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2015 | OriginalPaper | Buchkapitel

Atom-Precise Metal Nanoclusters

verfasst von : Anu George, Sukhendu Mandal

Erschienen in: Applied Spectroscopy and the Science of Nanomaterials

Verlag: Springer Singapore

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Abstract

A nanocrystal is a crystallite with size greater than about 2 nm. Nanoclusters are non-crystalline nanoparticles that are typically small and composed of a specific number of metal atoms in the core, which are protected by a shell of ligands. Optical properties of large metal nanoparticles in external electromagnetic fields are a function of their size, free-electron density and dielectric function relative that of the surrounding medium. The ultra-small size of nanoclusters allows them to exhibit distinct quantum confinement effects, which in turn results in their discrete electronic structure and molecular-like properties, such as HOMO-LUMO electronic transitions, enhanced photoluminescence, and intrinsic magnetism, to name a few of the characteristics. Metal nanoclusters play an important bridging role between nanochemistry and molecular chemistry. A basic understanding of the structure, electronic and optical properties, as the materials evolve from the atomic state to nanoclusters to fcc-structured nanocrystals, constitutes a major evolution across length scales, and leads to fundamental insights into the correlation between the structure and key characteristics of metal nanoclusters.

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Titel: Atom-Precise Metal Nanoclusters
verfasst von: Anu George
Sukhendu Mandal
Verlag: Springer Singapore
Buch: Applied Spectroscopy and the Science of Nanomaterials
Print ISBN: 978-981-287-241-8

Electronic ISBN: 978-981-287-242-5

Copyright-Jahr: 2015
DOI: https://doi.org/10.1007/978-981-287-242-5_7

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