Synthesis, characterization and antimicrobial properties of silver phthalocyanine-silver (AgPc-Ag) supported on aminosilane-modified silicate

Abstract

Organic–inorganic composite antibacterial materials based on AgPc/Ag and aminosilane-modified silicate (Ormosil) were prepared by sol-gel processes and an in situ reduction method. The physical and chemical properties of AgPc, Pc-Ormosil and AgPc-Ormosil/Ag composites were analyzed by SEM, XRD, NMR and XPS spectroscopy. As a result, Ag nanoparticles were bonded and chelated in Pc-Ormosil matrix. The morphology analysis of SEM showed that the AgNPs in the Pc-Ormosil matrix were spherical and uniformly distributed, with a size of about 5–10 nm. These NMR and XPS results indicated that the AgNPs were coordinated with Pc (N–Ag–N) and chelated with Ormosil (–CH2NH…Ag and Si–OH…Ag) to form a AgPc-Ormosil/Ag composite. The antibacterial effects of AgPc-Ormosil/Ag composites on Gram-negative Pseudomonas aeruginosa and Escherichia coli, and Gram-positive Staphylococcus aureus and Bacillus subtilis were evaluated by inhibiting ring, minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC) and plate counting, and excellent antibacterial properties were obtained.