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Cyanosol thin films and their application in nanoalloy synthesis.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Cyanosol thin films and their application in nanoalloy synthesis.
Author:	Zhu, Shu.
Description:	134 p.
Notes:	Adviser: Andrew Bocarsly.
Notes:	Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4573.
Contained By:	Dissertation Abstracts International64-09B.
Subject:	Engineering, Materials Science.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3102238
ISBN:	0496498088

Cyanosol thin films and their application in nanoalloy synthesis.
Zhu, Shu.

Cyanosol thin films and their application in nanoalloy synthesis. [electronic resource] - 134 p.

Adviser: Andrew Bocarsly.

Thesis (Ph.D.)--Princeton University, 2003.

Cyanogels are inorganic coordination polymers with metal centers interconnected by bridging cyano groups. Previously, the physical and chemical properties of bulk cyanogels were examined. Their applications as precursors to a series of materials were also explored. The current study is both an extension and an expansion of those studies. First, the sol-gel processing of bulk cyanogels is extended to the preparation of Pt/Co, Pt/Pd, Pt/Ru alloys, the composition control of Pd/Co alloy, and the syntheses of composite materials including sulfides and zeolite/cyanogel hybrids. Second and more importantly, a major part of the study concentrates on cyanosol thin films. It is found that a Pd/Co cyanosol thin film is composed of mono-dispersed spherical particles of 3nm in diameter. They form both clusters and super lattices. The bonding property of a Pd/Co cyanogel thin film is distinct from its bulk counterpart as 'all-bridging-cyanide' state is observed in the thin film. The difference is explained with reference to the formation mechanism of cyanogels, whose discloser is facilitated by the reaction quenching capability of the spin coating technique. Qualitatively, cyanogels formation is proposed to take place through a two-step mechanism: the formation of uniform sized nanometer scale sol particles and their coalescence to bigger gel particles. As for the Pd/Co cyanogel, the first step is quantitatively characterized to be a first order process. Various cyanosol thin films are processed by sol-gel technique, which yielded nanometer sized bi-metallic alloy particles. It is shown that the size and distribution of the alloy particles can be controlled by manipulating polymerization and spin coating conditions. This is the first case of using sol-gel technique for nanoalloy preparation and also by far the most convenient method for this purpose.

ISBN: 0496498088Subjects--Topical Terms:

226940
Engineering, Materials Science.

Cyanosol thin films and their application in nanoalloy synthesis.
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520 # $a Cyanogels are inorganic coordination polymers with metal centers interconnected by bridging cyano groups. Previously, the physical and chemical properties of bulk cyanogels were examined. Their applications as precursors to a series of materials were also explored. The current study is both an extension and an expansion of those studies. First, the sol-gel processing of bulk cyanogels is extended to the preparation of Pt/Co, Pt/Pd, Pt/Ru alloys, the composition control of Pd/Co alloy, and the syntheses of composite materials including sulfides and zeolite/cyanogel hybrids. Second and more importantly, a major part of the study concentrates on cyanosol thin films. It is found that a Pd/Co cyanosol thin film is composed of mono-dispersed spherical particles of 3nm in diameter. They form both clusters and super lattices. The bonding property of a Pd/Co cyanogel thin film is distinct from its bulk counterpart as 'all-bridging-cyanide' state is observed in the thin film. The difference is explained with reference to the formation mechanism of cyanogels, whose discloser is facilitated by the reaction quenching capability of the spin coating technique. Qualitatively, cyanogels formation is proposed to take place through a two-step mechanism: the formation of uniform sized nanometer scale sol particles and their coalescence to bigger gel particles. As for the Pd/Co cyanogel, the first step is quantitatively characterized to be a first order process. Various cyanosol thin films are processed by sol-gel technique, which yielded nanometer sized bi-metallic alloy particles. It is shown that the size and distribution of the alloy particles can be controlled by manipulating polymerization and spin coating conditions. This is the first case of using sol-gel technique for nanoalloy preparation and also by far the most convenient method for this purpose.
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