中子辐照对多层二硫化钨纳米片微观结构与光学性能的调控效应研究OA

In this study,neutron irradiation technology with an energy of 14 MeV and a fluence of 1×1014 cm-² was used to treat multilayer tungsten disulfide(WS₂)nanosheets on sapphire substrates.The changes in the microstructure,morphology,and optical properties of the material before and after irradiation were systematically analyzed through various characterization methods.The results showed that after neutron irradiation,the intensity of some Raman modes of the multilayer WS₂ nanosheets decreased with a blue shift,which was attributed to the synergistic effect of shortened W-S bonds caused by in-plane lattice contraction and weakened interlayer phonon coupling.During the irradiation process,the accumulation of Frenkel defects inside the material increases,and the interlayer stress induced by the mutual repulsion of interstitial atoms was alleviated,leading to changes in the original uniform triangular morphology of the nanosheets.In addition,the number of layers of the WS₂ nanosheets decreased from 18 to 4,and the interlayer spacing increased from 0.633 nm to 0.697 nm.UV-visible spectroscopy indicates that the visible light absorption of the irradiated sample is enhanced,and the A-exciton peak undergoes a blue shift,suggesting that the lattice distortion caused by defects widens the optical band gap to 1.96 eV.This study provides a basis for the radiation-resistant design of WS₂ devices and lays a research foundation for regulating the properties of tungsten disulfide.