Shape Evolution Of CdSe Nanomaterials In Microheterogenous Media

Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India

Adv. Mater. Lett., 2013, Ion Beam Special Issue, 4 (6), pp 449-453

DOI: 10.5185/amlett.2012.ib.112

Publication Date (Web): Mar 16, 2013

Copyright © IAAM-VBRI Press

E-mail: madhab@barc.gov.in

Abstract

Cadmium selenide, CdSe nanomaterials were synthesized in microhetergenous media consisting of water-in-oil type microemulsions using the surfactant, cetyl trimethyl ammonium bromide (CTAB) and cyclohexane as the oil, under two different experimental conditions. In one set of experiments, the synthesis was carried out by normal chemical route at room temperature, named as green chemistry route. In another set, the synthesis was carried out through radiation-chemical route using 7 MeV electron beam using a linear electron accelerator (LINAC). In the previous case, the shape of CdSe nanomaterials was found to evolve from isotropic spherical to anisotropic rod like structures in lower w₀ microemulsions with time. Similar observations were obtained in the case of CdSe nanomaterials synthesized via electron beam irradiation. The photoluminescence was found to be different in the CdSe nanomaterials formed by these two different routes. In the former case, the band gap photoluminescence was observed from the immediately produced nanomaterials, however with aging after a day there were two distinct band gap photoluminescence as well as trap state photoluminescence observed at room temperature. On the contrary, in the case of electron beam induced CdSe nanomaterials the trap state photoluminescence was always dominating irrespective of the aging.

Keywords

Shape, CdSe nanomaterials, CTAB microemulsion, electron beam irradiation, green chemistry.