Nano-structured silica on diatoms and its optical properties

ISBN-13: 9783659713712 / Angielski / Miękka / 2015 / 52 str.

Gogoi Ankur;Mazumder Nirmal

Opis

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).It was observed that the frustules were composed mostly of silica (~87 at %), and metal oxides (~11.5 at %) as found from FT-IR and EDX measurements. Optical emission showed clear bands at 440 and 375 nm which arise due to silica microstructures of size 200 nm. Photonics device can be manufactured with this nature made nanostructure.

O autorze

Dr Nirmal Mazumder pursued his PhD in Biophtonics from National Yang Ming University, Taiwan. He is optical microscopist. Currently, he is a postdoctoral fellow. Dr. Ankur Gogoi completed his PhD in Physics from Tezpur University, India and presently is working as an assistant profes