Submitted on: 22 February 2013.
Revised on: 20 June 2013.
Accepted on: 20 July 2013.
___________________ACS Nano---AMER CHEMICAL SOC
Submitted on: 26 April 2013.
Revised on: 20 August 2013.
Accepted on: 08 September 2013.
___________________ACS Nano---AMER CHEMICAL SOC
http://reply.papertrans.cn/1/3/223/223-33.png
http://reply.papertrans.cn/1/3/223/223-34.png
Submitted on: 14 February 2009.
Revised on: 04 April 2009.
Accepted on: 23 April 2009.
___________________ACS Nano---AMER CHEMICAL SOC
http://reply.papertrans.cn/1/3/223/223-36.png