Table 1:
Calculated value of particle size (
) by using the first exciton peak. First exciton peak (
) values are extracted from the second derivative of the absorbance spectra.
Heat treatment
temperature (°C)
(eV)
(nm)
100
4.75
2.84
125
4.70
2.90
150
4.63
2.98
175
4.54
3.10
200
4.46
3.24