Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10640062 | Materials Science and Engineering: B | 2005 | 10 Pages |
Abstract
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 â¼35 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
A. Sreekumaran Nair, V. Suryanarayanan, T. Pradeep, Jinto Thomas, M. Anija, Reji Philip,