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Designed of bifunctional Z-scheme CuSnO3@Cu2O heterojunctions film for photoelectrochemical catalytic reduction and ultrasensitive sensing nitrobenzene
摘要： A direct Z-scheme CuSnO3@Cu2O heterojunctions photo-electroactive material were reasonably designed and fabricated by electrodeposited Cu2O on fluoride doped tin oxide (FTO) substrate followed anchoring 3D CuSnO3 microspheres onto Cu2O film. The novel 3D architectures can favor the mass transfer, provide multiple active sites and improve light absorption during the photoelectrocatalytic reactions. The artificial heterogeneous Z-scheme photoelectrochemical (PEC) system further prolong electrons path, promote the separation of photogenerated charge carriers and maintain high redox ability. As expected, the constructed Z-scheme CuSnO3@Cu2O as the photocathode show excellent dual functional properties which can not only detect the trace nitrobenzene (NB) but also undergo catalytic reduction of NB to less toxic species (aniline, AN) under visible light irradiation. Based on CuSnO3@Cu2O photocathode, the photocurrent was linearly proportional to the concentration of NB ranging from 0.5 nmol L-1 to 100 μmol L-1, and the detection limit (S/N = 3) was 0.43 nmol L-1. The fabricated sensor was successfully used to sensing the trace NB in real samples and it showed excellent anti-interference ability, good reproducibility and high stability. Besides, CuSnO3@Cu2O exhibited high PEC activity for NB reduction, 85.70% reduction efficiency was achieved within irradiation for 2.5 h. Thus, this study may provide insights into designing advanced photoeletrocatalysts for energy conversion and render a tunable platform in photoelectrochemistry for the monitor and clean-ups of environmental pollutants.
关键词： Photoelectrochemical sensor,Z-scheme,Nitrobenzene,Photoelectroreduction,CuSnO3@Cu2O heterojunctions
更新于2025-09-04 15:30:14
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Multifunctional piezoelectric elastomer composites for smart biomedical or wearable electronics
摘要： The development of nanogenerators that is capable of converting mechanical energy into electricity could enable extraordinary advances in biomedical devices and wearable consumer electronics. Piezoelectric composites have no intricate assemblies, providing a compact and reliable alternative to energy interconversion in biomedical electronics. This work deals with the development of a new class of piezoelectric elastomer composite which is integrated multiple potential functionalities. To fully understand and exploit the unique properties of the composited material, characterisations in terms of general mechanical, dynamic mechanical, and dynamic piezoelectric experimental investigations have been conducted. Three prototypes with individual application have been successfully built up utilising the piezoelectric elastomer composite. The versatility of the composite developed in this work presents its outstanding potential in building self-powered systems or biomedical implanted sensors.
关键词： Biomedical sensor,Piezoelectricity,Elastomer composite,Smart artery replacement
更新于2025-09-04 15:30:14
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Organic nanostructure sensing layer developed by AAO template for the application in humidity sensors
摘要： The present study demonstrates a novel nanoporous structure of aluminium 1,8,15,22-tetrakis 29H,31H phthalocyanine chloride (AlPcCl) prepared by template-assisted method for a humidity sensor. The nanoporous sensing layer was fabricated by solution wetting of anodic aluminium oxide template. The solutions of AlPcCl in different concentrations were spun cast over the template at various speeds. Both capacitive and resistive responses were measured as a function of different relative humidity levels. The sensor showed wide operating relative humidity range and responded at quite low humidity levels. Morphological changes were investigated by field emission scanning electron microscopy. The sensor showed wide operating relative humidity range. The sensor demonstrated better performance with improved sensing parameters, highlighting unique advantages of the low-molecular nanostructured sensing layer for the humidity sensors.
关键词： humidity sensor,AlPcCl,anodic aluminium oxide,nanoporous structure,template-assisted method
更新于2025-09-04 15:30:14
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Confinement of Singlet Oxygen Generated from Ruthenium Complex-Based Oxygen Sensor in the Pores of Mesoporous Silica Nanoparticles
摘要： We synthesized mesoporous silica nanoparticles bearing ruthenium complexes in their pores (MSN-Ru) and characterized their photochemical properties. The ruthenium complexes that were immobilized in the pores showed oxygen-dependent phosphorescence, similar to the complexes that were not tethered to nanoparticles. Cellular imaging and in vivo experiments revealed that hypoxic cells and tissues could be visualized by monitoring the phosphorescence of MSN-Ru. Our most important finding was that the toxic effect of singlet oxygen (1O2), which was generated by excitation of the complexes, was effectively suppressed by the deactivation before leaking out from the pores. In addition, we observed a negligible toxic effect of the ruthenium complexes themselves due to the blockage of their direct interaction with intracellular biomolecules. Thus, MSN-Ru is a promising molecular probe of oxygen levels in living cells and tissues.
关键词： ruthenium complexes,singlet oxygen,in vivo experiments,cellular imaging,oxygen sensor,mesoporous silica nanoparticles
更新于2025-09-04 15:30:14
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Superwide-Range Fiber Bragg Grating Displacement Sensor Based on an Eccentric Gear: Principles and Experiments
摘要： Aiming at the large displacement monitoring needs of slope, road, and bridge engineering, a new method concerning the superwide-range fiber Bragg grating (FBG) displacement sensor based on eccentric gear was investigated. The structure of the sensor was designed and the formula for the wavelength-displacement relationship was established via waveform fitting from calibration tests. The lateral displacement of a first-story shear wall was successfully monitored in a hysteresis test of a steel frame–reinforced concrete infill wall. A FBG relative displacement sensor was developed refitting a superwide-range fiber Bragg grating displacement sensor based on eccentric gear. The refitted sensor was applied in a self-repairing performance test of a shape memory alloy (SMA) strengthened concrete beam. The monitoring results of the crack were compared with the results of an integrated test instrument, and the results showed that the sensor exhibited very good accuracy. The innovative FBG displacement sensor has a low influence on the structure, strong practicability, and good prospects for engineering applications.
关键词： Crack measurement,Fiber Bragg grating (FBG),Superwide-range displacement monitoring,Eccentric gear,Displacement sensor
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Finger Ring Phased Antenna Array for 5G IoT and Sensor Networks at 28 GHz
摘要： In this paper, a circular phased antenna array has been constructed on the finger ring for the 28 GHz 5G communication systems. The antenna array has been verified in free space and with user’s hand phantom on three fingers by the simulations. It has been found that such antenna structure is resilient towards the user effects and has a stable coverage efficiency characteristics. The coverage efficiency of 80 % with the realized gain of 5 dBi has been observed when the ring simulated with the user’s hand. The correlation between high power loss density with antenna de-tuning has also been observed.
关键词： 5G,Wearable Antennas,Sensor Networks,28 GHz,Phased Array,IoT,Finger Ring Antenna,User effects,Antennas
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 18th International Conference on Bioinformatics and Bioengineering (BIBE) - Taichung, Taiwan (2018.10.29-2018.10.31)] 2018 IEEE 18th International Conference on Bioinformatics and Bioengineering (BIBE) - Sigma-Delta ADC for Image Sensor in Virtual and Augmented Reality Camera to Medical Training
摘要： This article presents a continuous time lowpass sigma-delta ADC for wide field of view (FOV) image sensor with a chain of integrators and with capacitive feedforward summation (CICFF) plus circuit which for implementation in low power applications. The summation of feedforward signals is achieved by capacitors plus, without the essential thing of any extra active components which can be used in virtual reality (VR) and augmented reality (AR) camera. The quantizer uses a comparator which can achieve high linearity easily. The chip was implemented in 1.8 V supply voltage which works as a part of CMOS active-pixel image sensor with global shutter and high dynamic range (HDR) operation. The proposed idea can support medical training.
关键词： Sigma-Delta ADC,Medical Training,Image Sensor,Augmented Reality
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - High Sensitivity Inkjet-Printed Terahertz Metallic Hole Array Sensor
摘要： Surface plasmon resonance sensors based on the resonant transmission characteristics of metal hole arrays are fabricated using conductive inkjet printing for operation in the terahertz region. The response of the sensing surfaces is measured using terahertz time domain spectroscopy. The addition of a layer of glycerol on the surface that is much thinner than the wavelength of the incident wave is simulated and results in a significant shift of the resonance frequency. This indicates the possibility of realising a flexible low-cost sensor for chemical and biological substances.
关键词： metamaterial,surface plasmon polariton,inkjet,sensor,Conductive ink printing
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Penetration Depth Evaluation of Split Ring Resonator sensor using In-Vivo Microwave Reflectivity and Ultrasound Measurements
摘要： This article focuses on the application of split ring resonator based sensor for follow up recovery of lower extremity trauma patients. The proposed sensor mainly monitors the changes of dielectric properties of lower limb tissues such as skin, fat, muscle and bone. As part of the characterization of microwave sensor, it is crucial to assess the signal penetration in in-vivo tissues. This work presents a new approach for investigating the penetration depth of Split Ring Resonator sensor in in-vivo context of the femoral area. The method is based on the measurement of skin, fat, and muscle tissue thicknesses from ultrasound images. The microwave reflectivity, S11 measurements are done in conjunction with ultrasound measurements on four volunteers to deduce the effective permittivity of the in-vivo tissues. The tissue thickness information derived from ultrasound measurements were used to create 3D simulation model in CST studio 2017. The measured S11 values are used to optimize the effective permittivity of that model. The penetration depths are calculated from the simulation of electric field distribution in the optimized model. The analysis on measured data shows that the thigh region contributes highest penetration depth up to 17.5mm. This result has higher significance in demonstrating the in-vitro penetration depth measurements and other tests which are going to be performed in the future.
关键词： Microwave,Ultrasound,Sensor,Penetration depth,Split Ring Resonator
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Automotive Radar and Radome Calibration to Improve the Direction of Arrival Detection Performance
摘要： An assessment of the improvement in the Direction of Arrival (DoA) measurements in automotive radar sensor by joint calibration of the radar sensor plus the radome is presented. Nowadays, radar sensors are calibrated before the radome-emblem assembly. This makes radar sensors more vulnerable to the errors induced by the radome-emblems. This new approach is based on the idea of calibrating the radar sensor with the radome to improve the determination of the Direction of Arrival (DoA) and consequently reduce the angle error.
关键词： Calibration,Radar Sensor,Angle Error,Radome,Direction of Arrival,DoA
更新于2025-09-04 15:30:14