Acidic plant extracts to reduce the particle size of ZnO nanostructures biosynthesized with Brassica oleracea italica

R. Ángeles Sierra 1; M. Villanueva-Ibáñez1,*; R. González-Montes de Oca 1;
P.N. Olvera-Venegas 1; M.A. Hernández-Pérez 2; M.A. Flores-González 1.

1, Nanotechnology, new materials and systems for the health, industry and alternative energies/ Polytechnique University of Pachuca.

2, Departamento de Ingeniería en Metalurgia y Materiales. ESIQIE-Instituto Politécnico Nacional.

The properties of ceramic materials at the nanoscale have significantly increased their demand in different industrial sectors. Zinc oxide (ZnO) has many attractive properties, such as the direct wide bandgap (3.37 eV), good electrical characteristics, chemical stability, biocompatibility and antibacterial activity, which suggest a variety of possible practical applications. Different synthesis methods have been reported to prepare nanocrystalline zinc oxide; most of them require expensive high technology or depend on the use of toxic reducing agents. In this work, we report a simple ecofriendly synthesis to obtain zinc oxide nanomaterials from zinc acetate solutions using extracts of Brassica oleracea italica as reducing agent. Progress of the reaction has been monitored by UV-Vis spectroscopy where ZnO nanomaterials have a wavelength of maximum absorption of 350 nm. XRD pattern of synthesized nanostructures confirms the crystallinity with hexagonal structure. The addition of acid plant extracts to the as-obtained materials had a positive effect on the reduction of the original particle size (800 nm), SEM with EDS spectrum authenticated the presence of zinc oxide with particle sizes from 50 to 200 nm, maintaining stable colloidal solutions for more than one week. This work extends the possibilities of the use of biotechnological methods for other applications of technological interest.

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