金颗粒对单层WS2三角片光学性质的影响

Monolayer WS2 nanomaterials have many excellent physical properties including unique opto-electronic properties, the valley polarization effect, the spin-orbit split, and so on. Focus on the influence of Au on the optical properties of WS2, monolayer WS2 and WS2/Au composites were fabricated by chemical vapor deposition and sputtering method, respectively. The results of scanning electron microscopy exhibit that the as-prepared WS2 and WS2/Au composites are all equilateral triangular flakes. The frequency difference between inner and outer vibration modes in the Raman spectrum indicated that the WS2 is monolayer film. Comparing the optical properties of the monolayer WS2 and the WS2/Au composites, we found that the photoluminescence of WS2 is quenched, but the outer vibrations can be enhanced in the Raman spectra.