Palladium Nanoparticles Protected with Other Organic Species

Palladium nanoparticles stabilized by tetra-alkylam-monium salts are prepared by the electrochemical reduction of Pd complex in the presence of tetra-alky-lammonium surfactants.[84] Glycolate-stabilized Pd and Ni nanoparticles were synthesized by hydrogen reduction of Pd(NO3)2 in the presence of tetraoctylam-monium glycolates.[85] Monodisperse Pd nanoparticles with core dimensions of 3.5, 5, and 7nm were synthesized by the thermal decomposition of Pd-trioctylpho-sphine (TOP) complex in an argon atmosphere.[86] The core size of Pd nanoparticles was controlled by varying the concentration of TOP.

chemical recognition. Quantized double-layer charging has been one of the more interesting properties of alkanethiolate-protected metal nanoparticles. Optical properties of metal nanoparticles could be tuned by the incorporation of photoactive ligands. Optoelectronic properties of metal nanoparticles related to the surface plasmon absorption have also drawn increased interests. Catalytic properties of monolayer-protected metal nanoparticles are now being investigated in the broad field of catalysis including simple organic reactions, polymerization, and electrocatalysis. Functionalized monolayer-protected metal nanoparticles recognize molecules, bioconjugates, supramolecules, and metals based on various interactions (e.g., hydrogen-bonding, van der Waals, and electrostatic interactions). The combination of electronic and/or optical properties of metal nanoparticles with sensing capability results in the development of excellent sensory devices. The article on "Metal Nanoparticles Protected with Monolayers: Applications for Chemical Vapor Sensing and Gas Chromatography'' touches on some of these particular applications.

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