Large-Scale Uniform Two-Dimensional Hexagonal Arrays of Gold Nanoparticles Templated from Mesoporous Silica Film for Surface-Enhanced Raman Spectroscopy

Yi Wen Wang; Kun Che Kao; Juen Kai Wang; Chung Yuan Mou

doi:10.1021/acs.jpcc.6b08116

Large-Scale Uniform Two-Dimensional Hexagonal Arrays of Gold Nanoparticles Templated from Mesoporous Silica Film for Surface-Enhanced Raman Spectroscopy

Yi Wen Wang, Kun Che Kao, Juen Kai Wang, Chung Yuan Mou

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

A good surface-enhanced Raman spectroscopy (SERS) substrate requires precise control of the enhancement factor in large area which may be achieved with large-scale hot spot engineering. Here, we present a facile method for synthesizing 2-D hexagonally patterned gold nanoparticle arrays on centimeter-sized substrates of mesoporous silica thin films with vertical nanochannels by chemical reduction. Scanning electron microscopy images showed densely packed gold nanoparticles directly anchored on the openings of vertical mesopores (∼5 nm) leading to 2 nm nanogaps between the gold nanoparticles. The gold nanoparticle arrays showed red-shifted localized surface plasmon resonance spectra due to strong couplings between close-packed gold. The dense on-substrate 2 nm plasmonic nanogaps lead to highly enhanced local electric field and excellent macroscopic uniformity in SERS.

Original language	English
Pages (from-to)	24382-24388
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	120
Issue number	42
DOIs	https://doi.org/10.1021/acs.jpcc.6b08116
Publication status	Published - Oct 27 2016
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/acs.jpcc.6b08116

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title = "Large-Scale Uniform Two-Dimensional Hexagonal Arrays of Gold Nanoparticles Templated from Mesoporous Silica Film for Surface-Enhanced Raman Spectroscopy",

abstract = "A good surface-enhanced Raman spectroscopy (SERS) substrate requires precise control of the enhancement factor in large area which may be achieved with large-scale hot spot engineering. Here, we present a facile method for synthesizing 2-D hexagonally patterned gold nanoparticle arrays on centimeter-sized substrates of mesoporous silica thin films with vertical nanochannels by chemical reduction. Scanning electron microscopy images showed densely packed gold nanoparticles directly anchored on the openings of vertical mesopores (∼5 nm) leading to 2 nm nanogaps between the gold nanoparticles. The gold nanoparticle arrays showed red-shifted localized surface plasmon resonance spectra due to strong couplings between close-packed gold. The dense on-substrate 2 nm plasmonic nanogaps lead to highly enhanced local electric field and excellent macroscopic uniformity in SERS.",

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AU - Kao, Kun Che

AU - Wang, Juen Kai

AU - Mou, Chung Yuan

PY - 2016/10/27

Y1 - 2016/10/27

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AB - A good surface-enhanced Raman spectroscopy (SERS) substrate requires precise control of the enhancement factor in large area which may be achieved with large-scale hot spot engineering. Here, we present a facile method for synthesizing 2-D hexagonally patterned gold nanoparticle arrays on centimeter-sized substrates of mesoporous silica thin films with vertical nanochannels by chemical reduction. Scanning electron microscopy images showed densely packed gold nanoparticles directly anchored on the openings of vertical mesopores (∼5 nm) leading to 2 nm nanogaps between the gold nanoparticles. The gold nanoparticle arrays showed red-shifted localized surface plasmon resonance spectra due to strong couplings between close-packed gold. The dense on-substrate 2 nm plasmonic nanogaps lead to highly enhanced local electric field and excellent macroscopic uniformity in SERS.

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Large-Scale Uniform Two-Dimensional Hexagonal Arrays of Gold Nanoparticles Templated from Mesoporous Silica Film for Surface-Enhanced Raman Spectroscopy

Abstract

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