investigation of structural, photo-luminescence and self-cleaning properties of thin layers of go-zno and go, go-ag and composite bilayer of go-zno/go-ag prepared by spray pyrolysis method

The synthesis of graphene oxide-zinc oxide, graphene oxide- silver, graphene oxide thin layers, and graphene oxide-zinc/graphene oxide-silver bilayer was done using a method called spray pyrolysis. characterization of the synthesized layers was done by x ray diffraction, transmission electron microscope, atomic force microscope, photo-luminescence, ftir and bet analyses. based on the tem images, the given nano-composites are formed and go can be a suitable platform for the growth of silver and zno nano-particles and prevents their accumulation. according to the afm images, go-zno/go-ag sample has the lowest roughness. pl spectrum showed a broad emission peak for go-ag layer at a wavelength of approximately 550 nm, which is consistent with the reported band gap of 3.6ev. from bet results, the surface area was obtained 4 m2g-1 and 14 m2g-1, for go and go-ag samples respectively which were greater than the similar work. the pore diameter of go-zno sample was obtained equal to 16.5 nm, indicating the superiority of the meso-holes in go-zno sample. also, the surface area of go-zno/go-ag bilayer was around 3.6 times larger than the surface area of zno. the contact angles of droplet with the surface in go, go-ag, go-zno, go-zno/go-ag samples are 55.02, 60.24, 31.28, 56.35, respectively.