Title

In Situ Gas-Phase Catalytic Properties Of Tic-Supported Size-Selected Gold Nanoparticles Synthesized By Diblock Copolymer Encapsulation

Keywords

Atomic force microscopy (AFM); Carbon monoxide; Catalysis; Diblock copolymer; Gold nanoparticle; Oxygen; Surface structure, morphology, roughness, and topography; Thermal desorption spectroscopy; Titanium carbide; Transmission electron microscopy (TEM); X-ray photoelectron spectroscopy (XPS)

Abstract

TiC-supported size- and shape-selected Au nanoparticles with well defined interparticle distances were synthesized by diblock copolymer encapsulation. Atomic force microscopy (AFM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD) have been used to investigate the correlation between the nanocatalyst morphological/electronic structure and its chemical reactivity. Using the low-temperature oxidation of CO as a model reaction, our TPD results showed an enhancement of the catalytic activity with decreasing particle size. Two desorption features were observed and assigned to kinks/steps in the gold surface and the Au-TiC interface. The role of the interparticle distance on the activity is discussed. AFM measurements showed drastic morphological changes (Ostwald ripening) on the nanoparticles after CO oxidation when the initial interparticle distance was small (∼30 nm). However, no sintering was observed for Au nanoparticles more widely spaced (∼80 nm). © 2006 Elsevier B.V. All rights reserved.

Publication Date

12-1-2006

Publication Title

Surface Science

Volume

600

Issue

23

Number of Pages

5041-5050

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.susc.2006.08.025

Socpus ID

33751401514 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33751401514

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