Preparation and Infrared Emissivity of Glucose-based Carbon Coated ZnFeO

To restrain the infrared emission of zinc ferrite in 8-14μm wave band,highly dispersed carbon coated ZnFeO nanocomposites were obtained from glucose solution under hydrothermal conditions,where ZnFeO particles prepared firstly in a simple hydrothermal route was used as the seeds.It was proved to be a core-shell structure of glucose-based carbon coated ZnFeO particles by transmission electron microscope(TEM),fourier transform infrared(FT-IR),and UV-Vis technologies.After heat-treated at 500℃,the carbonization degree of the coating is improved,but the core is still oxide.Whereas the core takes place a carbothermal reduction at 1000℃,it finally yields a structure with a graphite layer coated Fe nanocrystals.The infrared emissivity tests in 8-14μm waveband show that it can be lowered to 0.5 by the glucose-based carbon coating without the heat treatment.After heat-treated at 500℃,it lowers the average infrared emissivity further to 0.353,which will expand the stealth band of zinc ferrite.