DNA-Programmed Bimodal 2D Assembly of Differently Sized Nanoparticles via Folding of Precursory Circular Chains

Tzung Ying Yang, Li Yu, Yoshitsugu Akiyama, Tohru Takarada, Mizuo Maeda

研究成果: Contribution to journalArticle

抜粋

Gold nanoparticle (AuNP) assemblies in two-dimensions (2D) exhibit collective physical/chemical properties that are useful for various devices. However, technical issues still impede the efficient ordering of differently sized AuNPs on solid supports while avoiding phase separation. This paper describes a method to construct binary 2D assemblies by folding precursory circular chains composed of small and large AuNPs. The structural change is caused by a spontaneous, non-cross-linking assembly of fully matched double-stranded DNA-modified AuNPs (dsDNA-AuNPs) at a high ionic strength. Since larger dsDNA-AuNPs have a lower critical coagulation concentration of the supporting electrolyte, the spontaneous assembly of large AuNPs precedes that of small AuNPs in the precursory chain during evaporation. Transmission electron microscopy reveals that alternate-type AuNP chains are folded into a binary 2D structure in a mixed mode, whereas block-type chains are transformed into a binary 2D structure in a core-shell mode. The methodology could potentially be harnessed for the fabrication of binary AuNP arrays for various devices.

元の言語英語
ページ(範囲)5588-5595
ページ数8
ジャーナルLangmuir
36
発行部数20
DOI
出版物ステータス出版済み - 5 26 2020

All Science Journal Classification (ASJC) codes

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

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