Influence of cobalt doping on structure, optical and magnetic properties of spray pyrolysed nano structured ZnO films

Sindhu H. S, Suresh D. Kulkarni, R. J. Choudhary, P. D. Babu, B. V. Rajendra

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Zn1-xCoxO (x = 0–10 at%) films were prepared using the spray pyrolysis method at 723 K on glass substrates. The structural and transport properties of Zn1-xCoxO deposits were studied using X-ray Diffraction(XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), UV-VIS Spectrophotometer and Vibrating Sample Magnetometer (VSM). XRD analysis confirmed a hexagonal wurtzite-type structure with a preferential orientation in the (0 0 2) plane, indicating Co2+ ion in the ZnO host matrix, and absence of secondary phase of the metals in the ZnO host matrix. The surface morphology modified from fibrous to spherical grain shape with enrichment of cobalt in the deposits. The composition analysis indicates the existence of Zinc and Cobalt. The XPS analysis provides the dopant exists in Co2+ state. The optical absorption edge shift to a higher wavelength of three band transitions corresponds to the 4A22 E(G), 4A24T1(P) and 4A22A1(G) states. The reduction of energy band gap Eg1 in the UV region and Eg2 in the visible region was observed, which is due to the spin exchange interaction occurs in the sp-d transition state. At room temperature photoluminescence (PL) spectra showed emission in the UV and entire visible region due to the various defect states present in the deposits. All deposits show paramagnetic behavior even at low temperature.

Original languageEnglish
Pages (from-to)18-26
Number of pages9
JournalPhysica B: Condensed Matter
Volume572
DOIs
Publication statusPublished - 01-11-2019

Fingerprint

Cobalt
sprayers
Magnetic properties
cobalt
Deposits
Optical properties
deposits
Doping (additives)
magnetic properties
optical properties
x rays
X ray photoelectron spectroscopy
photoelectron spectroscopy
Ultraviolet spectrophotometers
Spray pyrolysis
spin exchange
Exchange interactions
Magnetometers
spectrophotometers
matrices

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

@article{6980f885bb5245e7a6ea1cf00ec82c20,
title = "Influence of cobalt doping on structure, optical and magnetic properties of spray pyrolysed nano structured ZnO films",
abstract = "Zn1-xCoxO (x = 0–10 at{\%}) films were prepared using the spray pyrolysis method at 723 K on glass substrates. The structural and transport properties of Zn1-xCoxO deposits were studied using X-ray Diffraction(XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), UV-VIS Spectrophotometer and Vibrating Sample Magnetometer (VSM). XRD analysis confirmed a hexagonal wurtzite-type structure with a preferential orientation in the (0 0 2) plane, indicating Co2+ ion in the ZnO host matrix, and absence of secondary phase of the metals in the ZnO host matrix. The surface morphology modified from fibrous to spherical grain shape with enrichment of cobalt in the deposits. The composition analysis indicates the existence of Zinc and Cobalt. The XPS analysis provides the dopant exists in Co2+ state. The optical absorption edge shift to a higher wavelength of three band transitions corresponds to the 4A2→2 E(G), 4A2→4T1(P) and 4A2→2A1(G) states. The reduction of energy band gap Eg1 in the UV region and Eg2 in the visible region was observed, which is due to the spin exchange interaction occurs in the sp-d transition state. At room temperature photoluminescence (PL) spectra showed emission in the UV and entire visible region due to the various defect states present in the deposits. All deposits show paramagnetic behavior even at low temperature.",
author = "{H. S}, Sindhu and {D. Kulkarni}, Suresh and Choudhary, {R. J.} and Babu, {P. D.} and Rajendra, {B. V.}",
year = "2019",
month = "11",
day = "1",
doi = "10.1016/j.physb.2019.07.034",
language = "English",
volume = "572",
pages = "18--26",
journal = "Physica B: Condensed Matter",
issn = "0921-4526",
publisher = "Elsevier",

}

Influence of cobalt doping on structure, optical and magnetic properties of spray pyrolysed nano structured ZnO films. / H. S, Sindhu; D. Kulkarni, Suresh; Choudhary, R. J.; Babu, P. D.; Rajendra, B. V.

In: Physica B: Condensed Matter, Vol. 572, 01.11.2019, p. 18-26.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence of cobalt doping on structure, optical and magnetic properties of spray pyrolysed nano structured ZnO films

AU - H. S, Sindhu

AU - D. Kulkarni, Suresh

AU - Choudhary, R. J.

AU - Babu, P. D.

AU - Rajendra, B. V.

PY - 2019/11/1

Y1 - 2019/11/1

N2 - Zn1-xCoxO (x = 0–10 at%) films were prepared using the spray pyrolysis method at 723 K on glass substrates. The structural and transport properties of Zn1-xCoxO deposits were studied using X-ray Diffraction(XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), UV-VIS Spectrophotometer and Vibrating Sample Magnetometer (VSM). XRD analysis confirmed a hexagonal wurtzite-type structure with a preferential orientation in the (0 0 2) plane, indicating Co2+ ion in the ZnO host matrix, and absence of secondary phase of the metals in the ZnO host matrix. The surface morphology modified from fibrous to spherical grain shape with enrichment of cobalt in the deposits. The composition analysis indicates the existence of Zinc and Cobalt. The XPS analysis provides the dopant exists in Co2+ state. The optical absorption edge shift to a higher wavelength of three band transitions corresponds to the 4A2→2 E(G), 4A2→4T1(P) and 4A2→2A1(G) states. The reduction of energy band gap Eg1 in the UV region and Eg2 in the visible region was observed, which is due to the spin exchange interaction occurs in the sp-d transition state. At room temperature photoluminescence (PL) spectra showed emission in the UV and entire visible region due to the various defect states present in the deposits. All deposits show paramagnetic behavior even at low temperature.

AB - Zn1-xCoxO (x = 0–10 at%) films were prepared using the spray pyrolysis method at 723 K on glass substrates. The structural and transport properties of Zn1-xCoxO deposits were studied using X-ray Diffraction(XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), UV-VIS Spectrophotometer and Vibrating Sample Magnetometer (VSM). XRD analysis confirmed a hexagonal wurtzite-type structure with a preferential orientation in the (0 0 2) plane, indicating Co2+ ion in the ZnO host matrix, and absence of secondary phase of the metals in the ZnO host matrix. The surface morphology modified from fibrous to spherical grain shape with enrichment of cobalt in the deposits. The composition analysis indicates the existence of Zinc and Cobalt. The XPS analysis provides the dopant exists in Co2+ state. The optical absorption edge shift to a higher wavelength of three band transitions corresponds to the 4A2→2 E(G), 4A2→4T1(P) and 4A2→2A1(G) states. The reduction of energy band gap Eg1 in the UV region and Eg2 in the visible region was observed, which is due to the spin exchange interaction occurs in the sp-d transition state. At room temperature photoluminescence (PL) spectra showed emission in the UV and entire visible region due to the various defect states present in the deposits. All deposits show paramagnetic behavior even at low temperature.

UR - http://www.scopus.com/inward/record.url?scp=85073703740&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85073703740&partnerID=8YFLogxK

U2 - 10.1016/j.physb.2019.07.034

DO - 10.1016/j.physb.2019.07.034

M3 - Article

AN - SCOPUS:85073703740

VL - 572

SP - 18

EP - 26

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

ER -