TY - JOUR
T1 - Low-Temperature Magnetism of Gold Nano Particles Contained in Electrochemical Sugar Recognition System
AU - Goto, T.
AU - Kitamoto, Y.
AU - Matsui, K.
AU - Kuroe, H.
AU - Endo, A.
AU - Hashimoto, T.
AU - Hayashita, T.
AU - Iguchi, S.
AU - Sasaki, T.
N1 - Publisher Copyright:
© 1965-2012 IEEE.
PY - 2019/2
Y1 - 2019/2
N2 - 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.
AB - 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.
KW - Gold nano particles (GNPs)
KW - nuclear magnetic resonance (NMR)
KW - paramagnetism
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U2 - 10.1109/TMAG.2018.2872134
DO - 10.1109/TMAG.2018.2872134
M3 - Article
AN - SCOPUS:85058174540
SN - 0018-9464
VL - 55
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 2
M1 - 8568991
ER -