期刊
SCIENCE
卷 327, 期 5971, 页码 1355-1359出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1177218
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资金
- Air Force Office of Scientific Research [FA9550-06-1-0337]
- Fannie and John Hertz Foundation
- Ministry of Education, Science and Technology [R33-2008-000-10021-0]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-06CH11357]
- Argonne National Laboratory
- NSF [DMR-9871177, DMR-0320740]
- J. S. McDonnell Foundation for the development of BUBBA
- Marie Curie Actions [MOIF-CT-2006-039636]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0932823] Funding Source: National Science Foundation
- Ministry of Education, Science & Technology (MoST), Republic of Korea [R33-2008-000-10021-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The collective properties of nanoparticles manifest in their ability to self-organize into complex microscale structures. Slow oxidation of tellurium ions in cadmium telluride (CdTe) nanoparticles results in the assembly of 1- to 4-micrometer-long flat ribbons made of several layers of individual cadmium sulfide (CdS)/CdTe nanocrystals. Twisting of the ribbons with an equal distribution of left and right helices was induced by illumination with visible light. The pitch lengths (250 to 1500 nanometers) varied with illumination dose, and the twisting was associated with the relief of mechanical shear stress in assembled ribbons caused by photooxidation of CdS. Unusual shapes of multiparticle assemblies, such as ellipsoidal clouds, dog-bone agglomerates, and ribbon bunches, were observed as intermediate stages. Computer simulations revealed that the balance between attraction and electrostatic repulsion determines the resulting geometry and dimensionality of the nanoparticle assemblies.
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