In-situ monitoring of neurochemicals is of vital importance for the understanding of brain functions.Microelectrode-based photoelectrochemical(PEC) sensing has emerged as a promising tool for in vivo analysis since it...In-situ monitoring of neurochemicals is of vital importance for the understanding of brain functions.Microelectrode-based photoelectrochemical(PEC) sensing has emerged as a promising tool for in vivo analysis since it inherits the merits of both optical and electrochemical methods. However, the in-situ excitation of photoactive materials on the photoelectrode in living body is still a challenge because of limited tissue penetration depth of light. To circumvent this problem, we herein developed an implantable optical fiber(OF)-based microelectrode for in vivo PEC analysis. The working electrode was constructed by coating Au film as conducting layer and CdS@ZnO as photoactive material on a micron-sized OF,which was free of the limitation of light penetration in biological tissues. Further decoration of an antibiofouling layer on the surface made the sensor robust in biosamples. It was successfully applied for monitoring Cu^(2+) level in three different brain regions in the rat model of cerebral ischemia/reperfusion.展开更多
Carrier migration path and driving forces are two crucial factors for charge separation of heterojunction with efficient photoelectric response from the thermodynamic and kinetic perspectives,respectively.Constructing...Carrier migration path and driving forces are two crucial factors for charge separation of heterojunction with efficient photoelectric response from the thermodynamic and kinetic perspectives,respectively.Constructing the S-scheme heterojunction and achieving an efficient migration path for space charge separation have aroused great interest,while a thorough insight into tuning interfacial band bending for S-scheme heterojunction is absent.Herein,we report a class of Zn atom-doped CeO_(2)/g-C_(3)N_(4) heterostructure for achieving a new carrier migration path conversion from inferior type-II to advanced S-scheme.Zn-dependent volcano-type plot for Zn-CeO_(2) is established to tune the Fermi level of CeO_(2).The built-in electric field for carrier flow dynamics strengthens when coupling with g-C_(3)N_(4),which significantly boosts the photoelectric response.Based on the intrinsic enzymelike activity of Zn-CeO_(2),we further demonstrate that the Zn-CeO_(2)/g-C_(3)N_(4) S-scheme heterojunction can be explored for constructing a sensitive nanozymatic photoelectrochemical biosensor for the detection of acetylcholinesterase.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21625503 and 21906047)Natural Science Fund for Creative Research Groups of Hubei Province of China(No.2020CFA035)。
文摘In-situ monitoring of neurochemicals is of vital importance for the understanding of brain functions.Microelectrode-based photoelectrochemical(PEC) sensing has emerged as a promising tool for in vivo analysis since it inherits the merits of both optical and electrochemical methods. However, the in-situ excitation of photoactive materials on the photoelectrode in living body is still a challenge because of limited tissue penetration depth of light. To circumvent this problem, we herein developed an implantable optical fiber(OF)-based microelectrode for in vivo PEC analysis. The working electrode was constructed by coating Au film as conducting layer and CdS@ZnO as photoactive material on a micron-sized OF,which was free of the limitation of light penetration in biological tissues. Further decoration of an antibiofouling layer on the surface made the sensor robust in biosamples. It was successfully applied for monitoring Cu^(2+) level in three different brain regions in the rat model of cerebral ischemia/reperfusion.
基金supported by the National Natural Science Foundation of China(22104114)the Natural Science Foundation of Hubei Province(2021CFB518)+1 种基金the Fundamental Research Funds for the Central Universities(CCNU22JC006)the Program of Introducing Talents of Discipline to Universities of China(111 Program,B17019)。
文摘Carrier migration path and driving forces are two crucial factors for charge separation of heterojunction with efficient photoelectric response from the thermodynamic and kinetic perspectives,respectively.Constructing the S-scheme heterojunction and achieving an efficient migration path for space charge separation have aroused great interest,while a thorough insight into tuning interfacial band bending for S-scheme heterojunction is absent.Herein,we report a class of Zn atom-doped CeO_(2)/g-C_(3)N_(4) heterostructure for achieving a new carrier migration path conversion from inferior type-II to advanced S-scheme.Zn-dependent volcano-type plot for Zn-CeO_(2) is established to tune the Fermi level of CeO_(2).The built-in electric field for carrier flow dynamics strengthens when coupling with g-C_(3)N_(4),which significantly boosts the photoelectric response.Based on the intrinsic enzymelike activity of Zn-CeO_(2),we further demonstrate that the Zn-CeO_(2)/g-C_(3)N_(4) S-scheme heterojunction can be explored for constructing a sensitive nanozymatic photoelectrochemical biosensor for the detection of acetylcholinesterase.
