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

Research output: Contribution to journalArticle

18 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 languageEnglish
Pages (from-to)1868-1874
Number of pages7
JournalPolyhedron
Volume28
Issue number9-10
DOIs
Publication statusPublished - 2009 Jun 22

Fingerprint

Azobenzene
magnetic effects
Ferromagnetism
Sulfhydryl Compounds
thiols
Gold
ferromagnetism
Particle size
gold
Nanoparticles
nanoparticles
Ligands
Diamagnetism
Photoisomerization
Free volume
ligands
diamagnetism
Magnetic properties
azobenzene
inversions

Keywords

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

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Materials Chemistry
  • Physical and Theoretical Chemistry

Cite this

Size-reduction induced ferromagnetism and photo-magnetic effects in azobenzene-thiol-passivated gold nanoparticles. / Suda, Masayuki; Kameyama, Naoto; Ikegami, Aya; Suzuki, Motohiro; Kawamura, Naomi; Einaga, Yasuaki.

In: Polyhedron, Vol. 28, No. 9-10, 22.06.2009, p. 1868-1874.

Research output: Contribution to journalArticle

Suda, Masayuki ; Kameyama, Naoto ; Ikegami, Aya ; Suzuki, Motohiro ; Kawamura, Naomi ; Einaga, Yasuaki. / Size-reduction induced ferromagnetism and photo-magnetic effects in azobenzene-thiol-passivated gold nanoparticles. In: Polyhedron. 2009 ; Vol. 28, No. 9-10. pp. 1868-1874.
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