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Investigation of catalyst composition for cobalt and iron catalyst on the chirality of grown single walled carbon nanotubes
Umeå University, Faculty of Science and Technology, Department of Physics.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The synthesis of type-enriched semiconducting or metallic single-walled carbon nanotubes (sc/m-SWCNTs) with high quality by means of catalytic chemical vapor deposition (CCVD) are essential prerequisites for implementing of SWCNTs into nanodevices. In particular, the Fe−Co bimetallic catalysts system is promising due to its ability to grow SWCNTs by CCVD. However, there is still a gap in understanding how to adjust catalyst composition aiming further improvements in SWCNTs properties with respect to the electronic type. In particular, formation of well-defined nanoalloy of bimetallic catalysts during catalyst conditioning as well as its impact on SWCNTs growth are not clearly understood. Here we present a systematic investigation on effects of catalyst composition based on different Molar ratios of Fe:Co catalysts on the properties of CCVD grown SWCNTs using Raman spectroscopy. After CVD growth of SWCNTs on different molar ratios of Fe:Co, We find that by using molar ratio of Fe:Co=1:1.5, growth of SWNTs that are strongly dominated by two types of semiconducting tubes, the (7,5) and (12,1) tubes, can be achieved.

Place, publisher, year, edition, pages
2017.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-133186OAI: oai:DiVA.org:umu-133186DiVA: diva2:1086358
Subject / course
Fysik D - examensarbete
Educational program
Master's Programme in Physics
Available from: 2017-04-10 Created: 2017-04-01 Last updated: 2017-04-10Bibliographically approved

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fulltext(2903 kB)29 downloads
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52b74f432a537684a13fa8cb714c0f1968ea11b9ddb5f5b7cf0fbbfe68a82010e1df472426e3f4ff36d97a39050ae3e7d7d697d37f63e3dcfc5d312cbf347065
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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf