3.1.1.3. Ultra Violet-Visible (UV-Vis) spectrum
The UV-Vis spectrum was illustrated in Figure 4 which representing the
absorbance spectrum of as-prepared cadmium oxide at the wavelength range
of 190 – 600 nm. The measurement proves that the absorption peak was
found at 302 nm. This peak proves the formation of CdO nanparticles
[14].
Figure 4: Wavelength vs Absorption of CdO nanoparticles
The energy band gap is measured with the help of absorption spectra and
a graph of ( 𝛼h𝜐)2 versus energy is
plotted. The energy band gap of cadmium oxide nanoparticle is 4.65 eV
that the value of band gaps increased due to quantum size effect.