Growth of carbon nanotubes inside porous anodic alumina membranes: Simulation and experiment : научное издание | Научно-инновационный портал СФУ

Growth of carbon nanotubes inside porous anodic alumina membranes: Simulation and experiment : научное издание

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.1016/j.ijheatmasstransfer.2021.121414

Ключевые слова: carbon nanotubes, Chemical vapour deposition, ethanol pyrolysis, mathematical modelling, porous anodic alumina

Аннотация: Porous anodic alumina (PAA) membranes represent a widely used and extensively studied template for production of carbon nanotubes (CNT). The PAA–CNT membranes possess a number of unique properties, such as controllable nanotube geometry, size– and chemically–based selectivity as well as high water permeability. In this work, we first propose a combination of gas phase and surface reaction models to quantitatively describe the growth of carbon nanotubes in PAA membranes in a commercial CVD reactor. A complimentary experimental study of CNT formation from ethanol precursor with argon as a carrier gas is performed. A new method for characterizing carbon nanotubes geometry by SEM and TEM image processing of membrane cross–sections is proposed. The simulations show that the carbon growth rate (in nm/min) averaged over the membrane remains constant during the deposition process until the pore diameter becomes relatively small, and rapidly falls to zero after that. The carbon nanotube thickness near the membrane surface is slightly higher than that in the membrane center. The carbon growth rate increases with synthesis temperature and pressure, while it decreases with the argon flow rate. The dependence of carbon growth rate on the ethanol/water flow rate reaches maximum at some intermediate value. These results are supported by the experimental data obtained from SEM/TEM image processing. It is found that the SEM data provide overestimated values of nanotube diameter and thickness in comparison with the TEM data. The obtained results provide new insights into the CNT growth kinetics in nanoporous media, and develop quantitative guidelines for synthesis of CNT–PAA membranes with precisely controlled nanopore geometry. It also validates the combined homogenous / heterogeneous reaction model by comparison with carbon deposition kinetics on a nanometer scale. Porous anodic alumina (PAA) membranes represent a widely used and extensively studied template for production of carbon nanotubes (CNT). The PAA–CNT membranes possess a number of unique properties, such as controllable nanotube geometry, size– and chemica

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Издание

Журнал: International Journal of Heat and Mass Transfer

Выпуск журнала: Т. 176

Номера страниц: 121414

ISSN журнала: 00179310

Издатель: Elsevier Science Publishing Company, Inc.

Авторы

  • Ryzhkov Ilya I. (Inst Computat Modelling SB RAS, Akademgorodok 50-44, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny 79, Krasnoyarsk 660041, Russia)
  • Kharchenko Ivan A. (Inst Computat Modelling SB RAS, Akademgorodok 50-44, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny 79, Krasnoyarsk 660041, Russia)
  • Mikhlina Elena (Inst Computat Modelling SB RAS, Akademgorodok 50-44, Krasnoyarsk 660036, Russia)
  • Minakov Andrey (Siberian Fed Univ, Svobodny 79, Krasnoyarsk 660041, Russia)
  • Guzei Dmitry (Siberian Fed Univ, Svobodny 79, Krasnoyarsk 660041, Russia)
  • Nemtsev Ivan (Fed Res Ctr KSC SB RAS, Akademgorodok 50-38, Krasnoyarsk 660036, Russia)
  • Volochaev Mikhail N. (Fed Res Ctr KSC SB RAS, Akademgorodok 50-38, Krasnoyarsk 660036, Russia)
  • Korobko Anna (Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia)
  • Simunin Mikhail M. (Siberian Fed Univ, Svobodny 79, Krasnoyarsk 660041, Russia)

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