Submitted on: 14 June 2002.
Revised on: 19 August 2002.
Accepted on: 15 October 2002.
___________________Beilstein Journal of Nanotechnology
Submitted on: 23 April 2014.
Revised on: 05 June 2014.
Accepted on: 21 July 2014.
___________________Beilstein Journal of Nanotechnology
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Submitted on: 22 March 2013.
Revised on: 01 May 2013.
Accepted on: 18 June 2013.
___________________Beilstein Journal of Nanotechnology
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