Magnetically separable MXene@Fe3O4/Au/PDA nanosheets with photothermal-magnetolytic coupling antibacterial performance

Guanghui Liu, Qingshan Xiong, Yunqi Xu, Qunling Fang, Ken Cham Fai Leung*, Min Sang, Shouhu Xuan*, Lingyun Hao*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

35 Citations (Scopus)


Harmful bacteria are common substances in water that endanger human health, so it is urgent to establish a simple system that can tackle these hazardous substances simultaneously. In this work, a novel magnetic MXene@Fe3O4/Au/polydopamine (PDA) nanosheet with excellent photothermal-magnetolytic coupling antibacterial performance is developed. MXene, Au and polydopamine all have good photothermal properties, so the photothermal conversion efficiency of the MXene@Fe3O4/Au/PDA nanosheet reaches as high as 48.7%. After 6 min of 808 nm laser irradiation, the MXene@Fe3O4/Au/PDA nanosheets (120 μg·mL−1) can achieve nearly 100% antibacterial effect against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). In comparison to the sole photothermal treatment, the nanosheet at lower concentration (80 μg·mL−1) also exhibit stronger antibacterial properties against both Gram-negative and Gram-positive bacteria during the photothermal-magnetic coupling treatment. The result is mainly because the heat generated by the photothermal effect of the nanosheet is directly transferred to the cell membrane, and the edge of the nanosheet cuts the cytomembrane similar to a magnetic “hot nanoblade”, resulting in subsequent shrinkage, deformation and even rupture.

Original languageEnglish
Article number153125
JournalApplied Surface Science
Publication statusPublished - 15 Jul 2022

Scopus Subject Areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

User-Defined Keywords

  • Antibacterial
  • FeO
  • MXene
  • Near-infrared
  • Polydopamine


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