N2 - Gas-phase deposited Ag nanoparticle assemblies are one of the most commonly used plasmonicsubstrates benefiting from their remarkable advantages such as clean particle surface, tunable particle density, available inter-particle gaps, low-cost and scalable fabrication, and excellent industry compatibility. However, their performance efficiencies are difficult to optimize due to the lack of knowledge of the hotspots inside their structures. We here report a design of delicate rainbow-like Ag nanoparticle assemblies, based on which the hotspots can be revealed through a combinatorial approach. The findings show that the hotspots in gas-phase deposited Ag nanoparticle assemblies are uniquely entangled by the excitation energy and specific inter-particle gaps, differing from the matching conditions in periodic arrays. For Ag nanoparticle assemblies deposited on Formvar-filmed substrates, the mean particle size is maintained around 10 nm, while the particle density can be widely tuned. The one possessing the highest SERS efficiency (under 473 nm excitation) have a particle number density of around 7100 mm2. Gaps with an inter-particle spacing of around 3 nm are found to serve as SERS hotspots, and these hotspots contribute to 68% of the overall SERS intensity. For Ag nanoparticle assemblies fabricated on carbonfilmed substrates, the mean particle size can be feasibly tuned. The one possessing the highest SERS efficiency under 473 nm excitation has a particle number density of around 460 mm2 and a mean particle size of around 42.1 nm. The construction of Ag–analyte–Ag sandwich-like nanoparticle assemblies by a two-step-deposition method slightly improves the SERS efficiency when the particle number density is low, but suppresses the SERS efficiency when the particle number density is high.

AB - Gas-phase deposited Ag nanoparticle assemblies are one of the most commonly used plasmonicsubstrates benefiting from their remarkable advantages such as clean particle surface, tunable particle density, available inter-particle gaps, low-cost and scalable fabrication, and excellent industry compatibility. However, their performance efficiencies are difficult to optimize due to the lack of knowledge of the hotspots inside their structures. We here report a design of delicate rainbow-like Ag nanoparticle assemblies, based on which the hotspots can be revealed through a combinatorial approach. The findings show that the hotspots in gas-phase deposited Ag nanoparticle assemblies are uniquely entangled by the excitation energy and specific inter-particle gaps, differing from the matching conditions in periodic arrays. For Ag nanoparticle assemblies deposited on Formvar-filmed substrates, the mean particle size is maintained around 10 nm, while the particle density can be widely tuned. The one possessing the highest SERS efficiency (under 473 nm excitation) have a particle number density of around 7100 mm2. Gaps with an inter-particle spacing of around 3 nm are found to serve as SERS hotspots, and these hotspots contribute to 68% of the overall SERS intensity. For Ag nanoparticle assemblies fabricated on carbonfilmed substrates, the mean particle size can be feasibly tuned. The one possessing the highest SERS efficiency under 473 nm excitation has a particle number density of around 460 mm2 and a mean particle size of around 42.1 nm. The construction of Ag–analyte–Ag sandwich-like nanoparticle assemblies by a two-step-deposition method slightly improves the SERS efficiency when the particle number density is low, but suppresses the SERS efficiency when the particle number density is high.

U2 - 10.1039/c6cp08513j

DO - 10.1039/c6cp08513j

M3 - Article

VL - 19

SP - 5091

EP - 5101

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

IS - 7

ER -