Fe–Mo and Co–Mo Catalysts with Varying Composition for Multi‐Walled Carbon Nanotube Growth. Issue 1 (27th October 2017)

• Record Type: Journal Article
• Authors: Kazakova, Mariya A.; Kuznetsov, Vladimir L.; Bokova‐Sirosh, Sofia N.; Krasnikov, Dmitry V.; Golubtsov, Georgiy V.; Romanenko, Anatoliy I.; Prosvirin, Igor P.; Ishchenko, Arcadiy V.; Orekhov, Andrey S.; Chuvilin, Andrey L.; Obraztsova, Elena D.
• Is Part Of: Physica status solidi. Volume 255:Issue 1(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-10-27
• Subjects: defective structure -- Fe‐Mo and Co‐Mo bimetallic catalyst -- multi‐walled carbon nanotubes -- Pechini method; Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201700260
• Languages: English
• ISSNs: 0370-1972

Abstract

Abstract : The formation of active component of Fe–Mo and Co–Mo catalysts for carbon nanotube growth with variable Mo content is studied with in situ XRD, XPS, and STEM&EDX. The activation of bimetallic Fe–Mo catalysts under the growth conditions leads to the formation of Fe–Mo alloy particles in contrast to Co‐containing catalysts in which active alloy incorporates only a small portion of Mo (<2–3 at.%). The stable carbide formation for these systems is not detected. The effect of Mo content in Fe–Mo and Co–Mo catalysts on the properties of MWCNTs is additionally investigated using the Raman spectroscopy in combination with measurements of the temperature dependence of conductivity. It is shown that MWCNT defectiveness depends on the active component composition for both Fe–Mo and Co–Mo catalysts. The current carrier concentration for the MWCNTs grown on Fe–Mo catalysts slightly increases with the Mo content. The opposite effect is observed for the tubes grown on Co–Mo catalysts, showing a decrease in the current carrier concentration with the increase of Mo concentration. Abstract : The effect of Mo in Fe–Mo and Co–Mo catalysts on the properties of MWCNTs grown by the catalytic chemical vapor deposition (CCVD) method is studied in detail. Activation of the catalysts with a variable Mo content is investigated by in situ XRD, XPS, and STEM&EDX. The different influence of Mo promoter on the active component formation and tube nucleation explains the changes of tube morphology and microstructure.