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Proceedings Paper

Structural and optical characterization of fresh water diatoms (Cyclotella sp.): nature's nanoporous silica manufacturing plant
Author(s): Nirmal Mazumder; Ankur Gogoi; Alak K. Buragohain; Gazi A. Ahmed; Amarjyoti Choudhury
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Paper Abstract

Siliceous frustules were extracted from a representative fresh water diatom species (Cyclotella sp.) by treating with aqueous hydrochloric (HCl) acid. The structural characterizations of cleaned frustules were examined by scanning electron microscope (SEM). The microscopy images showed that the diatoms have a regular circular shape and are of almost equal size (average length is 9μm and average width is 3 μm). From energy dispersive X –ray spectroscopy (SEM-EDS) spot analysis it was confirmed that the frustules isolated from diatoms are composed mainly of silicon in the form of amorphous silica (SiO2). The bond information of chemical substances of diatom frustules was carried out at ambient temperature by means of Fourier Transform Infrared (FTIR) Spectroscopy. FTIR spectrum as recorded in transmittance mode showed the characteristic peaks for diatom biosilica, including for Si-O-Si stretching vibration at 1057 and 776 cm-1. Photoluminescence (PL) measurements of diatom frustules were performed at room temperature and it was observed that they emitted strong blue PL centered at 440nm when excited with ultraviolet (UV) radiation.

Paper Details

Date Published: 19 February 2014
PDF: 8 pages
Proc. SPIE 8996, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling XI, 89960Y (19 February 2014); doi: 10.1117/12.2039793
Show Author Affiliations
Nirmal Mazumder, National Yang-Ming Univ. (Taiwan)
Ankur Gogoi, Jagannath Barooah College (India)
Alak K. Buragohain, Tezpur Univ. (India)
Gazi A. Ahmed, Tezpur Univ. (India)
Amarjyoti Choudhury, Tezpur Univ. (India)

Published in SPIE Proceedings Vol. 8996:
Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling XI
Diana L. Huffaker; Frank Szmulowicz; Holger Eisele, Editor(s)

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