Mechanical Behavior of Carbon Nanotube Forests Grown With Plasma Enhanced Chemical Vapor Deposition: Pristine and Conformally CoatedSource: Journal of Engineering Materials and Technology:;2017:;volume( 139 ):;issue: 003::page 34502Author:Pour Shahid Saeed Abadi, Parisa
,
Maschmann, Matthew R.
,
Hodson, Stephen L.
,
Fisher, Timothy S.
,
Baur, Jeffery W.
,
Graham, Samuel
,
Cola, Baratunde A.
DOI: 10.1115/1.4035622Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Plasma-enhanced chemical vapor deposition (PECVD) is a well-known method for the synthesis of carbon nanotube (CNT) forests with the electric field in the plasma sheath being responsible for the vertical orientation of CNTs. Here, we investigate the deformation mechanism and mechanical properties of pristine and conformally coated PECVD CNT forests under compressive loading. Our in situ indentation experiments reveal that local buckles form along the height of pristine CNTs progressing downward from the starting point at the tips. For CNT forests coated from their roots to top with alumina using atomic layer deposition (ALD), the deformation mechanism depends strongly on the coating thickness. The buckling behavior does not change significantly when the coating is 5-nm thick. However, with a 10-nm-thick coating, the nanotubes fracture—that is, at both the CNT core and alumina coating. Ex situ indentation experiments with a flat punch reveal 8- and 22-fold increase in stiffness with the 5- and 10-nm coating, respectively. Comparing the behavior of the PECVD forests with CNTs grown with thermal chemical vapor deposition (CVD) shows that the mechanical behavior of PECVD CNTs depends on their characteristic morphology caused by the growth parameters including plasma. Our findings could serve as guidelines for tailoring the properties of CNT structures for various applications in which CNT compliance or deformation plays a critical role.
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contributor author | Pour Shahid Saeed Abadi, Parisa | |
contributor author | Maschmann, Matthew R. | |
contributor author | Hodson, Stephen L. | |
contributor author | Fisher, Timothy S. | |
contributor author | Baur, Jeffery W. | |
contributor author | Graham, Samuel | |
contributor author | Cola, Baratunde A. | |
date accessioned | 2017-11-25T07:16:15Z | |
date available | 2017-11-25T07:16:15Z | |
date copyright | 2017/23/3 | |
date issued | 2017 | |
identifier issn | 0094-4289 | |
identifier other | mats_139_03_034502.pdf | |
identifier uri | http://138.201.223.254:8080/yetl1/handle/yetl/4233912 | |
description abstract | Plasma-enhanced chemical vapor deposition (PECVD) is a well-known method for the synthesis of carbon nanotube (CNT) forests with the electric field in the plasma sheath being responsible for the vertical orientation of CNTs. Here, we investigate the deformation mechanism and mechanical properties of pristine and conformally coated PECVD CNT forests under compressive loading. Our in situ indentation experiments reveal that local buckles form along the height of pristine CNTs progressing downward from the starting point at the tips. For CNT forests coated from their roots to top with alumina using atomic layer deposition (ALD), the deformation mechanism depends strongly on the coating thickness. The buckling behavior does not change significantly when the coating is 5-nm thick. However, with a 10-nm-thick coating, the nanotubes fracture—that is, at both the CNT core and alumina coating. Ex situ indentation experiments with a flat punch reveal 8- and 22-fold increase in stiffness with the 5- and 10-nm coating, respectively. Comparing the behavior of the PECVD forests with CNTs grown with thermal chemical vapor deposition (CVD) shows that the mechanical behavior of PECVD CNTs depends on their characteristic morphology caused by the growth parameters including plasma. Our findings could serve as guidelines for tailoring the properties of CNT structures for various applications in which CNT compliance or deformation plays a critical role. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Mechanical Behavior of Carbon Nanotube Forests Grown With Plasma Enhanced Chemical Vapor Deposition: Pristine and Conformally Coated | |
type | Journal Paper | |
journal volume | 139 | |
journal issue | 3 | |
journal title | Journal of Engineering Materials and Technology | |
identifier doi | 10.1115/1.4035622 | |
journal fristpage | 34502 | |
journal lastpage | 034502-5 | |
tree | Journal of Engineering Materials and Technology:;2017:;volume( 139 ):;issue: 003 | |
contenttype | Fulltext |