Electromagnetic interference shielding properties of carbon nanotube buckypaper composites.
Preformed carbon nanotube thin films (10-20 microm), or buckypapers (BPs), consist of dense and entangled nanotube networks, which demonstrate high electrical conductivity and provide potential lightweight electromagnetic interference (EMI) solutions for composite structures. Nanocomposite laminates consisting of various proportions of single-walled and multi-walled carbon nanotubes, having different conductivity, and with different stacking structures, were studied. Single-layer BP composites showed shielding effectiveness (SE) of 20-60 dB, depending on the BP conductivity within a 2-18 GHz frequency range. The effects on EMI SE performance of composite laminate structures made with BPs of different conductivity values and epoxy or polyethylene insulating layer stacking sequences were studied. The results were also compared against the predictions from a modified EMI SE model. The predicted trends of SE value and frequency dependence were consistent with the experimental results, revealing that adjusting the number of BP layers and appropriate arrangement of the BP conducting layers and insulators can increase the EMI SE from 45 dB to close to 100 dB owing to the utilization of the double-shielding effect.
Park
Jin Gyu
JG
High-Performance Materials Institute, Florida State University, Tallahassee, FL 32310, USA. parkji@eng.fsu.edu
Louis
Jeffrey
J
Cheng
Qunfeng
Q
Bao
Jianwen
J
Smithyman
Jesse
J
Liang
Richard
R
Wang
Ben
B
Zhang
Chuck
C
Brooks
James S
JS
Kramer
Leslie
L
Fanchasis
Percy
P
Dorough
David
D
D004563:Electrochemistry / Q000379:methods*; D004574:Electromagnetic Fields; D053761:Nanocomposites / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*
D037742:Nanotubes, Carbon