I would like to know about band gap energy of the iron oxide nanoparticles of size about 20 nm that I have prepared. Accordingly I got the value around 3.88 eV. by UV-VIS spectrum. Is it correct value . since I refer some papers that shows Iron oxide is a semiconductor , and the semiconductors have the value of Eg around 0.5 to 5 eV. please suggest me
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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.
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.
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.