Submitted on: 15 December 2007.
Revised on: 14 February 2008.
Accepted on: 23 March 2008.
___________________ACS Materials Letters---AMER CHEMICAL SOC
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Submitted on: 01 March 2006.
Revised on: 25 June 2006.
Accepted on: 15 August 2006.
___________________ACS Materials Letters---AMER CHEMICAL SOC
Submitted on: 19 March 2012.
Revised on: 16 May 2012.
Accepted on: 27 June 2012.
___________________ACS Materials Letters---AMER CHEMICAL SOC