Laterally enhanced growth of electrodeposited Au to form ultrathin films on nonconductive surfaces

Chiaki Kobayashi, Mikiko Saito, Takayuki Homma

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4 Citations (Scopus)

Abstract

We investigated the laterally enhanced growth of electrodeposited Au for fabricating nanogap electrodes. To enhance the lateral growth, we carried out electrodeposition over patterned electrodes onto a SiO 2 surface modified with self-assembled monolayers (SAMs) or dendrimers with amine groups. The morphology and thickness of the Au films were controlled by adjusting deposition conditions such as duration, applied potential, and Au ion concentration in the bath. To investigate the mechanism of the laterally enhanced growth, the surface states of SAM- or dendrimer-modified SiO 2 were analyzed by X-ray photoelectron spectroscopy (XPS). The XPS results indicate the existence of organic molecules and Au ions on the SiO 2 surface, which suggests that laterally enhanced growth is induced by the Au ions coordinated on the amine groups of the organic molecules. To further analyze the mechanism of the laterally enhanced growth, we investigated the relationship between the morphology of the laterally enhanced growth of Au and the amount of Au ions on organic molecules. The laterally enhanced growth of Au is expected to be useful for fabricating thin film nanogap electrodes.

Original languageEnglish
Pages (from-to)235-243
Number of pages9
JournalElectrochimica Acta
Volume74
DOIs
Publication statusPublished - 2012 Jul 15

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Keywords

  • Electrodeposition
  • Lateral growth
  • Nanogap electrodes
  • Self-assembled monolayers

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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