I have prepared nanoparticle in de-ionized water using laser ablation at 180 mJ laser energy...i calculated band gap as 4.26 eV using tauc plot and kept my sample in liquid for and after 15 days again i go for UV absorption spectroscopy and my Tauc plot showed that two band gaps appears one at 3.41 eV and other at 4.25. What might be the reason? I´m attaching my result.
Dear Collegue,
The curve (with this abrupt jump) seems to be due to an automathic change of scale in the electronic of your apparatous not from your sample.
Best regards
Pedro
Dear Tanzeeha,
If there are two semi-circular arcs for each of the doped samples, it suggest the dominance of grain boundary resistance to the grain resistance. The semicircle at higher frequencies can be credited to the grain boundary resistance and the arc at lower frequencies can be attributed to nanoparticle(pellet)/electrode interfaces.
Regards
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