Electromagnetic Wave Absorption Properties of Nanoscaled ZnO

摘要: Microwave absorbing material (MAM) is a kind of functional that can absorb electromagnetic wave effectively and convert energy into heat or make disappear by interference (Kimura et al., 2007). MAM currently gaining much attention in the field civil military applications. For example, materials have been widely applied to minimize reflection microwave darkrooms, airplanes, steamboats, tanks so on (Zou 2008). Generally, performance any linked its intrinsic properties (i.e. conductivity, complex permittivity permeability) as well extrinsic such thickness working frequencies. It clear absorption be improved changing above parameters. However, traditional MAMs novel nanomaterials still some disadvantages high density, narrow band, low absorptivity 2006). Therefore, demands for developing more economical with “low wide thin thickness, absorptivity” are ever increasing. Wurtzite-structured ZnO great importance versatile applications optoelectronics, piezoelectricity, absorption, laser, acous-optical divices, sensors, (Wang One-dimensional nanostructures ZnO, nanowires, nanobelts, nanotetrapods, hot research topic nanotechnology their unique potential Moreover, several types three-dimensional synthesized. Because surface/volume ratio integrated platform, oxide networks demonstrated building ultrasensitive highly selective gas sensors optoelectronics (Zhu worth mentioning shown attraction radiation shielding high-frequency range due many chemical physical (Zhuo Some works focused nanoscaled vivid light weight, ratio, semiconductive piezoelectric & Song, On other hand, carbon nanotubes (CNTs) conductive filler studied spiral tubular structure since discovery CNTs Iijima 1991 (Iijima, 1991). CNTs/polymer composites exhibit strong frequency 2-18 GHz application broad