Luminescence properties of a nanoporous freshwater diatom |
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Authors: | Bondita Goswami Amarjyoti Choudhury Alak K Buragohain |
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Institution: | 1. Department of Physics, Tezpur University, , Tezpur, 784028 Assam, India;2. Department of Molecular Biology and Biotechnology, Tezpur University, , Tezpur, 784028 Assam, India |
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Abstract: | Freshwater diatom frustules show special optical properties. In this paper we observed luminescence properties of the freshwater diatom Cyclotella meneghiniana. To confirm the morphological properties we present scanning electron microscopy (SEM) images. X‐ray diffraction (XRD) studies were carried out to visualize the structural properties of the frustules, confirming that silica present in diatom frustules crystallizes in an α‐quartz structure. Study of the optical properties of the silica frustules of diatoms using ultra‐violet‐visible (UV‐vis) spectroscopy and photoluminescence spectroscopy confirmed that the diatom C. meneghiniana shows luminescence in the blue region of the electromagnetic spectrum when irradiated with UV light. This property of diatoms can be exploited to obtain many applications in day‐to‐day life. Also, using time‐resolved photoluminescence spectroscopy (TRPL) it was confirmed that this species of diatom shows bi‐exponential decay. Copyright © 2011 John Wiley & Sons, Ltd. |
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Keywords: | culture diatom frustule α ‐quartz luminescence |
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