Modulation of Interparticle Distance in Discrete Gold Nanoparticle Dimers and Trimers by DNA Single-Base Pairing

Yoshitsugu Akiyama, Hiroto Shikagawa, Naoki Kanayama, Tohru Takarada, Mizuo Maeda

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Self-assembled structures of metallic nanoparticles with dynamically changeable interparticle distance hold promise for the regulation of collective physical properties. This paper describes gold nanoparticle dimers and trimers that exhibit spontaneous and reversible changes in interparticle distance. To exploit this property, a gold nanoparticle is modified with precisely one long DNA strand and approximately five short DNA strands. The long DNA serves to align the nanoparticles on a template DNA via hybridization, while the short DNAs function to induce the interparticle distance changes. The obtained dimer and trimer are characterized with gel electrophoresis, dynamic light scattering measurements, and transmission electron microscopy (TEM). When the complementary short DNA is added to form the fully matched duplexes on the particle surface in the presence of MgCl2, spontaneous reduction of the interparticle distance is observed with TEM and cryo-electron microscopy. By contrast, when the terminal-mismatched DNA is added, no structural change occurs under the same conditions. Therefore, the single base pairing/unpairing at the outermost surface of the nanoparticle impacts the interparticle distance. This unique feature could be applied to the regulation of structures and properties of various DNA-functionalized nanoparticle assemblies.

Original languageEnglish
Pages (from-to)3153-3161
Number of pages9
JournalSmall
Volume11
Issue number26
DOIs
Publication statusPublished - Jul 1 2015
Externally publishedYes

Fingerprint

Base Pairing
Gold
Dimers
Nanoparticles
DNA
Modulation
Transmission Electron Microscopy
Metal Nanoparticles
Cryoelectron Microscopy
Magnesium Chloride
Transmission electron microscopy
Dynamic light scattering
Electrophoresis
Electron microscopy
Complementary DNA
Gels
Physical properties

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Engineering (miscellaneous)

Cite this

Modulation of Interparticle Distance in Discrete Gold Nanoparticle Dimers and Trimers by DNA Single-Base Pairing. / Akiyama, Yoshitsugu; Shikagawa, Hiroto; Kanayama, Naoki; Takarada, Tohru; Maeda, Mizuo.

In: Small, Vol. 11, No. 26, 01.07.2015, p. 3153-3161.

Research output: Contribution to journalArticle

Akiyama, Yoshitsugu ; Shikagawa, Hiroto ; Kanayama, Naoki ; Takarada, Tohru ; Maeda, Mizuo. / Modulation of Interparticle Distance in Discrete Gold Nanoparticle Dimers and Trimers by DNA Single-Base Pairing. In: Small. 2015 ; Vol. 11, No. 26. pp. 3153-3161.
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