Use of niobium oxide nanoparticles as nanofillers in PVP/PVA blends to enhance UV–visible absorption, opto-linear, and nonlinear optical properties,Journal of Vinyl and Additive Technology

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Use of niobium oxide nanoparticles as nanofillers in PVP/PVA blends to enhance UV–visible absorption, opto-linear, and nonlinear optical properties
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2022-01-11 , DOI: 10.1002/vnl.21892
H. Elhosiny Ali _{1,

2,

3} , M. A. Sayed _{3,

4} , H. Algarni ₁ , Yasmin Khairy ₂ , M. M. Abdel‐Aziz ₅

Affiliation

Transition metal oxide (TMO)—filled polymer films have numerous applications, including electromagnetic shielding and nonlinear optical devices. Nb₂O₅-filled polyvinyl pyrrolidone (PVP)/polyvinyl alcohol (PVA) blend was prepared using a solution casting process. Pristine and nanocomposite films from these blends were studied. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier infrared spectroscopy confirmed the formation of nanocomposites via interfacial interactions between the polymer chains and Nb₂O₅ nanoparticles. These nanoparticles influence the amorphous nature and transparency of the PVA/PVP blends. The improvement of D_opt (optical density) becomes particularly obvious in blended polymer films with considerable Nb₂O₅-nanofiller concentrations. By increasing the weight percentage of Nb₂O₅, the probability of producing additional levels in the bandgap increased. The optical absorption coefficient of each nanocomposite film was less than 10⁶ m⁻¹, indicating indirect electron transfer. Thus, the indirect optical band-gap declined from 3.9 to 1.9 eV as calculated from Tauc's and the absorption spectral fitting (ASF) formula. Additionally, the effects of Nb₂O₅ on the extinction coefficient, refractive index, high-frequency (ε_∞), and static-frequency (ε_o) dielectrics have been reported. The nonlinear refractive index and optical susceptibilities (x¹ and x³) were enhanced by increasing the Nb₂O₅ content in the blend. The penetration depth (δ) and optical limiting (OL) properties were also investigated. The developed nanocomposite materials could be used for advanced technology-based devices such as reflective coatings, opto-linear, and nonlinear optoelectronic applications.

中文翻译：

在 PVP/PVA 混合物中使用氧化铌纳米粒子作为纳米填料，以增强紫外-可见吸收、光线性和非线性光学特性

过渡金属氧化物 (TMO) 填充的聚合物薄膜具有多种应用，包括电磁屏蔽和非线性光学器件。Nb ₂ O ₅填充的聚乙烯吡咯烷酮(PVP)/聚乙烯醇(PVA)共混物是使用溶液浇铸工艺制备的。研究了来自这些共混物的原始和纳米复合薄膜。X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和傅里叶红外光谱证实了通过聚合物链和 Nb ₂ O ₅纳米颗粒之间的界面相互作用形成纳米复合材料。这些纳米颗粒影响 PVA/PVP 混合物的无定形性质和透明度。D _opt的改进_{（光密度）在具有相当大的 Nb 2} O ₅纳米填料浓度的共混聚合物薄膜中变得特别明显。通过增加 Nb ₂ O ₅的重量百分比，在带隙中产生额外能级的可能性增加。每个纳米复合膜的光吸收系数小于10 ⁶ m ^-1，表明间接电子转移。因此，根据 Tauc 和吸收光谱拟合 ( ASF ) 公式计算，间接光学带隙从 3.9 eV 下降到 1.9 eV 。此外，Nb ₂ O ₅对消光系数、折射率、高频（ε _∞ ) 和静态频率 ( ε _o ) 电介质已被报道。非线性折射率和光学敏感性（x ¹和x ³）通过增加共混物中的Nb ₂ O _{5含量而提高。}还研究了穿透深度 ( δ ) 和光学限制 (OL) 特性。开发的纳米复合材料可用于基于先进技术的设备，例如反射涂层、光线性和非线性光电子应用。

更新日期：2022-01-11

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