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AuxAgy@ZrO2 core–shell nanoparticles: synthesis, characterization, reactivity and optical limiting

Sreekumaran Nair, A and Suryanarayanan, V and Pradeep , T and Thomas, Jinto and Anija, M and Reji, Philip (2005) AuxAgy@ZrO2 core–shell nanoparticles: synthesis, characterization, reactivity and optical limiting. Materials Science and Engineering B, 117 (2). pp. 173-182.

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AuxAgy@ZrO2 redispersible core–shell nanoparticles were prepared by a single step synthesis using the dimethyl formamide (DMF) reduction procedure. The material is stable for extended periods of time. The core–shell alloy nanoparticles were characterized by UV–vis spectroscopy, transmission electron microscopy, X-ray diffraction, differential scanning calorimetry and cyclic voltammetry. The as prepared particles are nanocrystalline in nature, but they give well-defined diffraction patterns upon heating to 100 °C for 8 h. The average diameter of the core is not, vert, similar35 nm and typical shell thickness is 2–3 nm. The materials show interesting reactivity with halocarbons as in the case of naked metal nanoparticles, which vary with the composition of the alloy. Our experiments show that oxide-protected alloy nanoparticles are excellent optical limiters in the nanosecond regime. Optical nonlinearity of these systems has been investigated in detail and a qualitative model has been proposed. To the best of our knowledge, this is the first report of nanoparticles having a true alloy core and an oxide shell.

Item Type:Article
Subjects:Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:4340
Deposited By:JNCASR
Deposited On:03 Apr 2009 05:26
Last Modified:03 Apr 2009 12:34

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