Among semiconductors, TiO2 with its

Among semiconductors, TiO2 with its distinct advantagesof cheapness and commercial availability, antibacterial andhydrophilic ability has attracted extensive attention [1–3]. Both ofthe hydrophilic and antibacterial mechanisms were mainly basedon TiO2 photocatalytic ability. These properties show good performance when TiO2 film is irradiated with light [4–6]. However,when the material is stored in a dark place, TiO2 material will loseits’ hydrophilic and antibacterial ability. Ag is another antibacterial material that has been studied widely and light is needlessin the process of sterilizing different microorganisms. Apart fromthe antibacterial activity, doped silver nanoparticles can improvephotocatalytic ability of TiO2. In recent years, many researchershave investigated the effect ofAg nanoparticles on antibacterial andhydrophilic activity of TiO2 [7–15]. It is found that Ag–TiO2 material exhibit good antibacterial and hydrophilic property. Sol–gelprocess is a conventional method to prepare composite Ag–TiO2.It’s a better way than photo reduction for the purpose of reserveof smaller silver nanoparticles within TiO2 materials. Usually,required volume of AgNO3 solution is added to the existed TiO2sol to prepare the composite material in this method, which meansa dilute sol is used.