UV-absorbing additives have recently been demonstrated to be effective interfacial modifiers that simultaneously enhance the UV stability and crystallization of halide perovskite.However,the underlying mechanisms conc...UV-absorbing additives have recently been demonstrated to be effective interfacial modifiers that simultaneously enhance the UV stability and crystallization of halide perovskite.However,the underlying mechanisms concerning UV absorption,defect passivation,and efficacy optimization of these additives remain unresolved.Herein,two UV tautomeric absorbers(UV320 and UV327)are selected as defect-passivators for perovskites.The keto-enol tautomeric evolution processes and corresponding defect passivation performance/mechanism of both the original molecules and their tautomers are thoroughly compared and elucidated through experimental characterizations and density functional theory calculations.The additional carbonyl(-C=O)groups generated through the keto-enol tautomeric process triggered by the Cl atom in UV327 ultimately provide superior chemical coordination and enhanced defect-passivation capability compared to the original counterparts.Moreover,the versatility of K-UV327 is further demonstrated by its optimization of SnO_(2)film quality,interfacial energy band alignment,charge extraction efficiency,and defect state suppression.The photodetector optimized by UV327's tautomer achieves an ultralow dark current density of 3.22×10^(-10)A cm^(-2),an enhanced linear dynamic range of 94.14 d B,and a fast response time of 23.35/26.19μs.Notably,unencapsulated devices maintain a stable response at 3900 Hz following 300 h exposure to 40%±5%relative humidity and 30 h UV irradiation.展开更多
Myocardial ischemia(MI)is a pathophysiological condition in which the myocardium is unable to maintain normal cardiac function due to insufficient coronary artery blood and oxygen supply,as well as abnormal myocardial...Myocardial ischemia(MI)is a pathophysiological condition in which the myocardium is unable to maintain normal cardiac function due to insufficient coronary artery blood and oxygen supply,as well as abnormal myocardial energy metabolism[1].Ginsenoside Rbi(Rbi),one of the most abundant natural ingredients in ginseng and Panax notoginseng,has been proven to protect the heart from MI/reperfusion injury(RI)[2].展开更多
A highly sensitive in-situ turbidity sensor with the low power consumption was proposed and evaluated in this study. To meet the practical requirements of the in-situ detection, we have designed the light scattering p...A highly sensitive in-situ turbidity sensor with the low power consumption was proposed and evaluated in this study. To meet the practical requirements of the in-situ detection, we have designed the light scattering path, watertight mechanical structure, and ultra-weak scattering light detecting method. Experiments showed that the sensor had a sensitivity of 0.0076 FTU with the concentration range of 0 - 25 FTU and the R-square of 0.9999. The sensor could withstand the water pressure in depth of 1000m and had the low power consumption in the active mode 10.4mA, sleep mode 65 pA with a supply voltage of 8.4V. Southern China Sea buoy experiments indicated that the sensor could work well in the actual in-situ environment. In comparison with sensors of other companies, our sensor had relatively more comprehensive performance.展开更多
基金the financial support from Xingdian Creative Industry Talent Project of Yunnan Province(No.XDYC-CYCX-2024-0025)Science and Technology Special Projects of Southwest United Graduate School and Innovative Team of Yunnan Province。
文摘UV-absorbing additives have recently been demonstrated to be effective interfacial modifiers that simultaneously enhance the UV stability and crystallization of halide perovskite.However,the underlying mechanisms concerning UV absorption,defect passivation,and efficacy optimization of these additives remain unresolved.Herein,two UV tautomeric absorbers(UV320 and UV327)are selected as defect-passivators for perovskites.The keto-enol tautomeric evolution processes and corresponding defect passivation performance/mechanism of both the original molecules and their tautomers are thoroughly compared and elucidated through experimental characterizations and density functional theory calculations.The additional carbonyl(-C=O)groups generated through the keto-enol tautomeric process triggered by the Cl atom in UV327 ultimately provide superior chemical coordination and enhanced defect-passivation capability compared to the original counterparts.Moreover,the versatility of K-UV327 is further demonstrated by its optimization of SnO_(2)film quality,interfacial energy band alignment,charge extraction efficiency,and defect state suppression.The photodetector optimized by UV327's tautomer achieves an ultralow dark current density of 3.22×10^(-10)A cm^(-2),an enhanced linear dynamic range of 94.14 d B,and a fast response time of 23.35/26.19μs.Notably,unencapsulated devices maintain a stable response at 3900 Hz following 300 h exposure to 40%±5%relative humidity and 30 h UV irradiation.
文摘Myocardial ischemia(MI)is a pathophysiological condition in which the myocardium is unable to maintain normal cardiac function due to insufficient coronary artery blood and oxygen supply,as well as abnormal myocardial energy metabolism[1].Ginsenoside Rbi(Rbi),one of the most abundant natural ingredients in ginseng and Panax notoginseng,has been proven to protect the heart from MI/reperfusion injury(RI)[2].
文摘A highly sensitive in-situ turbidity sensor with the low power consumption was proposed and evaluated in this study. To meet the practical requirements of the in-situ detection, we have designed the light scattering path, watertight mechanical structure, and ultra-weak scattering light detecting method. Experiments showed that the sensor had a sensitivity of 0.0076 FTU with the concentration range of 0 - 25 FTU and the R-square of 0.9999. The sensor could withstand the water pressure in depth of 1000m and had the low power consumption in the active mode 10.4mA, sleep mode 65 pA with a supply voltage of 8.4V. Southern China Sea buoy experiments indicated that the sensor could work well in the actual in-situ environment. In comparison with sensors of other companies, our sensor had relatively more comprehensive performance.
