High quality oxide-free metallic nanoparticles: a strategy for synthesis through laser ablation in aqueous medium
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The paper explores the synthesis of oxide-free nanoparticles of Ag and Cu through laser ablation of pure targets under aqueous medium and tuning the quality and size through addition of Polyvinylpyrrolidone (PVP) in the medium. The size distribution of nanoparticles reduces from 37 ± 30 nm and 13 ± 5 nm to 32 ± 12 nm and 4 ± 1 nm for Ag and Cu with changes in PVP concentration from 0.00 to 0.02 M, respectively. Irregular shaped particles of Ag with Ag2O phase and a Cu–Cu2O core–shell particles form without the addition of PVP, while oxide layer is absent with 0.02 M of PVP. The recent understanding of the mechanism of particle formation during laser ablation under liquid medium allows us to rationalize our observation.
KeywordsLaser Ablation Cu2O Laser Energy Ag2O Plasma Plume
The authors would like to acknowledge the microscopy facilities available at Advanced Facility for Microscopy and Microanalysis (AFMM), Indian Institute of Science, Bangalore, India.
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