Submitted on: 23 September 2011.
Revised on: 19 November 2011.
Accepted on: 19 December 2011.
___________________ACS Nano---AMER CHEMICAL SOC
Submitted on: 26 November 2002.
Revised on: 10 March 2003.
Accepted on: 19 April 2003.
___________________ACS Nano---AMER CHEMICAL SOC
Submitted on: 23 September 2007.
Revised on: 06 January 2008.
Accepted on: 04 March 2008.
___________________ACS Nano---AMER CHEMICAL SOC
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Submitted on: 04 December 2001.
Revised on: 15 February 2002.
Accepted on: 16 March 2002.
___________________ACS Nano---AMER CHEMICAL SOC
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