Building Materials Effects of Al Content and Physical Properties on the Electromagnetic Interference Shielding of Sn Based Coating Thin Layers

Abstract:

This study coats complex colloid mixed with Sn-xAl powders and polyethylene on glass to examine the shield effect on electromagnetic interference (EMI). In addition, the sputtering specimens and powder coating specimens were compared. The results show that adding Al to the Sn-xAl powders can increase the electromagnetic interference (EMI) shield at lower frequencies. Notably, the number of cavities in the coating layer increased with the coating thickness, with the result that the EMI shield could not improve with an increase in the coating thickness at higher frequencies. However, the EMI shield of sputtering films had a tendency to increase as the thin thickness increased. The Sn-40Al undergoes a dispersing effect which forms a fine overlapping structure, thereby improving the low frequency EMI shielding. In addition, the Sn-20Al powders possessed the properties of a small particle size, closed structure and higher electric conductivity which improved the high frequency EMI shielding. For the sputtering films, the annealed treatment not only had higher electric conductivity but also increased the high frequency EMI shielding.

• Periodical: Applied Mechanics and Materials (Volume 142)
• Pages: 142-151
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.142.142
• Online since: November 2011
• Authors: Fei Shuo Hung, Fei Yi Hung, Che Ming Chiang, Truan Sheng Lui
• Keywords: Coating, Electromagnetic Interference (EMI), Sn-Al, Sputtering

References

[1] C. Polk and E. Postow: Hand Book of Electromagnetic Fields, 2nd Ed., CRC Press Inc., (1996) 212-213.

[2] C. F. Blackman, J. P. Blanchard, S. G. Benane and D. E. House: J. FASEB, 9 (1995) 547-551.

[3] C. F. Blackman, S. G. Benane, J. R. Rabinowitj, D. E. House and W. T. Joines: Bioelectromagnetics, 6 (1985) 327-338.

[4] C. J. Merchant, D. C. Renew, J. Swanson, ; Exposures to Power Frequency Magnetic Field in the Home;, Journal of Radiological Protection, 14 (1994) 77-87.

DOI: 10.1088/0952-4746/14/1/008

[5] B. R. Mcleod and A. R. Liboff: Bioelectromagnetics, 7 (1986) 177-189.

[6] J. M. R. Delgado, J. Leaf, J. L. Monteagudo and M. G. Gracia, J. Anat, 134 (1982) 533-551.

[7] C. M. Chiang and C. M. Lai: A Study on the Comprehensive Indicator of Indoor Environment Assessment for Occupants' Health in Taiwan, Building and Environment, 37(2001) 387-392.

DOI: 10.1016/s0360-1323(01)00034-8

[8] N. Day, J. Skinner, E. Roman and S. G. Allen: The Lancet, 354 (1999) 1925-(1931).

[9] M. Fechting and A. Ahlbom: magnetic fields and cancer in children residing near Swedish High Voltage Power Lines, Am. J. Epidemiol., 138 (1993) 467-481.

DOI: 10.1093/oxfordjournals.aje.a116881

[10] V. Manni, A. Lisi, D. Pozzi, S. Rieti, A. Serafino, L. Giuliani and S. Grimaili: Bioelectromagnetics, 23 (2002) 298-305.

DOI: 10.1002/bem.10023

[11] J. Burnett and Y. Du: Low Frequency Magnetic Interference in High-Rise Buildings, Seventh International IBPSA Conference: Building Simulation (2001) 327-333.

[12] T. S. Tenforde and W. T. Kaune: Health Phys, 53 (1987) 585-606.

[13] N. Wertheimer and E. Leeper: Am. J. Epidemiol., 109 (1979) 273-284.

[14] A. Ubeda, J. Leaf, M. A. Trillo and J. M. R. Delgado: J. Anat., 37 (1982) 513-536.

[15] A. R. Liboff: J. Biolog. Phys., 13 (1985) 99-102.

[16] D. C. Paine, T. Whitson, D. Janiac, R. Beresford and C. Yang: Journal of Applied Physics., 85 (1999)12-15.

[17] D. Liu, D. Suqiao: Asia-Pacific Conference on Environmental Electromagnetics., (2000) 326-332.

[18] J. L. Vossen: Transparent Conducting Films, Physics Thin Films, 9 (1997) 1-71.

[19] R. M. Gresham: Plating and Surface finishing, (1998) 63-69.

[20] C. S. Zhang, Q. Q. Ni, S. Y. Fu and K. Kurshiki: Composites Science and Technology, 67(14), (2007) 2793-2980.

[21] T. Wang, G. Chen, C. Wu and D. Wu: Progress in Organic Coatings, 59(2), (2007)101-105.

[22] K. Wenderoth and J. petermann: Polymer Composites, 10 (1992) 52-56.

[23] W. W. Salisbury, Absorbent Body for Electromagnetic Waves: U. S. Patent no. 259994410. (1952).

[24] R. L. Fante and M. T. McCormack: IEEE Trans. Antenna Propagation, 36 (1998) 1443-1454.

[25] J. C. Liu, S. S. Ho and S. S. Bor: IEEE Proceeding-H, 140 (1993) 414-416.

[26] E. G. Han, E. A. Kim and K. W. Oh: Synthetic Metals, 123 (3), 2001, 469-476.

[27] White, George E., Liquid crystalline polymer and multilayer polymer-based passive signal processing components for rf / wireless multi-band applications: U. S. Patent no. 20070085108 (2007).

[28] http: /www. matter-antimatter. com/periodic_table. htm.

[29] F. Y. Hung, T. S. Lui, H. C. Liao: Applied Surface Science, 253 (2007) 7443-7448.

[30] C. T. Lin, production of PT/PZT/PLZT thin films, powders and laser direct write patterns, U. S. Patent no. 5188902 (1993).