Characterization of silver nanoparticles synthesized on titanium dioxide fine particles

Abstract

Silver nanoparticles with a narrow size distribution were synthesized over the surface of two different commercial TiO(2) particles using a simple aqueous reduction method. The reducing agent used was NaBH(4); different molar ratios TiO(2):Ag were also used. The nanocomposites thus prepared were characterized using transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), dynamic light scattering (DLS) and UV-visible (UV-vis) absorption spectroscopy; the antibacterial activity was assessed using the standard microdilution method, determining the minimum inhibitory concentration (MIC) according to the National Committee for Clinical Laboratory Standards. From the microscopy studies (TEM and STEM) we observed that the silver nanoparticles are homogeneously distributed over the surface of TiO(2) particles and that the TiO(2):Ag molar ratio plays an important role. We used three different TiO(2)Ag molar ratios and the size of the silver nanoparticles is 10, 20 and 80 nm, respectively. It was found that the antibacterial activity of the nanocomposites increases considerably comparing with separated silver nanoparticles and TiO(2) particles.

Large scale photochemical synthesis of M@TiO2 nanocomposites (M = Ag, Pd, Au, Pt) and their optical properties, CO oxidation performance, and antibacterial effect

“…8(c)). It has previously been found [8,9,46,47] that silver-doped titania has better antibacterial effect than pure silver particles, only when the loading is very high, about 5-70 times more than we used here. In fact, lowering the concentration of the nanocomposite to 5 μg/mL, also has a significant effect on bacterial growth.…”

Biosynthesis of silver nanoparticles from the marine seaweed Sargassum wightii and their antibacterial activity against some human pathogens

“…Silver is known for its antibacterial properties and has been used for years in the medical field for antimicrobial applications and even has shown to prevent HIV binding to host cells (Nino-Martinez et al 2008;Alt et al 2004;Russel and Hugo 1994;Lee et al 2007;Jeong et al 2005). In addition, silver has been used in water and air filters to eliminate microorganisms (Chou et al 2005, Jin et al 2007).…”

Antibacterial potential of silver nanoparticles against isolated urinary tract infectious bacterial pathogens

“…Urinary tract infections occur more frequently in females (63%) than in males (Schaeffer et al 2001). Silver is known for its antimicrobial properties and has been used for years in the medical field for antimicrobial applications and even has shown to prevent HIV binding to host cells (Nino-Martinez et al 2008;Alt et al 2004;Lee et al 2007). Additionally, silver has been used in water and air filtration to eliminate microorganisms (Chou et al 2005).…”