Figure 6(a)in the paper[Chin.Phys.B 33074203(2024)]was incorrect due to editorial oversight.The correct figure is provided.This modification does not affect the result presented in the paper.
Photonic spin Hall effect(PSHE), as a novel physical effect in light–matter interaction, provides an effective metrological method for characterizing the tiny variation in refractive index(RI). In this work, we propo...Photonic spin Hall effect(PSHE), as a novel physical effect in light–matter interaction, provides an effective metrological method for characterizing the tiny variation in refractive index(RI). In this work, we propose a multi-functional PSHE sensor based on VO_(2), a material that can reveal the phase transition behavior. By applying thermal control, the mutual transformation into different phase states of VO_(2) can be realized, which contributes to the flexible switching between multiple RI sensing tasks. When VO_(2) is insulating, the ultrasensitive detection of glucose concentrations in human blood is achieved. When VO_(2) is in a mixed phase, the structure can be designed to distinguish between the normal cells and cancer cells through no-label and real-time monitoring. When VO_(2) is metallic, the proposed PSHE sensor can act as an RI indicator for gas analytes. Compared with other multi-functional sensing devices with the complex structures, our design consists of only one analyte and two VO_(2) layers, which is very simple and elegant. Therefore, the proposed VO_(2)-based PSHE sensor has outstanding advantages such as small size, high sensitivity, no-label, and real-time detection, providing a new approach for investigating tunable multi-functional sensors.展开更多
A kind of fluorescent sensing coating was prepared for monitoring corrosion of aluminum alloys by incorporating phenylfluorone(PF) into acrylic paint as sensing material. The fluorescent dye PF reacts with aluminum io...A kind of fluorescent sensing coating was prepared for monitoring corrosion of aluminum alloys by incorporating phenylfluorone(PF) into acrylic paint as sensing material. The fluorescent dye PF reacts with aluminum ions on corroded aluminum substrate to occur fluorescence quenching observed in UV light. This paint system is sensitive to underlying corrosion processes through reacting with the Al3+ produced by anodic reaction accompanying corrosion. After a certain time, when the samples of Al alloy 2024 coated with PF-acrylic paint were immersed in 1 mol/L NaCl solution, fluorescence quenching spots can be seen with unaided eyes. With the development of corrosion process, the size of fluorescence quenching spots increases. Active corrosion areas on the sample surface were found under the fluorescence quenching spots by optical microscope. The corrosion areas can be observed more clearly by SEM, and many pits are found. This suggests that the fluorescence quenching spots are the sites of produced Al3+ by the anodic reaction of the local attack of the coated Al alloy substrate in the chloride solution and the corrosion process of the coated Al alloy can be monitored on-line by the sensing coating. The sensitivity of this coating system for detection of anodic reaction associated with corrosion was determined by applying constant charge current and measuring the charge, at which fluorescence quenching is detected in the coating with unaided eyes. Visual observation of coated samples can detect fluorescence change resulting from a charge corresponding to an equivalent hemispherical pit with approximate depth of 50 μm.展开更多
Semiconductor metal oxides with narrow bandgap have emerged as a promising platform for photoelectrochemical reactions,yet their photoelectron-induced photocorrosion effect has been a limitation for their wider applic...Semiconductor metal oxides with narrow bandgap have emerged as a promising platform for photoelectrochemical reactions,yet their photoelectron-induced photocorrosion effect has been a limitation for their wider applications.Understanding the conversion processes concomitant with photoelectrochemical reaction at the electrode-electrolyte interface plays a crucial role in revealing the corrosion mechanisms and advancing the development of efficient photocathodes.However,accurately and in situ tracking these dynamic chemical events remains a great challenge due to the fact that reaction processes occur at nanoscale interfaces.Here,we track the electrochemical growth and conversion of copper nanostructures at interface by the evanescent field of the surface plasmon wave by using a gold-coated optical fiber as an electrochemical electrode and light sensing probe.The results exhibit correlation between redox processes of copper species and plasmonic resonances.Furthermore,in situ fiber-optic detection reveals the photocorrosion dynamics under photoelectrochemical reaction,including photoelectron-induced self-reduction of copper oxide and self-oxidation of cuprous oxide.These demonstrations facilitate not only the diagnosis for the health condition of photocathode nanomaterial,but also the understanding of the underlying reaction mechanism,and thus are potentially crucial for advancing the development of highly efficient photocathodes in future energy applications.展开更多
A multi-functional solar and skylight spectrophotometer has been developed for the study of atmospheric constituents and aerosols. The instrument and its performance are described. Due to telescope structure and lock-...A multi-functional solar and skylight spectrophotometer has been developed for the study of atmospheric constituents and aerosols. The instrument and its performance are described. Due to telescope structure and lock-in amplification technique adopted,the sensitivity of the instrument is high enough to conduct direct sun moon and twilight measurement for several atmospheric species and the degree of polarization and intensity observation for sky light. From measured results, the total column abundance of atmospheric species and the optical characteristics of aerosol can be retrieved. In this paper, the daily averaged column abundance of O_3 measured in Beijing by direct sun was compared with Dobson spectrophotometer nearby. The two did not show significant difference.展开更多
In this paper, with the technology of vacuum sputter, pure aluminum corrosion sensitive film was directly deposited on the core of optical fiber with its clad removed.Metallographic microscope and scanning electron mi...In this paper, with the technology of vacuum sputter, pure aluminum corrosion sensitive film was directly deposited on the core of optical fiber with its clad removed.Metallographic microscope and scanning electron microscope (SEM) were used to analyze the structure of the film.The thickness of the pure aluminum corrosion sensitive film was about 14.65 μm, and the film was distributed evenly and firmly bonded with the fiber core.Galvanostatic step and electrochemical impedance spectroscopy (EIS) were used to evaluate the corrosion resistance in NaCl solution with different concentrations (0.001—0.1 mol·L -1).The result showed that the corrosion resistance of the aluminum film was similar to that of industrial pure aluminum in NaCl solution with the concentration less than 0.1 mol·L -1.But the EIS data showed that there were holes on the film surface.展开更多
文摘Figure 6(a)in the paper[Chin.Phys.B 33074203(2024)]was incorrect due to editorial oversight.The correct figure is provided.This modification does not affect the result presented in the paper.
基金Project supported by the National Natural Science Foundation of China(Grant No.NSFC 12175107)the Natural Science Foundation of Nanjing Vocational University of Industry Technology,China(Grant No.YK22-02-08)+3 种基金the Qing Lan Project of Jiangsu Province,Chinathe Postgraduate Research&Practice Innovation Program of Jiangsu Province,China(Grant No.KYCX23_0964)the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20230347)the Fund from the Research Center of Industrial Perception and Intelligent Manufacturing Equipment Engineering of Jiangsu Province,China(Grant No.ZK21-05-09)。
文摘Photonic spin Hall effect(PSHE), as a novel physical effect in light–matter interaction, provides an effective metrological method for characterizing the tiny variation in refractive index(RI). In this work, we propose a multi-functional PSHE sensor based on VO_(2), a material that can reveal the phase transition behavior. By applying thermal control, the mutual transformation into different phase states of VO_(2) can be realized, which contributes to the flexible switching between multiple RI sensing tasks. When VO_(2) is insulating, the ultrasensitive detection of glucose concentrations in human blood is achieved. When VO_(2) is in a mixed phase, the structure can be designed to distinguish between the normal cells and cancer cells through no-label and real-time monitoring. When VO_(2) is metallic, the proposed PSHE sensor can act as an RI indicator for gas analytes. Compared with other multi-functional sensing devices with the complex structures, our design consists of only one analyte and two VO_(2) layers, which is very simple and elegant. Therefore, the proposed VO_(2)-based PSHE sensor has outstanding advantages such as small size, high sensitivity, no-label, and real-time detection, providing a new approach for investigating tunable multi-functional sensors.
文摘A kind of fluorescent sensing coating was prepared for monitoring corrosion of aluminum alloys by incorporating phenylfluorone(PF) into acrylic paint as sensing material. The fluorescent dye PF reacts with aluminum ions on corroded aluminum substrate to occur fluorescence quenching observed in UV light. This paint system is sensitive to underlying corrosion processes through reacting with the Al3+ produced by anodic reaction accompanying corrosion. After a certain time, when the samples of Al alloy 2024 coated with PF-acrylic paint were immersed in 1 mol/L NaCl solution, fluorescence quenching spots can be seen with unaided eyes. With the development of corrosion process, the size of fluorescence quenching spots increases. Active corrosion areas on the sample surface were found under the fluorescence quenching spots by optical microscope. The corrosion areas can be observed more clearly by SEM, and many pits are found. This suggests that the fluorescence quenching spots are the sites of produced Al3+ by the anodic reaction of the local attack of the coated Al alloy substrate in the chloride solution and the corrosion process of the coated Al alloy can be monitored on-line by the sensing coating. The sensitivity of this coating system for detection of anodic reaction associated with corrosion was determined by applying constant charge current and measuring the charge, at which fluorescence quenching is detected in the coating with unaided eyes. Visual observation of coated samples can detect fluorescence change resulting from a charge corresponding to an equivalent hemispherical pit with approximate depth of 50 μm.
基金National Natural Science Foundation of China(62175090)Basic and Applied Basic Research Foundation of Guangdong Province(2024A1515011846)Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2019BT02X105)。
文摘Semiconductor metal oxides with narrow bandgap have emerged as a promising platform for photoelectrochemical reactions,yet their photoelectron-induced photocorrosion effect has been a limitation for their wider applications.Understanding the conversion processes concomitant with photoelectrochemical reaction at the electrode-electrolyte interface plays a crucial role in revealing the corrosion mechanisms and advancing the development of efficient photocathodes.However,accurately and in situ tracking these dynamic chemical events remains a great challenge due to the fact that reaction processes occur at nanoscale interfaces.Here,we track the electrochemical growth and conversion of copper nanostructures at interface by the evanescent field of the surface plasmon wave by using a gold-coated optical fiber as an electrochemical electrode and light sensing probe.The results exhibit correlation between redox processes of copper species and plasmonic resonances.Furthermore,in situ fiber-optic detection reveals the photocorrosion dynamics under photoelectrochemical reaction,including photoelectron-induced self-reduction of copper oxide and self-oxidation of cuprous oxide.These demonstrations facilitate not only the diagnosis for the health condition of photocathode nanomaterial,but also the understanding of the underlying reaction mechanism,and thus are potentially crucial for advancing the development of highly efficient photocathodes in future energy applications.
文摘A multi-functional solar and skylight spectrophotometer has been developed for the study of atmospheric constituents and aerosols. The instrument and its performance are described. Due to telescope structure and lock-in amplification technique adopted,the sensitivity of the instrument is high enough to conduct direct sun moon and twilight measurement for several atmospheric species and the degree of polarization and intensity observation for sky light. From measured results, the total column abundance of atmospheric species and the optical characteristics of aerosol can be retrieved. In this paper, the daily averaged column abundance of O_3 measured in Beijing by direct sun was compared with Dobson spectrophotometer nearby. The two did not show significant difference.
文摘In this paper, with the technology of vacuum sputter, pure aluminum corrosion sensitive film was directly deposited on the core of optical fiber with its clad removed.Metallographic microscope and scanning electron microscope (SEM) were used to analyze the structure of the film.The thickness of the pure aluminum corrosion sensitive film was about 14.65 μm, and the film was distributed evenly and firmly bonded with the fiber core.Galvanostatic step and electrochemical impedance spectroscopy (EIS) were used to evaluate the corrosion resistance in NaCl solution with different concentrations (0.001—0.1 mol·L -1).The result showed that the corrosion resistance of the aluminum film was similar to that of industrial pure aluminum in NaCl solution with the concentration less than 0.1 mol·L -1.But the EIS data showed that there were holes on the film surface.
