Fabrication and Characterization of Floating Memory Devices Based on Thiolate-Protected Gold Nanoclusters

Naoyuki Hirata, Minako Sato, Eika Tsunemi, Yoshio Watanabe, Hironori Tsunoyama, Masato Nakaya, Toyoaki Eguchi, Yuichi Negishi, Atsushi Nakajima

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The floating memory properties of thiolate-protected gold (Au:SR) nanoclusters, Au25(SR)18, Au38(SR)24, Au144(SR)60, and Au333(SR)79 (R = C12H25), and Au colloids were investigated using four-probe measurements in vacuum. Uniform and monolayer films of Au:SR nanoclusters or Au colloids were formed as floating memory layers on p-type Si substrates by Langmuir-Blodgett method. The fluoropolymer (CYTOP, ∼15 nm thick) was spin-coated on top to form a hydrophobic insulating layer. Using Au dot (∼40 nm thick) as the anode electrode, the capacitance-voltage (C-V) measurements were performed using the Au and Cu plate electrodes as contact points for the two probes. Clockwise hysteresis curves originating from the Au:SR nanoclusters or Au colloids were observed, and the hysteresis width was dependent on the size of the Au:SR nanoclusters and the sample temperature. In particular, for the Au38(SR)24 nanocluster, multiple phases were observed in the C-V curve, implying their application in multivalued memory devices.

Original languageEnglish
Pages (from-to)10638-10644
Number of pages7
JournalJournal of Physical Chemistry C
Volume121
Issue number20
DOIs
Publication statusPublished - 2017 May 25

Fingerprint

Nanoclusters
nanoclusters
Gold
floating
gold
Data storage equipment
Colloids
Fabrication
fabrication
colloids
Hysteresis
capacitance
hysteresis
fluoropolymers
Fluorine containing polymers
Electrodes
Capacitance measurement
electrodes
probes
Voltage measurement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

Cite this

Fabrication and Characterization of Floating Memory Devices Based on Thiolate-Protected Gold Nanoclusters. / Hirata, Naoyuki; Sato, Minako; Tsunemi, Eika; Watanabe, Yoshio; Tsunoyama, Hironori; Nakaya, Masato; Eguchi, Toyoaki; Negishi, Yuichi; Nakajima, Atsushi.

In: Journal of Physical Chemistry C, Vol. 121, No. 20, 25.05.2017, p. 10638-10644.

Research output: Contribution to journalArticle

Hirata, Naoyuki ; Sato, Minako ; Tsunemi, Eika ; Watanabe, Yoshio ; Tsunoyama, Hironori ; Nakaya, Masato ; Eguchi, Toyoaki ; Negishi, Yuichi ; Nakajima, Atsushi. / Fabrication and Characterization of Floating Memory Devices Based on Thiolate-Protected Gold Nanoclusters. In: Journal of Physical Chemistry C. 2017 ; Vol. 121, No. 20. pp. 10638-10644.
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