Synthesis and antibacterial activity of a silver nanoparticle/silver titanium phosphate–nanocomposite nanobelt thin film formed on a titanium plate

• Published in: Thin solid films 2017-04, Vol.628, p.184-189
• Main Authors: Yada, Mitsunori, Inoue, Yuko, Morita, Tomohiro, Imamura, Shintaro, Torikai, Toshio, Watari, Takanori
• Format: Article
• Language: English
• Subjects: Antibacterial activity; Methicillin-resistant Staphylococcus aureus; Silver; Thin film; Titanium phosphate
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2017.03.013

A silver nanoparticle/silver titanium phosphate–nanocomposite nanobelt thin film was synthesized on a titanium plate by Ag+ ion exchange treatment of a titanium phosphate (Ti2O3(H2PO4)2·2H2O) nanobelt thin film. Silver nanoparticles with sizes ranging from several nanometers to a few dozen nanometers were regioselectively deposited along the edges of the nanobelts to form the nanocomposite. The coexisting anions in the solution played a crucial role in the Ag+ ion exchange reaction. In the presence of CH3COO− anions, Ag+ ions were intercalated into the titanium phosphate nanobelts through ion exchange between Ag+ and the H+ in the H2PO4 group of Ti2O3(H2PO4)2·2H2O, along with an accompanying change in the crystal structure of titanium phosphate. The silver nanoparticle/silver titanium phosphate–nanocomposite nanobelt thin film showed excellent antibacterial activity against methicillin-resistant Staphylococcus aureus, although the titanium phosphate nanobelt thin film possessed no antibacterial activity. •Ag nanoparticle/silver titanium phosphate–nanocomposite nanobelt thin film was synthesized.•Ag nanoparticles were regioselectively deposited along the edges of the nanobelts.•The nanocomposite nanobelt thin film showed excellent antibacterial activity against MRSA.