Cinnamon-based rapid biosynthesis of silver nanoparticles; its characterization and antibacterial properties

Abstract

The development of nanotechnology is generating interest of researchers towards the alternative synthesis procedures of metal nanoparticles that may be employed in various applications like drug delivery, photo-electrochemical devices, diagnostic techniques, antimicrobial sanitizers, sunscreens, single-electron transistors, nano-engineered solar cells, etc. Thus, green synthesis of metal nanoparticles is becoming an attractive method for obtaining particles with nano-scale. The biosynthesized AgNPs were characterized using UV–Visible spectroscopy, X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and energy-dispersive X-ray analysis (EDX). The UV–Visible spectrum showed a characteristic absorption peak for Ag at around 420–440 nm with optical bandgaps of about 3.42 eV–3.33 eV of AgNPs. XRD patterns at (111), (020), (022), (131), and (222) lattice planes depicted the production of face-centered cubic silver nano-structure with approximate crystal size ranges from ≈20 to 50 nm by Scherrer’s formula. The FTIR data indicated the presence of active biomolecules responsible for stabilization in the AgNPs structure. We reported the antibacterial properties of silver nanoparticles (AgNPs) derived from cinnamon bark extract against Salmonella typhimurium, Pseudomonas aeruginosa, Staphylococcus aureus, and Escherichia coli. This study on AgNPs might be a promising approach suggesting alternative treatment methods against pathogenic bacteria in the field of medicine.