Effect of alignment on adsorption characteristics of self-oriented multi-walled carbonnanotube arrays
Identifieur interne : 000830 ( Main/Exploration ); précédent : 000829; suivant : 000831Effect of alignment on adsorption characteristics of self-oriented multi-walled carbonnanotube arrays
Auteurs : D. Zilli [Argentine] ; P R Bonelli [Argentine] ; A L Cukierman [Argentine]Source :
- Nanotechnology [ 0957-4484 ] ; 2006.
Abstract
The adsorption characteristics of self-oriented multi-walled carbon nanotube (MWCNT) arrays are examinedfrom N2 (196C) adsorption measurements. The arrays were synthesized in a laboratory by insitu chemical vapour deposition of iron or cobalt phthalocyanines at 880 and950C, under otherwise constant conditions, in an attempt to obtain different morphologicalstructures. For both precursors, increasing the temperature leads to MWCNT arrays withlower BrunauerEmmettTeller (BET) surface area and total pore volume, thoughthe effect is more pronounced for those arising from the iron-based compound.Despite this, precursor yields of individual nanotubes of larger diameter, higherBET area and total pore volume characterize the resulting arrays compared tothose arising from cobalt phthalocyanine for the same temperatures. As evidencedby SEM and TEM images, the arrays synthesized from iron phthalocyanine at880C show better vertical alignment and denser structures than those obtained from this compound at950C, and also from cobalt phthalocyanine at both temperatures. Further ultrasonication of thearrays produced from the iron compound brings about a significant reduction in their adsorptioncapacity, attributable to the pronounced disarrangement of the resulting structures. Thepresent results demonstrate that the alignment of MWCNT arrays plays a crucial role in theirN2 adsorption characteristics.
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DOI: 10.1088/0957-4484/17/20/016
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The arrays were synthesized in a laboratory by insitu chemical vapour deposition of iron or cobalt phthalocyanines at 880 and950C, under otherwise constant conditions, in an attempt to obtain different morphologicalstructures. For both precursors, increasing the temperature leads to MWCNT arrays withlower BrunauerEmmettTeller (BET) surface area and total pore volume, thoughthe effect is more pronounced for those arising from the iron-based compound.Despite this, precursor yields of individual nanotubes of larger diameter, higherBET area and total pore volume characterize the resulting arrays compared tothose arising from cobalt phthalocyanine for the same temperatures. As evidencedby SEM and TEM images, the arrays synthesized from iron phthalocyanine at880C show better vertical alignment and denser structures than those obtained from this compound at950C, and also from cobalt phthalocyanine at both temperatures. Further ultrasonication of thearrays produced from the iron compound brings about a significant reduction in their adsorptioncapacity, attributable to the pronounced disarrangement of the resulting structures. Thepresent results demonstrate that the alignment of MWCNT arrays plays a crucial role in theirN2 adsorption characteristics.</div></front></TEI><affiliations><list><country><li>Argentine</li></country></list><tree><country name="Argentine"><noRegion><name sortKey="Zilli, D" sort="Zilli, D" uniqKey="Zilli D" first="D" last="Zilli">D. Zilli</name></noRegion><name sortKey="Bonelli, P R" sort="Bonelli, P R" uniqKey="Bonelli P" first="P R" last="Bonelli">P R Bonelli</name><name sortKey="Bonelli, P R" sort="Bonelli, P R" uniqKey="Bonelli P" first="P R" last="Bonelli">P R Bonelli</name><name sortKey="Cukierman, A L" sort="Cukierman, A L" uniqKey="Cukierman A" first="A L" last="Cukierman">A L Cukierman</name><name sortKey="Cukierman, A L" sort="Cukierman, A L" uniqKey="Cukierman A" first="A L" last="Cukierman">A L Cukierman</name><name sortKey="Cukierman, A L" sort="Cukierman, A L" uniqKey="Cukierman A" first="A L" last="Cukierman">A L Cukierman</name><name sortKey="Cukierman, A L" sort="Cukierman, A L" uniqKey="Cukierman A" first="A L" last="Cukierman">A L Cukierman</name><name sortKey="Zilli, D" sort="Zilli, D" uniqKey="Zilli D" first="D" last="Zilli">D. Zilli</name><name sortKey="Zilli, D" sort="Zilli, D" uniqKey="Zilli D" first="D" last="Zilli">D. 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