skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Structural and optical properties of MgO doped ZnO

Abstract

Samples of ZnO, Zn{sub 0.5}Mg{sub 0.5}O and MgO were prepared by co-precipitation method. X-ray diffraction (XRD) pattern infers that the sample of ZnO is in single-phase wurtzite structure (hexagonal phase, space group P6{sub 3}mc), MgO crystallizes in cubic Fd3m space group and Zn{sub 0.5}Mg{sub 0.5}O represents mixed nature of ZnO and MgO lattices. Similar features were observed from Raman spectroscopy. The energy band gaps estimated from UV-Vis spectroscopy are found to be 4.21 and 3.42 eV for ZnO and Zn{sub 0.5}Mg{sub 0.5}O samples respectively.

Authors:
; ;  [1];  [2];  [3]
  1. School of Physics, Vigyan Bhavan, Devi Ahilya University, Khandwa Road Campus, Indore-452001 (India)
  2. Department of Physics, M. B. Khalsa College, Raj Mohallah, Indore-452002 (India)
  3. Department of Chemistry, Govt. B. V. T. PG Autonomous College, Durg- 491001 (India)
Publication Date:
OSTI Identifier:
22269438
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPRECIPITATION; CUBIC LATTICES; DOPED MATERIALS; HEXAGONAL LATTICES; MAGNESIUM OXIDES; OPTICAL PROPERTIES; PHASE SPACE; RAMAN SPECTROSCOPY; SPACE GROUPS; X-RAY DIFFRACTION; ZINC OXIDES

Citation Formats

Verma, Kavita, Shukla, S., Varshney, Dinesh, E-mail: vdinesh33@rediffmail.com, Varshney, M., and Asthana, A.. Structural and optical properties of MgO doped ZnO. United States: N. p., 2014. Web. doi:10.1063/1.4872570.
Verma, Kavita, Shukla, S., Varshney, Dinesh, E-mail: vdinesh33@rediffmail.com, Varshney, M., & Asthana, A.. Structural and optical properties of MgO doped ZnO. United States. doi:10.1063/1.4872570.
Verma, Kavita, Shukla, S., Varshney, Dinesh, E-mail: vdinesh33@rediffmail.com, Varshney, M., and Asthana, A.. Thu . "Structural and optical properties of MgO doped ZnO". United States. doi:10.1063/1.4872570.
@article{osti_22269438,
title = {Structural and optical properties of MgO doped ZnO},
author = {Verma, Kavita and Shukla, S. and Varshney, Dinesh, E-mail: vdinesh33@rediffmail.com and Varshney, M. and Asthana, A.},
abstractNote = {Samples of ZnO, Zn{sub 0.5}Mg{sub 0.5}O and MgO were prepared by co-precipitation method. X-ray diffraction (XRD) pattern infers that the sample of ZnO is in single-phase wurtzite structure (hexagonal phase, space group P6{sub 3}mc), MgO crystallizes in cubic Fd3m space group and Zn{sub 0.5}Mg{sub 0.5}O represents mixed nature of ZnO and MgO lattices. Similar features were observed from Raman spectroscopy. The energy band gaps estimated from UV-Vis spectroscopy are found to be 4.21 and 3.42 eV for ZnO and Zn{sub 0.5}Mg{sub 0.5}O samples respectively.},
doi = {10.1063/1.4872570},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1591,
place = {United States},
year = {Thu Apr 24 00:00:00 EDT 2014},
month = {Thu Apr 24 00:00:00 EDT 2014}
}
  • Al-doped ZnO (AZO) films of ~100nm thickness with various Aldoping were prepared at 150°C by atomic layer deposition on quartz substrates. At low Aldoping, the films were strongly textured along the [100] direction, while at higher Aldoping the films remained amorphous. Atomic force microscopy results showed that Al–O cycles when inserted in a ZnOfilm, corresponding to a few atomic percent Al, could remarkably reduce the surface roughness of the films. Hall measurements revealed a maximum mobility of 17.7cm{sup 2} /Vs . Film resistivity reached a minima of 4.4×10{sup -3} Ωcm whereas the carrier concentration reached a maxima of 1.7×10{sup 20}more » cm{sup -3} , at 3 at.% Al. The band gap of AZO films varied from 3.23 eV for undoped ZnOfilms to 3.73 eV for AZO films with 24.6 at.% Al. Optical transmittance over 80% was obtained in the visible region. The detrimental impact of increased Al resulting in decreased conductivity due to doping past 3.0 at.% is evident in the x-ray diffraction data, as an abrupt increase in the optical band gap and as a deviation from the Burstein–Moss effect.« less
  • Transparent conducting non-doped zinc oxide (ZnO) thin films have been deposited by the spray pyrolysis method at different substrate temperatures. X-ray diffraction spectra of the films have shown that the films are polycrystalline and hexagonal wurtzite in structure. From these spectra, grain size and texture coefficient (TC) are calculated. The analytical method for calculating lattice constants is used to calculate a and c for the films. The preferred orientation of non-doped ZnO thin films was changed with substrate temperature. The average optical transmittance of non-doped ZnO thin films was over 80% in the visible range. The optical band gap andmore » optical constants of the non-doped ZnO thin films were evaluated as dependent on the substrate temperatures. The substrate temperature have a significant effect on structural and optical properties of the non-doped ZnO thin films.« less
  • Pure and Co-doped zinc oxide nanomaterials were prepared by a simple low temperature synthesis and were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution-transmission electron microscopy (HR-TEM), diffused reflectance spectroscopy (DRS) and electron paramagnetic resonance (EPR) techniques. The results showed the formation of nanobushes that consists of several nanowires for pure ZnO and the nanorods formed by self-aggregation for Co-doped ZnO. The presence of Co{sup 2+} ions replacing some of the Zn{sup 2+} in the ZnO lattice was confirmed by EPR and DRS studies. The mechanism for the formation of self-aggregated and self-aligned ZnO rods after themore » incorporation of cobalt in the lattice by the building block units is discussed in this study. Morphological studies were carried out using SEM and HR-TEM, which supports the validity of the proposed mechanism for the formation of ZnO nanobushes and Co-doped ZnO nanorods. The synthesized nanomaterials were found to have good optoelectronic properties.« less
  • Here, synthesis, structural, morphological, Raman, optical properties and antibacterial activity of undoped and Ag doped ZnO nanorods by chemical co-precipitation technique have been reported. Structural analysis has revealed that Ag doping cannot deteriorate the structure of ZnO and wurtzite phase is maintained. Lattice constants are found to be decreased with the Ag doping. Fourier transform infrared and Raman spectroscopy also confirm the X-ray diffraction results. Scanning electron microscopy results have demonstrated the formation of ZnO nanorods with average diameter and length of 96 nm and 700 nm, respectively. Raman spectroscopy results suggest that the Ag doping enhances the number of defects inmore » ZnO crystal. It has been found from optical study that Ag doping results in positional shift of band edge absorption peak. This is attributed to the successful incorporation of Ag dopant into ZnO host matrix. The antibacterial activity of prepared nanorods has been determined by two different methods and compared to that of undoped ZnO nanorods. Ag doped ZnO nanorods exhibit excellent antibacterial activity as compared to that of undoped ZnO nanorods. This excellent antibacterial activity may be attributed to the presence of oxygen vacancies and Zn{sup 2+} interstitial defects. Our preliminary findings suggest that Ag doped ZnO nanorods can be used externally to control the spreading of infections related with tested bacterial strains.« less