Replies to This Discussion

Permalink Reply by Dr.J.Dharmaraja on July 27, 2010 at 11:43am

Dear sir ,i think you r correct.Kindly search the Spectoscopy books written by Lambert.This books give more idea about Uv.

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Permalink Reply by shiva on August 5, 2010 at 8:02am

by which method u have prepared iron oxide nps?

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Permalink Reply by Dr.J.Dharmaraja on August 26, 2010 at 12:28pm

Dear sir What is your wave lenth absorption value for your compound.

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Permalink Reply by Dr. Kuldeep S. Rathore on April 28, 2011 at 7:31am

sir it is all depend on absorption edge of this material in spectra .

also make me clear from which technique you measured a particle size.

 

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Permalink Reply by Kaushik Chandra Kalaga on April 30, 2011 at 4:52am

Dear Sir,

I think the value changes from the type of oxide you are dealing with. I have read few papers which report the value of alpha haematite as 2-2.2 eV. I am sharing a paper which reports that value.

http://www.nnin.org/doc/2005NNINreuCruz.pdf

You may want to look at this.

 

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Permalink Reply by Movaffaq Kateb on April 30, 2011 at 8:45am

Iron oxides show diluted magnetic semiconducting (DMS) behavior. This will make them proper choice for spintronic or spinelectronic. If you synthesized nanoparticles of magnetite then you must have slit difference from bulk state band gap which is 0.14 eV. But for it's Quantum dot (below 10 nm in diameter) the band gap widened about your value 3.9 eV. However the Spectroscopy of these nanoparticle needed exact setting  like scan rate, shadow and reference introduction and etc. If you did your Spectroscopy on substrate, I ask you try in colloidal state and be sure your solution concentration is in the range of Spectrometer device can Analysis it.

M. Kateb

TMU optoelectronic lab.

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