**4. Conclusions**

The current study provides significant results regarding the antibacterial and conductivity properties of POA/BaSO4 nanocomposites. Poly(*o*-anisidine)/BaSO4 nanocomposites were synthesized by the oxidative polymerization of *o*-anisidine and variable percentages of BaSO4 nanoparticles. The nanocomposites were tested by using different characterization techniques, i.e., FTIR, UV, and conductivity and disc-diffusion methods. The FTIR results show the strong communication among poly(*o*-anisidine) and BaSO4 nanoparticles, and the UV-visible results indicate good absorption behavior. Moreover, the POA/BaSO4 nanocomposites exhibited significant bactericidal potential against *Pseudomonas aeruginosa* and *Staphylococcus aureus*, and a tunable electrical conductivity feature. Therefore, the versatile properties of poly(*o*-anisidine)/BaSO4 nanocomposites identify these materials as future candidates for biomedical, electrical device, and sensor applications.

**Author Contributions:** The manuscript was written with the contributions of all authors. All authors have approved the final version of the manuscript.

**Funding:** This research was funded by Princess Nourah bint Abdulrahman University Researchers Supporting Project number (PNURSP2022R134), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia. The authors would like to thank the Deanship of Scientific Research at Umm Al-Qura University for supporting this work by grant code (22UQU4331312DSR06). The authors extend their appreciation to the Research Center at AlMaarefa University for funding this work under TUMA project agreement number (TUMA-2021-22).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data will be available on request.

**Acknowledgments:** This research was funded by Princess Nourah bint Abdulrahman University Researchers Supporting Project number (PNURSP2022R134), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia. The authors would like to thank the Deanship of Scientific Research at Umm Al-Qura University for supporting this work by grant code (22UQU4331312DSR06). The authors extend their appreciation to the Research Center at AlMaarefa University for funding this work under TUMA project agreement number (TUMA-2021-22).

**Conflicts of Interest:** The authors declare no conflict of interest.
