Nonstationary thermophysical characterization of exfoliated graphite with carbon nanotubes composites
The sheet samples of thermally exfoliated graphite (TEG)–carbon nanotubes (CNT) composites (TEG-CNT-cs) were obtained by persulphate oxidation using chemical (CO) and electrochemical (anode) oxidation (ECAO). Electron microscopy reveals multi-layered structures of few-layer graphene nanosheets with...
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| Veröffentlicht in: | Low temperature physics (Woodbury, N.Y.) N.Y.), 2023-05, Vol.49 (5), p.553-567 |
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| container_title | Low temperature physics (Woodbury, N.Y.) |
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| creator | Morozovsky, N. V. Barabash, Yu. M. Grebelna, Yu. V. Kartel, M. T. Sementsov, Yu. I. Dovbeshko, G. I. |
| description | The sheet samples of thermally exfoliated graphite (TEG)–carbon nanotubes (CNT) composites (TEG-CNT-cs) were obtained by persulphate oxidation using chemical (CO) and electrochemical (anode) oxidation (ECAO). Electron microscopy reveals multi-layered structures of few-layer graphene nanosheets with folded and tubular-like fragments. The effective thermal diffusivity values were estimated by nonstationary photo-pyroelectric thermophysical characterization using the heat pulse and thermowave modulation methods. Comparison with other carbon (C-) based thermal management materials shows that TEG-CNT-cs exhibit thermal diffusivity, effusivity, and conductivity comparable with those of actual C–polymer- and C–C-composites. For TEG-CNT-cs, evaluated values of phonon mean free path (MFP) and relaxation time (RT) are in the ranges estimated for defective graphene. The values of diffusivity and effusivity, MFP, and RT are lower for denser TEG-CNT-cs obtained by ECAO and are higher for less dense TEG-CNT-cs obtained by CO. The obtained diffusivity and effusivity values designate TEG-CNT-cs as suitable thermal management materials. |
| doi_str_mv | 10.1063/10.0017817 |
| format | Article |
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V. ; Barabash, Yu. M. ; Grebelna, Yu. V. ; Kartel, M. T. ; Sementsov, Yu. I. ; Dovbeshko, G. I.</creator><creatorcontrib>Morozovsky, N. V. ; Barabash, Yu. M. ; Grebelna, Yu. V. ; Kartel, M. T. ; Sementsov, Yu. I. ; Dovbeshko, G. I.</creatorcontrib><description>The sheet samples of thermally exfoliated graphite (TEG)–carbon nanotubes (CNT) composites (TEG-CNT-cs) were obtained by persulphate oxidation using chemical (CO) and electrochemical (anode) oxidation (ECAO). Electron microscopy reveals multi-layered structures of few-layer graphene nanosheets with folded and tubular-like fragments. The effective thermal diffusivity values were estimated by nonstationary photo-pyroelectric thermophysical characterization using the heat pulse and thermowave modulation methods. Comparison with other carbon (C-) based thermal management materials shows that TEG-CNT-cs exhibit thermal diffusivity, effusivity, and conductivity comparable with those of actual C–polymer- and C–C-composites. For TEG-CNT-cs, evaluated values of phonon mean free path (MFP) and relaxation time (RT) are in the ranges estimated for defective graphene. The values of diffusivity and effusivity, MFP, and RT are lower for denser TEG-CNT-cs obtained by ECAO and are higher for less dense TEG-CNT-cs obtained by CO. The obtained diffusivity and effusivity values designate TEG-CNT-cs as suitable thermal management materials.</description><identifier>ISSN: 1063-777X</identifier><identifier>EISSN: 1090-6517</identifier><identifier>DOI: 10.1063/10.0017817</identifier><identifier>CODEN: LTPHEG</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Anodizing ; Carbon nanotubes ; Composite materials ; Diffusivity ; Graphene ; Graphite ; Heat pulses ; Multilayers ; Oxidation ; Relaxation time ; Thermal diffusivity ; Thermal management ; Thermophysical properties</subject><ispartof>Low temperature physics (Woodbury, N.Y.), 2023-05, Vol.49 (5), p.553-567</ispartof><rights>Author(s)</rights><rights>2023 Author(s). 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Comparison with other carbon (C-) based thermal management materials shows that TEG-CNT-cs exhibit thermal diffusivity, effusivity, and conductivity comparable with those of actual C–polymer- and C–C-composites. For TEG-CNT-cs, evaluated values of phonon mean free path (MFP) and relaxation time (RT) are in the ranges estimated for defective graphene. The values of diffusivity and effusivity, MFP, and RT are lower for denser TEG-CNT-cs obtained by ECAO and are higher for less dense TEG-CNT-cs obtained by CO. 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I.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Nonstationary thermophysical characterization of exfoliated graphite with carbon nanotubes composites</atitle><jtitle>Low temperature physics (Woodbury, N.Y.)</jtitle><date>2023-05-01</date><risdate>2023</risdate><volume>49</volume><issue>5</issue><spage>553</spage><epage>567</epage><pages>553-567</pages><issn>1063-777X</issn><eissn>1090-6517</eissn><coden>LTPHEG</coden><abstract>The sheet samples of thermally exfoliated graphite (TEG)–carbon nanotubes (CNT) composites (TEG-CNT-cs) were obtained by persulphate oxidation using chemical (CO) and electrochemical (anode) oxidation (ECAO). Electron microscopy reveals multi-layered structures of few-layer graphene nanosheets with folded and tubular-like fragments. The effective thermal diffusivity values were estimated by nonstationary photo-pyroelectric thermophysical characterization using the heat pulse and thermowave modulation methods. Comparison with other carbon (C-) based thermal management materials shows that TEG-CNT-cs exhibit thermal diffusivity, effusivity, and conductivity comparable with those of actual C–polymer- and C–C-composites. For TEG-CNT-cs, evaluated values of phonon mean free path (MFP) and relaxation time (RT) are in the ranges estimated for defective graphene. The values of diffusivity and effusivity, MFP, and RT are lower for denser TEG-CNT-cs obtained by ECAO and are higher for less dense TEG-CNT-cs obtained by CO. 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| subjects | Anodizing Carbon nanotubes Composite materials Diffusivity Graphene Graphite Heat pulses Multilayers Oxidation Relaxation time Thermal diffusivity Thermal management Thermophysical properties |
| title | Nonstationary thermophysical characterization of exfoliated graphite with carbon nanotubes composites |
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