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

34 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
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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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.",

author = "Wang, {Yi Wen} and Kao, {Kun Che} and Wang, {Juen Kai} and Mou, {Chung Yuan}",

note = "Funding Information: This research was funded by MOST (Ministry of Science and Technology), Taiwan. Valuable discussion with Dr. Peilin Chen is acknowledged. We thank Ching-Yen Lin, Ya-Yun Yang, Su-Jen Ji, and Chia-Ying Chien at the Instrument Center of National Taiwan University for assistance with SEM and TEM, and Drs. Mykhaylo M. Dvoynenko and Yu-Chi Chang for helping in dark-field scattering spectroscopy. Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

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doi = "10.1021/acs.jpcc.6b08116",

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AU - Wang, Yi Wen

AU - Kao, Kun Che

AU - Wang, Juen Kai

AU - Mou, Chung Yuan

N1 - Funding Information: This research was funded by MOST (Ministry of Science and Technology), Taiwan. Valuable discussion with Dr. Peilin Chen is acknowledged. We thank Ching-Yen Lin, Ya-Yun Yang, Su-Jen Ji, and Chia-Ying Chien at the Instrument Center of National Taiwan University for assistance with SEM and TEM, and Drs. Mykhaylo M. Dvoynenko and Yu-Chi Chang for helping in dark-field scattering spectroscopy. Publisher Copyright: © 2016 American Chemical Society.

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N2 - 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.

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

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