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Design and Performance Evaluation of a Deep Ultraviolet LED-Based Ozone Sensor for Semiconductor Industry Applications.
Micromachines (Basel)
March 2024
School of Information Science and Engineering (ISE), Shandong University, Qingdao 266237, China.
Ozone (O) is a critical gas in various industrial applications, particularly in semiconductor manufacturing, where it is used for wafer cleaning and oxidation processes. Accurate and reliable detection of ozone concentration is essential for process control, ensuring product quality, and safeguarding workplace safety. By studying the UV absorption characteristics of O and combining the specific operational needs of semiconductor process gas analysis, a pressure-insensitive ozone gas sensor has been developed.
View Article and Find Full Text PDFCompact contactless conductometric, ultraviolet photometric and dual-detection cells for capillary electrophoresis via additive manufacturing.
J Chromatogr A
December 2023
School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China. Electronic address:
The growing demand for tailored detectors in capillary electrophoresis (CE), addressing tasks like field deployment or dual-detection analysis, emphasizes the necessity for compact detection cells. In this work, we propose cost-effective and user-friendly additive manufacturing (3D-printing) approaches to produce such miniaturized detection cells suitable for a range of CE applications. Firstly, capacitively-coupled contactless conductivity detection (CD) cells of different sizes are fabricated by casting low-melting-point alloy into 3D-printed molds.
View Article and Find Full Text PDFDeep UV-LED induced nitrate-to-nitrite conversion for total dissolved nitrogen determination in water samples through persulfate digestion and capillary electrophoresis.
Anal Chim Acta
October 2023
School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin, Guangxi, 541004, China. Electronic address:
Background: Capillary electrophoresis (CE) with capacitively coupled contactless conductivity detection (CD) is widely used for water quality monitoring. However, there is currently no reported CE method for detecting total dissolved nitrogen (TDN), a crucial parameter for assessing water eutrophication. One challenge is the high sulfate concentration (100 mM) introduced during persulfate digestion, leading to overlap of nitrate (from TDN) and poor electrical stacking of nitrate in CE-CD analysis.
View Article and Find Full Text PDFIn this paper, we significantly improved the internal quantum efficiency and output power of AlGaN-based deep UV (DUV) LEDs by replacing the conventional p-AlGaN electron blocking layer (EBL) with the p-AlInGaN/AlInGaN graded superlattice (SL) EBL. Simulation results show that the introduction of the p-AlInGaN graded SL EBL improved the carrier distribution while having the lower electric field, thus increasing the radiative recombination rate in multiple quantum wells (MQWs). The highest IQE obtained by p-AlInGaN/AlInGaN graded SL EBL is 96.
View Article and Find Full Text PDFLong-Wavelength Near-Infrared Divalent Nickel-Activated Double-Perovskite BaMgWO Phosphor as Imaging for Human Fingers.
ACS Appl Mater Interfaces
August 2023
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Transmission near-infrared (NIR) imaging technology has great potential for biomedical imaging because of its lower water absorption coefficient and highly reduced photon scattering effect in biological tissues compared to visible light. The extent of biological tissue photon scattering is inversely proportional to wavelength; therefore, in principle, imaging with long-wavelength NIR helps improve the resolution of the optical image, but deep tissue high-resolution luminescence imaging is still very challenging technically. Here, we report the discovery of a BaMgWO:Ni double perovskite phosphor that emits broadband long-wavelength NIR (1200-2000 nm) under 365 nm near-ultraviolet (UV) excitation, with a full width at half-maximum of 255 nm.
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