Fabrication and Unique Optical Properties of Two-Dimensional Silver Nanorod Arrays with Nanometer Gaps on a Silicon Substrate from a Self-Assembled Template of Diblock Copolymer

Shigenori Fujikawa; Mari Koizumi; Akiko Taino; Koichi Okamoto

doi:10.1021/acs.langmuir.6b02934

Fabrication and Unique Optical Properties of Two-Dimensional Silver Nanorod Arrays with Nanometer Gaps on a Silicon Substrate from a Self-Assembled Template of Diblock Copolymer

Shigenori Fujikawa, Mari Koizumi, Akiko Taino, Koichi Okamoto

Department of Fundamental Organic Chemistry

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

4 Citations (Scopus)

Abstract

A periodic array of nanoholes was fabricated via the self-assembly of a polystyrene(PS)-b-poly(methyl methacrylate) (PMMA) block copolymer (BCP) on a silicon substrate and selective etching of the PMMA moieties. Silver nanorods (AgNRs) were then selectively deposited in the nanoholes by a galvanic displacement reaction where the pattern was hexagonally aligned according to the template. The diameter of AgNRs was controlled by changing the immersion time. Optical measurements of the AgNR arrays revealed that the extinction peak was split into two because of the electromagnetically induced transparency effect. In addition, the AgNR arrays showed a surface-enhanced Raman scattering response and were successfully transferred from a silicon substrate to a transparent and flexible polymer film while retaining the rod arrangement.

Original language	English
Pages (from-to)	12504-12510
Number of pages	7
Journal	Langmuir
Volume	32
Issue number	47
DOIs	https://doi.org/10.1021/acs.langmuir.6b02934
Publication status	Published - Nov 29 2016

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/acs.langmuir.6b02934

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title = "Fabrication and Unique Optical Properties of Two-Dimensional Silver Nanorod Arrays with Nanometer Gaps on a Silicon Substrate from a Self-Assembled Template of Diblock Copolymer",

abstract = "A periodic array of nanoholes was fabricated via the self-assembly of a polystyrene(PS)-b-poly(methyl methacrylate) (PMMA) block copolymer (BCP) on a silicon substrate and selective etching of the PMMA moieties. Silver nanorods (AgNRs) were then selectively deposited in the nanoholes by a galvanic displacement reaction where the pattern was hexagonally aligned according to the template. The diameter of AgNRs was controlled by changing the immersion time. Optical measurements of the AgNR arrays revealed that the extinction peak was split into two because of the electromagnetically induced transparency effect. In addition, the AgNR arrays showed a surface-enhanced Raman scattering response and were successfully transferred from a silicon substrate to a transparent and flexible polymer film while retaining the rod arrangement.",

author = "Shigenori Fujikawa and Mari Koizumi and Akiko Taino and Koichi Okamoto",

note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research (B) (no. 26286016) and a Grant-in-Aid for Scientific Research (S) (no. 25220805) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan and a JSPS Kakenhi Grant (no. 16H06513). We gratefully acknowledge financial support from JST ACT-C (no. 24550126). This work was partially supported by the International Institute for Carbon Neutral Energy Research (WPI-I2CNER), sponsored by the World Premier International Research Center Initiative (WPI), MEXT, Japan. K.O. acknowledges the support from JSPS KAKENHI (no. 26289109 and 15H05732). Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

year = "2016",

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doi = "10.1021/acs.langmuir.6b02934",

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AU - Fujikawa, Shigenori

AU - Koizumi, Mari

AU - Taino, Akiko

AU - Okamoto, Koichi

N1 - Funding Information: This work was supported by a Grant-in-Aid for Scientific Research (B) (no. 26286016) and a Grant-in-Aid for Scientific Research (S) (no. 25220805) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan and a JSPS Kakenhi Grant (no. 16H06513). We gratefully acknowledge financial support from JST ACT-C (no. 24550126). This work was partially supported by the International Institute for Carbon Neutral Energy Research (WPI-I2CNER), sponsored by the World Premier International Research Center Initiative (WPI), MEXT, Japan. K.O. acknowledges the support from JSPS KAKENHI (no. 26289109 and 15H05732). Publisher Copyright: © 2016 American Chemical Society.

PY - 2016/11/29

Y1 - 2016/11/29

N2 - A periodic array of nanoholes was fabricated via the self-assembly of a polystyrene(PS)-b-poly(methyl methacrylate) (PMMA) block copolymer (BCP) on a silicon substrate and selective etching of the PMMA moieties. Silver nanorods (AgNRs) were then selectively deposited in the nanoholes by a galvanic displacement reaction where the pattern was hexagonally aligned according to the template. The diameter of AgNRs was controlled by changing the immersion time. Optical measurements of the AgNR arrays revealed that the extinction peak was split into two because of the electromagnetically induced transparency effect. In addition, the AgNR arrays showed a surface-enhanced Raman scattering response and were successfully transferred from a silicon substrate to a transparent and flexible polymer film while retaining the rod arrangement.

AB - A periodic array of nanoholes was fabricated via the self-assembly of a polystyrene(PS)-b-poly(methyl methacrylate) (PMMA) block copolymer (BCP) on a silicon substrate and selective etching of the PMMA moieties. Silver nanorods (AgNRs) were then selectively deposited in the nanoholes by a galvanic displacement reaction where the pattern was hexagonally aligned according to the template. The diameter of AgNRs was controlled by changing the immersion time. Optical measurements of the AgNR arrays revealed that the extinction peak was split into two because of the electromagnetically induced transparency effect. In addition, the AgNR arrays showed a surface-enhanced Raman scattering response and were successfully transferred from a silicon substrate to a transparent and flexible polymer film while retaining the rod arrangement.

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Fabrication and Unique Optical Properties of Two-Dimensional Silver Nanorod Arrays with Nanometer Gaps on a Silicon Substrate from a Self-Assembled Template of Diblock Copolymer

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