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(a) PXRD diffractograms of the pure protocatechuic acid, GO nanosheets, protocatechuic acid loaded on GO/Gd nanolayers (GAGPA) and gold nanoparticles coated on GAGPA nanocomposite (GAGPAu); (b) Raman spectra of GO nanosheets (A), protocatechuic acid loaded on GO/Gd nanolayers (GAGPA) (B) and gold nanoparticles coated on GAGPA nanocomposite (GAGPAu) (C).
