English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  State of Transition Metal Catalysts During Carbon Nanotube Growth

Hofmann, S., Blume, R., Wirth, C. T., Cantoro, M., Sharma, R., Ducati, C., et al. (2009). State of Transition Metal Catalysts During Carbon Nanotube Growth. Journal of Physical Chemistry C, 113(5), 1648-1656. doi:10.1021/jp808560p.

Item is

Files

show Files
hide Files
:
424235 JPhysChemC113.pdf (Preprint), 2MB
 
File Permalink:
-
Name:
424235 JPhysChemC113.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-
:
736358CTA.pdf (Copyright transfer agreement), 795KB
 
File Permalink:
-
Name:
736358CTA.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-
:
736358.pdf (Correspondence), 4MB
 
File Permalink:
-
Name:
736358.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Hofmann, Stephan, Author
Blume, Raoul1, Author              
Wirth, Christoph T., Author
Cantoro, Mirco, Author
Sharma, Renu, Author
Ducati, Caterina, Author
Hävecker, Michael1, Author              
Zafeiratos, Spiros1, Author              
Schnörch, Peter1, Author              
Oestereich, Andreas1, Author              
Teschner, Detre1, Author              
Albrecht, Martin, Author
Knop-Gericke, Axel1, Author              
Schlögl, Robert1, Author              
Robertson, John, Author
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

Content

show
hide
Free keywords: CNT; SWNT; chemical vapor deposition; environmental transmission microscopy; XPS; Carbon in catalysis
 Abstract: We study catalyst−support and catalyst−carbon interactions during the chemical vapor deposition of single-walled carbon nanotubes by combining environmental transmission microscopy and in situ, time-resolved X-ray photoelectron spectroscopy. We present direct evidence of what constitutes catalyst functionality by comparing the behavior of Ni, Fe, Pd, and Au model catalyst films on SiO2 during preannealing in O2 and NH3 and during C2H2 decomposition. The catalyst metal surface supplies sites to dissociate the hydrocarbon precursor and then guides the formation of a carbon lattice and the liftoff of a carbon cap. The catalysts are sharply distinguished by their reactivity toward activation of the hydrocarbon precursor, following trends known from heterogeneous catalysis. For Fe and Ni, the active state of the catalyst is a crystalline metallic nanoparticle. Graphitic networks do not form on oxidized Fe. Pd forms a silicide on SiO2 under our reducing conditions. Pd (silicides) and Au nanocrystals are catalytically less efficient in terms of precursor dissociation, while the low adhesion of C on Au surfaces impedes nanotube nucleation.

Details

show
hide
Language(s): eng - English
 Dates: 2009-01-14
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 424235
DOI: 10.1021/jp808560p
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Physical Chemistry C
  Alternative Title : J. Phys. Chem. C
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 113 (5) Sequence Number: - Start / End Page: 1648 - 1656 Identifier: -