Abstract
Gold nanoparticles of average size varying between 1.1 and 3.3 nm are prepared by 1064 nm Nd:YAG laser ablation of solid gold target kept in ethylene glycol medium. The measured UV-Visible absorption spectra showed the presence of sharp absorption peaks in the UV and in the visible regions due to the interband transition and surface plasmon resonance (SPR) oscillations in Au nanoparticles, respectively. The increase in linewidth of the SPR peaks with the reduction in particle sizes is observed due to intrinsic size effects. The prepared samples exhibit photoluminescence (PL) emissions in the UV-Visible region peaked at ∼354 nm due to the recombination of electrons with holes from sp conduction band to d-band of Au. The peak PL intensity in the sample prepared with 60 minutes of laser ablation time is enhanced by a factor of ∼2.5 compared to that obtained in the sample prepared with a laser-ablation time duration of 15 minutes.
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Acknowledgements
Authors are grateful to DST, Grant No. SR/FTP/PS-67/2008, Govt. of India for the partial financial support. We are thankful to both the reviewers for their valuable comments and suggestions in improving the manuscript.
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A.K. Mitra retired from Dept. of Physics, NIT Durgapur, India.
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Desarkar, H.S., Kumbhakar, P. & Mitra, A.K. Linear optical absorption and photoluminescence emission properties of gold nanoparticles prepared by laser ablation technique. Appl. Phys. A 108, 81–89 (2012). https://doi.org/10.1007/s00339-012-7016-1
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DOI: https://doi.org/10.1007/s00339-012-7016-1