Sequential Growth of Magic英文文献资料.pdf

N O I T A C DOI: 10.1002/adma.200601015 I N U Sequential Growth of Magic-Size CdSe Nanocrystals** M M O By Stefan Kudera, Marco Zanella, Cinzia Giannini, Aurora Rizzo, Yanqin Li, Giuseppe Gigli, C Roberto Cingolani, Giuseppe Ciccarella, Werner Spahl, Wolfgang J. Parak, and Liberato Manna* Colloidal semiconductor nanocrystals have been exploited containing a well-defined number of atoms, and therefore, in several applications in which they serve as fluorophores, be- characterized by particularly stable structures; thus, these cause of the tunability of the wavelength of the emitted structures can also be termed “magic-size clusters” (MSCs). light.[1–3] The possibility of exactly controlling the size of Different families of almost monodisperse CdS clusters of nanocrystals is of great importance in the development of sizes down to 1.3 nm were reported by Vossmeyer et al.,[10] these materials, as this will lead to nano-objects with well-de- whereas CdSe MSCs were observed later in the solution fined and reproducible properties. Whereas this goal seems to growth of colloidal nanocrystals[11] and the various cluster be hard to achieve with large nanocrystals, it might be viable sizes found were explained as arising from the aggregation of for clusters consisting of a few tens or hundreds of atoms, as smaller clusters. Soloviev et al. synthesized and crystallized a in this size regime a handful of structures can have an excep- homologous series of CdSe cluster molecules[12,13] (very simi- tionally high stability and therefore would form preferentially lar in structure to those reporte