Effect of alignment on adsorption characteristics of self-oriented multi-walled carbon nanotube arrays

The adsorption characteristics of self-oriented multi-walled carbon nanotube (MWCNT) arrays are examined from N2 (-196 °C) adsorption measurements. The arrays were synthesized in a laboratory by in situ chemical vapour deposition of iron or cobalt phthalocyanines at 880 and 950 °C, under otherwise c...

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Autores principales: Zilli, D., Bonelli, P.R., Cukierman, A.L.
Formato: JOUR
Materias:
Brunauer-Emmett-Teller (BET)
Cobalt phthalocyanines
Iron phthalocyanines
Multi-walled carbon nanotube (MWCNT) arrays
Adsorption
Arrays
Iron compounds
Measurement theory
Morphology
Nitrogen compounds
Scanning electron microscopy
Transmission electron microscopy
Carbon nanotubes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09574484_v17_n20_p5136_Zilli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_09574484_v17_n20_p5136_Zilli2023-10-03T15:52:33Z Effect of alignment on adsorption characteristics of self-oriented multi-walled carbon nanotube arrays Zilli, D. Bonelli, P.R. Cukierman, A.L. Brunauer-Emmett-Teller (BET) Cobalt phthalocyanines Iron phthalocyanines Multi-walled carbon nanotube (MWCNT) arrays Adsorption Arrays Iron compounds Measurement theory Morphology Nitrogen compounds Scanning electron microscopy Transmission electron microscopy Carbon nanotubes The adsorption characteristics of self-oriented multi-walled carbon nanotube (MWCNT) arrays are examined from N2 (-196 °C) adsorption measurements. The arrays were synthesized in a laboratory by in situ chemical vapour deposition of iron or cobalt phthalocyanines at 880 and 950 °C, under otherwise constant conditions, in an attempt to obtain different morphological structures. For both precursors, increasing the temperature leads to MWCNT arrays with lower Brunauer-Emmett-Teller (BET) surface area and total pore volume, though the effect is more pronounced for those arising from the iron-based compound. Despite this, precursor yields of individual nanotubes of larger diameter, higher BET area and total pore volume characterize the resulting arrays compared to those arising from cobalt phthalocyanine for the same temperatures. As evidenced by SEM and TEM images, the arrays synthesized from iron phthalocyanine at 880 °C show better vertical alignment and denser structures than those obtained from this compound at 950 °C, and also from cobalt phthalocyanine at both temperatures. Further ultrasonication of the arrays produced from the iron compound brings about a significant reduction in their adsorption capacity, attributable to the pronounced disarrangement of the resulting structures. The present results demonstrate that the alignment of MWCNT arrays plays a crucial role in their N2 adsorption characteristics. © 2006 IOP Publishing Ltd. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09574484_v17_n20_p5136_Zilli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Brunauer-Emmett-Teller (BET)
Cobalt phthalocyanines
Iron phthalocyanines
Multi-walled carbon nanotube (MWCNT) arrays
Adsorption
Arrays
Iron compounds
Measurement theory
Morphology
Nitrogen compounds
Scanning electron microscopy
Transmission electron microscopy
Carbon nanotubes
spellingShingle Brunauer-Emmett-Teller (BET)
Cobalt phthalocyanines
Iron phthalocyanines
Multi-walled carbon nanotube (MWCNT) arrays
Adsorption
Arrays
Iron compounds
Measurement theory
Morphology
Nitrogen compounds
Scanning electron microscopy
Transmission electron microscopy
Carbon nanotubes
Zilli, D.
Bonelli, P.R.
Cukierman, A.L.
Effect of alignment on adsorption characteristics of self-oriented multi-walled carbon nanotube arrays
topic_facet Brunauer-Emmett-Teller (BET)
Cobalt phthalocyanines
Iron phthalocyanines
Multi-walled carbon nanotube (MWCNT) arrays
Adsorption
Arrays
Iron compounds
Measurement theory
Morphology
Nitrogen compounds
Scanning electron microscopy
Transmission electron microscopy
Carbon nanotubes
description The adsorption characteristics of self-oriented multi-walled carbon nanotube (MWCNT) arrays are examined from N2 (-196 °C) adsorption measurements. The arrays were synthesized in a laboratory by in situ chemical vapour deposition of iron or cobalt phthalocyanines at 880 and 950 °C, under otherwise constant conditions, in an attempt to obtain different morphological structures. For both precursors, increasing the temperature leads to MWCNT arrays with lower Brunauer-Emmett-Teller (BET) surface area and total pore volume, though the effect is more pronounced for those arising from the iron-based compound. Despite this, precursor yields of individual nanotubes of larger diameter, higher BET area and total pore volume characterize the resulting arrays compared to those arising from cobalt phthalocyanine for the same temperatures. As evidenced by SEM and TEM images, the arrays synthesized from iron phthalocyanine at 880 °C show better vertical alignment and denser structures than those obtained from this compound at 950 °C, and also from cobalt phthalocyanine at both temperatures. Further ultrasonication of the arrays produced from the iron compound brings about a significant reduction in their adsorption capacity, attributable to the pronounced disarrangement of the resulting structures. The present results demonstrate that the alignment of MWCNT arrays plays a crucial role in their N2 adsorption characteristics. © 2006 IOP Publishing Ltd.
format JOUR
author Zilli, D.
Bonelli, P.R.
Cukierman, A.L.
author_facet Zilli, D.
Bonelli, P.R.
Cukierman, A.L.
author_sort Zilli, D.
title Effect of alignment on adsorption characteristics of self-oriented multi-walled carbon nanotube arrays
title_short Effect of alignment on adsorption characteristics of self-oriented multi-walled carbon nanotube arrays
title_full Effect of alignment on adsorption characteristics of self-oriented multi-walled carbon nanotube arrays
title_fullStr Effect of alignment on adsorption characteristics of self-oriented multi-walled carbon nanotube arrays
title_full_unstemmed Effect of alignment on adsorption characteristics of self-oriented multi-walled carbon nanotube arrays
title_sort effect of alignment on adsorption characteristics of self-oriented multi-walled carbon nanotube arrays
url http://hdl.handle.net/20.500.12110/paper_09574484_v17_n20_p5136_Zilli
work_keys_str_mv AT zillid effectofalignmentonadsorptioncharacteristicsofselforientedmultiwalledcarbonnanotubearrays
AT bonellipr effectofalignmentonadsorptioncharacteristicsofselforientedmultiwalledcarbonnanotubearrays
AT cukiermanal effectofalignmentonadsorptioncharacteristicsofselforientedmultiwalledcarbonnanotubearrays
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