Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance

Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance

Co@C core–shell nanospheres highly dispersed on carbon supports were rationally designed to improve the microwave absorbing property of the composite material, and fabricated by one pot thermal decomposition and simple annealing process. The Co nanospheres were completely encapsulated with thin carb...

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Main Authors: Rambabu Kuchi, Monika Sharma, Sung Woo Lee, Dongsoo Kim, Namgee Jung, Jong-Ryul Jeong
Format: Article
Language:English
Published: Elsevier 2019-02-01
Series:Progress in Natural Science: Materials International
Online Access:http://www.sciencedirect.com/science/article/pii/S1002007119301881
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spelling doaj-c4eced091991409e950909f228ddd25f2020-11-25T02:33:59ZengElsevierProgress in Natural Science: Materials International1002-00712019-02-012918893Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performanceRambabu Kuchi0Monika Sharma1Sung Woo Lee2Dongsoo Kim3Namgee Jung4Jong-Ryul Jeong5Department of Materials Science and Engineering, Graduate School of Energy Science and Technology, Chungnam National University, Daejeon, 34134, Republic of Korea; Department of Engineering Chemistry, SRKR Engineering College, Chinna Amiram, Bhimavaram, 534204, India; Convergence Research Center for Development of Mineral Resources, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea; Powder and Ceramics Division, Korea Institute of Materials Science, Changwon, Gyeongnam, 51508, Republic of KoreaGraduate School of Energy Science and Technology, Chungnam National University, Daejeon, 34134, Republic of KoreaDepartment of Materials Science and Engineering, Graduate School of Energy Science and Technology, Chungnam National University, Daejeon, 34134, Republic of KoreaConvergence Research Center for Development of Mineral Resources, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea; Powder and Ceramics Division, Korea Institute of Materials Science, Changwon, Gyeongnam, 51508, Republic of KoreaGraduate School of Energy Science and Technology, Chungnam National University, Daejeon, 34134, Republic of Korea; Corresponding author.Department of Materials Science and Engineering, Graduate School of Energy Science and Technology, Chungnam National University, Daejeon, 34134, Republic of Korea; Corresponding author.Co@C core–shell nanospheres highly dispersed on carbon supports were rationally designed to improve the microwave absorbing property of the composite material, and fabricated by one pot thermal decomposition and simple annealing process. The Co nanospheres were completely encapsulated with thin carbon shells, which can effectively prevent the oxidation of the Co surface. Additionally, the particle size of Co nanospheres were properly controlled to optimize the electromagnetic property of the composite material. As a result, the lightweight Co@C/C composites with the particle size of 20 nm exhibited much enhanced microwave absorption properties. The improved microwave absorption performance is attributed mainly to the enhanced isotropic ratio and impedance matching of magnetic composites via tuning the Co particle size. Therefore, the well-designed core-shell Co@C composite structure will provide a new insight for the development of high performance microwave absorbers. Keywords: Co@C/C composites, Thermal decomposition, Nanoscale size, Impedance matching, Microwave absorptionhttp://www.sciencedirect.com/science/article/pii/S1002007119301881
collection DOAJ
language English
format Article
sources DOAJ
author Rambabu Kuchi
Monika Sharma
Sung Woo Lee
Dongsoo Kim
Namgee Jung
Jong-Ryul Jeong
spellingShingle Rambabu Kuchi
Monika Sharma
Sung Woo Lee
Dongsoo Kim
Namgee Jung
Jong-Ryul Jeong
Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance
Progress in Natural Science: Materials International
author_facet Rambabu Kuchi
Monika Sharma
Sung Woo Lee
Dongsoo Kim
Namgee Jung
Jong-Ryul Jeong
author_sort Rambabu Kuchi
title Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance
title_short Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance
title_full Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance
title_fullStr Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance
title_full_unstemmed Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance
title_sort rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance
publisher Elsevier
series Progress in Natural Science: Materials International
issn 1002-0071
publishDate 2019-02-01
description Co@C core–shell nanospheres highly dispersed on carbon supports were rationally designed to improve the microwave absorbing property of the composite material, and fabricated by one pot thermal decomposition and simple annealing process. The Co nanospheres were completely encapsulated with thin carbon shells, which can effectively prevent the oxidation of the Co surface. Additionally, the particle size of Co nanospheres were properly controlled to optimize the electromagnetic property of the composite material. As a result, the lightweight Co@C/C composites with the particle size of 20 nm exhibited much enhanced microwave absorption properties. The improved microwave absorption performance is attributed mainly to the enhanced isotropic ratio and impedance matching of magnetic composites via tuning the Co particle size. Therefore, the well-designed core-shell Co@C composite structure will provide a new insight for the development of high performance microwave absorbers. Keywords: Co@C/C composites, Thermal decomposition, Nanoscale size, Impedance matching, Microwave absorption
url http://www.sciencedirect.com/science/article/pii/S1002007119301881
work_keys_str_mv AT rambabukuchi rationaldesignofcarbonshellencapsulatedcobaltnanospherestoenhancemicrowaveabsorptionperformance
AT monikasharma rationaldesignofcarbonshellencapsulatedcobaltnanospherestoenhancemicrowaveabsorptionperformance
AT sungwoolee rationaldesignofcarbonshellencapsulatedcobaltnanospherestoenhancemicrowaveabsorptionperformance
AT dongsookim rationaldesignofcarbonshellencapsulatedcobaltnanospherestoenhancemicrowaveabsorptionperformance
AT namgeejung rationaldesignofcarbonshellencapsulatedcobaltnanospherestoenhancemicrowaveabsorptionperformance
AT jongryuljeong rationaldesignofcarbonshellencapsulatedcobaltnanospherestoenhancemicrowaveabsorptionperformance
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