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Coverage-Dependent Structural Evolution in the Interaction of NO2 with Au{111}

Zhang, T, Sacchi, M, King, DA and Driver, SM (2012) Coverage-Dependent Structural Evolution in the Interaction of NO2 with Au{111} Journal of Physical Chemistry C, 116 (9). pp. 5637-5645.

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Abstract

We have used low-temperature STM, together with DFT calculations incorporating the effects of dispersion forces, to study from a structural point of view the interaction of NO2 with Au{111} surfaces. NO2 adsorbs molecularly on Au{111} at 80 K, initially as small, disordered clusters at the elbows of the type-x reconstruction lines of the clean-surface herringbone reconstruction, and then as larger, ordered islands on the fcc regions. Within the islands, the NO2 molecules define a (√3 × 2)rect. superlattice, for which we evaluate structural models. By around 0.25 ML coverage, the herringbone reconstruction has been lifted, accompanied by the formation of Au nanoclusters, and the islands have coalesced. At this stage, essentially the whole surface is covered with an overlayer consisting predominantly of domains of the (√3 × 2)rect. structure, but also containing less well-ordered regions. With further exposure, the degree of disorder in the overlayer increases; saturation occurs close to 0.43 ML.

Item Type: Article
Subjects : Chemistry
Authors :
NameEmailORCID
Zhang, TUNSPECIFIEDUNSPECIFIED
Sacchi, Mm.sacchi@surrey.ac.ukUNSPECIFIED
King, DAUNSPECIFIEDUNSPECIFIED
Driver, SMUNSPECIFIEDUNSPECIFIED
Date : 5 February 2012
Funders : Engineering and Physical Sciences Research Council (EPSRC)
Identification Number : https://doi.org/10.1021/jp2097586
Copyright Disclaimer : © 2012 American Chemical Society
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:56
Last Modified : 18 May 2017 12:53
URI: http://epubs.surrey.ac.uk/id/eprint/840859

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