Staff Profile:Dr Roger Bennett
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- Associate Professor in Nanostructured Surfaces
Dr Bennett's current research interests involve the investigation of the surface chemistry of transition metals, metal oxides and low dimensional structures such as thin films and nanosized dots. These materials are prepared and probed in ultra-high vacuum by many techniques both in house and at synchrotron facilities. For example, in an EPSRC funded project for Next Generation Facility Users he has examined the role of quantum well states in the bonding of nanothin metal films to zinc oxide surfaces to improve solar efficient window glass. In collaboration with Held and Jenkins (at Cambridge) he made the first quantitative structural study of a chirally terminated hcp crystal surface, Re(112bar1) which was published open access with cover art (http://centaur.reading.ac.uk/35330/). He also has an interest in spatial organisation and pattern formation by self assembly. Most recently he has been employing molecularspray deposition of large organic molecules and polymers (synthesised by Colquhoun and Hayes) to investigate functional material surfaces and interfaces.
Molecularspray deposition of novel macrocycle (synthesised by the Colquhoun group) leads to self assembly on the Au(111) surface in ultra-high vacuum. Collaborative work is ongoing (with Grau-Crespo) to relate the STM images to structural models.
Scanning tunnelling microscopy image of clean gold surface. The abrupt colour change on the right is due to an increase in height from low (dark) to high (bright) of a single layer of atoms of just less than 3 angstroms. The wavy structure is due to the surface reconstruction of the gold which puts too many gold atoms in the top layer and the surface rumples up!
Molecularspray deposition on the clean gold surface leads to the growth of rafts of molecules in different orientations on the surface. This work was performed as part of a final year undergraduate research project and involved commissioning the new apparatus.
Up close and personal with an ordered arrangement of large organic molecules deposited by molecularspray onto a clean gold surface in ultra-high vacuum. This work was performed as part of a final year undergraduate research project and involved commissioning the new apparatus.