*2.4. Characterization*

The samples were characterized by various analytical techniques, as mentioned below.

#### 2.4.1. FTIR Spectroscopic Studies

For the FTIR spectroscopic studies, the Agilent carrying 630 spectrometers was used to conduct the FTIR analysis of the poly(*o*-anisidine)/BaSO4 nanocomposites. The sample discs were prepared by using KBr powder and dried to remove any moisture at 80 ◦C in an electric oven. Then, the samples were analyzed by the FTIR spectrometer in the wavenumber range of 400–4000 cm<sup>−</sup>1.
