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 | |
| Publication status | Published - 2009 Jun 22 |
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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 journal › Article
}
TY - JOUR
T1 - Size-reduction induced ferromagnetism and photo-magnetic effects in azobenzene-thiol-passivated gold nanoparticles
AU - Suda, Masayuki
AU - Kameyama, Naoto
AU - Ikegami, Aya
AU - Suzuki, Motohiro
AU - Kawamura, Naomi
AU - Einaga, Yasuaki
PY - 2009/6/22
Y1 - 2009/6/22
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.
KW - Azo compounds
KW - Ferromagnetism
KW - Gold nanoparticles
KW - Organic-inorganic interface
KW - Photo-magnetic effects
KW - Photochromism
UR - http://www.scopus.com/inward/record.url?scp=67349162436&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67349162436&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2008.10.021
DO - 10.1016/j.poly.2008.10.021
M3 - Article
VL - 28
SP - 1868
EP - 1874
JO - Polyhedron
JF - Polyhedron
SN - 0277-5387
IS - 9-10
ER -