Interfacial engineering of Bi2S3/Ti3C2Tx MXene based on work function for rapid photo-excited bacteria-killing

Jianfang Li, Zhaoyang Li, Xiangmei Liu (), Changyi Li, Yufeng Zheng, Kelvin Wai Kwok Yeung, Zhenduo Cui, Yanqin Liang, Shengli Zhu, Wenbin Hu, Yajun Qi, Tianjin Zhang, Xianbao Wang and Shuilin Wu ()
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Jianfang Li: Tianjin University
Zhaoyang Li: Tianjin University
Xiangmei Liu: Hubei University
Changyi Li: Tianjin Medical University
Yufeng Zheng: Peking University
Kelvin Wai Kwok Yeung: The University of Hong Kong
Zhenduo Cui: Tianjin University
Yanqin Liang: Tianjin University
Shengli Zhu: Tianjin University
Wenbin Hu: Tianjin University
Yajun Qi: Hubei University
Tianjin Zhang: Hubei University
Xianbao Wang: Hubei University
Shuilin Wu: Tianjin University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract In view of increasing drug resistance, ecofriendly photoelectrical materials are promising alternatives to antibiotics. Here we design an interfacial Schottky junction of Bi2S3/Ti3C2Tx resulting from the contact potential difference between Ti3C2Tx and Bi2S3. The different work functions induce the formation of a local electrophilic/nucleophilic region. The self-driven charge transfer across the interface increases the local electron density on Ti3C2Tx. The formed Schottky barrier inhibits the backflow of electrons and boosts the charge transfer and separation. The photocatalytic activity of Bi2S3/Ti3C2Tx intensively improved the amount of reactive oxygen species under 808 nm near-infrared radiation. They kill 99.86% of Staphylococcus aureus and 99.92% of Escherichia coli with the assistance of hyperthermia within 10 min. We propose the theory of interfacial engineering based on work function and accordingly design the ecofriendly photoresponsive Schottky junction using two kinds of components with different work functions to effectively eradicate bacterial infection.

Date: 2021
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DOI: 10.1038/s41467-021-21435-6

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