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Mesoscopic structures of nanocrystals: Collective magnetic properties due to the alignment of nanocrystals

被引：56
作者：
Lalatonne, Y
Motte, L
Russier, V
Ngo, AT
Bonville, P
Pileni, MP
机构：
[1] Univ Paris 06, UMR 7070, Lab Mat Mesoscop & Nanomet, F-75005 Paris, France
[2] DRECAM SPEC, Commissariat Energie Atom, Ctr Edutes Saclay, F-91191 Gif Sur Yvette, France
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 06期
关键词：
D O I：
10.1021/jp035665c
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Maghemite nanocrystals, deposited by slow evaporation on HOPG (highly oriented pyrolytic graphite) substrate, form mesoscopic structures which strongly depend on the nanocrystal coating. When the coating consists of citrate ions and octanoic acid, tubelike structures are formed when the deposition process takes place under an applied magnetic field. Conversely, dense films are formed when the nanocrystals are coated with propanoic acid and dodecanoic acid. The magnetic behaviors markedly differ with the organization of nanocrystals and are attributed to the change in the anisotropy of the organized structures. Nanocrystals organized in tubes behave as nanowires.
引用
收藏
页码：1848 / 1854
页数：7
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