Physics 版 (精华区)
发信人: zjliu (秋天的萝卜), 信区: Physics
标 题: 磁性纳米晶粒和半导体量子点的三维二元超晶格
发信站: 哈工大紫丁香 (Sun Jun 29 10:14:27 2003)
Nature 423, 968 - 971 (26 June 2003); doi:10.1038/nature01702
Three-dimensional binary superlattices of magnetic nanocrystals and
semiconductor quantum dots
F. X. REDL*?, K.-S. CHO*?, C. B. MURRAY* & S. O'BRIEN?
* IBM, T. J. Watson Research Center, Nanoscale Materials and Devices, 1101
Kitchawan Road, Route 134, Yorktown Heights, New York 10598, USA
? Department of Applied Physics & Applied Mathematics, Columbia University,
200 SW Mudd Building, 500 West 120th Street, New York, New York 10027, USA
? Advanced Materials Research Institute (AMRI), University of New Orleans,
New Orleans, Louisiana, 70148, USA
Correspondence and requests for materials should be addressed to C.B.M.
(cbmurray@us.ibm.com).
标 题: 磁性纳米晶粒和半导体量子点的三维二元超晶格
发信站: 瀚海星云 (2003年06月26日09:55:24 星期四), 站内信件
Nature 423, 968 - 971 (26 June 2003); doi:10.1038/nature01702
Three-dimensional binary superlattices of magnetic nanocrystals and
semiconductor quantum dots
F. X. REDL*?, K.-S. CHO*?, C. B. MURRAY* & S. O'BRIEN?
* IBM, T. J. Watson Research Center, Nanoscale Materials and Devices, 1101
Kitchawan Road, Route 134, Yorktown Heights, New York 10598, USA
? Department of Applied Physics & Applied Mathematics, Columbia University,
200 SW Mudd Building, 500 West 120th Street, New York, New York 10027, USA
? Advanced Materials Research Institute (AMRI), University of New Orleans,
New Orleans, Louisiana, 70148, USA
Correspondence and requests for materials should be addressed to C.B.M.
(cbmurray@us.ibm.com).
Recent advances in strategies for synthesizing nanoparticles—such as
semiconductor quantum dots, magnets and noble-metal clusters—have enabled
the precise control of composition, size, shape, crystal structure, and
surface chemistry. The distinct properties of the resulting nanometre-scale
building blocks can be harnessed in assemblies with new collective
properties, which can be further engineered by controlling interparticle
spacing and by material processing. Our study is motivated by the emerging
concept of metamaterials—materials with properties arising from the
controlled interaction of the different nanocrystals in an assembly.
Previous multi-component nanocrystal assemblies have usually resulted in
amorphous or short-range-ordered materials because of non-directional
forces or insufficient mobility during assembly. Here we report the
self-assembly of PbSe semiconductor quantum dots and Fe2O3 magnetic
nanocrystals into precisely ordered three-dimensional superlattices. The
use of specific size ratios directs the assembly of the magnetic and
semiconducting nanoparticles into AB13 or AB2 superlattices with
potentially tunable optical and magnetic properties. This synthesis concept
could ultimately enable the fine-tuning of material responses to magnetic,
Recent advances in strategies for synthesizing nanoparticles—such as
semiconductor quantum dots, magnets and noble-metal clusters—have enabled
the precise control of composition, size, shape, crystal structure, and
surface chemistry. The distinct properties of the resulting nanometre-scale
building blocks can be harnessed in assemblies with new collective
properties, which can be further engineered by controlling interparticle
spacing and by material processing. Our study is motivated by the emerging
concept of metamaterials—materials with properties arising from the
controlled interaction of the different nanocrystals in an assembly.
Previous multi-component nanocrystal assemblies have usually resulted in
amorphous or short-range-ordered materials because of non-directional
forces or insufficient mobility during assembly. Here we report the
self-assembly of PbSe semiconductor quantum dots and Fe2O3 magnetic
nanocrystals into precisely ordered three-dimensional superlattices. The
use of specific size ratios directs the assembly of the magnetic and
semiconducting nanoparticles into AB13 or AB2 superlattices with
potentially tunable optical and magnetic properties. This synthesis concept
could ultimately enable the fine-tuning of material responses to magnetic,
electrical, optical and mechanical stimuli.
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