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利用原位聚合方法将聚苯乙烯(PS)共价接枝到二硫化钼纳米片表面,获得的材料MoS_2-PS能均匀地分散在常见的有机溶剂中。开孔Z-扫描实验结果表明:与MoS_2、MoS_2/PS相比,MoS_2-PS的N,N-二甲基甲酰胺(DMF)溶液及其聚甲基丙烯酸甲酯(PMMA)薄膜样品均表现出更好的非线性光学性能。相对于溶液,在532nm和1 064nm激光激发时,MoS_2-PS/PMMA固体薄膜表现出最大的非线性吸收系数(β_(eff)),分别达到407.70cm/GW(MoS_2-PMMA:100.69cm/GW;MoS_2/PS/PMMA:116.55cm/GW)和429.64cm/GW(比较:MoS_2-PMMA:-48.92cm/GW;MoS_2/PS/PMMA:66.31cm/GW);相应的光限幅阈值分别为0.92GW/cm~2(532nm)和1.12GW/cm~2(1 064nm)。MoS_2-PS/PMMA固体薄膜经200℃退火处理后,其非线性吸收系数和光限幅性能得到增强(β_(eff)系数分别为455.67cm/GW和448.90cm/GW;光限幅阈值分别为1.07GW/cm~2和0.87GW/cm~2)。
Polystyrene (PS) was covalently grafted onto the surface of molybdenum disulfide nanosheets by in-situ polymerization. The obtained MoS 2 -PS can be uniformly dispersed in common organic solvents. The results of Z-scan of open pores show that compared with MoS_2 and MoS_2 / PS, the N, N-dimethylformamide (DMF) solution of MoS_2-PS and its polymethylmethacrylate (PMMA) Out of better non-linear optical performance. The MoS_2-PS / PMMA solid films exhibited the largest nonlinear absorption coefficient (β eff) of 407.70 cm / GW (MoS 2 -PMMA: 100.69 cm / GW, respectively) at 532 nm and 1 064 nm laser excitation ; MoS_2 / PS / PMMA: 116.55cm / GW) and 429.64cm / GW (comparison: MoS_2-PMMA: -48.92cm / GW; MoS_2 / PS / PMMA: 66.31cm / GW). The corresponding optical limiting thresholds were 0.92 GW / cm ~ 2 (532 nm) and 1.12 GW / cm ~ 2 (1064 nm). The non-linear absorption coefficient and optical limiting properties of MoS_2-PS / PMMA solid films annealed at 200 ℃ are 455.67cm / GW and 448.90cm / GW, respectively. The optical limiting thresholds are 1.07 GW / cm ~ 2 and 0.87 GW / cm ~ 2).