Fig. 4. (A) ATR-FTIR spectra of uncoated quartz plate (curve a), PDA coatings oxidized by 0.1 wt% (curve b), 0.2 wt% (curve c) and 0.5 wt% (curve d) SP (DA concentration was 1.0 wt%) for 30 min; (B) ATR-FTIR spectra of PDA coatings synthesized with 0.1 wt% (curve a), 0.2 wt% (curve b) and 0.5 wt% (curve c) DA (SP concentration was 0.5 wt%) for 30 min.
