Optics and Photonics Society of Iran

In this work, the optical sensing behavior of graphene oxide/Au nanocomposite films before and after thermal annealing are investigated. These films are prepared by depositing graphene oxide and gold nanoparticles from a colloidal solution on glass substrates using centrifuge deposition technique. The films are characterized using the UV-visible absorption spectroscopy and X-ray diffraction analysis. The behavior of UV-visible absorption spectra of the films in the wavelength range 530-540 nm clearly shows formation of the nanocomposite. The films' X-ray diffraction patterns indicate that the gold nanoparticles are distributed between graphene oxide planes and the graphene oxide structural properties are modified. The optical sensing behavior of the film is studied under cw laser irradiation at 532 nm. The results show that the optical sensing response of the annealed film is improved in compared to the unannealed film due to presence gold nanoparticles in the nanocomposite