Nanotextured surfaces with iron oxide and titania for antibacterial and water purification applications via supersonic spraying

Chanwoo Park, Taegun Kim, Jaewoo Seol, Bhavana Joshi, Ali Aldalbahi, Joo Hyun Hong, Seongpil An, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Microbial infections pose a significant threat to public health worldwide. Antibacterial treatments are required to prevent bacterial contamination and protect public health. Herein we supersonically sprayed iron and titania NPs which are nontoxic earth-abundant and low-cost antibacterial materials to fabricate Fe2O3/TiO2-based antibacterial hybrid films capable of inhibiting E. coli by up to 100% upon ultraviolet (UV) light irradiation. The supersonically sprayed iron and titania NPs were annealed to prepare Fe2O3/TiO2-based metal oxide nanosheets. The photomobilized electrons and holes generated superoxide anions and hydroxyl radicals respectively via reduction and oxidation. The bare Fe2O3-based and hybrid Fe2O3/TiO2-based films were photoactivated via visible and UV lights and exhibited E. coli inhibition rates of 42.1% and 99.9% respectively. In addition the hybrid Fe2O3/TiO2-based films were superhydrophilic which promoted the strong adhesion of bacteria-contaminated aerosols between the surrounding atmosphere and films. The water-purification capability of the films was confirmed by the efficient photodegradation of a methylene blue solution upon UV irradiation.

Original languageEnglish
Article number158376
JournalApplied Surface Science
Publication statusPublished - 2023 Dec 15

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) NRF-2020R1A5A1018153 and 2022M3J1A106422611. The authors acknowledge King Saud University Riyadh Saudi Arabia for funding this work through Researchers Supporting Project number (RSP2023R30).

Publisher Copyright:
© 2023 Elsevier B.V.


  • Aerosol deposition
  • Antibacterial activity
  • Iron oxide nanosheets
  • Supersonic cold spraying
  • Water purification

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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