Large-area reduced graphene oxide thin film with excellent thermal conductivity and electromagnetic interference shielding effectiveness

Pradip Kumar, Faisal Shahzad, Seunggun Yu, Soon Man Hong, Yoon Hyun Kim, Chong Min Koo

Research output: Contribution to journalArticle

160 Citations (Scopus)

Abstract

In this work, we fabricated reduced large-area graphene oxide (rLGO) with maximum surface area of 1592 μm2 through a cost-effective chemical reduction process at low temperature. The product revealed large electrical conductivity of 243 ± 12 S cm-1 and thermal conductivity of 1390 ± 65 W m-1 K-1, values much superior to those of a conventional reduced small-area graphene oxide (with electrical conductivity of 152 ± 7.5 S cm-1 and thermal conductivity of 900 ± 45 W m-1 K-1). The rLGO thin film also exhibited not only excellent stiffness and flexibility with Young's modulus of 6.3 GPa and tensile strength of 77.7 MPa, but also an efficient electromagnetic interference (EMI) shielding effectiveness of ∼20 dB at 1 GHz. The excellent performance of rLGO is attributed to the fact that the larger area LGO sheets include much fewer defects that are mostly caused by the damage of graphene sp2 structure around edge boundaries, resulting in large electrical conductivity. The manufacturing process of rLGO is an economical and facile approach for the large scale production of highly thermally conducting graphene thin films with efficient EMI shielding properties, greatly desirable for future portable electronic devices.

Original languageEnglish
Pages (from-to)494-500
Number of pages7
JournalCarbon
Volume94
DOIs
Publication statusPublished - 2015 Aug 29
Externally publishedYes

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Graphite
Signal interference
Shielding
Graphene
Oxide films
Thermal conductivity
Thin films
Oxides
Tensile strength
Elastic moduli
Stiffness
Defects
Electric Conductivity
Costs

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Cite this

Large-area reduced graphene oxide thin film with excellent thermal conductivity and electromagnetic interference shielding effectiveness. / Kumar, Pradip; Shahzad, Faisal; Yu, Seunggun; Hong, Soon Man; Kim, Yoon Hyun; Koo, Chong Min.

In: Carbon, Vol. 94, 29.08.2015, p. 494-500.

Research output: Contribution to journalArticle

Kumar, Pradip ; Shahzad, Faisal ; Yu, Seunggun ; Hong, Soon Man ; Kim, Yoon Hyun ; Koo, Chong Min. / Large-area reduced graphene oxide thin film with excellent thermal conductivity and electromagnetic interference shielding effectiveness. In: Carbon. 2015 ; Vol. 94. pp. 494-500.
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