Environmental transmission electron microscopy investigations of Pt-Fe2O3 nanoparticles for nucleating carbon nanotubes

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Environmental transmission electron microscopy investigations of Pt-Fe2O3 nanoparticles for nucleating carbon nanotubes. / He, Maoshuai; Jin, Hua; Zhang, Lili; Jiang, Hua; Yang, Tao; Cui, Hongzhi; Fossard, Frédéric; Wagner, Jakob B.; Karppinen, Maarit; Kauppinen, Esko I.; Loiseau, Annick.

In: Carbon, Vol. 110, 01.12.2016, p. 243-248.

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He, Maoshuai ; Jin, Hua ; Zhang, Lili ; Jiang, Hua ; Yang, Tao ; Cui, Hongzhi ; Fossard, Frédéric ; Wagner, Jakob B. ; Karppinen, Maarit ; Kauppinen, Esko I. ; Loiseau, Annick. / Environmental transmission electron microscopy investigations of Pt-Fe2O3 nanoparticles for nucleating carbon nanotubes. In: Carbon. 2016 ; Vol. 110. pp. 243-248.

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@article{262396ebc8ff4a32a5c93402f3c926cc,
title = "Environmental transmission electron microscopy investigations of Pt-Fe2O3 nanoparticles for nucleating carbon nanotubes",
abstract = "Elucidating the evolution of bimetallic catalyst for nucleating carbon nanotube has been challenging. In this work, acorn-like Pt-Fe2O3 nanoparticles are developed for the growth of single-walled carbon nanotubes (SWCNTs) by chemical vapor deposition. Using in situ environmental transmission electron microscopy, restructuring of the acorn-like Pt-Fe2O3 nanoparticles at reaction conditions is investigated. Upon heating to reaction temperature, ε-Fe2O3 is converted to β-Fe2O3, which can be subsequently reduced to metallic Fe once introducing CO. As Pt promotes the carburization of Fe, part of the metallic Fe reacts with active carbon atoms to form Fe2.5C instead of Fe3C, catalyzing the nucleation of carbon nanotubes. Nanobeam electron diffraction characterizations on SWCNTs grown under ambient pressure at 800 °C demonstrate that their chiral angle and diameter distributions are similar to those of SWCNTs grown on monometallic Fe. The results further indicate that the active components in both the catalysts, determining the chirality distribution of SWCNTs, are similar. In addition, Pt facilitates the reduction of Fe2O3, rendering SWCNT growth at a relatively low temperature of 700 °C. This work provides a profound understanding of the structural reconstruction in bimetallic catalyst, shedding more light on designing novel catalysts for the growth of SWCNTs.",
keywords = "Chirality, In situ environmental transmission electron microscopy, Pt-Fe bimetallic catalyst, Single-walled carbon nanotube, Structural evolution",
author = "Maoshuai He and Hua Jin and Lili Zhang and Hua Jiang and Tao Yang and Hongzhi Cui and Fr{\'e}d{\'e}ric Fossard and Wagner, {Jakob B.} and Maarit Karppinen and Kauppinen, {Esko I.} and Annick Loiseau",
year = "2016",
month = "12",
day = "1",
doi = "10.1016/j.carbon.2016.09.026",
language = "English",
volume = "110",
pages = "243--248",
journal = "Carbon",
issn = "0008-6223",

}

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TY - JOUR

T1 - Environmental transmission electron microscopy investigations of Pt-Fe2O3 nanoparticles for nucleating carbon nanotubes

AU - He, Maoshuai

AU - Jin, Hua

AU - Zhang, Lili

AU - Jiang, Hua

AU - Yang, Tao

AU - Cui, Hongzhi

AU - Fossard, Frédéric

AU - Wagner, Jakob B.

AU - Karppinen, Maarit

AU - Kauppinen, Esko I.

AU - Loiseau, Annick

PY - 2016/12/1

Y1 - 2016/12/1

N2 - Elucidating the evolution of bimetallic catalyst for nucleating carbon nanotube has been challenging. In this work, acorn-like Pt-Fe2O3 nanoparticles are developed for the growth of single-walled carbon nanotubes (SWCNTs) by chemical vapor deposition. Using in situ environmental transmission electron microscopy, restructuring of the acorn-like Pt-Fe2O3 nanoparticles at reaction conditions is investigated. Upon heating to reaction temperature, ε-Fe2O3 is converted to β-Fe2O3, which can be subsequently reduced to metallic Fe once introducing CO. As Pt promotes the carburization of Fe, part of the metallic Fe reacts with active carbon atoms to form Fe2.5C instead of Fe3C, catalyzing the nucleation of carbon nanotubes. Nanobeam electron diffraction characterizations on SWCNTs grown under ambient pressure at 800 °C demonstrate that their chiral angle and diameter distributions are similar to those of SWCNTs grown on monometallic Fe. The results further indicate that the active components in both the catalysts, determining the chirality distribution of SWCNTs, are similar. In addition, Pt facilitates the reduction of Fe2O3, rendering SWCNT growth at a relatively low temperature of 700 °C. This work provides a profound understanding of the structural reconstruction in bimetallic catalyst, shedding more light on designing novel catalysts for the growth of SWCNTs.

AB - Elucidating the evolution of bimetallic catalyst for nucleating carbon nanotube has been challenging. In this work, acorn-like Pt-Fe2O3 nanoparticles are developed for the growth of single-walled carbon nanotubes (SWCNTs) by chemical vapor deposition. Using in situ environmental transmission electron microscopy, restructuring of the acorn-like Pt-Fe2O3 nanoparticles at reaction conditions is investigated. Upon heating to reaction temperature, ε-Fe2O3 is converted to β-Fe2O3, which can be subsequently reduced to metallic Fe once introducing CO. As Pt promotes the carburization of Fe, part of the metallic Fe reacts with active carbon atoms to form Fe2.5C instead of Fe3C, catalyzing the nucleation of carbon nanotubes. Nanobeam electron diffraction characterizations on SWCNTs grown under ambient pressure at 800 °C demonstrate that their chiral angle and diameter distributions are similar to those of SWCNTs grown on monometallic Fe. The results further indicate that the active components in both the catalysts, determining the chirality distribution of SWCNTs, are similar. In addition, Pt facilitates the reduction of Fe2O3, rendering SWCNT growth at a relatively low temperature of 700 °C. This work provides a profound understanding of the structural reconstruction in bimetallic catalyst, shedding more light on designing novel catalysts for the growth of SWCNTs.

KW - Chirality

KW - In situ environmental transmission electron microscopy

KW - Pt-Fe bimetallic catalyst

KW - Single-walled carbon nanotube

KW - Structural evolution

UR - http://www.scopus.com/inward/record.url?scp=84987956517&partnerID=8YFLogxK

U2 - 10.1016/j.carbon.2016.09.026

DO - 10.1016/j.carbon.2016.09.026

M3 - Article

VL - 110

SP - 243

EP - 248

JO - Carbon

JF - Carbon

SN - 0008-6223

ER -

ID: 8654974