A facile method for synthesis of silver and Fe3O4 reusable hierarchical nanocomposite for antibacterial applications

Peng Qin, Chao Chen, Yibing Wang, Liting Zhang, Ping Wang

Research output: Contribution to journalArticle

2 Scopus citations


Silver (Ag) nanoparticles are effective disinfectants that offer a broad-spectrum of antibacterial activities. However, concerns about releasing Ag-based disinfectants into environment have significantly limited their large-scale applications. In this study, a facile and environmentally benign method was developed to grow Ag nanoparticles on polydopamine-functionalized Fe3O4 particles, forming a hierarchical Fe3O4-polydopamine-Ag nanocomposite. The polydopamine layer was coated on the surface of the Fe3O4 particles via self-polymerization under ambient conditions; it subsequently facilitated the formation of Ag nanoparticles from [Ag(NH3)2]+ and provided anchoring sites for the immobilization of the Ag nanoparticles. The nanocomposite presented excellent antibacterial activities against both Gram-negative (Escherichia coli) and Gram-positive(Staphylococcus aureus) bacteria, with respective minimum inhibitory concentration as 40 and 60 μg/mL, respectively. Furthermore, the nanocomposite can be separated and recovered magnetically, avoiding environmental contamination and enabling particle reuse. Recycling tests showed that over 60% of the original antibacterial activity of the particles was retained after 6 cycles of reuse.

Original languageEnglish (US)
Pages (from-to)9350-9355
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Issue number12
StatePublished - Jan 1 2017


  • Antibacterial materials
  • Magnetic materials
  • Nanocomposite
  • Silver nanoparticle
  • Water contamination

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