Enhanced UV absorbance and photoluminescence properties of ultrasound assisted synthesized gold doped ZnO nanorods

[Display omitted] •Ultrasound assisted synthesis of ZnO:Au nanorods.•Lattice expansion in ZnO with Au incorporation.•ZnO:Au shows high UV absorbance to be used as UV blocking agents.•Enhanced PL emission in green region may find application in LEDs. Au doped ZnO (ZnO:Au) nanostructures were synthesi...

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Bibliographic Details
Published in:Optical materials 2014-06, Vol.36 (8), p.1402-1407
Main Authors: Sahu, Dojalisa, Panda, N.R., Acharya, B.S., Panda, A.K.
Format: Article
Language:English
Subjects:
Absorbance
Au–ZnO nanorods
Doping
Electron microscopy
Emission
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Gold
Green luminescence
Nanorods
Optical materials
Optical properties
Optics
Physics
Ultrasonication
Ultrasound
Zinc oxide
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Summary:[Display omitted] •Ultrasound assisted synthesis of ZnO:Au nanorods.•Lattice expansion in ZnO with Au incorporation.•ZnO:Au shows high UV absorbance to be used as UV blocking agents.•Enhanced PL emission in green region may find application in LEDs. Au doped ZnO (ZnO:Au) nanostructures were synthesized by ultrasound assisted wet chemical method. The concentration of dopant was varied and both structural and optical properties of ZnO:Au were investigated. The crystal structure and morphology of the samples were examined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). These results showed the formation of nanorods of ZnO:Au having wurtzite structure and c-axis orientation. Gradual increase in crystallite size and bond length was also observed with the increase in gold concentration in ZnO intending the expansion of lattice after gold doping. The optical absorption measurements showed high ultraviolet (UV) absorbance property of ZnO:Au with sharp and intense absorption band in this region as compared to pristine ZnO. Photoluminescence (PL) measurements showed excitonic emission band of ZnO around 390nm for both undoped and Au doped ZnO nanoparticles. Further, a strong emission around 467nm was observed in the PL spectra of ZnO/ZnO:Au which was attributed to the transitions related to excess of oxygen vacancies. Interestingly, a new band was observed at 582nm for doped ZnO samples which grew in intensity with doping concentration. This band was ascribed to the gold nanoparticle adsorbed on the surface of ZnO.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2014.03.041