Low-Temperature Magnetism of Gold Nano Particles Contained in Electrochemical Sugar Recognition System

T. Goto, Y. Kitamoto, K. Matsui, H. Kuroe, A. Endo, T. Hashimoto, T. Hayashita, S. Iguchi, Toshio Sasaki

Research output: Contribution to journalArticle

Abstract

Low-Temperature magnetic properties were investigated on the gold nano particles (GNPs) with an average size of 11.5 nm, assembled with molecules of ruthenium complex (Ru0), and phenylboronic acid (B0) by the proton nuclear magnetic resonance (1H-NMR) and susceptibility measurements. The temperature dependence of the NMR shift and the uniform susceptibility was described as the sum of the Curie-Weiss term and a positive constant term. From the former, the average number of Ru0 on each GNP was estimated to be 118, which is 23% of the calculation. The finite positive constant term shows a clear contrast with the well-known fact that the bulk gold is diamagnetic. Finally, a disappearance of the motional narrowing effect in the proton NMR spectra below 60 K indicates that the wavering motion of Ru0 complexes on GNP at room temperature is frozen at low temperatures.

Original languageEnglish
Article number8568991
JournalIEEE Transactions on Magnetics
Volume55
Issue number2
DOIs
Publication statusPublished - 2019 Feb 1
Externally publishedYes

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Keywords

  • Gold nano particles (GNPs)
  • nuclear magnetic resonance (NMR)
  • paramagnetism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Goto, T., Kitamoto, Y., Matsui, K., Kuroe, H., Endo, A., Hashimoto, T., Hayashita, T., Iguchi, S., & Sasaki, T. (2019). Low-Temperature Magnetism of Gold Nano Particles Contained in Electrochemical Sugar Recognition System. IEEE Transactions on Magnetics, 55(2), [8568991]. https://doi.org/10.1109/TMAG.2018.2872134