杂原子
石墨烯
材料科学
纳米复合材料
兴奋剂
带隙
氧化物
剥脱关节
碳纤维
X射线光电子能谱
分析化学(期刊)
纳米技术
硫黄
化学工程
光电子学
复合材料
复合数
化学
有机化学
冶金
工程类
戒指(化学)
作者
Bingxin Mao,Chen Liang,Jian Li,Wenyue Dong,Xu Cui,Qian Duan
标识
DOI:10.1016/j.optlastec.2023.109469
摘要
A series of carbon dot graphene oxide (CDGO) nanocomposites and heteroatom doped-carbon dot graphene oxide (HD-CDGO) nanocomposites were prepared by one-step electrochemical exfoliation methods, where heteroatom represents P, N and S atoms. TEM, FT-IR and XPS were performed to confirm the structure of HD-CDGO. The Z-scan tests were used to investigate the nonlinear optical (NLO) properties of HD-CDGO, and the estimation of the band gap was performed using UV–vis and Tauc plots. The results demonstrate that the energy gaps of the prepared HD-CDGO were reduced, and the NLO properties were improved compared with those of CDGO. The nonlinear absorption coefficient (βeff) of S-CDGO is 9.3 times higher than that of CDGO, and the imaginary part of the third-order nonlinear susceptibility (Im χ(3)) increases from 23 × 10-12 esu to 213 × 10-12 esu. Furthermore, different sulfur element concentration doped CDGO (Sx-CDGO, x = 0.05, 0.10, 0.20, 0.40, S0.10-CDGO equals S-CDGO) were prepared, and the energy gap of Sx-CDGO decreases from 4.5 eV to 2.5 eV as the surface sulfur atomic concentration of Sx-CDGO increases from 0.6 % to 1.8 %, the βeff value of Sx-CDGO increases from 15 × 10-10 to 65 × 10-10 m/W. Moreover, HD-CDGO/polymethyl methacrylate (HD-CDGO/PMMA) composites were prepared for practical applications. S-CDGO/PMMA composites exhibit the best NLO property, with the initial threshold value and limiting threshold of 0.05 and 0.40 J cm−2, respectively, and the minimum transmittance of 21 %. Our work provides a promising design strategy to synthesize high-performance optical limiting (OL) materials.
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