Green synthesized ZnO NPs from bamboo stem: optical, structural, morphological, and chemical studies

Abstract Bamboo is rich in nutrients, bioactive compounds, and antioxidants. Phenols, flavonoids, and vitamins C and E are the primary antioxidants present. In this report, pristine ZnO NPs were prepared by a green co-precipitation route using a bamboo stem extract. The Rietveld refined X-ray diffraction pattern confirmed pure phase formation of ZnO NPs and having a wurtzite hexagonal structure with space group = P 63 mc . The William˗Hall method was used to calculate the crystallite size which was found to be 35.38 nm with a compressive strain of −1.43 × 10 −3 . Scanning electron microscopy confirmed the mushroom-like surface morphology. Fourier transform infrared spectroscopy study, antisymmetric stretching confirms Zn–O bonding. A strong absorption peak around 380 nm was observed in ultra-violet spectra and a broad emission band at ∼389.5 nm (3.18 eV) was confirmed by photo-luminescence spectroscopy.