Gold nanoparticle assemblies stabilized by bis(phthalocyaninato) lanthanide(III) complexes through van der Waals interactions

Yuki Noda, Shin Ichiro Noro, Tomoyuki Akutagawa, Takayoshi Nakamura

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Gold nanoparticle assemblies possess diverse application potential, ranging from industrial nanotechnology to medical biotechnology. Because the structures and properties of assemblies are directly affected by the stabilization mechanism between the organic molecules serving as protecting ligands and the gold nanoparticle surface, it is crucial to find and investigate new stabilization mechanisms. Here, we report that π-conjugated phthalocyanine rings can serve as stabilizing ligands for gold nanoparticles. Bis(phthalocyaninato)lutetium(III) (LuPc 2) or bis(phthalocyaninato)terbium(III) (TbPc 2), even though complex, do not have specific binding units and stabilize gold nanoparticles through van der Waals interaction between parallel adsorbed phthalocyanine ligands and the gold nanoparticle surface. AC magnetic measurements and the electron-transport properties of the assemblies give direct evidence that the phthalocyanines are isolated from each other. Each nanoparticle shows weak electronic coupling despite the short internanoparticle distance (∼1â€...nm), suggesting Efros-Shklovskii-type variable-range hopping and collective single-electron tunnelling behaviours.

Original languageEnglish
Article number3758
JournalScientific reports
Volume4
DOIs
Publication statusPublished - 2014 Jan 20

ASJC Scopus subject areas

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