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CARBONLETT, vol. 27, no. 1, pp.90-97, 2018

DOI: http://dx.doi.org/ DOI:10.5714/CL.2018.27.090

Detection of electromagnetic interference shielding effect of Hanji mixed with carbon nanotubes using nuclear magnetic resonance techniques

Young Seok Byun1,2, Shin Ae Chae1, Geun Yeong Park3, Haeseong Lee3,♠ and Oc Hee Han1,2,4,♠

Affiliation: 1Western Seoul Center, Korea Basic Science Institute, Seoul 03759, Korea
2Graduate School of Analytical Science & Technology, Chungnam National University, Daejeon 34134, Korea
3Department of Carbon and Advanced Nanomaterials Engineering, Jeonju University, Jeonju 55069, Korea
4Department of Chemistry & Nano Science, Ewha Womans University, Seoul 03760, Korea

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 (8-14×17 mm) Hanji (Korean traditional paper) doped with carbon nanotubes (CNTs) and compared to Hanji without CNT using 2H (92.1 MHz) and 23Na (158.7 MHz) nuclear magnetic resonance (NMR) peak area data obtained from 1 M NaCl in D2O 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.

Keyword: carbon nanotubes, electromagnetic interference shielding, nuclear magnetic resonance spectroscopy, Hanji