Phase-Dependent MoS2Nanoflowers for Light-Driven Antibacterial Application

Chinmaya Mutalik, Dyah Ika Krisnawati, Shivaraj B. Patil, Muhamad Khafid, Didik Susetiyanto Atmojo, Puguh Santoso, Ssu Chiao Lu, Di Yan Wang, Tsung Rong Kuo

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The metallic phase of 1T-MoS2 nanoflowers (NFs) and the semiconducting phase of 2H-MoS2 NFs were prepared by a facile solvothermal and combustion method. The antibacterial activities, reactive oxygen species (ROS) generation, and light-driven antibacterial mechanism of metallic 1T-MoS2 NFs and semiconducting 2H-MoS2 NFs were demonstrated with the bacterium Escherichia coli (E. coli) under light irradiation. Results of the bacterial growth curve and ROS generation analyses revealed higher light-driven antibacterial activity of metallic 1T-MoS2 NFs compared to semiconducting 2H-MoS2 NFs. Electron paramagnetic resonance (EPR) spectroscopy demonstrated that the ROS of the superoxide anion radical-O2- was generated due to the incubation of 1T-MoS2 NFs and E. coli with light irradiation. Furthermore, E. coli incubated with metallic 1T-MoS2 NFs exhibited significant damage to the bacterial cell walls, complete bacterial destruction, and abnormal elongation after light irradiation. The light-driven antibacterial mechanism of metallic 1T-MoS2 NFs was examined, and we found that, under light irradiation, photoinduced electrons were generated by metallic 1T-MoS2 NFs, and then the photoinduced electrons reacted with oxygen to generate superoxide anion radical which induced bacterial death. For semiconducting 2H-MoS2 NFs, photoinduced electrons and holes rapidly recombined resulting in a decrease in ROS generation which diminished the light-driven antibacterial activity.

Original languageEnglish
Pages (from-to)7904-7912
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume9
Issue number23
DOIs
Publication statusPublished - Jun 14 2021

Keywords

  • Metallic 1T-MoS
  • Photoactivity
  • Reactive oxygen species
  • Semiconducting 2H-MoS
  • Superoxide anion radical

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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