Dr. Gunnar Westin
Department of Chemistry - Ångström, Uppsala University,
Uppsala, Sweden Abstract: Solution based processes have gained much interest for
the preparation of complex nano-structured materials. Benefits are found in the
often direct and simple processing routes allowing for large scale technological
exploitation of the processes without the use of complex and size and shape
limiting vacuum equipment needed for physical and chemical vapor deposition.
The solution chemical routes span a wide range of sub-disciplines that have
been rapidly developed during the recent decade to produce very unique and high
quality materials of various shapes and complexities. In this seminar solution
based routes to complex nano-structured materials in different forms
representing different kinds of complex structuring and areas of uses will be
presented, as well as some of their applications in renewable energy,
electronics and, cutting and mining tools. Some topics covered are: (i) Solution processing with heterometallic alkoxide
precursors allowing for very low synthesis temperatures, doping levels beyond
the thermodynamic limits, ultra thin complex composition coatings etc. (ii) Extended
Er-doping range in silica wave-guides for Near IR amplifiers by use of single Er-ion
heterometallic alkoxides (iii) Thin and ultra thin electroceramic films (iv) Complex
structure and composition large band-gap semi-conductors, including mixed
phase, core-shell and wire structures (v) Films and sponges of nano-structured
metals and alloys, and (vi) Metal-in-ceramic nano-composite films and foams.
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