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Dr Roger Bennett
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Contact details
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Telephone
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+44 (0) 118 378 8559 |
Fax |
+44 (0) 118 975 0203 |
E-mail |
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Location |
J.J.Thomson Physical
Laboratory.
Department of Physics,
University of Reading,
Reading,
RG6 6AF,
UK |
Background
Dr. Roger Bennett is a founding member and first Honorary
Secretary and Treasurer of the
Nanoscale
Physics and Technology Group of the Institute
of Physics. He joined the department of Physics in 2000 and has established a
research group investigating ultra-thin film oxide growth, spatial
organisation and the control of the growth of nanostructures. He coordinates
much of the activity of the Reading NanoScience and Materials Theme and is
currently webmaster and Seminar organiser. He is a member of the
Diamond synchrotron
I07 beamline
user working group. In 2007 he rejoined the chemistry department at
Reading where he previously
worked developing high temperature scanning tunnelling
microscopy to provide a local probe of chemical reaction kinetics on the
nanoscale in a range of model heterogeneous
catalyst systems.
Research Activities
Transition Metal Oxide
Ultra-Thin Films
Transition metal oxides encompass a
wide range of technologically important materials ranging from gas sensors,
catalytic supports and catalysts through to gate dielectrics in the
semiconductor industry. In all of these roles the surface (or interfaces) of
the oxide dominate the activity.
The programme at Reading
aims to develop an understanding of the properties of the oxide surface, the
interface between oxides and metallic nanoparticles
and the role of surface defects and structures in growth mechanisms. Current
goals include determining why reducible transition metal oxides show a wide
range of electronic and structural properties that can be tuned by variation
of oxide composition; understanding the nucleation and growth of metallic
particles on oxides and the investigation of epitaxial
growth of 1-10nm thick ultra-thin oxide films on other materials. We make use
of advanced microscopy facilities and photoemission spectroscopy to
characterise the materials. In parallel we have recently begun to develop a
complementary modelling activity with collaborations locally and abroad. We
enjoy considerable beamtime at central facilities and are currently using
synchrotron radiation to provide structural data for adsorbates on oxides
and the structures adopted by epitaxial oxide ultra thin films.
Collaborations
Dr Georg Held, Reading
Dr Paul Mulheran, Strathclyde
Dr Mark Newton, ESRF, Grenoble
Dr Michael Nolan and Dr Simon Elliot, Tyndall National Institute, Cork
Dr Stephen Poulston, Johnson Matthey plc
Selected
Publications
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“Mechanisms and dynamics of protein clustering on a
solid surface” P.A. Mulheran, D. Pellenc, R.A. Bennett, R.J. Green, and M.
Sperrin, Physical Review Letters 100 (2008) 068102.
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“Electronic Structure of Point Defects in Controlled
self doping of the TiO2(110) surface: a
combined photoemission spectroscopy and density functional theory study”, M.
Nolan, S. Elliott, J.S. Mulley, M. Basham, R.A. Bennett and P.A. Mulheran,
Physical Review B 77 (2008) 235424.
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"Structure of Adsorbed Organometallic Rhodium: Model
Single Atom Catalysts"
R. A. Bennett, N. D. McCavish, M. Basham, V. R. Dhanak and M. A. Newton
Phys. Rev. Lett. 98, 056102 (2007).
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“Spectroscopy of ultra-thin epitaxial rutile TiO2(110)
films grown on W(100)”, R.A. Bennett, J.S. Mulley, M.A. Newton and M.
Surman, Journal of Chemical Physics 127 (2007) 084707
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“Non-stoichiometric
oxide surfaces and ultra-thin films: characterisation of TiO2”
R.A. Bennett and N.D. McCavish, Topics in Catalysis, 36 (2005), 11-19.
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“Ripening processes in supported and pinned
nanoclusters - experiment, simulation and theory”
R.A. Bennett, D.M. Tarr and P.A. Mulheran, Journal
of Physics: Condensed Matter 15 (2003) S3139-3152.
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“Ultra thin film growth of titanium dioxide On
W(100)” N.D. McCavish and R.A. Bennett, Surface Science 546 (2003) 47-56.
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“Catalysis at the metal-support interface:
exemplified by the photocatalytic reforming of
methanol on Pd/TiO2” M. Bowker, D.
James, P. Stone, R. Bennett, N. Perkins, L. Millard, J. Greaves and A.
Dickinson, Journal of Catalysis 217 (2003) 427-433.
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"Measurement of the surface growth kinetics of reduced
TiO2 during re-oxidation using time resolved Scanning Tunnelling
Microscopy”, R.D. Smith, R.A. Bennett and M.
Bowker, Physical Review B 66 (2002) 035409 -
1-7.
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“TiO2 surface structures for the directed
growth of metal nanoparticles via Metal and
MetalOrganic Chemical Vapour Deposition”, R.A.
Bennett, M.A. Newton, R.D. Smith, J. Evans and M. Bowker,
Materials Science and Technology 18 (2002) 710-715.
All publications
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