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聚乙烯醇：碳点复合材料的结构与光学特性：调节紫外区域的吸收

Structural and Optical Characteristics of PVA:C-Dot Composites: Tuning the Absorption of Ultra Violet (UV) Region.

作者信息

Aziz Shujahadeen B, Hassan Aso Q, Mohammed Sewara J, Karim Wrya O, Kadir M F Z, Tajuddin H A, Chan N N M Y

机构信息

Advanced Polymeric Materials Research Laboratory, Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq.

Komar Research Center (KRC), Komar University of Science and Technology, Sulaimani 46001, Kurdistan Regional Government, Iraq.

出版信息

Nanomaterials (Basel). 2019 Feb 6;9(2):216. doi: 10.3390/nano9020216.

DOI:10.3390/nano9020216
PMID:30736346
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6410024/
Abstract

In this work the influence of carbon nano-dots (CNDs) on absorption of ultra violet (UV) spectra in hybrid PVA based composites was studied. The FTIR results reveal the complex formation between PVA and CNDs. The shifting was observed in XRD spectrum of PVA:CNDs composites compared to pure PVA. The Debye-Scherrer formula was used to calculate the crystallite size of CNDs and crystalline phases of pure PVA and PVA:CNDs composites. The FESEM images emphasized the presence and dispersion of C-dots on the surface of the composite samples. From the images, a strong and clear absorption was noticed in the spectra. The strong absorption that appeared peaks at 280 nm and 430 nm can be ascribed to the n-π* and π-π* transitions, respectively. The absorption edge shifted to lower photon energy sides with increasing CNDs. The luminescence behavior of PVA:CNDs composite was confirmed using digital and photo luminescence (PL) measurements. The optical dielectric constant which is related to the density of states was studied and the optical band gap was characterized accurately using optical dielectric loss parameter. The Taucs model was used to determine the type of electronic transition in the samples.

摘要

在这项工作中，研究了碳纳米点（CNDs）对基于聚乙烯醇（PVA）的混合复合材料中紫外（UV）光谱吸收的影响。傅里叶变换红外光谱（FTIR）结果揭示了PVA与CNDs之间形成的复合物。与纯PVA相比，在PVA:CNDs复合材料的X射线衍射（XRD）光谱中观察到了位移。德拜-谢乐公式用于计算CNDs的微晶尺寸以及纯PVA和PVA:CNDs复合材料的晶相。场发射扫描电子显微镜（FESEM）图像强调了碳点在复合样品表面的存在和分散情况。从图像中可以注意到光谱中有强烈且清晰的吸收。分别在280nm和430nm处出现峰值的强吸收可归因于n-π和π-π跃迁。随着CNDs含量的增加，吸收边向较低光子能量侧移动。使用数字和光致发光（PL）测量证实了PVA:CNDs复合材料的发光行为。研究了与态密度相关的光学介电常数，并使用光学介电损耗参数精确表征了光学带隙。使用陶克斯（Taucs）模型确定样品中的电子跃迁类型。

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