Optical properties of electron irradiated Bombyx mori silk fibroin films

被引：11
作者：
Asha S. [1 ]
Sangappa Y. [1 ]
Sanjeev G. [1 ]
机构：
[1] Department of Studies in Physics, Mangalore University, Mangalagangotri, Mangalore
来源：
Journal of Optics | 2016年 / 45卷 / 1期
关键词：
Dielectric constants; Electron irradiation; Energy band gap; Optical conductivity; Refractive index; Silk fibroin films;
D O I：
10.1007/s12596-015-0267-4
中图分类号：
学科分类号：
摘要：
Energetic electron irradiation effects on the optical properties of Bombyx mori silk fibroin (SF) films are studied using UV–visible spectrophotometer. The recorded UV–visible absorption and transmission graphs have been used to determine the optical band gap (Eg), refractive index (n), extinction coefficient (k), optical conductivity (σopt) and dielectric constants (ε*) of the films. The studies have shown a reduction in optical band gap and increase in refractive index with increasing electron dosage. It is also observed that dielectric constants increase with increasing photon energy. The observed optical changes have been tried to be correlated with the structural changes, revealed through FT-IR spectroscopy. These results indicate that the refractive index of SF films can be changed efficiently by electron irradiation. © 2015, The Optical Society of India.
引用
收藏
页码：66 / 72
页数：6
相关论文
共 39 条
  • [1] Metcalfe A.D., Ferguson M.W., Bioengineering skin sing mechanisms of regeneration and repair, Biomaterials, 34, pp. 5100-5113, (2007)
  • [2] Kim U.J., Park J.Y., Li C.M., Jin H.J., Valluzzi R., Kaplan D.L., Structure and properties of silk hydrogels, Biomacromolecules, 5, pp. 786-792, (2004)
  • [3] Jiang C.Y., Wang X.Y., Gunawidjaja R., Lin Y.H., Gupta M.K., Kaplan D.L., Naik R.R., Tsukruk V.V., Mechanical properties of robust ultrathin silk films, Adv. Funct. Mater., 17, pp. 2229-2237, (2007)
  • [4] Wang X.Y., Kim H.J., Xu P., Matsumoto A., Kaplan D.L., Biomaterial coatings by stepwise deposition of silk fibroin, Langmuir, 11, pp. 11335-11341, (2005)
  • [5] Wang X.Y., Hu X., Daley A., Rabotyagova O., Cebe P., Kaplan D.L., Nanolayer biomaterial coatings of silk fibroin for controlled release, J. Control. Release, 121, pp. 190-199, (2007)
  • [6] Ghosh S., Parker S.T., Wang X., Kaplan D.L., Lewis J.A., Direct-write assembly of micro-periodic silk fibroin scaffolds for tissue engineering applications, Adv. Funct. Mater., 18, pp. 1883-1889, (2008)
  • [7] Lawrence B.D., Cronin-Golomb M., Georgakoudi I., Kaplan D.L., Omenetto F.G., Bioactive silk protein biomaterial systems for optical devices, Biomacromolecules, 9, pp. 1214-1220, (2008)
  • [8] Perry H., Dal Negro L., Gopinat A., Kaplan D.L., Omenetto F.G., Nano and micropattering of optically transparent, mechanically robust, biocompatibility silk fibroin films, Adv. Mater., 20, pp. 3070-3072, (2008)
  • [9] Altman G.H., Diaz F., Jakuba C., Calabro T., Horan R.L., Chen J.S., Lu H., Richmond J., Kaplan D.L., Silk based biomaterials, Biomaterials, 24, pp. 401-416, (2003)
  • [10] Lawrence B.D., Omenetto F., Chui K., Kaplan D.L., Processing method to control silk fibroin film biomaterial features, J. Mater. Sci., 43, (2008)
1234