Conductive gold nanoparticle mirrors at liquid/liquid interfaces

Ping Ping Fang, Shu Chen, Haiqiang Deng, Micheál D. Scanlon, Frédéric Gumy, Hye Jin Lee, Dmitry Momotenko, Véronique Amstutz, Fernando Cortés-Salazar, Carlos M. Pereira, Zhilin Yang, Hubert H. Girault

Research output: Contribution to journalArticlepeer-review

128 Scopus citations

Abstract

Gold nanoparticle (Au NP) mirrors, which exhibit both high reflectance and electrical conductance, were self-assembled at a [heptane + 1,2-dichloroethane]/ water liquid/liquid interface. The highest reflectance, as observed experimentally and confirmed by finite difference time domain calculations, occurred for Au NP films consisting of 60 nm diameter NPs and approximate monolayer surface coverage. Scanning electrochemical microscopy approach curves over the interfacial metallic NP films revealed a transition from an insulating to a conducting electrical material on reaching a surface coverage at least equivalent to the formation of a single monolayer. Reflectance and conductance transitions were interpreted as critical junctures corresponding to a surface coverage that exceeded the percolation threshold of the Au NP films at the [heptane + 1,2-dichloroethane]/water interface.

Original languageEnglish
Pages (from-to)9241-9248
Number of pages8
JournalACS Nano
Volume7
Issue number10
DOIs
StatePublished - 22 Oct 2013

Keywords

  • Au nanoparticle mirror
  • conductance
  • liquid/liquid interface
  • reflectance
  • scanning electrochemical microscopy
  • surface plasmon resonance

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