Book ChapterDOI
Large clusters and colloids. Metals in the embryonic state
TLDR
In this paper, the size dependent quantization properties of transition metal clusters and colloids are investigated. But the size effects become more evident the smaller the particle is, whereas particles > 2 nm behave like quantum dots only at low temperatures, the 1.4 nm Au55 cluster follows quantum mechanical rules even at room temperature.Abstract:
Ligand stabilized transition metal clusters and colloids in the size range of 1–15 nm show size dependent quantization phenomena. Quantum size effects become the more evident the smaller the particle is. Whereas particles >2 nm behave like quantum dots only at low temperatures, the 1.4 nm Au55 cluster follows quantum mechanical rules even at room temperature. First steps to organize clusters and colloids three- (3D), two- (2D) and one- (1D) dimensionally have been performed. 3D arrays are reached by using spacer molecules to link the clusters and to enlarge the distances between them. 2D assemblies are realized in cluster and colloid monolayers on chemically modified surfaces. One-dimensional cluster wires become available by using nanoporous aluminum oxide membranes as templates.read more
Citations
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Journal ArticleDOI
Gold nanoparticles: assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology.
TL;DR: A review of gold nanoparticles can be found in this article, where the most stable metal nanoparticles, called gold colloids (AuNPs), have been used for catalysis and biology applications.
Journal ArticleDOI
Shape‐Controlled Synthesis of Metal Nanocrystals: Simple Chemistry Meets Complex Physics?
TL;DR: A comprehensive review of current research activities that center on the shape-controlled synthesis of metal nanocrystals, including a brief introduction to nucleation and growth within the context of metal Nanocrystal synthesis, followed by a discussion of the possible shapes that aMetal nanocrystal might take under different conditions.
Journal ArticleDOI
Synthesis and Characterization of Monodisperse Nanocrystals and Close-Packed Nanocrystal Assemblies
TL;DR: In this article, solution phase syntheses and size-selective separation methods to prepare semiconductor and metal nanocrystals, tunable in size from ∼1 to 20 nm and monodisperse to ≤ 5%, are presented.
Journal ArticleDOI
Nanoparticles as Recyclable Catalysts: The Frontier between Homogeneous and Heterogeneous Catalysis
TL;DR: The Review presents the recent developments and the use of NP catalysis in organic synthesis, for example, in hydrogenation and C--C coupling reactions, and the heterogeneous oxidation of CO on gold NPs.
Journal ArticleDOI
Gold nanoparticles in delivery applications
TL;DR: Gold nanoparticles provide non-toxic carriers for drug and gene delivery applications and their interaction with thiols is an effective and selective means of controlled intracellular release.
References
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Journal ArticleDOI
Electronic Properties of Metallic Fine Particles. I.
TL;DR: The level spacing of quantized electronic states becomes fairly large in very fine particles as mentioned in this paper, and the thermal properties may show considerable deviations from the normal bulk values for such fine particles.
Journal ArticleDOI
Au55[P(C6H5)3]12CI6 — ein Goldcluster ungewöhnlicher Größe
Günter Schmid,Reinhard Pfeil,Roland Boese,Friedhelm Bandermann,Sonja Meyer,Gijs. H. M. Calis,Jan W. A. van der Velden +6 more
TL;DR: In this article, einfaches Modell, beruhend auf einer Anordnung dichtest gepackter Goldatome, fuhrt zu einem Goldcluster, dessen Aufbau mit der ungewohnlichen chemischen Zusammensetzung in guter Ubereinstimmung ist.
Book
From theory to applications
TL;DR: Monumental as discussed by the authors is a compilation of the present engineering state of the art of microwave remote sensing, presented as a survey of the state-of-the-art in the field.