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 journalArticlepeer-review

21 Citations (Scopus)


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
Issue number9-10
Publication statusPublished - 2009 Jun 22


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

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


Dive into the research topics of 'Size-reduction induced ferromagnetism and photo-magnetic effects in azobenzene-thiol-passivated gold nanoparticles'. Together they form a unique fingerprint.

Cite this