Effect of Phosphoric Acid Concentration on the Optical Properties of Partially Phosphorylated PVA Complexes

Table 1

Optical parameters for pure PVA and PPVA films.

Sample (mole ratio)	Optical band gap,; (eV)	Absorption peak; (nm)
Pure PVA	5.45	277
0.1	5.67	275
0.2	5.75	273
0.3	5.77	272
0.4	5.79	271
0.5	5.83	270