Antimicrobial resistance(AMR)has disturbed global public health for many years.Reactive oxygen species(ROS)generation by photocatalysis was considered as an effective substance which can directly destroy cell structur...Antimicrobial resistance(AMR)has disturbed global public health for many years.Reactive oxygen species(ROS)generation by photocatalysis was considered as an effective substance which can directly destroy cell structures and DNA of bacterial.In this work,Ag cluster decorated BiO_(2-x)(Ag-BiO_(2-x))Ohmic-junction with strong built-in electric field was fabricated by photo-deposition strategy for efficient photocatalytic sterilization.The interfacial reaction-generated electric field in an Ag-BiO_(2-x)Ohmic-junction facilitates the transport and separation of photoelectron from BiO_(2-x)to Ag.The local surface plasmon resonance(LSPR)effect of Ag clusters can boost the composite's light absorption while preventing photogenerated carriers from recombining.Simultaneously,Ag clusters can act as a cocatalyst,with an optimal oxygenadsorption energy,promoting highly efficient molecular oxygen activation.As we expected,Ag-BiO_(2-x)Ohmicjunction displayed enhanced E.coli inactivation activity with 2 h under visible light irradiation.The EPR measurement and DFT calculation confirmed that the Ag clusters worked as ROS generation sites and provoked the generation of·O_(2)-and OH.This study provides an atomic insight on design Ohmic-junction photocatalyst for photocatalytic antibacterial.展开更多
ZnO micro-prisms are prepared on the p-type and n-type Si substrates, separately. The Ⅰ-Ⅴ curves analysed by AFM show that the interface junctions between the ZnO micro-prisms and the p-type substrate and between th...ZnO micro-prisms are prepared on the p-type and n-type Si substrates, separately. The Ⅰ-Ⅴ curves analysed by AFM show that the interface junctions between the ZnO micro-prisms and the p-type substrate and between the ZnO micro-prisms and the n-type Si substrate exhibit p-n junction behaviour and ohmic contuct behuviour, respectively. The formation of the p-n heterojunction and ohmic contact is ascribed to the intrinsic n-type conduction of ZnO material. Better field emission performance （lower onset voltage and larger emission current） is observed from an individual ZnO micro-prism grown on the n-type Si substrate. It is suggested that the n-Si/n-ZnO interracial ohmic contact benefits the electron emission; while the p-Si/n-ZnO interface heterojunction deteriorates the electron emission.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52070103)Henan Medical Science and Technology Research Project(Key Project of Provincial and Ministry Co-construction)(Nos.SBGJ202402048 and SBGJ202402045)Zhengzhou Basic Research and Applied Basic Research Project,Project(No.2024ZZJCYJ002)
文摘Antimicrobial resistance(AMR)has disturbed global public health for many years.Reactive oxygen species(ROS)generation by photocatalysis was considered as an effective substance which can directly destroy cell structures and DNA of bacterial.In this work,Ag cluster decorated BiO_(2-x)(Ag-BiO_(2-x))Ohmic-junction with strong built-in electric field was fabricated by photo-deposition strategy for efficient photocatalytic sterilization.The interfacial reaction-generated electric field in an Ag-BiO_(2-x)Ohmic-junction facilitates the transport and separation of photoelectron from BiO_(2-x)to Ag.The local surface plasmon resonance(LSPR)effect of Ag clusters can boost the composite's light absorption while preventing photogenerated carriers from recombining.Simultaneously,Ag clusters can act as a cocatalyst,with an optimal oxygenadsorption energy,promoting highly efficient molecular oxygen activation.As we expected,Ag-BiO_(2-x)Ohmicjunction displayed enhanced E.coli inactivation activity with 2 h under visible light irradiation.The EPR measurement and DFT calculation confirmed that the Ag clusters worked as ROS generation sites and provoked the generation of·O_(2)-and OH.This study provides an atomic insight on design Ohmic-junction photocatalyst for photocatalytic antibacterial.
文摘ZnO micro-prisms are prepared on the p-type and n-type Si substrates, separately. The Ⅰ-Ⅴ curves analysed by AFM show that the interface junctions between the ZnO micro-prisms and the p-type substrate and between the ZnO micro-prisms and the n-type Si substrate exhibit p-n junction behaviour and ohmic contuct behuviour, respectively. The formation of the p-n heterojunction and ohmic contact is ascribed to the intrinsic n-type conduction of ZnO material. Better field emission performance （lower onset voltage and larger emission current） is observed from an individual ZnO micro-prism grown on the n-type Si substrate. It is suggested that the n-Si/n-ZnO interracial ohmic contact benefits the electron emission; while the p-Si/n-ZnO interface heterojunction deteriorates the electron emission.
