Thermodynamic properties of Pt nanoparticles: Size, shape, support, and adsorbate effects
نویسندگان
چکیده
B. Roldan Cuenya,1,* M. Alcántara Ortigoza,1,† L. K. Ono,1 F. Behafarid,1 S. Mostafa,1 J. R. Croy,1 K. Paredis,1 G. Shafai,1 T. S. Rahman,1 L. Li,2 Z. Zhang,2 and J. C. Yang3 1Department of Physics, PS 430, University of Central Florida, P.O. Box 162385, 4000 Central Florida Boulevard, Orlando, Florida 32816, USA 2Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA 3Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA (Received 16 October 2011; revised manuscript received 16 November 2011; published 20 December 2011)
منابع مشابه
Electronic properties and charge transfer phenomena in Pt nanoparticles on γ-Al2O3: size, shape, support, and adsorbate effects.
This study presents a systematic detailed experimental and theoretical investigation of the electronic properties of size-controlled free and γ-Al(2)O(3)-supported Pt nanoparticles (NPs) and their evolution with decreasing NP size and adsorbate (H(2)) coverage. A combination of in situ X-ray absorption near-edge structure (XANES) and density functional theory (DFT) calculations revealed changes...
متن کاملAnomalous lattice dynamics and thermal properties of supported size- and shape-selected Pt nanoparticles
Anomalous lattice dynamics and thermal behavior have been observed for ligand-free, size-, and shapeselected Pt nanoparticles NPs supported on nanocrystalline -Al2O3 via extended x-ray absorption finestructure spectroscopy. Several major differences were observed for the NPs with respect to bulk Pt: i a contraction in the interatomic distances, ii a reduction in the dynamic temperature-dependen...
متن کاملShape, Thermodynamics, Kinetics and Growth Mechanisms of Metal and Bimetallic Nanoparticles
Shape, Thermodynamics, Kinetics and Growth Mechanisms of Metal and Bimetallic Nanoparticles Lingxuan Peng Metal and bimetallic nanoparticles are of interest and are widely used in various applications because of their unique optical, electronic, and catalytic properties, which differ from those of their bulk counterparts. Better understanding of the thermodynamic and kinetic properties of nanop...
متن کاملGreen Approach to Synthesis of Pt and Bimetallic Au@Pt Nanoparticles Using Carica Papaya Leaf Extract and Their Characterization
This study reports a green approach to synthesis of monometallic platinum nanoparticles (Pt NPs) and bimetallic aurium@platinum nanoparticles (Au@Pt) using aqueous leaf extract of Carica papaya as a reducing and stabilizing agent. The nature and morphology of as-synthesized PtNPs and bimetallic Au@Pt NPs were characterized using UV/vis spectroscopy (UV–vis), high resolution transmission electro...
متن کاملSolving the structure of size-selected Pt nanocatalysts synthesized by inverse micelle encapsulation.
The structure, size, and shape of gamma-Al(2)O(3)-supported Pt nanoparticles (NPs) synthesized by inverse micelle encapsulation have been resolved via a synergistic combination of imaging and spectroscopic tools. It is shown that this synthesis method leads to 3D NP shapes even for subnanometer clusters, in contrast to the raft-like structures obtained for the same systems via traditional depos...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011