Size-reduction induced ferromagnetism and photo-magnetic effects in azobenzene-thiol-passivated gold nanoparticles

Masayuki Suda; Naoto Kameyama; Aya Ikegami; Motohiro Suzuki; Naomi Kawamura; Yasuaki Einaga

doi:10.1016/j.poly.2008.10.021

Size-reduction induced ferromagnetism and photo-magnetic effects in azobenzene-thiol-passivated gold nanoparticles

Masayuki Suda, Naoto Kameyama, Aya Ikegami, Motohiro Suzuki, Naomi Kawamura, Yasuaki Einaga

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

We have observed size-reduction induced ferromagnetism and significant photo-magnetic effects in azobezene-thiol-modified gold nanoparticles. When the particle size was reduced to 1.7 nm, ferromagnetism even at room temperature was observed while diamagnetism was dominating with the particle size of 5.0 nm. Furthermore, reducing the particles size to 1.7 nm also gave rise to photo-magnetic properties because the decrease in particle size provided free volume between each of the azobenzene ligands. This photo-magnetic effect could be attributed to photo-induced changes in the values of d-charge losses due to the photoisomerization of azo-ligands, which were accompanied by the inversion of surface dipole values to the opposite sign.

Original language	English
Pages (from-to)	1868-1874
Number of pages	7
Journal	Polyhedron
Volume	28
Issue number	9-10
DOIs	https://doi.org/10.1016/j.poly.2008.10.021
Publication status	Published - 2009 Jun 22

Keywords

Azo compounds
Ferromagnetism
Gold nanoparticles
Organic-inorganic interface
Photo-magnetic effects
Photochromism

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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title = "Size-reduction induced ferromagnetism and photo-magnetic effects in azobenzene-thiol-passivated gold nanoparticles",

abstract = "We have observed size-reduction induced ferromagnetism and significant photo-magnetic effects in azobezene-thiol-modified gold nanoparticles. When the particle size was reduced to 1.7 nm, ferromagnetism even at room temperature was observed while diamagnetism was dominating with the particle size of 5.0 nm. Furthermore, reducing the particles size to 1.7 nm also gave rise to photo-magnetic properties because the decrease in particle size provided free volume between each of the azobenzene ligands. This photo-magnetic effect could be attributed to photo-induced changes in the values of d-charge losses due to the photoisomerization of azo-ligands, which were accompanied by the inversion of surface dipole values to the opposite sign.",

keywords = "Azo compounds, Ferromagnetism, Gold nanoparticles, Organic-inorganic interface, Photo-magnetic effects, Photochromism",

author = "Masayuki Suda and Naoto Kameyama and Aya Ikegami and Motohiro Suzuki and Naomi Kawamura and Yasuaki Einaga",

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AU - Suda, Masayuki

AU - Kameyama, Naoto

AU - Ikegami, Aya

AU - Suzuki, Motohiro

AU - Kawamura, Naomi

AU - Einaga, Yasuaki

PY - 2009/6/22

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N2 - We have observed size-reduction induced ferromagnetism and significant photo-magnetic effects in azobezene-thiol-modified gold nanoparticles. When the particle size was reduced to 1.7 nm, ferromagnetism even at room temperature was observed while diamagnetism was dominating with the particle size of 5.0 nm. Furthermore, reducing the particles size to 1.7 nm also gave rise to photo-magnetic properties because the decrease in particle size provided free volume between each of the azobenzene ligands. This photo-magnetic effect could be attributed to photo-induced changes in the values of d-charge losses due to the photoisomerization of azo-ligands, which were accompanied by the inversion of surface dipole values to the opposite sign.

AB - We have observed size-reduction induced ferromagnetism and significant photo-magnetic effects in azobezene-thiol-modified gold nanoparticles. When the particle size was reduced to 1.7 nm, ferromagnetism even at room temperature was observed while diamagnetism was dominating with the particle size of 5.0 nm. Furthermore, reducing the particles size to 1.7 nm also gave rise to photo-magnetic properties because the decrease in particle size provided free volume between each of the azobenzene ligands. This photo-magnetic effect could be attributed to photo-induced changes in the values of d-charge losses due to the photoisomerization of azo-ligands, which were accompanied by the inversion of surface dipole values to the opposite sign.

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KW - Organic-inorganic interface

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