A Morphology‐Selective Copper Organosol

Abstract

Hexagonal colloidal copper particles with a narrow size distribution are formed in the reduction of an acetonitrile solution of Cu(OAc)2·H2O with hydrazine hydrate in the presence of poly(vinyl‐2‐pyrrolidone). The deep‐red sols, which were characterized by electron microscopy, are extremely stable in an inert gas atmosphere. They can be redispersed even after complete drying. An insoluble red film is however formed when the dried sol is heated for 30 minutes; this process probably involves polymer cross‐linking.

Dendrimer-Encapsulated Metal Nanoparticles: Synthesis, Characterization, and Applications to Catalysis

“…37 The absence of an absorption peak arising from Mie plasmon resonance (around 570 nm) indicates that the Cu clusters are smaller than about 4 nm. 38,39 The presence of metal clusters is also supported by loss of signal in the EPR spectrum following reduction of the dendrimer/Cu 2+ composite.…”

Shape-controlled preparation and catalytic activity of metal nanoparticles for hydrogenation of 2-butyne-1,4-diol and styrene oxide

“…Controlling the shapes of Au particles as plate like trigons has been explained on the basis of Kossel-Stramki theory of face selective growth of crystals [17][18][19]. Formation of colloidal Cu particles having plate like hexagonal morphology has also been studied [20]. The morphology of Pt nanoparticles was studied using UV-spectrophotometry and TEM and a parameter S was determined to evaluate the particle shape and the degree of dispersion [21].…”

Use of Dendrimers during the Synthesis of Pt-Ru Electrocatalysts for PEM Fuel Cells: Effects on the Physical and Electrochemical Properties

“…Changes in solution colour and UV-visible absorbance bands are the evidences for this cluster formation [20] even giving some clue about their size [21,22]. In the case of dendrimers with noncomplexing functional groups, such as hydroxyl groups, nanoparticle formation is carried out into the dendrimer [23,24].…”