Structural characterization and plasmonic properties of two-dimensional arrays of hydrophobic large gold nanoparticles fabricated by Langmuir-Blodgett technique

Takuya Ishida, Yuki Tachikiri, Takayuki Sako, Yukina Takahashi, Sunao Yamada

    研究成果: ジャーナルへの寄稿学術誌査読

    17 被引用数 (Scopus)

    抄録

    We have succeeded in fabricating two-dimensional (2D) arrays of larger gold nanoparticles (AuNPs) (diameters 17, 28, and 48 nm) by Langmuir-Blodgett (LB) method. Although the particle size of AuNPs is one of the most important factors in order to control the optical properties of 2D arrays, there have been reported only the size of less than ∼20 nm. This is a first report on the bottom-up fabrication of 2D arrays consisting of hydrophobic AuNP with the diameter of ∼50 nm, of which the size is expected to obtain maximum near-field effects. Octadecylthiolate-capped AuNPs (ODT-AuNPs) which were prepared by our method could be re-dispersed in chloroform even after drying completely, realizing the spreading of the colloidal chloroform solution onto the water surface. Accordingly, densely-packed 2D LB films of ODT-AuNPs could be fabricated on an indium-tin-oxide substrate, when water as the subphase and polyethylene glycol (PEG) as an amphiphilic agent were used. PEG played an important role to form densely-packed film uniformly due to increasing affinity between hydrophobic AuNP and water. Absorption spectra of the films revealed that the resonance wavelengths of plasmon oscillation through interparticle plasmon coupling were clearly correlated with the particle sizes rather than deposition densities.

    本文言語英語
    ページ(範囲)350-356
    ページ数7
    ジャーナルApplied Surface Science
    404
    DOI
    出版ステータス出版済み - 5月 15 2017

    !!!All Science Journal Classification (ASJC) codes

    • 化学 (全般)
    • 凝縮系物理学
    • 物理学および天文学(全般)
    • 表面および界面
    • 表面、皮膜および薄膜

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