Impact of annealing on the structural and optical properties of methylene green nanostructure films prepared by drop casting

被引：34

作者：

El-Menyawy, E. M. ^{[1
]}

Darwish, A. A. A. ^{[2
,3
]}

Zedan, I. T. ^{[4
]}

机构：

[1] Natl Res Ctr, Solid State Elect Lab, Dept Solid State Phys, Phys Res Div, 33 El Bohouth St, Giza 12622, Egypt

[2] Sanaa Univ, Fac Educ Al Mahweet, Dept Phys, Al Mahweet, Yemen

[3] Univ Tabuk, Dept Phys, Fac Sci, Tabuk, Saudi Arabia

[4] High Inst Engn & Technol, Dept Basic Sci, Al Arish, North Sinai, Egypt

来源：

OPTICS AND LASER TECHNOLOGY | 2016年 / 79卷

关键词：

Organic compounds; X-ray diffraction; Optical properties; THIN-FILMS;

D O I：

10.1016/j.optlastec.2015.12.006

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The methylene green (MG) powder was found to be polycrystalline with the triclinic system. MG films were deposited by drop coating technique. X-ray diffraction and scanning electron microscopy showed that the MG films have nanostructure nature. It is found that the crystal size is increased by annealing. Optical properties of nanostructured MG films were performed in the spectral range from 200 to 2500 nm to determine the optical constants (n and k). The absorption coefficient of the as-deposited film revealed a two indirect allowed optical band gap with values of 1.90 and 3.11 eV, which increased by annealing to 2 and 3.48 eV, respectively. The dispersion of n was discussed in terms of the single oscillator model. The high frequency dielectric constant and the lattice dielectric constant were estimated and found to decreased by annealing. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：158 / 163

页数：6

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