Catalytic Growth of Carbon Nanotubes by Direct Liquid Injection CVD Using the Nanocluster [HxPMo12O40⊂H4Mo72Fe30(O2CMe)15O254(H2O)98-y(EtOH)y]

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dc.citation.articleNumber17
dc.citation.issueNumber1
dc.citation.journalTitleC
dc.citation.volumeNumber4
dc.contributor.authorEsquenazi, Gibran L.
dc.contributor.authorBrinson, Bruce
dc.contributor.authorBarron, Andrew R.
dc.date.accessioned2018-07-11T20:57:33Z
dc.date.available2018-07-11T20:57:33Z
dc.date.issued2018
dc.description.abstractThe growth of carbon nanotubes (CNTs) by direct liquid injection chemical vapor deposition (DLICVD) has been studied using the polyoxometalate cluster [HxPMo12O40⊂H4Mo72Fe30(O2CMe)15O254(H2O)98-y(EtOH)y] (FeMoC) as the catalyst with either ethanol or toluene as the carbon source. In order to screen different growth conditions a single large batch of FeMoC is required in order to eliminate variation in the catalyst precursor. The preparation of 6 g of FeMoC is possible by scaling (10×) literature reagent ratios. DLICVD studies of the FeMoC derived carbon product were evaluated by Raman spectroscopy and scanning electron microscopy (SEM) to determine the quality (G:D ratio) and purity of CNT content. With the use of ethanol as the carbon source, increasing the temperature in the injection zone (aspiration temperature) above 250 °C increases the yield, and results in a slight increase in the G:D ratio. The maximum yield is obtained with a growth temperature of 900 °C, while the G:D ratio is the highest at higher temperatures. Faster solution injection rates increase yield, but with a significant decrease in G:D, in fact no CNTs are observed in the product for the highest injection rate (10 mL/h). An optimum catalyst concentration of 1.25 wt.% is found, which influences both the catalyst:C and catalyst:H ratios within the system. Growth at 800 °C is far more efficient for toluene as a carbon source than ethanol. The resulting “process map” allows for large quantities of CNTs to be prepared by DLICVD.
dc.identifier.citationEsquenazi, Gibran L., Brinson, Bruce and Barron, Andrew R.. "Catalytic Growth of Carbon Nanotubes by Direct Liquid Injection CVD Using the Nanocluster [HxPMo12O40⊂H4Mo72Fe30(O2CMe)15O254(H2O)98-y(EtOH)y]." <i>C,</i> 4, no. 1 (2018) MDPI: https://doi.org/10.3390/c4010017.
dc.identifier.doihttps://doi.org/10.3390/c4010017
dc.identifier.urihttps://hdl.handle.net/1911/102409
dc.language.isoeng
dc.publisherMDPI
dc.rightsThis article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.keywordcarbon nanotube
dc.subject.keywordiron
dc.subject.keywordmolybdenum
dc.subject.keywordnanocluster
dc.subject.keywordCVD
dc.subject.keyworddirect liquid injection
dc.titleCatalytic Growth of Carbon Nanotubes by Direct Liquid Injection CVD Using the Nanocluster [HxPMo12O40⊂H4Mo72Fe30(O2CMe)15O254(H2O)98-y(EtOH)y]
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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