Chemical Synthesis And High Frequency Properties Of Zno,Au@ZnO Nanoparticles

With the development of nanomaterials, some new research directionsemerge in modernphysics, chemistry, biology and other fields, so nanomaterialpreparation, characterization and properties research has attracted many researchers’attention and concern. In this paper, Au nanoparticles, ZnO nanoparticles andAu@ZnO nanoparticles were synthesized by high temperature in oil phase, andstudied the structure and properties of these nanomaterials through avariety of means.The main results are as follows.Through the high temperature in oil phase, prepared monodisperse ZnOnanoparticles, and according to the different reactants molarratio synthesized ZnOnanoparticles with triangle shape and sexangle shape and spherical shape of ZnOnanoparticles. We esearched them characterization of the structure byX-ray diffractionand high resolution transmission electron microscopy, find that the crystals tructure ofsynthesized ZnO nanoparticles are sixsides of the wurtzite structure. We also payattentionto the UV absorption of ZnO nanoparticles, and find that the strongestabsorption peak at369nm. Calculate its band gap, the band gapis about3.36eV. Wefocus on the high frequency characteristics of the ZnO nanoparticles between0.1GHzto10GHz,can’t find the peaks between0.1GHz to10GHz, also calculated thedielectric loss tangent, resonance peak isn’t at this interval.We synthesized Au nanoparticles, and Au@ZnO core-shell structure compositematerials, and researched the characterization of the structure by X-ray diffraction andhigh resolution transmission electron microscopy. Compared the UV absorptioncharacterization of Au nanoparticles and ZnO nanoparticles and Au@ZnO core-shellstructure nanoparticles, We found than the absorption peak of ZnO is blue shifts andthe absorption peak of Au is red shifts. We focus on the high frequency characteristicsof the Au@ZnO nanoparticles between0.1GHz to10GHz. With the increase offrequency the dielectric constant and loss factor ofAu@ZnO nanoparticle are reduced.We compared the frequency characteristics of Au@ZnO nanoparticles and ZnOnanoparticles. The dielectric constant of Au@ZnO composite nanoparticles is lowerthan the ZnO nanoparticles, but the loss factor is higher than the ZnOnanoparticles, and the dielectric loss angletangent in the low frequency is higher thanthe ZnO nanoparticles, and in highfrequency is the same as ZnO nanoparticles. On thewhole Au@ZnO nanoparticles and ZnO nanoparticles have stable dielectriccharacteristics between0.1GHz to10GHz.