Electromagnetic and microwave absorbing properties of multi-walled carbon nanotubes/polymer composites

✍ Scribed by Zhuangjun Fan; Guohua Luo; Zengfu Zhang; Li Zhou; Fei Wei

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 477 KB
• Volume: 132
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2006.02.045

✦ Synopsis

The preparation and characterization of CNTs/polymer (PET, PP, PE and varnish) composites were studied for microwave absorption applications in the range of 2–18GHz. The results indicated the position of reflectivity peak moves to a lower frequency and the loss factors of composites increase with increasing CNTs concentrations. When CNTs concentration was above 4wt%, there was a sharp increase of loss tangent. 4wt% CNTs/PET and 8wt% CNTs/varnish composites had considerable absorbing peak at 7.6GHz, 15.3GHz and achieved maximum absorbing value of 17.61dB, 24.27dB, respectively. In addition, the frequencies range for absorbing values exceeding 5dB of CNTs/(PET, PP, varnish) composites are 13GHz, 10GHz and 6GHz, respectively. The microwave absorption of CNTs composites can be mainly attributed to the dielectric loss rather than magnetic loss.