Structural changes in iron oxide and gold catalysts during nucleation of carbon nanotubes studied by in situ transmission electron microscopy

ACS Nano
Dai-Ming TangHui-Ming Cheng

Abstract

We report a simple, versatile in situ transmission electron microscopy (TEM) approach for investigating the nucleation and growth mechanism of carbon nanotubes (CNTs), by which the composition, phase transition, and physical state of various catalysts can be clearly resolved. In our approach, catalyst nanoparticles (NPs) are placed in a multiwall CNT "tubular furnace" with two open ends, and a high temperature is obtained by Joule heating in the specimen chamber of a TEM. The carbon is supplied by electron irradiation-induced injection of carbon atoms. Comparative studies on the catalytic behavior of traditional iron oxide and recently discovered gold catalysts were performed. It was found that the growth of CNTs from iron oxide involves the reduction of Fe2O3 to Fe3C, nucleation and growth of CNTs from partially liquefied Fe3C, and finally the formation of elemental Fe when the growth stops. In contrast, while changes in shape, size, and orientation were also observed for the fluctuating Au NPs, no chemical reactions or phase transitions occurred during the nucleation of CNTs. These two distinct nucleation and growth processes and mechanisms would be valuable for the structure-controlled growth of CNTs by catalyst design and e...Continue Reading

References

Feb 15, 1988·Physical Review Letters·P M Ajayan, L D Marks
Jul 17, 1989·Physical Review Letters·P M Ajayan, L D Marks
Jan 30, 2004·Nature·Stig HelvegJens K Nørskov
Jul 13, 2004·Physical Review Letters·Toshinari IchihashiYukinori Ochiai
Aug 27, 2005·Journal of Electron Microscopy·Renu SharmaSteven J Stuart
Oct 14, 2005·Journal of the American Chemical Society·Sergei M BachiloR Bruce Weisman
Dec 14, 2006·Nano Letters·Daisuke TakagiYoshihiro Kobayashi
Feb 8, 2007·Journal of the American Chemical Society·Sreekar BhaviripudiJing Kong
Jul 3, 2007·Nano Letters·Ming LinYong-Lim Foo
Jul 20, 2007·Nano Letters·Daisuke TakagiYoshikazu Homma
Dec 7, 2007·Journal of the American Chemical Society·Xiaolin LiHongjie Dai
Feb 8, 2008·Nano Letters·Daisuke TakagiYoshikazu Homma
Jul 26, 2008·Nature Nanotechnology·Julio A Rodríguez-ManzoFlorian Banhart
Jan 23, 2009·Journal of the American Chemical Society·Shaoming HuangLijie Zhang
Jan 28, 2009·Journal of the American Chemical Society·Bilu LiuHui-Ming Cheng
Sep 11, 2009·Small·Julio A Rodríguez-ManzoFlorian Banhart
Sep 26, 2009·Journal of the American Chemical Society·Guo HongZhongfan Liu
Oct 3, 2009·Science·Avetik R HarutyunyanGamini U Sumanasekera
Jun 24, 2010·Journal of the American Chemical Society·Zohreh GhorannevisRikizo Hatakeyama
Sep 23, 2010·Journal of the American Chemical Society·Maoshuai HeA Outi I Krause
Oct 22, 2010·Chemical Communications : Chem Comm·Wan-Jing YuHui-Ming Cheng
Nov 6, 2010·Journal of the American Chemical Society·Hong WangYuan Chen

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Citations

Dec 2, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Xi He, Huaming Yang
May 6, 2016·Journal of the American Chemical Society·Chang Liu, Hui-Ming Cheng
Aug 25, 2018·Nature Communications·Kecheng CaoAndrei N Khlobystov
Sep 16, 2020·Nature Communications·Yafei SunYing Wan
Apr 17, 2014·The Journal of Physical Chemistry Letters·Lili ZhangHui-Ming Cheng
Feb 11, 2020·Chemical Reviews·Feng YangYan Li

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