Diameter-selective separation of double-walled carbon nanotubes

Jin Hee Kim, Masakazu Kataoka, Yoong Ahm Kim, Daisuke Shimamoto, Hiroyuki Muramatsu, Takuya Hayashi, Morinobu Endo, Mauricio Terrones, Mildred S. Dresselhaus
2008 Applied Physics Letters  
Here, we report a simple and effective way of separating double-walled carbon nanotubes as a function of their diameter using individually dispersed nanotube solutions with the aid of long and random single-stranded DNA. The subtle pH change in nanotube solutions gives rise to the preferential coagulation of large-diameter tubes and allows the easy preparation of small-diameter tubes. The stronger van der Waals forces between large-diameter tubes, combined with the decreased solubility of DNA
more » ... solubility of DNA in water at low pH, lead to the preferential agglomeration of large-diameter tubes.
doi:10.1063/1.3039790 fatcat:epo5lwg3fvgp3fc5shxljmqj4u