In-flight kinetic measurements of the aerosol growth of carbon nanotubes by electrical mobility classification

The Journal of Physical Chemistry. B
S H Kim, M R Zachariah

Abstract

We describe an on-the-fly kinetic study of gas-phase growth of multiwalled carbon nanotubes. The methodology employs electrical mobility classification of the CNT, which enables a direct measure of CNT length distribution in an aerosol reactor. The specific experiment employs two mobility classification steps. In the first step we mobility classify the catalyst particle, in this case Ni, created by pulsed laser ablation, to generate a stream of monodisperse particles. This then determined the diameter of the CNT, when a hydrocarbon/H2 mix is added in a heated aerosol reactor. A second electrical mobility classification step allows us to determine the length distribution of the CNTs. We found that CNT growth from ethylene required the addition of small amounts of water vapor, whereas growth from acetylene did not. We show that acetylene, which always has small amounts of acetone present when purchased, can provide the oxygen source to prevent catalyst coking. By varying the temperature of the growth, we were able to extract Arrhenius growth parameters. We found an activation energy for growth approximately 80 kJ mol(-1) from both acetylene and ethylene, which is considerably lower than previous works for substrate-grown CNTs (E(...Continue Reading

References

May 31, 2003·Environmental Science & Technology·Kelly J HigginsMichael R Zachariah
Jan 30, 2004·Nature·Stig HelvegJens K Nørskov
Dec 4, 2004·Journal of Colloid and Interface Science·S H KimM R Zachariah

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Citations

Oct 29, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Mingdong LiMichael R Zachariah
Jun 24, 2008·Inhalation Toxicology·Jeong Hee HanIl Je Yu
Oct 30, 2009·Journal of Offender Rehabilitation·Lorie Smith Goshin, Mary Woods Byrne
May 16, 2017·Beilstein Journal of Nanotechnology·Marianna V Kharlamova
Jan 10, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Young Kyun MoonSoo H Kim

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