Samples
Optical band gap
(Eg) in eV
Pure PVA
PVA + 1 wt CuO
PVA + 2 wt CuO
PVA + 3 wt CuO
PVA + 4 wt CuO
PVA + 5 wt CuO
4.97
4.88
4.25
4.00
3.90
3.03