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首页> 外文期刊>RSC Advances >Surfactant-dependant thermally induced nonlinear optical properties of l-ascorbic acid-stabilized colloidal GNPs and GNP-PVP thin films
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Surfactant-dependant thermally induced nonlinear optical properties of l-ascorbic acid-stabilized colloidal GNPs and GNP-PVP thin films

机译：表面活性剂依赖性热诱导的L-抗坏血酸稳定的胶体GNPS和GNP-PVP薄膜的非线性光学性能

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摘要

Gold nanoparticle (GNP) colloids stabilized with various concentrations of l-ascorbic acid were synthesized by the chemical reduction method and characterized by UV-Vis spectroscopy, XRD, FT-IR spectroscopy and TEM. XRD and TEM studies confirmed the reduction in particle size with the stabilizer concentration. UV-Vis spectra showed a blue shift in the LSPR peak. FT-IR peaks ascertained the strong encapsulation of GNPs with l-ascorbic acid functional groups. The nonlinear optical (NLO) properties of colloidal GNPs and GNP-PVP composite thin film were investigated using the Z-scan technique with CW laser excitation at 632.8 nm. The effects of stabilizer concentrations on nonlinear refractive index (n(2)), nonlinear absorption coefficient () and third-order susceptibility (((3))) of colloidal GNPs and GNP-PVP composite thin films were investigated. The values of the NLO parameters for the thin films were as large as n(2) = 10(-5) cm(2) W-1, = 10(-5) cm W-1 and (3)eff = 10(-5) esu. For colloidal GNPs, these parameters were n(2) = 10(-6) cm(2) W-1, = 10(-6) cm W-1 and (3)eff = 10(-7) esu. In both these cases, the NLO parameter values were found to decrease as the stabilizer concentration increased from 1 to 5 mM. The considerable enhancement in the NLO parameters may be attributed to the thermal lensing effect originating from the thermo-optic phenomenon. From the results, the influence of the concentration of the stabilizer on the NLO properties is obvious.
机译：通过化学还原方法合成了用各种浓度的L-抗坏血酸稳定的金纳米粒子（GNP）胶体，并通过UV-Vis光谱，XRD，FT-IR光谱和TEM表征。 XRD和TEM研究证实了粒度降低了稳定剂浓度。 UV-Vis光谱显示LSPR峰值的蓝色偏移。 FT-IR峰确定具有L-抗坏血酸官能团的强封装GNP。使用CW激光激发为632.8nm，研究了胶体GNPS和GNP-PVP复合薄膜的非线性光学（NLO）性质。研究了稳定剂浓度对非线性折射率（N（2）），非线性吸收系数（）和三阶敏感性（（（3）））的影响，得到了胶体GNP和GNP-PVP复合薄膜的影响。薄膜的NLO参数的值大于N（2）= 10（-5）cm（2）W-1，= 10（-5）cm w-1和（3）eff = 10（ -5）esu。对于胶体GNP，这些参数是N（2）= 10（-6）cm（2）W-1，= 10（-6 )cm W-1和（3）Eff = 10（-7）ESU。在这两种情况下，发现NLO参数值随着稳定剂浓度从1至5mm增加而降低。 NLO参数中的相当大的增强可以归因于源自热视光现象的热透镜效果。从结果中，稳定剂浓度对NLO性质的影响是显而易见的。

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  • 来源
    《RSC Advances》 |2019年第27期|共11页
  • 作者

    Sunatkari A. L.; Talwatkar S. S.; Tamgadge Y. S.; Muley G. G.;

  • 作者单位

    Siddhartha Coll Arts Sci &

    Commerce Dept Phys Mumbai 400001 Maharashtra India;

    NG Aacharya &

    DK Maratha Coll Arts Sci &

    Commerce Dept Phys Mumbai 400071 Maharashtra India;

    Mahatma Phule Arts Commerce &

    SC Sci Coll Dept Phys Warud 444906 India;

    St Gadge Baba Amravati Univ Dept Phys Amravati 444602 India;

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  • 正文语种 eng
  • 中图分类 化学;
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