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Synthesis, Characterization of Monodisperse Platinum Nanoparticles
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The Synthesis, Characterization and Catalytic Reaction Studies of Monodisperse Platinum Nanoparticles in Mesoporous Oxide Materials Creator/Author: Rioux, Robert M. Publication Date: 2006 Jan 15 Resource Type:Thesis/Dissertation Research Org:Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US) Abstract: A catalyst design program was implemented in which Pt nanoparticles, either of monodisperse size and/or shape were synthesized, characterized and studied in a number of hydrocarbon conversion reactions. The novel preparation of these materials enables exquisite control over their physical and chemical properties that could be controlled (and therefore rationally tuned) during synthesis. The ability to synthesize rather than prepare catalysts followed by thorough characterization enable accurate structure-functionrelationships to be elucidated. Pt nanoparticles (1.7-7.1 nm) are synthesized by solution phase reduction methods in which Pt precursors are reduced in protic solvents in the presence of a surface templating polymer, which serves to stabilize the metal nanoparticles in solution. Particle size can be controlled during synthesis by altering either the PVP: Pt salt ratio, reaction media and by seeded growth methods. After Pt nanoparticles are synthesized, their size and morphology are confirmed with transmission electron microscopy and x-ray diffraction. Low power sonication in either aqueous or.... http://www.osti.gov/bridge/servlets/purl/895528-CYJJ3H/ |
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wangzi212楼
2007-07-10 18:24
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