Key factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes

In this study, the nominal tensile strength, Young's modulus and Weibull scale and shape parameter of the nominal tensile strength distribution of the MWCNTs synthesized by a thermal chemical vapor deposition (CVD) method were investigated by conducting uniaxial tensile tests. In addition,...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Keiichi SHIRASU, Itaru TAMAKI, Takamichi MIYAZAKI, Go YAMAMOTO, Raman BEKAREVICH, Kaori HIRAHARA, Yoshinobu SHIMAMURA, Yoku INOUE, Toshiyuki HASHIDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	carbon nanotubes tensile strength weibull-poisson statistics structural defects heat treatment Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/569b3f87453c4bf1b96a25aa19aade9f
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:569b3f87453c4bf1b96a25aa19aade9f
record_format	dspace
spelling	oai:doaj.org-article:569b3f87453c4bf1b96a25aa19aade9f2021-11-26T07:11:27ZKey factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes2187-974510.1299/mej.17-00029https://doaj.org/article/569b3f87453c4bf1b96a25aa19aade9f2017-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_17-00029/_pdf/-char/enhttps://doaj.org/toc/2187-9745In this study, the nominal tensile strength, Young's modulus and Weibull scale and shape parameter of the nominal tensile strength distribution of the MWCNTs synthesized by a thermal chemical vapor deposition (CVD) method were investigated by conducting uniaxial tensile tests. In addition, the structural defects which induced the failure of the MWCNTs were observed by a transmission electron microscope (TEM). TEM observations revealed that the MWCNTs exhibited several types of structural defects: discontinuous flaws such as holes, kinks and bends and remnant catalysts even though crystalline graphene layers were aligned with the MWCNT axis. The nanotube tested in this study fractured at the structural defects such as discontinuous flaws and kinks and bends, suggesting that the tensile strength of the CVD-grown MWCNTs used in this study was dominated by the above-mentioned structural defects. The tensile-loading experiments demonstrated that the nominal tensile strength, Young's modulus and Weibull scale and shape parameter of the as-grown MWCNTs were 5.2 ± 2.1 GPa, 210 ± 150 GPa, 5.9 GPa and 2.7, respectively. The MWCNTs used in this study showed larger Weibull scale parameter values compared with both the CVD-grown and arc-discharge-grown MWCNTs evaluated an earlier study. This suggested that there was an optimal nanotube structure for increasing nominal tensile strength; not too weak but also not too strong inter-tube coupling to permit an adequate load transfer between the nanotube walls and thus a consequent clean break fracture. We also investigated the effects of the thermal annealing on the mechanical properties of the MWCNTs. The structural changes observed after annealing led to no significant impact on the nominal tensile strength of the MWCNTs, which was mainly due to incomplete removal of the structural defects by thermal annealing.Keiichi SHIRASUItaru TAMAKITakamichi MIYAZAKIGo YAMAMOTORaman BEKAREVICHKaori HIRAHARAYoshinobu SHIMAMURAYoku INOUEToshiyuki HASHIDAThe Japan Society of Mechanical Engineersarticlecarbon nanotubestensile strengthweibull-poisson statisticsstructural defectsheat treatmentMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 17-00029-17-00029 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	carbon nanotubes tensile strength weibull-poisson statistics structural defects heat treatment Mechanical engineering and machinery TJ1-1570
spellingShingle	carbon nanotubes tensile strength weibull-poisson statistics structural defects heat treatment Mechanical engineering and machinery TJ1-1570 Keiichi SHIRASU Itaru TAMAKI Takamichi MIYAZAKI Go YAMAMOTO Raman BEKAREVICH Kaori HIRAHARA Yoshinobu SHIMAMURA Yoku INOUE Toshiyuki HASHIDA Key factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes
description	In this study, the nominal tensile strength, Young's modulus and Weibull scale and shape parameter of the nominal tensile strength distribution of the MWCNTs synthesized by a thermal chemical vapor deposition (CVD) method were investigated by conducting uniaxial tensile tests. In addition, the structural defects which induced the failure of the MWCNTs were observed by a transmission electron microscope (TEM). TEM observations revealed that the MWCNTs exhibited several types of structural defects: discontinuous flaws such as holes, kinks and bends and remnant catalysts even though crystalline graphene layers were aligned with the MWCNT axis. The nanotube tested in this study fractured at the structural defects such as discontinuous flaws and kinks and bends, suggesting that the tensile strength of the CVD-grown MWCNTs used in this study was dominated by the above-mentioned structural defects. The tensile-loading experiments demonstrated that the nominal tensile strength, Young's modulus and Weibull scale and shape parameter of the as-grown MWCNTs were 5.2 ± 2.1 GPa, 210 ± 150 GPa, 5.9 GPa and 2.7, respectively. The MWCNTs used in this study showed larger Weibull scale parameter values compared with both the CVD-grown and arc-discharge-grown MWCNTs evaluated an earlier study. This suggested that there was an optimal nanotube structure for increasing nominal tensile strength; not too weak but also not too strong inter-tube coupling to permit an adequate load transfer between the nanotube walls and thus a consequent clean break fracture. We also investigated the effects of the thermal annealing on the mechanical properties of the MWCNTs. The structural changes observed after annealing led to no significant impact on the nominal tensile strength of the MWCNTs, which was mainly due to incomplete removal of the structural defects by thermal annealing.
format	article
author	Keiichi SHIRASU Itaru TAMAKI Takamichi MIYAZAKI Go YAMAMOTO Raman BEKAREVICH Kaori HIRAHARA Yoshinobu SHIMAMURA Yoku INOUE Toshiyuki HASHIDA
author_facet	Keiichi SHIRASU Itaru TAMAKI Takamichi MIYAZAKI Go YAMAMOTO Raman BEKAREVICH Kaori HIRAHARA Yoshinobu SHIMAMURA Yoku INOUE Toshiyuki HASHIDA
author_sort	Keiichi SHIRASU
title	Key factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes
title_short	Key factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes
title_full	Key factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes
title_fullStr	Key factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes
title_full_unstemmed	Key factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes
title_sort	key factors limiting carbon nanotube strength: structural characterization and mechanical properties of multi-walled carbon nanotubes
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/569b3f87453c4bf1b96a25aa19aade9f
work_keys_str_mv	AT keiichishirasu keyfactorslimitingcarbonnanotubestrengthstructuralcharacterizationandmechanicalpropertiesofmultiwalledcarbonnanotubes AT itarutamaki keyfactorslimitingcarbonnanotubestrengthstructuralcharacterizationandmechanicalpropertiesofmultiwalledcarbonnanotubes AT takamichimiyazaki keyfactorslimitingcarbonnanotubestrengthstructuralcharacterizationandmechanicalpropertiesofmultiwalledcarbonnanotubes AT goyamamoto keyfactorslimitingcarbonnanotubestrengthstructuralcharacterizationandmechanicalpropertiesofmultiwalledcarbonnanotubes AT ramanbekarevich keyfactorslimitingcarbonnanotubestrengthstructuralcharacterizationandmechanicalpropertiesofmultiwalledcarbonnanotubes AT kaorihirahara keyfactorslimitingcarbonnanotubestrengthstructuralcharacterizationandmechanicalpropertiesofmultiwalledcarbonnanotubes AT yoshinobushimamura keyfactorslimitingcarbonnanotubestrengthstructuralcharacterizationandmechanicalpropertiesofmultiwalledcarbonnanotubes AT yokuinoue keyfactorslimitingcarbonnanotubestrengthstructuralcharacterizationandmechanicalpropertiesofmultiwalledcarbonnanotubes AT toshiyukihashida keyfactorslimitingcarbonnanotubestrengthstructuralcharacterizationandmechanicalpropertiesofmultiwalledcarbonnanotubes
_version_	1718409718220718080

Key factors limiting carbon nanotube strength: Structural characterization and mechanical properties of multi-walled carbon nanotubes

Ejemplares similares