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The University of Southampton

Surface chemistry and conduction in nano-composite thin films Seminar

Charlie Cummings
20 February 2013
Building 27, Room 2001 Chemistry Highfield University of Southampton SO17 1BJ

For more information regarding this seminar, please email Dr Andrew Hector at .

Event details

Part of the Electrochemistry Seminar Series

Work reported in this presentation is on the preparation and investigation of nano-composite films. Materials prepared on the nanoscale have vastly different properties to that of the bulk. Of particular interest is conduction processes that are important as they have a direct comnsequnce of the chemistry investigated such as splitting water or molecular electronics.
Two nano-composite materials were evaluated, iron oxide and Ru-dimer coated TiO2 nanoparticles. In both cases the surface species of the nanoparticles can be investigated using electrochemical techniques.

For -Fe2O3 nanoparticles the surface states of Fe include the intrinsic Fe(III) as well as Fe(II) and what isa higher oxidation states of Fe. This higher oxidation state of iron is studied for the catalytic oxidation of glucose and water. Using spectro-electrochemical techniques such as potential modulated absorption spectroscopy and light modulated adsorption spectroscopy a spectra of the higher oxidation was recorded.

TiO2 nanoparticles were coated with a Ru-dimer. At the potentials explored the ruthenium oxidises from the Ru(II) state to the Ru(III). Diffusion coefficients were recorded for the movement of charges through the structure using two different techniques and a value of 1 x 10-15 m2 s-1 was recorded.

Speaker information

Dr Charlie Cummings,He studied chemistry at the University of Bath including a year in industry with Cognis UK Lt. based in Hythe. His final year project involved studying electrochemical processes at nanoparticle interfaces and after graduating with a First class degree, he decided to undertake his PhD at the same institution. The thesis title is “electrodeposition and characterisation of semiconductor materials “which included themes of electrochemistry, photo-electrochemistry and material science. He graduated in 2012 before joining the chemistry department at the University of Southampton. He is a member of the SCFED Project ( which looks at growing nanomaterial devices by electrodeposition from supercritical media. His academic interests include electrochemistry, photo-electrochemistry and material science. He feels very welcome at Southampton and is thoroughly enjoying working in the department of chemistry. Outside of work he enjoys sports, hard rock music and playing the guitar.

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