Novel Methods of Forming Self-Assembled Nanostructured Materials: Ni Nanodots in Al2O3 and TiN Matrices
We have developed two novel methods of growing self-assembled nanodot arrays of uniform size (diameter 2–50 nm) of a variety of materials in crystalline as well as amorphous matrices. These methods employ a pulsed laser deposition technique and are classified as: (a) sequential growth method; and (b) simultaneous growth method. In the first method, the nanodots and matrix material are formed sequentially, while in the second method, nanodots and matrix materials grow simultaneously. In the sequential growth, self-assembly of nanodots is controlled by the flux of materials, interfacial energy, intervening matrix layer, substrate and laser parameters. For the simultaneous growth method of self-assembly of nanodots, there is additional requirement that the material of the nanodot and the matrix should be such that the Gibb's free energy of oxidation of the constituent of matrix material is much lower than that of the nanodot material.
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Document Type: Research Article
Publication date: 2004-09-01
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