Title

Thermal Fingerprint Of Silica Encapsulated Phase Change Nanoparticles

Abstract

The diffusion of hydrogen atoms across solid oxide surfaces is often assumed to be accelerated by the presence of water molecules. Here we present a high-resolution, high-speed scanning tunneling microscopy (STM) study of the diffusion of H atoms on an FeO thin film. STM movies directly reveal a water-mediated hydrogen diffusion mechanism on the oxide surface at temperatures between 100 and 300 kelvin. Density functional theory calculations and isotope-exchange experiments confirm the STM observations, and a proton-transfer mechanism that proceeds via an H3O+-like transition state is revealed. This mechanism differs from that observed previously for rutile TiO2(110), where water dissociation is a key step in proton diffusion.

Publication Date

5-21-2012

Publication Title

Nanoscale

Volume

4

Issue

6083

Number of Pages

3237-3241

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1039/c2nr30092c

Socpus ID

84860712909 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84860712909

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