| Metallic nanoparticles composite materials not only show application value in the fields such as nanotechnology,biological sciences,and catalysis,but also have become a research hot spot in nonlinear optical field due to their excellent linear and nonlinear optical characteristics.Especially bulk nanocomposites with good transparency have attractive prospect in the aspect of nonlinear optical devices.Herein,a series of Au nanoparticles,metal oxides,and bimetallic nanoparticles containing sodium borosilicate?NBS?glasses were prepared by combining the sol-gel process and redox atmosphere control route.These nano glass composite materials were characterized and analyzed,specific studies are as follows:1.Gold nanoparticles?Au NPs?doped monolithic and transparent NBS glass has been synthesized by both sol-gel and atmosphere control heat treatment methods.Fourier transform infrared?FTIR?spectra in the wavenumber range of 400 to 4000 cm-1 was applied to collect variation information of surface groups of the samples in the sintering process.The microstructure of Au NPs in the glass was characterized by means of X-ray powder diffractionmeter?XRD?and transmission electron microscopy?TEM?.Meanwhile,the third-order nonlinear optical properties of the glass were investigated by using Z-scan technique at the wavelength of 800 nm,pulse duration of 190 fs,and repetition rate of 20 Hz.The glass showed saturable absorption and self-focusing nonlinear refraction,and the optical nonlinear susceptibility ??3? was estimated to be 1.7×10-14 esu,with the single-pulse energy of 1 ?J.2.Noble-transition bimetallic element Au/NiO and Au/Ni nanoparticles doped NBS glass were synthesized by sol-gel method and controlling redox atmosphere heat treatment.The microstructure of nanoparticles in the glass was analyzed by XRD,TEM and HRTEM,valence state information of the doped elements was analyzed by X-ray photoelectron spectroscopy?XPS?.The results showed Au nanoparticles formed both in the oxidation?O2?and reduction?H2?atmosphere,but Ni containing nanocrystalline presented different structure and the valence state information.At the same time,we used Z-scan technique?800 nm,190 fs,1 ?J,20 Hz?to study the third-order nonlinear optical properties of glass samples.The two glasses show reverse nonlinear absorption,and similar self-focusing nonlinear refraction behavior,third-order nonlinear optical susceptibility ??3? were 2.605 × 10-14 and 8.730 × 10-13 esu,respectively.3.Bimetallic Au/Cu nanoparticles doped red transparent glass by sol-gel and the reduction atmosphere heat treatment with different time.XRD,TEM and HRTEM analysis were applied to explore the microstructure of nanoparticles in the glass,XPS analysis revealed the valence state information of the Au and Cu elements.At the same time,the third-order nonlinear optical properties of the samples were tested by Z-scan technique?800 nm,190 fs,1 ?J,20 Hz?.Glass samples showed saturated absorption and self-focusing nonlinear refraction behavior,with the largest ??3?reaching 5.4×10-14 esu. |
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