Mechanism of WS<sub>2</sub> Nanotube Formation Revealed by <i>in Situ</i>/<i>ex Situ</i> Imaging

Simple item page
dc.contributor.authorKundrát, Vojtěchcs
dc.contributor.authorNovák, Liborcs
dc.contributor.authorBukvišová, Kristýnacs
dc.contributor.authorZálešák, Jakubcs
dc.contributor.authorKolíbalová, Evacs
dc.contributor.authorRosentveig, Ritacs
dc.contributor.authorSreedhara, M.B.cs
dc.contributor.authorShalom, Hilacs
dc.contributor.authorYadgarov, Lenacs
dc.contributor.authorZak, Allacs
dc.contributor.authorKolíbal, Miroslavcs
dc.contributor.authorTenne, Reshefcs
dc.coverage.issue19cs
dc.coverage.volume18cs
dc.date.accessioned2024-10-14T09:03:55Z
dc.date.available2024-10-14T09:03:55Z
dc.date.issued2024-05-03cs
dc.description.abstractMultiwall WS2 nanotubes have been synthesized from W18O49 nanowhiskers in substantial amounts for more than a decade. The established growth model is based on the "surface-inward" mechanism, whereby the high-temperature reaction with H2S starts on the nanowhisker surface, and the oxide-to-sulfide conversion progresses inward until hollow-core multiwall WS2 nanotubes are obtained. In the present work, an upgraded in situ SEM mu Reactor with H-2 and H2S sources has been conceived to study the growth mechanism in detail. A hitherto undescribed growth mechanism, named "receding oxide core", which complements the "surface-inward" model, is observed and kinetically evaluated. Initially, the nanowhisker is passivated by several WS2 layers via the surface-inward reaction. At this point, the diffusion of H2S through the already existing outer layers becomes exceedingly sluggish, and the surface-inward reaction is slowed down appreciably. Subsequently, the tungsten suboxide core is anisotropically volatilized within the core close to its tips. The oxide vapors within the core lead to its partial out-diffusion, partially forming a cavity that expands with reaction time. Additionally, the oxide vapors react with the internalized H2S gas, forming fresh WS2 layers in the cavity of the nascent nanotube. The rate of the receding oxide core mode increases with temperatures above 900 degrees C. The growth of nanotubes in the atmospheric pressure flow reactor is carried out as well, showing that the proposed growth model (receding oxide core) is also relevant under regular reaction parameters. The current study comprehensively explains the WS2 nanotube growth mechanism, combining the known model with contemporary insight.en
dc.formattextcs
dc.format.extent12284-12294cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationACS Nano. 2024, vol. 18, issue 19, p. 12284-12294.en
dc.identifier.doi10.1021/acsnano.4c01150cs
dc.identifier.issn1936-0851cs
dc.identifier.orcid0000-0001-8530-8298cs
dc.identifier.orcid0000-0002-8548-8185cs
dc.identifier.orcid0000-0002-2751-5608cs
dc.identifier.other188679cs
dc.identifier.researcheridD-9301-2012cs
dc.identifier.urihttps://hdl.handle.net/11012/249513
dc.language.isoencs
dc.publisherAMER CHEMICAL SOCcs
dc.relation.ispartofACS Nanocs
dc.relation.urihttps://pubs.acs.org/doi/10.1021/acsnano.4c01150cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1936-0851/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectWS2 nanotubeen
dc.subjectsulfidationen
dc.subjectin situen
dc.subjectex situen
dc.subjectelectronmicroscopyen
dc.subjectreaction mechanismen
dc.titleMechanism of WS<sub>2</sub> Nanotube Formation Revealed by <i>in Situ</i>/<i>ex Situ</i> Imagingen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
eprints.grantNumberinfo:eu-repo/grantAgreement/TA0/TN/TN02000020cs
sync.item.dbidVAV-188679en
sync.item.dbtypeVAVen
sync.item.insts2024.10.14 11:03:55en
sync.item.modts2024.09.20 11:32:10en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav fyzikálního inženýrstvícs
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Příprava a charakterizace nanostrukturcs
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
kundratetal2024mechanismofws2nanotubeformationrevealedbyinsituexsituimaging.pdf
Size:
10.12 MB
Format:
Adobe Portable Document Format
Description:
file kundratetal2024mechanismofws2nanotubeformationrevealedbyinsituexsituimaging.pdf
Download
Collections
Ústav fyzikálního inženýrství
Příprava a charakterizace nanostruktur