Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30127
Effect of Gamma Irradiation on Structural and Optical Properties of ZnO/Mesoporous Silica Nanocomposite

Authors: K. Sowri Babu, P. Srinath, N. Rajeswara Rao, K. Venugopal Reddy

Abstract:

The effect of gamma ray irradiation on morphology and optical properties of ZnO/Mesoporous silica (MPS) nanocomposite was studied. The ZnO/MPS nanocomposite was irradiated with gamma rays of doses 30, 60, and 90 kGy and dose-rate of irradiation was 0.15 kGy/hour. Irradiated samples are characterized with FE-SEM, FT-IR, UV-vis, and Photoluminescence (PL) spectrometers. SEM pictures showed that morphology changed from spherical to flake like morphology. UV-vis analysis showed that the band gap increased with increase of gamma ray irradiation dose. This enhancement of the band gap is assigned to the depletion of oxygen vacancies with irradiation. The intensity of PL peak decreased gradually with increase of gamma ray irradiation dose. The decrease in PL intensity is attributed to the decrease of oxygen vacancies at the interface due to poor interface and improper passivation between ZnO/MPS.

Keywords: ZnO nanoparticles, photoluminescence, porous silicon, nanocomposites.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1131311

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 663

References:


[1] A. Lajn, M. Schmidt, H. von Wenckstern, M. Grundmann, Transparent rectifying contacts for visible-blind ultraviolet photodiodes based on ZnO, J. Elect. Mater. 40 (2011) 473–476.
[2] T. Minami, T. Miyata, K. Ihara, Y. Minamino, S. Tsukada, Effect of ZnO film deposition methods on the photovoltaic properties of ZnO–Cu2O heterojunction devices, Thin Solid Films 494 (2006) 47–52.
[3] V. S. Khomchenko, N. N. Roshchina, L. V. Zavyalova, V. V. Strelchuk, G. S. Svechnikov, N. P. Tatyanenko, V. L. Gromashevskii, O. S. Litvin, E. A. Avramenko, B. A. Snopok, Structure and the emission and piezoelectric properties of MOCVD-grown ZnS, ZnS–ZnO, and ZnO films, Tech. Phys. 59 (2014) 93–101.
[4] Iu. G. Morozov, O. V. Belousova, D. Ortega, M. -K. Mafina, M. V. Kuznetkov, Structural, optical, XPS and magnetic properties of Zn particles capped by ZnO nanoparticles, J. Alloys. Compd. 633 (2015) 237–245.
[5] G. Hu, S. Q. Li, H. Gong, Y. Zhao, J. Zhang, T.L. Sudesh, L. Wijesinghe, D. J. Blackwood, J. Phys. Chem. C 113 (2009) 751.
[6] L. T. Canham, Appl. Phys. Lett. 57 (1990) 046.
[7] R. G. Singh, Fouran Singh, I. Sulania, D. Kanjilal, K. Sehrawat, V. Agarwal, R.M. Mehra, Electronic excitations induced modifications of structural and optical properties of ZnO–porous silicon nanocomposites, Nuclear Instruments and Methods in Physics Research B 267 (2009) 2399–2402.
[8] F. Tuomisto, K. Saarinen, D. C. look, G. C. Farlow, Introduction and recovery of point defects in electron-irradiated ZnO Physical Review B 72, 085206 (2005).
[9] K. SowriBabu, A. Ramachandra Reddy, Ch. Sujatha, K. Venugopal Reddy, Effect of Mg doping on photoluminescence of ZnO/MCM-41 nanocomposite, Ceramics International 38 (2012) 5949–5956.
[10] Z. Fu, B. Yang, L. Li, W. Dong, C. Jia, W. Wu, An intense ultraviolet photoluminescence in sol–gel ZnO–SiO2 nanocomposites, Journal of Physics: Condensed Matter 15 (2003) 2867–2873.