Title

Nanoepitaxy Using Micellar Nanoparticles

Authors

Authors

F. Behafarid;B. R. Cuenya

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Nano Lett.

Keywords

Nanoparticle; shape; STM; epitaxy; Pt; Au; METAL-SUPPORT INTERACTIONS; SCANNING-TUNNELING-MICROSCOPY; PLATINUM; NANOPARTICLES; THERMAL-STABILITY; CATALYTIC-PROPERTIES; TIO2(110); SURFACE; EPITAXIAL STRESS; MODEL CATALYSTS; SHAPE CHANGES; FILMS; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &; Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter

Abstract

The shape of platinum and gold nanoparticles (NPs) synthesized via inverse micelle encapsulation and supported on TiO(2)(110) has been resolved by scanning tunneling microscopy. Annealing these systems at high temperature (similar to 1000 degrees C) and subsequent cooling to room temperature produced ordered arrays of well-separated three-dimensional faceted NPs in their equilibrium state. The observed shapes differ from the kinetically limited shapes of conventional physical vapor deposited NPs, which normally form two-dimensional flat islands upon annealing at elevated temperatures. The initial NP volume was found to provide a means to control the final NP shape. Despite the liquid-phase ex situ synthesis of the micellar particles, the in situ removal of the encapsulating ligands and subsequent annealing consistently lead to the development of a well-defined epitaxial relationship of the metal NPs with the oxide support. The observed epitaxial relationships could be explained in terms of the best overlap between the interfacial Pt (or Au) and TiO(2) lattices. In most cases, the ratio of {100}/{111} facets obtained for the NP shapes resolved dearly deviates from that of conventional bulklike Wulff structures.

Journal Title

Nano Letters

Volume

11

Issue/Number

12

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

5290

Last Page

5296

WOS Identifier

WOS:000297950200032

ISSN

1530-6984

Share

COinS