Samanta, Aniruddha and Chanda, Dipak Kr and Das, Pradip Sekhar and Ghosh, Jiten and Dey, Arjun and Das, Sukhen and Mukhopadhyay, Anoop Kumar (2016) Synthesis of mixed calcite-calcium oxide nanojasmine flowers. Ceramics International, 42 (2, A). pp. 2339-2348. ISSN 0272-8842

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Here we report for the very first time a simple, inexpensive, room temperature synthesis method of formation of mixed calcite calcium oxide nanojasmines (CTCaONJs). The method involves chemical precipitation in aqueous medium at room temperature in open atmosphere in order to allow natural carbonation to occur. Aqueous solutions of calcium nitrate dihydrate (Ca(NO3)(2)center dot 2H(2)O) and sodium hydroxide are used as precursors. The nanopowder is characterized by the Fourier transform infrared (FTIR) spectrometry, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDAX), BET (Brunauer-Emmett-Teller), BJH (Barrett-Joyner-Halenda) techniques. Optical properties of nanojasmines (NJs) were investigated by UV-vis spectroscopy. The powder has calcite as the major phase and calcium oxide as the minor phase. The crystallite size of calcite along (104) crystallographic direction is about 18 nm with a size strain of about 1.03%. The high (e.g., 8.8 m(2)g(-1)) surface area powder exhibits a mesoporous microstructure with 5-15 nm pore size. Further, it possesses a relatively higher optical band gap of 5.87 eV. The FESEM and TEM based evidences show that the CTCaONJ flowers mainly comprise of nanoplatelets made up of irregular nanorods and nanowires consisting of amorphous spherical nanoparticles. Based on these experimental evidences a qualitative model is proposed to explain the growth mechanism of the CTCaONJ flowers. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 07 Nov 2016 06:26
Last Modified: 07 Nov 2016 06:26

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