Synthesis of length-controlled aerosol carbon nanotubes and their dispersion stability in aqueous solution

Young Kyun Moon, Jaebeom Lee, Jae Keun Lee, Tae Kyu Kim, Soo H. Kim

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

A one-step method combining spray Pyrolysis and thermal chemical vapor deposition (CVD) processes was developed to grow hybrid carbon nanotube (CNT)-bimetallic composite particles. Nickel, aluminum, and acetylene were used as the catalytic site, noncatalytic matrix, and hydrocarbon source, respectively. The bimetallic particles (i.e., Al-Ni) were spray pyrolized and subsequently passed through thermal CVD. During the thermal CVD, the catalytic decomposition of acetylene occurred on the free-floating bimetallic particles so that sea urchin-like CNTs were radially grown. Scanning electron microscopy (SEM) and transmission electron microscopy (TΈM) analyses revealed the CNTs to have a uniform diameter of ̃10 ± 2 nm. The length of the CNTs was controlled by varying the residence time of the bimetallic nanoparticles with a length of 200-1000 nm. After nitric acid treatment, the CNTs were released by melting the bimetallic particles. The resulting CNTs were then dispersed in an aqueous solution to examine the effect of the length of CNTs on their dispersion stability, which is a critical issue for the stability and repeatability of the heat transfer performance in nanofluids. Ultraviolet-visible (UV-vis) spectrometer analysis showed that shorter CNTs were less stable than the longer CNTs due to the higher mobility-induced agglomeration of the shorter CNTs.

Original languageEnglish
Pages (from-to)1739-1743
Number of pages5
JournalLangmuir
Volume25
Issue number3
DOIs
Publication statusPublished - 2009 Feb 3

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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