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Catalytic Properties of Pt Cluster-Decorated CeO2 Nanostructures

Nano Research 2011年第1期4卷 61-71页

作者： Lin Feng Dat Tien Hoang Chia-Kuang Tsung Wenyu Huang sylvia hsiao-yun lo Jennifer B. Wood Hungta Wang dinyao Tang Peidong Yang Department of Chemistry University of California Berkeley California 94720 USA Department of Chemistry Tsinghua University Beijing 100084 China Department of Chemistry Merkert Chemistry Center Boston College 2609 Beacon Street Chestnut Hill Massachusetts 02467 USA

Uniform clusters of Pt have been deposited on the surface of capping-agent-free CeO2 nanooctahedra and nanorods using electron beam （e-beam） evaporation. The coverage of the Pt nanocluster layer can be controlled by adjusting the e-beam evaporation time. The resulting e-beam evaporated Pt nanocluster layers on the CeO2 surfaces have a clean surface and clean interface between Pt and CeO2. Different growth behaviors of Pt on the two types of CeO2 nanocrystals were observed, with epitaxial growth of Pt on CeO2 nanooctahedra and random growth of Pt on CeO2 nanorods. The structures of the Pt clusters on the two different types of CeO2 nanocrystals have been studied and compared by using them as catalysts for model reactions. The results of hydrogenation reactions clearly showed the clean and similar chemical surface of the Pt clusters in both catalysts. The support- dependent activity of these catalysts was demonstrated by CO oxidation. The Pt/CeO2 nanorods showed much higher activity compared with Pt/CeO2 nanooctahedra because of the higher concentration of oxygen vacancies in the CeO2 nanorods. The structure-dependent selectivity of dehydrogenation reactions indicates that the structures of the Pt on CeO2 nanorods and nanooctahedra are different. Thes differences arise because the metal deposition behaviors are modulated by the strong metal-metal oxide interactions.

关键词： Nanocrystals nanoclusters interface catalysis

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Alumina-coated Ag nanocrystal monolayers as surfaceenhanced Raman spectroscopy platforms for the direct spectroscopic detection of water splitting reaction intermediates

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Nano Research 2014年第1期7卷 132-143页

作者： Xing Yi Ling Ruoxue Yan sylvia lo Dat Tien Hoang Chong Liu Melissa A. Fardy Sher Bahadar Khan Abdullah M. Asiri Salem M. Bawaked Peidong Yang Department of Chemistry University of California Berkeley CA 94720-1460 USA Center of Excellence for Advanced Materials Research (CEAMR) King Abdulaziz University Jeddah 21589 P.O. Box 80203 Saudi Arabia Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore Department of Chemical and Environmental Engineering. University of California Riverside CA 9252 1 USA These authors contributed equally to this work.

A novel Ag-alumina hybrid surface-enhanced Raman spectroscopy （SERS） platform has been designed for the spectroscopic detection of surface reactions in the steady state. Single crystalline and faceted silver （Ag） nanoparticles with strong light scattering were prepared in large quantity, which enables their reproducible self-assembly into large scale monolayers of Raman sensor arrays by the Langrnuir-Blodgett technique. The close packed sensor film contains high density of sub-nm gaps between sharp edges of Ag nanoparticles, which created large local electromagnetic fields that serve as ＂hot spots＂ for SERS enhancement. The SERS substrate was then coated with a thin layer of alumina by atomic layer deposition to prevent charge transfer between Ag and the reaction system. The photocatalytic water splitting reaction on a monolayer of anatase TiO2 nanoplates decorated with Pt co-catalyst nanoparticles was employed as a model reaction system. Reaction intermediates of water photooxidation were observed at the TiO2/solution interface under UV irradiation. The surface-enhanced Raman vibrations corresponding to peroxo, hydroperoxo and hydroxo surface intermediate species were observed on the TiO2 surface, suggesting that the photo-oxidation of water on these anatase TiO2 nanosheets may be initiated by a nucleophilic attack mechanism.

关键词： surface-enhanced Ramanspectroscopy water splitting reaction reaction intermediates Ag nanocrystals

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