Magnetic nanohybrids loaded with bimetal core-shell-shell nanorods for bacteria capture, separation, and near-infrared photothermal treatment

Chemistry : a European Journal
Bo HuJian-Hua Wang

Abstract

A novel antimicrobial nanohybrid based on near-infrared (NIR) photothermal conversion is designed for bacteria capture, separation, and sterilization (killing). Positively charged magnetic reduced graphene oxide with modification by polyethylenimine (rGO-Fe3 O4 -PEI) is prepared and then loaded with core-shell-shell Au-Ag-Au nanorods to construct the nanohybrid rGO-Fe3 O4 -Au-Ag-Au. NIR laser irradiation melts the outer Au shell and exposes the inner Ag shell, which facilitates controlled release of the silver shell. The nanohybrids combine physical photothermal sterilization as a result of the outer Au shell with the antibacterial effect of the inner Ag shell. In addition, the nanohybrid exhibits high heat conductivity because of the rGO and rapid magnetic-separation capability that is attributable to Fe3 O4 . The nanohybrid provides a significant improvement of bactericidal efficiency with respect to bare Au-Ag-Au nanorods and facilitates the isolation of bacteria from sample matrixes. A concentration of 25 μg mL(-1) of nanohybrid causes 100 % capture and separation of Escherichia coli O157:H7 (1×10(8) cfu mL(-1) ) from an aqueous medium in 10 min. In addition, it causes a 22 °C temperature rise for the surrounding solution u...Continue Reading

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Citations

Nov 26, 2015·Chemistry : a European Journal·Yuanyuan CaoYapei Wang
Jul 7, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Shiming ZhangYapei Wang
Oct 28, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Fatima HalouaneSabine Szunerits
Apr 8, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Milica BudimirRabah Boukherroub
Apr 7, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Xinghang JiaChen Wang
Apr 14, 2020·Materials Science & Engineering. C, Materials for Biological Applications·Lei JiangWei Shao
Nov 14, 2020·Advanced Healthcare Materials·Guijian GuanMing-Yong Han
Mar 13, 2017·ACS Biomaterials Science & Engineering·Shuai ChenJian-Hua Wang
Sep 28, 2021·Chemical Reviews·Jiapeng ZhengJianfang Wang

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