Evaluation of the inter-particle distance of gold nanoparticles dispersed on silane-treated substrates to fabricate dithiol-connected arrays

Tomoki Yagai, Kazuhiko Matsumoto, Makoto Moribayashi, Masataka Moriya, Hiroshi Shimada, Ayumi Hirano-Iwata, Fumihiko Hirose, Yoshinao Mizugaki

Research output: Contribution to journalArticlepeer-review

Abstract

Small tunnel junctions using gold nanoparticles (GNPs) as electrodes have been studied to fabricate single-electron devices. GNPs connected via dithiol molecules have been used as small tunnel junctions, and a two-stage dispersion method was used to fabricate dithiol-connected GNP arrays. In this process, the GNPs were fixed on silane-treated substrates by immersing the substrate in a colloidal gold solution. For fabricating dithiol-connected arrays, the inter-particle distance of the dispersed GNPs must be smaller than the GNP diameter. Consequently, the inter-particle distance controlled by the immersion time (T IM1) was evaluated. For T IM1 values exceeding 8 h, the inter-particle distance was less than the GNP diameter. A second dispersion of GNPs after treating samples with dithiol realized particle connections. For the GNP arrays produced with T IM1 values greater than 8 h, the I-V characteristics were measured at 77 K, and the yield of devices exhibiting nonlinear I-V curves was 23%.

Original languageEnglish
Article numberSDDF09
JournalJapanese journal of applied physics
Volume58
Issue numberSD
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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