Close-Packed Two-Dimensional Silver Nanoparticle Arrays: Quadrupolar and Dipolar Surface Plasmon Resonance Coupling

Silver nanoparticles (NPs) ranging in size from 40 to 100 nm were prepared in high yield by using an improved seed‐mediated method. The homogeneous Ag NPs were used as building blocks for 2D assembled Ag NP arrays by using an oil/water interface. A close‐packed 2D array of Ag NPs was fabricated by u...

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Bibliographic Details
Published in:Chemistry : a European journal 2015-04, Vol.21 (16), p.6165-6172
Main Authors: Yun, Sukang, Hong, Soonchang, Acapulco Jr, Jesus A. I., Jang, Ho Young, Ham, Songyi, Lee, Kyungeun, Kim, Seong Kyu, Park, Sungho
Format: Article
Language:English
Subjects:
Arrays
Chemistry
Joining
Mathematical analysis
Nanoparticles
optical properties
Plasmons
Silver
Stretching
surface chemistry
surface plasmon resonance
Two dimensional
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Summary:Silver nanoparticles (NPs) ranging in size from 40 to 100 nm were prepared in high yield by using an improved seed‐mediated method. The homogeneous Ag NPs were used as building blocks for 2D assembled Ag NP arrays by using an oil/water interface. A close‐packed 2D array of Ag NPs was fabricated by using packing molecules (3‐mercaptopropyltrimethoxysilane) to control the interparticle spacing. The homogeneous 2D Ag NP array exhibited a strong quadrupolar cooperative plasmon mode resonance and a dipolar red‐shift relative to individual Ag NPs suspended in solution. A well‐arranged 2D Ag NP array was embedded in polydimethylsiloxane film and, with biaxial stretching to control the interparticle distance, concomitant variations of the quadrupolar and dipolar couplings were observed. As the interparticle distance increased, the intensity of the quadrupolar cooperative plasmon mode resonance decreased and dipolar coupling completely disappeared. The local electric field of the 2D Ag NP array was calculated by using finite difference time domain simulation and qualitatively showed agreement with the experimental measurements. Pushing boundaries: Silver nanoparticles (NPs) were used as building blocks for preparing 2D Ag NP arrays at an oil/water interface (see figure; scale bars 100 nm). The homogeneous 2D Ag NP array exhibits a strong quadrupolar cooperative plasmon mode resonance and a dipolar shift with biaxial stretching to control the interparticle distance. Concomitant variations of the quadrupolar and dipolar couplings are also observed.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201406454