Accession Number : ADA626886


Title :   Investigation of Chirality Selection Mechanism of Single-Walled Carbon Nanotube


Descriptive Note : Final rept. 1 Jun 2014-31 May 2015


Corporate Author : KOREA INST OF SCIENCE AND TECHNOLOGY JEONBUK


Personal Author(s) : Kim, Seung M


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a626886.pdf


Report Date : 17 Jul 2015


Pagination or Media Count : 19


Abstract : This project involved investigation of two significant mechanistic aspects of carbon nanotube (CNT) array growth under chemical vapor deposition conditions: chirality selectivity and termination. The research involved development of a proper Transmission Electron Microscopy (TEM) sample preparation method that allowed direct observation of interfaces between CNTs and catalyst layers and lead to optimized growth conditions for synthesis of short, less dense, and highly crystalline single-walled carbon nanotubes. Based on ex-situ and in-situ TEM investigation, a modified growth termination model was proposed to better explain various phenomena of carbon nanotube growth and growth termination. The results strongly suggest that growth termination of CNT forests is affected by the morphological evolution of catalyst particles.


Descriptors :   *CARBON NANOTUBES , CATALYSIS , CHEMICAL VAPOR DEPOSITION , CRYSTAL GROWTH , EXPERIMENTAL DESIGN , MORPHOLOGY , PROCESSING


Subject Categories : Physical Chemistry
      Refractory Fibers
      Crystallography


Distribution Statement : APPROVED FOR PUBLIC RELEASE