Structural, optical and electron paramagnetic resonance studies on Cu-doped ZnO nanoparticles synthesized using a novel auto-combustion method

doi:10.1007/s11706-013-0198-4

Front Mater Sci

2013, Vol. 7

Issue (2) : 196-201 https://doi.org/10.1007/s11706-013-0198-4

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Structural, optical and electron paramagnetic resonance studies on Cu-doped ZnO nanoparticles synthesized using a novel auto-combustion method

R. ELILARASSI(

), G. CHANDRASEKARAN

Magnetism and Nanomagnetic Materials Lab, Department of Physics, School of Physical, Chemical and Applied Sciences, Pondicherry University, Puducherry 605014, India

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Abstract

Nanocrystalline Zn_1-xCu_xO (x = 0, 0.02, 0.04, 0.06, 0.08) samples were synthesized by a novel auto-combustion method using glycine as the fuel material. The structural, optical and magnetic properties of the samples were characterized using XRD, SEM, photoluminescence (PL) and electron paramagnetic resonance (EPR) spectroscopies. The XRD spectra of samples reveal the hexagonal wurtzite structures of ZnO. As the copper content increases, a diffraction peak at 2θ = 39° corresponding to secondary phase of CuO ([111] crystalline face) appears when x≤6 mol.%. PL spectra of the samples show a strong ultraviolet (UV) emission and defect related visible emissions. Cu-doping in ZnO can effectively adjust the energy level in ZnO, which leads to red shift in the emission peak position in UV region. The EPR spectra of Cu-doped ZnO nanoparticles show a distinct and broad signal at room temperature, suggesting that it may be attributed to the exchange interactions within Cu²⁺ ions.

Keywords Cu-doped ZnO auto-combustion luminescence electron paramagnetic resonance (EPR)

Corresponding Author(s): ELILARASSI R.,Email:ezhil1984_r@yahoo.co.uk

Issue Date: 05 June 2013

Cite this article:

R. ELILARASSI,G. CHANDRASEKARAN. Structural, optical and electron paramagnetic resonance studies on Cu-doped ZnO nanoparticles synthesized using a novel auto-combustion method[J]. Front Mater Sci, 2013, 7(2): 196-201.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-013-0198-4
https://academic.hep.com.cn/foms/EN/Y2013/V7/I2/196

Fig.1 A schematic diagram of the auto-combustion method.

Fig.2 XRD patterns of Cu-doped ZnO nanoparticles annealed at 500°C.

Tab.1 Particle size and lattice parameters of Cu-doped ZnO samples annealed at 500°C

Fig.3 SEM image of the Cu-doped ZnO sample ZnCuO annealed at 500°C.

Fig.4 PL spectra of Cu-doped ZnO nanoparticles annealed at 500°C.

Fig.5 EPR spectra of Cu-doped ZnO nanoparticles annealed at 500°C.

Tab.2 EPR parameters of Cu-doped ZnO nanoparticles annealed at 500°C

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