Now showing items 1-6 of 6

    • Carbon nanotube diameter selection by pretreatment of metal catalysts on surfaces 

      Hauge, Robert H.; Xu, Ya-Qiong; Shan, Hongwei; Nicholas, Nolan Walker; Kim, Myung Jong; Schmidt, Howard K.; Kittrell, Carter W. (2012-02-28)
      A new and useful nanotube growth substrate conditioning processes is herein disclosed that allows the growth of vertical arrays of carbon nanotubes where the average diameter of the nanotubes can be selected and/or controlled ...
    • Controlled multi-step purification of single-walled carbon nanotubes 

      Xu, Ya-Qiong (2005)
      A controlled and scalable multi-step purification method has been developed to remove iron impurity and non-nanotube carbon materials from raw single-walled carbon nanotubes produced in the HiPco (high pressure CO) process. ...
    • Multi-step purification of single-wall carbon nanotubes 

      Hauge, Robert H.; Xu, Ya-Qiong; Peng, Haiqing; Smalley, Richard E.; Marek, Irene Morin (2010-03-02)
      The present invention relates to processes for the purification of single-wall carbon nanotubes (SWNTs). Known methods of single-wall carbon nanotube production result in a single-wall carbon nanotube product that contains ...
    • Production of single-walled carbon nanotube grids 

      Hauge, Robert H.; Xu, Ya-Qiong; Pheasant, Sean (2013-12-03)
      A method of forming a nanotube grid includes placing a plurality of catalyst nanoparticles on a grid framework, contacting the catalyst nanoparticles with a gas mixture that includes hydrogen and a carbon source in a ...
    • Production of vertical arrays of small diameter single-walled carbon nanotubes 

      Hauge, Robert H.; Xu, Ya-Qiong (2013-08-13)
      A hot filament chemical vapor deposition method has been developed to grow at least one vertical single-walled carbon nanotube (SWNT). In general, various embodiments of the present invention disclose novel processes for ...
    • Study of purification and growth of single-walled carbon nanotubes 

      Xu, Ya-Qiong (2006)
      Single-walled carbon nanotubes (SWNTs) have been intensively studied because of their many potential applications. However, all known processes for formation of SWNTs involve transition-metal catalysts, residues of which ...