Title

Nanoepitaxy Using Micellar Nanoparticles

Keywords

Au; epitaxy; Nanoparticle; Pt; shape; STM

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 (∼1000 °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 clearly deviates from that of conventional bulklike Wulff structures. © 2011 American Chemical Society.

Publication Date

12-14-2011

Publication Title

Nano Letters

Volume

11

Issue

12

Number of Pages

5290-5296

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/nl2027525

Socpus ID

83655192475 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/83655192475

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