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.articleNumber17en_US
dc.citation.issueNumber1en_US
dc.citation.journalTitleCen_US
dc.citation.volumeNumber4en_US
dc.contributor.authorEsquenazi, Gibran L.en_US
dc.contributor.authorBrinson, Bruceen_US
dc.contributor.authorBarron, Andrew R.en_US
dc.date.accessioned2018-07-11T20:57:33Zen_US
dc.date.available2018-07-11T20:57:33Zen_US
dc.date.issued2018en_US
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.en_US
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.en_US
dc.identifier.doihttps://doi.org/10.3390/c4010017en_US
dc.identifier.urihttps://hdl.handle.net/1911/102409en_US
dc.language.isoengen_US
dc.publisherMDPIen_US
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/).en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.subject.keywordcarbon nanotubeen_US
dc.subject.keywordironen_US
dc.subject.keywordmolybdenumen_US
dc.subject.keywordnanoclusteren_US
dc.subject.keywordCVDen_US
dc.subject.keyworddirect liquid injectionen_US
dc.titleCatalytic Growth of Carbon Nanotubes by Direct Liquid Injection CVD Using the Nanocluster [HxPMo12O40⊂H4Mo72Fe30(O2CMe)15O254(H2O)98-y(EtOH)y]en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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