Investigation of optical, structural, morphological and antimicrobial properties of carboxymethyl cellulose capped Ag-ZnO nanocomposites prepared by chemical and mechanical methods

摘要

This study reports on preparation and investigation of novel Ag-ZnO nanocomposites with antimicrobial activity. Carboxymethyl cellulose (CMC) capped Ag-ZnO nanoparticles (NPs) were synthesized by chemical (CD) and mechanical deposition (MD) of Ag NPs on ZnO NPs. The samples were investigated by UV-Vis spectroscopy, FTIR, XRD, DLS, SEM, EDX, WDXRF and TEM analyses. The antimicrobial activity was assessed against a wide range of pathogenic microorganisms in planktonic and adherent state. Ag-ZnO nanocomposites exhibited maximum 0.64 wt.% spherical Ag NPs deposited on hexagonal prism ZnO NPs with single surface plasmon absorption band ranging 398-424 nm. The mechanism for obtaining CMC capped Ag-ZnO NPs by chemical synthesis was proposed. Ag-ZnO nanocomposites yielded average crystallite size of 56.1-64 nm, mean effective diameter of 388-427 nm, polydispersity of 0.193-0.286, and a bimodal volume-weighted particle size distribution. All nanomaterials exhibited good antimicrobial activity against planktonic and biofilm growing bacteria. (C) 2016 Elsevier Inc. All rights reserved.