Interviewed by Carwyn Jones on the BBC

DFT calculated Au10 cluster

DFT calculated Au10 cluster

The importance of gold catalysis including a small part about gold on carbon relating to our hydrochlorination project has been highlighted by Carwyn on BBC local news:

http://www.bbc.co.uk/news/uk-wales-28297198

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Functional groups at carbon surfaces

AFM of HCl treated HOPG before and after heating in air.

AFM of HCl treated HOPG before and after heating in air.

Our latest paper on the nature and role of functional groups on highly ordered pyrolytic graphite (HOPG) surfaces in the stabilisation of gold nanoparticles has been accepted for publication in Faraday Discussion 173. The uncorrected proofs are available here. We have used selective functionalisation and XPS to identify the functional groups produced on the HOPG by acids and study how these are affected by heating. HCl produce primarily OH(a) which when heated convert to a mixture of ketone and ether type oxygens. We show the effect of these oxygen states on gold deposited on the surface from solution. The figure shown here is an AFM of the effect of heating on the functionalised HOPG surface.

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Matt & Tom present their posters at the CUROP exhibition

The CUROP projects end with a poster exhibition in the VJ gallery.  Lots of interest in both the model carbon catalyst work by Tom and the model iron molybdate catalyst work by Matt. These students were waiting for their lecture but thought the whole CUROP project idea was a good one.

Earth science students admiring Matt & Tom's posters.

Earth science students admiring Matt & Tom’s posters.
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Phil presenting at the UK&I photocatalysis meeting in Dublin

Meeting held at the FOCAS Institute, Dublin Institute of Technology (DIT). See Phil’s presentation at Prezi

Phil presenting lecture at Dublin photocat meeting

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The remarkable effect of gold!

Enhancing surface reactivity with a noble metal

Chem. Commun., 2013, Advance Article
DOI: 10.1039/C3CC43567A
In a recently published paper in the RSC chemical communications we show that a monolayer of gold has a remarkable activating effect on the reaction of HCl with a Cu(100) surface. Whereas the clean copper surface shows a rapid decrease in activity towards HCl as the chlorine coverage approaches the limit of the θ = 0.5 expected for a c(2×2) structure, the presence of gold on the surface, far from blocking surface sites as one would expect, enables concentrations of chlorine of in excess of θ = 2/3.  We suggest that by alloying with the copper surface the gold provides a low energy pathway to disrupting the surface monolayer.
Supported by EPSRC grant: EP/I038748/1
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A facile route to core shell model catalysts

A facile route to model catalysts: the synthesis of Au@Pd core–shell nanoparticles on γ-Fe2O3 (0001)

Robert J. Davies,*   Michael Bowker, Philip R. Daviesand   David J. Morgan
Nanoscale, 2013, Advance Article
DOI: 10.1039/C3NR03047D

Our latest paper is now available on line in the RSC Nanoscale journal. The paper describes a straightforward method of synthesising Au@Pd core–shell particles on a well characterised γ-Fe2O3 (0001) substrate by metal vapour deposition under ultra high vacuum. The resulting particles are probed by LEIS and STM and should provide an ideal route by which the chemistry of theses systems can be explored under ideal conditions.

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STEM presentation

Armada-Group-Learning_and_DevelopmentPresentation by Phil to the able and talented from Clevedon School; discussing nanoscience, catalysis and hydrochlorination reactions. See the final presentation here.

 

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