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Effect of various morphologies on the optical and electrical properties of boehmite nanostructures

Abstract

Present article reports three different grain morphologies of boehmite nanoparticles, spherical (EBH), needle-shaped (UBH) and flower-like (HBH). EBH possess the largest surface area whereas HBH has the lowest. A novel synthesis route for spherical (EBH) boehmite nanostructures using ethylenediamine has been reported here. Moreover, we have compared the growth mechanisms and morphology dependent changes in optical and electrical properties of the three samples. Band gap energies are evaluated to be 5.30 eV, 5.44 and 5.87 eV for EBH, UBH and HBH respectively. Strong photoluminescence (PL) emission for all the nanostructures, highest for HBH, is noticed. Lowest surface area of HBH provides a surface with fewer defects sealing the possibility of energy loss via non-radiative recombination of electrons and holes which enhances the PL intensity. Dielectric constants for EBH, UBH and HBH are 1.49x106, 1.14x105, and 7.14x104 respectively. Variations of dielectric loss tangent and temperature dependent electrical properties for the three morphologies are evaluated in support. Also ac conductivity and impedance analysis are in good accordance with our dielectric analysis. Present investigation could be highly beneficial in developing biosensors, bio-imaging and fabricating cost effective energy storage devices.

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Publication details

The article was received on 16 Jul 2018, accepted on 12 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8CE01171K
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Effect of various morphologies on the optical and electrical properties of boehmite nanostructures

    S. Roy, A. Maity, P. Mandal, D. Kr. Chanda, K. Pal, S. Bardhan and S. Das, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01171K

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