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Ionic Bonding between Artificial Atoms
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DOI：10.1021/jp509603p.png)
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Conventional solids are prepared from building blocks that are conceptually no larger than a hundred atoms. While van der Waals and dipole-dipole interactions also influence the formation of these materials, stronger interactions, referred to as chemical bonds, play a more decisive role in determining the structures of most solids. Chemical bonds that hold such materials together are said to be ionic, covalent, metallic, dative, or otherwise a combination of these. Solids that utilize semiconductor nanocrystal quantum dots as building units have been demonstrated to exist; however, the interparticle forces in such materials are decidedly not chemical. Here we demonstrate the formation of charge transfer states in a binary quantum dot mixture. Charge is observed to reside in quantum confined states of one of the participating quantum dots. These interactions lead to materials that may be regarded as the nanoscale analog of an ionic solid. The process by which these materials form has interesting parallels to chemical reactions in conventional chemistry.
Keyword:
BINARY NANOPARTICLE SUPERLATTICES
SEMICONDUCTOR NANOCRYSTALS
II-VI
FILMS
AGGREGATION
DYNAMICS
CLUSTERS
C60
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IF:
3.2
论文数:
5.6W
被引数:
15.0W
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