Effect of heat treatment on morphology and thermal decomposition kinetics of multiwalled carbon nanotubes
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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Title |
Effect of heat treatment on morphology and thermal decomposition kinetics of multiwalled carbon nanotubes
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Creator |
Sarkar, Soumya
Das, Probal Kumar Bysakh, Sandip |
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Subject |
Physical Properties
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Description |
High temperature treatment in inert atmosphere proved to be an effective way to improve high temperature stability of MWNTs in ambient condition. TEM analysis of heat-treated MWNTs confirmed successful removal of impurities and formation of ordered graphene layers and internal bamboo structure. TG-DTG curves indicated that decomposition range and rate of as-received MWNTs were narrow and notably higher, respectively, than heat-treated MWNTs mainly due to presence of impurities like metal nanoparticles in the former. Non-isothermal kinetic analysis revealed that the rate determining mechanism for as-received MWNTs was random nucleation and growth of active species. However, for heat-treated MWNTs, rate controlling mechanism was chemical reaction. Higher activation energies (similar to 203 kJ molt and 280 kJ mol(-1)) and reaction orders (3 and 4) of MWNTs heat-treated at 1200 degrees C and 1800 degrees C in inert, respectively, indicated delayed thermal decomposition than as-received MWNTs (E(a) approximate to 178 kJ mol(-1); n =1) even in oxidative atmosphere. (C) 2010 Elsevier B.V. All rights reserved.
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Publisher |
Elsevier
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Date |
2011-01
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://cgcri.csircentral.net/347/1/Mater_Chem_Phys_125_(2011)_161%E2%80%93167.pdf
Sarkar, Soumya and Das, Probal Kumar and Bysakh, Sandip (2011) Effect of heat treatment on morphology and thermal decomposition kinetics of multiwalled carbon nanotubes. Materials Chemistry and Physics, 125 (1-2). pp. 161-167. ISSN 0254-0584 |
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Relation |
http://cgcri.csircentral.net/347/
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