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Capped Bimetallic and Trimetallic Nanoparticles for Catalysis and Information Technology
Author(s) -
Toshima Naoki
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200851004
Subject(s) - bimetallic strip , nanoparticle , materials science , dopant , metal , catalysis , nanotechnology , chemical engineering , alloy , doping , coercivity , organic chemistry , chemistry , composite material , metallurgy , optoelectronics , engineering , condensed matter physics , physics
Summary: Polymer‐capped metal nanoparticles can be recognized as a kind of macromolecule‐metal nanoparticle complexes. Here the preparations of the capped bimetallic and trimetallic nanoparticles, in which each particle contains two and three elements of metal, respectively, are presented. They may have a random alloy, a core/shell, or other kinds of structure depending on the preparation method and the combination of elements. The core/shell structure is advantageous to electronically control the activity of metal catalysts. The triple core/shell structured trimetallic nanoparticles were found to have higher catalytic activity than the corresponding monometallic and bimetallic nanoparticles in three cases. Capped metal nanoparticles were also used as a dopant to liquid crystals. Liquid crystal displays, fabricated by metal nanoparticle‐doped liquid crystals, showed faster response than those without dopants. Bimetalization could increase the long‐term stability in the doped liquid crystal displays. Thus, metal nanoparticles can improve the electronic display system, which occupies an important position in information technology. In addition, SmCo 5 nanomagnets were successfully prepared by a chemical method, possibly providing a new building block for information technology. The prepared SmCo 5 nanoparticles have a coercivity of 1500 Oe at room temperature. The bimetallic nanoparticles may open a new field in super‐high‐density magnetic memories.