Carbon letters

  • Volume 27
  • /
  • Pages.90-97
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  • 2018
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  • 1976-4251(pISSN)
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  • 2233-4998(eISSN)
Korean Carbon Society (한국탄소학회)
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Detection of electromagnetic interference shielding effect of Hanji mixed with carbon nanotubes using nuclear magnetic resonance techniques

  • Byun, Young Seok (Western Seoul Center, Korea Basic Science Institute) ;
  • Chae, Shin Ae (Western Seoul Center, Korea Basic Science Institute) ;
  • Park, Geun Yeong (Department of Carbon and Advanced Nanomaterials Engineering, Jeonju University) ;
  • Lee, Haeseong (Department of Carbon and Advanced Nanomaterials Engineering, Jeonju University) ;
  • Han, Oc Hee (Western Seoul Center, Korea Basic Science Institute)
  • Received : 2017.11.12
  • Accepted : 2017.12.30
  • Published : 2018.07.31
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Abstract

Electromagnetic interference (EMI) shielding is an important issue in modern daily life due to the increasing prevalence of electronic devices and their compact design. This study estimated EMI-shielding effect (EMI-SE) of small ($8-14{\times}17mm$) Hanji (Korean traditional paper) doped with carbon nanotubes (CNTs) and compared to Hanji without CNT using $^2H$ (92.1 MHz) and $^{23}Na$ (158.7 MHz) nuclear magnetic resonance (NMR) peak area data obtained from 1 M NaCl in $D_2O$ samples in capillary tubes that were wrapped in the Hanji samples. The simpler method of using the variation of reflected power and tuning frequency by inserting the sample into an NMR coil was also tested at 242.9, 158.7, and 92.1 MHz. Overall, EMI shielding was relatively more effective at the higher frequencies. Our results validated that NMR methods to be useful to evaluate EMI-SE, particularly for small, flexible shielding materials, and demonstrated that EMI shielding by absorption is dominant in Hanji mixed with CNT.

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References

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