Submitted on: 22 January 1998.
Revised on: 21 April 1998.
Accepted on: 18 June 1998.
___________________ACS Nano---AMER CHEMICAL SOC
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Submitted on: 12 February 1999.
Revised on: 26 April 1999.
Accepted on: 03 June 1999.
___________________ACS Nano---AMER CHEMICAL SOC
Submitted on: 26 July 2007.
Revised on: 20 September 2007.
Accepted on: 27 October 2007.
___________________ACS Nano---AMER CHEMICAL SOC
Submitted on: 09 October 2004.
Revised on: 29 November 2004.
Accepted on: 25 December 2004.
___________________ACS Nano---AMER CHEMICAL SOC
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Submitted on: 09 February 2012.
Revised on: 04 May 2012.
Accepted on: 29 June 2012.
___________________ACS Nano---AMER CHEMICAL SOC