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Luminescent sensing film based on sulfosalicylic acid modified Tb(III)-doped yttrium hydroxide nanosheets
摘要： Sulfosalicylic acid (SSA) was used as an intercalation agent and an excellent antenna to synthesize layered rare-earth hydroxide (LRH) materials and directly obtain SSA-modified terbium-doped ytterbium hydroxide nanosheets by mechanical exfoliation. The crystal structure and morphologies of the LRHs and nanosheets were determined by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The particle size and zeta potential of the prepared nanosheets were also analyzed. The as-prepared nanosheets exhibited excellent luminescent properties. The positively charged nanosheets were electrophoretically deposited on a conductive glass to form a thin film. The luminescence of this thin film can be quenched by chromate (CrO4^2-) and bilirubin (BR), which shows good sensing properties. The quenching mechanism of the sensing film by CrO4^2- and BR was discussed based on the spectra and structure of the film.
关键词： chromate (CrO4^2-),thin-film sensor,nanosheets,bilirubin (BR),rare-earth hydroxide
更新于2025-09-23 15:22:29
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AACVD Grown WO3 Nanoneedles Decorated with Ag/Ag2O Nanoparticles for Oxygen Measurement in a Humid Environment
摘要： A sensitive material consisting of silver/silver oxide decorated WO3 was successfully grown in two steps via aerosol-assisted chemical vapour deposition (AACVD). Morphological, structural, and composition analysis revealed our method is effective for growing WO3 nanoneedles decorated with silver/silver oxide nanoparticles at relatively low temperature (≤ 375°C) onto sensor arrays printed on alumina substrate. The sensors were tested for oxygen under humid environment (relative humidity ~85%) with the concentration ranging between 0% and 20%. Gas sensing results showed good response to oxygen with optimum temperature was observed at 400°C for undecorated WO3 and at 350°C for silver/silver oxide decorated WO3. The addition of silver/silver oxide was found to improve the sensor response by almost 300%, making the sensor a potential alternative to replace existing Pb-based oxygen sensor.
关键词： Chemical sensor,heterojunction,tungsten oxide,oxygen detection,silver oxide,thin film sensor
更新于2025-09-09 09:28:46
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Pressure and Temperature Dependence of Field-Induced Oscillation in Two-Terminal Device Based on Vanadium Dioxide Thin Film
摘要： In this paper, we investigated the pressure and temperature dependence of the frequency and amplitude of the ?eld-induced oscillation created in a two-terminal device based on a vanadium dioxide (cid:2) thin ?lm. First, a simple oscillation circuit was constructed using a VO2-based two-terminal (VO2 device, a standard resistor, and a DC power supply. Then, the frequency and amplitude variation of the ?eld-induced oscillation was observed for pressure changes applied to the VO2 device in a pressure chamber. This variation of the oscillation characteristics was also examined for ambient temperature changes applied to the VO2 device using a plate heater. When the chamber pressure increased from 0 to 5 MPa with a step of 1 MPa at 25 (cid:3)C, the oscillation frequency increased from ～592 to ～739 kHz, and the oscillation amplitude decreased from ～12.60 to ～11.40 V. Similarly, when the heater temperature increased from 25 to 50 (cid:3)C (step: 5 (cid:3)C) without applied pressure, the oscillation frequency increased from ～592 to ～819 kHz, and the oscillation amplitude decreased from ～12.60 to ～7.16 V. Owing to linear pressure and temperature responses of the VO2 oscillation, the pressure and temperature sensitivities of the oscillation frequency and amplitude could be obtained as four different constant coef?cients from the measurement results. These coef?cients can be directly utilized for simultaneously measuring pressure and temperature variation applied to the VO2 device, which can be bene?cially applied to localized temperature and pressure sensing at a very small area less than 1 mm2.
关键词： Vanadium Dioxide,Thin Film,Sensor,Field-Induced Oscillation
更新于2025-09-09 09:28:46