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Effect of aging on copper nanoparticles synthesized by pulsed laser ablation in water: structural and optical characterizations

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Abstract

Effect of aging on copper nanoparticles synthesized by pulsed laser ablation of copper plate in water was studied. By characterization studies of the aged nanoparticles, it is found that copper nanoparticles converted into Cu@Cu2O nanostructure. The synthesized nanomaterial is characterized with UV-Visible absorption, transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and Raman and photoluminescence (PL) spectroscopic techniques. TEM image shows that the aged nanoparticles get assembled into cactus like structure and are spherical in shape with average diameter 7 nm and dispersion 2 nm. XRD and FTIR spectrum confirm the formation of Cu@Cu2O in the aged sample. Raman spectrum also confirms the presence of Cu2O nanoparticles. PL spectrum of the aged nanoparticles shows a direct allowed transition with bandgap energy of 2·24 eV. The mechanism for synthesis of core-shell nanoparticles and formation of self-assembly of nanoparticles is also discussed.

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Authors and Affiliations

  1. Laser Spectroscopy & Nanomaterial Lab, Physics Department, University of Allahabad, Allahabad, 211 002, India

    R. K. Swarnkar, S. C. Singh & R. Gopal

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  1. R. K. Swarnkar
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  2. S. C. Singh
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  3. R. Gopal
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Correspondence to R. K. Swarnkar.

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Swarnkar, R.K., Singh, S.C. & Gopal, R. Effect of aging on copper nanoparticles synthesized by pulsed laser ablation in water: structural and optical characterizations. Bull Mater Sci 34, 1363–1369 (2011). https://doi.org/10.1007/s12034-011-0329-4

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  • DOI: https://doi.org/10.1007/s12034-011-0329-4

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