Antibacterial Property of Ag/Al(OH)3 Porous Nanocomposite Film

Abstract

Recently, a great deal of attention has been dedicated to design and preparation of nanocomposite film with metallic layer because of their wide range of applications such as surface-enhanced Raman scattering, catalysis and chemical sensors and so on. There are many routes for fabricating composite film: self- assembly, electroless plating, layer by layer method, ultrasound irradiation and deposition method. In this study, metal nanoparticle with porous substrate was used to make nanocomposite fi]m. Pure AI plate was surface-modified by alkali solution to generate microporous aluminum hydroxide layer as a substrate. Sub- sequently, the surface-modified substrate was immersed in the solution composed of ethylene glycol, AgN03 and polyvinylpyrrolidone at 120oC which is known as polyol process for silver nanocomposite film. The scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray pho- toelectron spectroscopy (XPS) were employed to investigate the microstructure and surface chemical state of specimens. And the antibacterial property of the fabricated silver nanocomposite film was measured using E. coli bacteria. As the polyol process time is longer the formed Ag nanoparticles shows two dif- ferent growth behaviors. And the Ag nanoparticles dispersed sample shows the best antibacterial property among various sample conditions.