Structural and optical characterization of fresh water diatoms (Cyclotella sp.): Nature's nanoporous silica manufacturing plant

Nirmal Mazumder, Ankur Gogoi, Alak K. Buragohain, Gazi A. Ahmed, Amarjyoti Choudhury

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

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 9Î=m 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.

Original languageEnglish
Title of host publicationQuantum Dots and Nanostructures
Subtitle of host publicationSynthesis, Characterization, and Modeling XI
PublisherSPIE
Volume8996
ISBN (Print)9780819499097
DOIs
Publication statusPublished - 2014
EventQuantum Dots and Nanostructures: Synthesis, Characterization, and Modeling XI - San Francisco, CA, United States
Duration: 03-02-201405-02-2014

Conference

ConferenceQuantum Dots and Nanostructures: Synthesis, Characterization, and Modeling XI
CountryUnited States
CitySan Francisco, CA
Period03-02-1405-02-14

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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    Mazumder, N., Gogoi, A., Buragohain, A. K., Ahmed, G. A., & Choudhury, A. (2014). Structural and optical characterization of fresh water diatoms (Cyclotella sp.): Nature's nanoporous silica manufacturing plant. In Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling XI (Vol. 8996). [89960Y] SPIE. https://doi.org/10.1117/12.2039793