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Dong Xiaohu,Jiang Xuecheng,Gu Yan,Wei Chunlei,Xie Zhijian,Zhang Qi,Qian Weiying,Zhang Xiangyang,Zhu Chun,Lu Naiyan,Chen Guoqing,Yang Guofeng 한국물리학회 2023 Current Applied Physics Vol.50 No.-
This work presents a new approach for lead ion detection (Pb2+) using an aluminum gallium nitride/gallium nitride (AlGaN/GaN) high-electron-mobility transistor (HEMT) sensor. The AlGaN/GaN HEMT structure of the sensor was realized by functionalizing the gate area with glutathione (GSH). The crystalline and surface qualities of the AlGaN film were measured through X-ray diffraction and atomic force microscopy. The response of the sensor was measured in terms of the source–drain current with varying concentrations of Pb2+ ions at a fixed drain-to-source voltage. The sensitivity of the sensor was 29.3 μA/(mg/L), and it exhibited high selectivity toward Pb2+. The results show that using the GSH-functionalized AlGaN/GaN HEMT sensor is a promising strategy for Pb2+ ion detection.
Quinoline-Based Two-Photon Fluorescent Probe for Nitric Oxide in Live Cells and Tissues
Dong, Xiaohu,Heo, Cheol Ho,Chen, Shiyu,Kim, Hwan Myung,Liu, Zhihong American Chemical Society 2014 ANALYTICAL CHEMISTRY - Vol.86 No.1
<P>A two-photon fluorescent probe (QNO) for nitric oxide is reported. The probe is designed with a photoinduced electron transfer (PeT) mechanism and shows 12-fold fluorescence enhancement toward NO. Adopting a quinoline derivative as the fluorophore, QNO has a large two-photon action cross section value of 52 GM and long-wavelength emission. It also features high selectivity, low cytotoxicity, and pH insensitivity. By utilizing two-photon microscopy (TPM), QNO can detect NO in live cells and live tissues at a depth of 90-180 mu m.</P>
Dual-Color Imaging of Magnesium/Calcium Ion Activities with Two-Photon Fluorescent Probes
Dong, Xiaohu,Han, Ji Hee,Heo, Cheol Ho,Kim, Hwan Myung,Liu, Zhihong,Cho, Bong Rae American Chemical Society 2012 ANALYTICAL CHEMISTRY - Vol.84 No.19
<P>We report two-photon probes (FMg1 and FMg2) that can selectively detect intracellular free Mg<SUP>2+</SUP> ([Mg<SUP>2+</SUP>]<SUB>i</SUB>) in live cells and tissues by two-photon microscopy. Combined with BCaM, a two-photon probe for near-membrane Ca<SUP>2+</SUP> ([Ca<SUP>2+</SUP>]<SUB>m</SUB>), FMg2 allows dual-color imaging of Mg<SUP>2+</SUP>/Ca<SUP>2+</SUP> activities in live cells and [Mg<SUP>2+</SUP>]<SUB>i</SUB> /[Ca<SUP>2+</SUP>]<SUB>m</SUB> distributions in live tissues at a depth of 100–200 μm.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2012/ancham.2012.84.issue-19/ac302210v/production/images/medium/ac-2012-02210v_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac302210v'>ACS Electronic Supporting Info</A></P>
Xiaohu Wu,Jun Xu,Xingang Liu,Feng Shou Dong,Yanbing Wu,Ying Zhang,Yongquan Zheng 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.3
A simple, quick and reliable analytical method for the confirmation and quantification of propisochlor was developed. The propisochlor was extracted from water, soil and rice (stalks, rice and hull) matrices using acetonitrile, and cleaned up with primary secondary amine and determined by UPLC-MS/MS. The LODs of propisochlor ranged from 0.03 μg/kg to 0.12 μg/kg, while the LOQs ranged from 0.1 μg/kg to 0.4 μg/kg in different matrixes. The mean recoveries of propisochlor at three levels (0.005, 0.01 and 0.05 mg/kg) were in the range of 73.7-94.9% with intra-day relative standard deviations (RSD) of 1.1-13.9% and inter-day RSDR of 3.3-12.7%. This method is suitable for routine analysis of propisochlor under field conditions. The half-lives of propisochlor in rice stalks, water and soil were 1.7, 1.5 and 2.3 days in Hunan, 5.7, 1.0 and 1.9 days in Anhui and 4.8, 1.0 and 3.1 days in Guangxi.
Research on Fixture Hole Drilling Quality of Printed Circuit Board
Xiaohu Zheng,Dapeng Dong,Lixin Huang,Qinglong An,Xibin Wang,Ming Chen 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
Printed circuit board (PCB) fixture hole is used for installing PCB board or fixing PCB board during drilling process. The drilling quality parameters involve burr size, hole wall roughness et al. In order to improve drilling quality, proper drilling parameters and tool geometries are important especially the tool geometries. In this study, the drilling machinability of PCB fixture hole is studied,effects of drilling parameters on thrust force, drilling temperature and quality are discussed. The experimental results show that resin will be melted during the drilling process. The increase in spindle speed will lead to drilling temperature rise. The fuzzing and spalling of glass fibers result in the generation of hole wall roughness. The exit burrs and enter burrs are generated from drilling copper foils which located in the upper and lower surfaces. The heights of exit burrs are increased with the elevated feed. Drilling experiments are carried out with 9 drill bits which have different point angles, helix angles and length of chisel edges. Analysis of variance (ANOVA) is carried out for hole quality parameters. Desirability function method is used in multiple response optimization to obtain the optimal tool geometry parameters.
Wu, Xiaohu,Xu, Jun,Liu, Xingang,Dong, Fengshou,Wu, Yanbing,Zhang, Ying,Zheng, Yongquan Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.3
A simple, quick and reliable analytical method for the confirmation and quantification of propisochlor was developed. The propisochlor was extracted from water, soil and rice (stalks, rice and hull) matrices using acetonitrile, and cleaned up with primary secondary amine and determined by UPLC-MS/MS. The LODs of propisochlor ranged from 0.03 ${\mu}g/kg$ to 0.12 ${\mu}g/kg$, while the LOQs ranged from 0.1 ${\mu}g/kg$ to 0.4 ${\mu}g/kg$ in different matrixes. The mean recoveries of propisochlor at three levels (0.005, 0.01 and 0.05 mg/kg) were in the range of 73.7-94.9% with intra-day relative standard deviations (RSD) of 1.1-13.9% and inter-day $RSD_R$ of 3.3-12.7%. This method is suitable for routine analysis of propisochlor under field conditions. The half-lives of propisochlor in rice stalks, water and soil were 1.7, 1.5 and 2.3 days in Hunan, 5.7, 1.0 and 1.9 days in Anhui and 4.8, 1.0 and 3.1 days in Guangxi.
Rui Gao,Chen Jiang,XiaoHu Lang,KangJia Dong,FuRong Li 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.3
High-power semiconductor laser cavities are formed via the cleavage plane, and critically influence the reliability and performance of the laser. This paper investigates both the scratching operation and the cleavage operation to improve the quality of the cleavage plane during the entire cleavage process. The scratching capability index (SCI) variable was proposed to evaluate the scratch quality of GaAs. A series of scratching and cleavage experiments were carried out to investigate the effect of the scratch features on the GaAs cleavage plane. Experimental results of the scratching operation showed that a smaller scratching load and higher scratching speed were beneficial for reducing the kerf width and damage area width of GaAs. The cleavage operation on GaAs {100} cleavage planes exhibited crack propagation in the [1̄01̄] and [1̄00] directions and a slip direction in the <110> crystal direction. The calculated SCI variable correlated well with the scratch and cleavage qualities of GaAs, where a higher scratching SCI correlated with a smoother GaAs cleavage plane during cleavage processing. Thus, the SCI has the potential to relate the scratching parameters with the resulting cleavage plane quality of GaAs, which will help improve the manufacturing of semiconductor laser chips in the future.