UV irradiated PVA-Ag nanocomposites for optical applications

被引：56

作者：

Chahal, Rishi Pal ^{[1
]}

Mahendia, Suman ^{[1
]}

Tomar, A. K. ^{[2
]}

Kumar, Shyam ^{[1
]}

机构：

[1] Kurukshetra Univ, Dept Phys, Kurukshetra 136119, Haryana, India

[2] SA Jain PG Coll, Dept Phys, Ambala City 134003, India

来源：

APPLIED SURFACE SCIENCE | 2015年 / 343卷

关键词：

UV irradiation; Optical energy gap; Refractive index; Anti reflection coating; REFRACTIVE-INDEX; THIN-FILMS; NANOPARTICLES; CONSTANTS; POLYMERS; GAIN;

D O I：

10.1016/j.apsusc.2015.03.074

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The present paper is focused on the in-situ prepared Poly (vinyl alcohol)-Silver (PVA-Ag) nanocomposites and tailoring their optical properties by means of UV irradiation in such a way that these can be used for anti-reflective coatings and bandpass filters. The reflectance from these irradiated nanocomposites has been found to decrease leading to the increase in refractive index (RI), with increasing UV exposure time, in the entire visible region. Decrease in optical energy gap of PVA film from 4.92 to 4.57 eV on doping with Ag nanoparticles has been observed which reduces further to 4.1 eV on exposure to UV radiations for 300 min. This decrease in optical energy gap can be correlated to the formation of charge transfer complexes within the base polymer network on embedding Ag nanoparticles, which further enhances with increasing exposure time. Such complexes may also be responsible for increased molecular density of the composite films which corresponds to decrease in reflectance corroborating the observed results. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：160 / 165

页数：6

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