Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/43684
DC FieldValueLanguage
dc.contributor.authorWang, S.R.en_US
dc.contributor.author曾文甲zh_TW
dc.contributor.authorTseng, W.J.en_US
dc.date2009zh_TW
dc.date.accessioned2014-06-06T08:11:21Z-
dc.date.available2014-06-06T08:11:21Z-
dc.identifier.issn1388-0764zh_TW
dc.identifier.urihttp://hdl.handle.net/11455/43684-
dc.description.abstractMonodispersed platinum (Pt) nanoparticles were synthesized from reducing hydrated hydrogen hexachloroplatinic acid (H(2)PtCl(6)center dot nH(2)O) with ethanol in the presence of polyvinylpyrrolidone (PVP) as a steric stabilizer. Concentration of both PVP and ethanol influenced the aggregate structure and crystallite size of the nanoparticles. When the molar ratio of monomeric unit of PVP to Pt, i.e., [PVP]/[Pt], was one, the synthesized Pt particles coagulated pronouncedly into an inter-connected particulate network or self-organized into spherical superstructures with an apparent diameter ranging from 60 to 80 nm, depending on the ethanol concentration. The geometry and structure of these complex aggregates were characterized by fractal analysis. Fractal dimensions of 2.13-2.23 in three dimensions were determined from the Richardson's plot, which suggests that a reaction-limited cluster-cluster aggregation model (RCLA) was operative. The Pt colloids became apparently more stable when the [PVP]/[Pt] ratio was increased greater than 20. Crystallite size of the Pt nanoparticles was found to increase linearly with the ethanol concentration as the [PVP]/[Pt] was held at one. This suggests that the reduction rate of PtCl(6) (2-) ions in solution is critically important to the synthesized crystallite size.en_US
dc.language.isoen_USzh_TW
dc.relationJournal of Nanoparticle Researchen_US
dc.relation.ispartofseriesJournal of Nanoparticle Research, Volume 11, Issue 4, Page(s) 947-953.en_US
dc.relation.urihttp://dx.doi.org/10.1007/s11051-008-9482-0en_US
dc.subjectPt nanoparticlesen_US
dc.subjectAggregationen_US
dc.subjectFractalen_US
dc.subjectSynthesisen_US
dc.subjectfuel-cellen_US
dc.subjectpolymeren_US
dc.subjectnanocrystalsen_US
dc.subjectcatalysisen_US
dc.titleAggregate structure and crystallite size of platinum nanoparticles synthesized by ethanol reductionen_US
dc.typeJournal Articlezh_TW
dc.identifier.doi10.1007/s11051-008-9482-0zh_TW
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