Research on Infrared Emissivity and Laser Reflectivity of Sn1−xErxO2 Micro/Nanofibers Based on First-Principles

Abstract

Sn 1−x Er x O 2 (x = 0%, 8%, 16%, 24%) micro/nanofibers were prepared by electrospinning combined with heat treatment using erbium nitrate, stannous chloride and polyvinylpyrrolidone (PVP) as raw materials. The target products were characterized by thermogravimetric analyzer, X-ray diffrotometer, fourier transform infrared spectrometer, scanning electron microscope, spectrophotometer and infrared emissivity tester, and the effects of Er 3+ doping on its infrared and laser emissivity were studied. At the same time, the Sn 1−x Er x O 2 (x = 0%, 16%) doping models were constructed based on the first principles of density functional theory, and the related optoelectronic properties such as their energy band structure, density of states, reflectivity and dielectric constant were analyzed, and further explained the mechanism of Er 3+ doping on SnO 2 infrared emissivity and laser absorption from the point of electronic structure. The results showed that after calcination at 600°C, single rutile type SnO 2 was formed, and the crystal structure was not changed by doping Er 3+ . The calcined products showed good fiber morphology, and the average fiber diameter was 402 nm. The infrared emissivity and resistivity of the samples both decreased first and then increased with the increase of Er 3+ doping amount. When x = 16%, the infrared emissivity of the sample was at least 0.71; and Er 3+ doping can effectively reduce the reflectivity of SnO 2 at 1.06 μm and 1.55 μm, when x = 16%, its reflectivity at 1.06 μm and 1.55 μm are 50.5% and 40%, respectively, when x = 24%, the reflectivity at 1.06 μm and 1.55 μm wavelengths are 47.3% and 42.1%, respectively. At the same time, the change of carrier concentration and electron transition before and after Er 3+ doping were described by firstprinciple calculation, and the regulation mechanism of infrared emissivity and laser reflectivity was explained. This study provides a certain experimental and theoretical basis for the development of a single-type, light-weight and easily prepared infrared and laser compatible-stealth material.