A versatile method for surface functionalization and hydrophobization of gold nanoparticles

Takuya Ishida, Yohei Yanaga, Sunao Yamada, Yukina Takahashi

研究成果: Contribution to journalArticle査読

抄録

A convenient, one-step, approach for surface modification with hydrophobic thiol or its dye-derivative of hydrophilic citrate-capped Au nanoparticles (Cit–AuNPs) is demonstrated. This method depended on the solubility of both Cit–AuNP and thiol or its derivative in the reaction solvent. We investigated a variety of solvents for Cit–AuNPs with 15–75 nm sizes and a capping molecule, octadecanethiol (ODT) or a disulfide derivative of hydrophobic porphyrin (PC10S)2. As to ODT, surface immobilization of Cit–AuNPs with ODT was successful in 2-propanol, while N,N-dimethylformamide was best in the case of (PC10S)2. In both cases, surface modified AuNPs were redispersible even after storing under dried powder conditions. Two-dimensional monoparticle films of surface-modified AuNPs by the Langmuir–Blodgett method with ethylene glycol as subphase could be formed and exhibit surface-enhanced Raman scattering. Spectra from the porphyrin skeleton were certainly observed, with the maximum photoluminescence enhancement of 15-fold, around 50-nm size. As to AuNP with 17-nm diameter, mixed monolayer assemblies of (PC10S)2 and octanethiol with different concentration ratios were fabricated and spectroscopic enhancement effects due to localized surface plasmon resonance were investigated.

本文言語英語
論文番号148932
ジャーナルApplied Surface Science
546
DOI
出版ステータス出版済み - 4 30 2021

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

フィンガープリント

「A versatile method for surface functionalization and hydrophobization of gold nanoparticles」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル