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Design of novel multi-functional materials based on isopolyanions

Final Activity Report Summary - ISOPOLYANIONS (Design of Novel Multi-functional Materials based on Isopolyanions)

Solid state redox active materials, which can be oxidised and reduced, have received little interest over recent years. This is somewhat surprising given the key roles they play in a wide variety of devices, in particular ranging within the field of sensor technology. These solid materials are able to conduct an electric current, due to them possessing two types of conductivities, namely, electronic and ionic. For the successful development of materials, it is vital that several unanswered key research questions be addressed these include:
- Can pure and stable redox active solid state materials be attained?
- Can they be successfully deposited onto a variety of surfaces so as to attain stable systems?
- Can the redox and surface properties of the materials when surface immobilised be probed.
- What are the redox and surface properties of these systems?
- What are the applications of these systems?

This research proposal was concerned with the development of a novel type of redox active material based upon a family of compounds, polyoxometallates. The main findings of this work have been the following:
- A range of redox active polyoxometallate systems were synthesised and fully characterised by modern electrochemical and spectroscopic techniques.
- The technique of nanoassembly was applied so as to surface immobilise these POMs in an ordered fashion onto a variety of electrode surfaces (i.e. carbon and indium tin oxide).
- The redox activity and the surface properties of these surface immobilised systems has been investigated successfully.
- The possible employment of these nanoassemblies in sensor technology has been explored with the assemblies showing interaction with nitrite and iodate in solution.