Radio-frequency characterization of multi-walled carbon nanotube/poly-lactic acid composites

作     者：Nuttaya Sukgorn Krisana Siraleartmukul Visittapong Yordsri Nonchanutt Chudpooti Sarawuth Chaimool Prayoot Akkaraekthalin Suramate Chalermwisutkul Chanchana Thanachayanont Winadda Wongwiriyapan Khattiya Chalapat 

作者机构：College of Nanotechnology King Mongkut’s Institute of Technology Ladkrabang Bangkok 10520 Thailand Metallurgy and Materials Science Research Institute Chulalongkorn University Bangkok 10330 Thailand National Metal and Materials Technology Center Pathunthani12120 Thailand Department of Electrical and Computer Engineering King Mongkut's University of Technology North BangkokBangkok 10800 Thailand International Thai-German Graduate School of Engineering King Mongkut's University of Technology North Bangkok Bangkok 10800 Thailand Thailand Center of Excellence in Physics CHE Bangkok 10400 Thailand Nanotec-KMITL Center of Excellence on Nanoelectronics Device Bangkok 10520 Thailand 

出 版 物：《Materials Today: Proceedings》 

年 卷 期：2017年第4卷第5期

页      面：6548-6552页

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：Carbon Nanotube Electrical Permittivity Poly-Lactic Acid Radio-Frequency Characterization 

摘      要：Nowadays radio and microwave frequencies are widely used in wireless broadcastings and communications. But these waves can cause electromagnetic interferences in some electronic devices, including the equipment used in hospitals. The problems of the electromagnetic interference can be solved by using the materials that can reflect and/or absorb radio-frequency (RF) and microwaves. The shielding effectiveness (SE) of a material depends on its conductivity and the electrical permittivity. Recently, carbon nanotubes (CNTs) have been proposed as promising materials for shielding applications owing to its flexibility, durability, lightweight and exceptional electrical conductivity compared to conventional metal. In this work, the RF properties of multi-walled carbon nanotube (MWCNT) composites were investigated. Poly-lactic acid (PLA), a natural bio-degradable material, is used as the polymer matrix. The composites with different MWCNT concentrations (0 to 0.4 wt%) were prepared and molded into thin rectangular samples (5.6 cm x 6.3cm). The surfaces of the composites were morphologically characterized by a scanning electron microscope. The electrical permittivity of the samples was measured by using a vector network analyzer and a microstrip resonator within a range of 1–11 GHz. The effects of MWCNT concentration on electrical permittivity will be discussed.