G. S. Sanyal

Synthesis of Sb2Se3 nanorod using β-cyclodextrin

Abstract A novel method is described for the preparation of antimony selenide nanorod in the presence of β-cyclodextrin. The nanorod is obtained by the addition of β-cyclodextrin (5 mM) in a reaction mixture of potassium antimony oxide tartrate and sodium selenosulfate in alkaline pH (∼10.80), while chainlike structures of antimony selenide are formed at a lower concentration of β-cyclodextrin (2 mM).

Self-assembly of tellurium nanorods

A simple solution phase approach is utilized to obtain tellurium microrod resulting from the self assembly of tellurium nanorod. The length of tellurium microrod can be tuned; manipulating the experimental condition the length of these rods can be made in centimeter range. Tellurium nanorods are synthesized by simple chemical recycling process, just reducing bulk Te powder by an aqueous solution of sodium dithionite and then oxidizing the solution in air to get Te nanorods. By controlling the airflow we can grow tellurium microrod by assembling these nanorods.

Studies on nanocrystalline Ag2Se

Silver selenide nanocrystals were synthesized using a chemical route by the interaction of ammoniacal silver nitrate and sodium selenosulfate in aqueous medium. The prepared samples were characterized by XRD, EDXA, and TEM. UV-VIS absorption spectrum of the nanocrystals shows that the optical band gap of the material is 1.72 eV, which is quite larger than the bulk phase of the materials. Thermal analysis exhibits that the phase changes from β to α at the transition temperature 406 K. Electrical conduction and thermoelectric power measurements also show the presence of two distinct phases of the materials and characteristic changes in transport properties due to the nanosize of the materials.