Impact of Rolled Graphene Oxide Grown on Polyaniline for Photodetection: Future Challenging Opto-Device

Rolled graphene oxide (roll-GO) with anew morphological properties than normal graphene is synthesized using modified Hummer. Then, the roll-GO/PANI composite is prepared through the adsorption of roll-GO on the surface of the PANI film, that performed through the oxidative polymerization method. The developed composite displays a small bandgap of 1.9 eV and shows a high optical property extends through a wide optical region from UV to IR regions. The chemical structure and function groups are confirmed using the XRD and FTIR. The roll-GO/PANI composite was investigated as a photodetector. The effects of different irradiation light conditions and the monochromatic wavelengths were tested through the measurements of the produced current density, J_ph. The optical photon response exhibited excellent light sensitivity of the photodetector. The J_ph enhanced highly under light (0.34 mA·cm⁻²) compared to dark conditions (0.007 mA·cm⁻²). J_ph reached 0.24, 0.23, 0.14, and 0.09 mA·cm⁻² under 340, 440, 540, and 730 nm, respectively. The photodetector detectivity (D) and photoresponsivity (R) are found to equal 0.45 × 10⁹ Jones and 2.25 mA·W⁻¹, respectively.