Synthesis of NIR Responsive NGQDs-Fe3O4@PPy Nanocomposite and Investigation of Its Photothermal Performance

Abstract

In this work, magnetic nitrogen doped graphene quantum dots iron oxide-polypyrrole (NGQDs-Fe3O4@PPy) ternary nanocomposite having perfect photothermal activity was synthesized. The chemical structure and morphological of the synthesized nanocomposites were characterized by ultraviolet -visible (UV-Vis) spectroscopy, Fourier transform infrared (FTIR), X-ray diffraction spectroscopy (XRD), high -resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS). Photothermal properties of the synthesized nanocomposites were examined at different laser power densities (1.5 - 2.5 W/cm2) in the near infrared (NIR) region (808 nm) using aqueous solutions of different concentrations (0.025 - 0.1 mg / mL). The maximum temperature (Tmax) of NGQDs-Fe3O4@PPy composite reached up to 54.3 degrees C and 83.1 degrees C under irradiation of the 808 nm NIR laser at 1.5 and 2.5 W/cm2 power density for 10 min at 0.1 mg/ml concentration. The synthesized NGQDs-Fe3O4@PPy triple nanocomposite with high photothermal performance and photothermal stability is thought to have an important potential for photothermal treatment applications.