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Determination of toluene diisocyanate in synthetic-rubber track by ion chromatography with ultraviolet detection after alkaline suppressor

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Chinese Chemical Letters 2009年第2期20卷 207-209页

作者： Mei Lan Chen Yun Chang Fan Chang An Li Dong Fei Yan Zhu Biology and Environment College of Zhejiang Shuren University Hangzhou 310015 China Department of Chemistry Xixi Campus Zhejiang University Hangzhou 310028 China School of Economics and Management Zhejiang University of Science and Technology Hangzhou 310023 China Department of Material and Chemical Engineering Guilin University of Technology Guilin 541004 China

In the present work, a novel analytical method was proposed for the determination of toluene diisocyanate （TDI） in syntheticrubber track by ion chromatography （IC） coupled with an ultraviolet detector setting at 212 nm. TDI can be hydrolyzed to toluene diamine （TDA） which can be separated by cation-exchange IC easily. The optimum IC separation was performed on an IonPac CS12A column （150 mm ×4.0 mm） using 20 mmol L^-1 sodium sulfate, 10 mmol L^-1 sulfuric acid and 10% acetonitrile as eluent. It was found that a higher signal response of TDA could be obtained under alkaline condition. A suppressor was used to change the acidic eluent into alkaline one. 0.8 mol L^-1 potassium hydroxide was chosen as the optimum regeneration eluent. With the added suppressor and regenerant, signal response was magnified by about 16 times and lower limit of detection （LOD, 0.13 μg L^-1） was obtained. Within-day relative standard deviation （R.S.D.） was less than 3.6%. The recoveries of TDI spiked in synthetic-rubber track samoles were 96.4-110.6%.

关键词： Ion chromatography (IC) ultraviolet detection Toluene diisocyanate (TDI)

Dual-functional hydrogen-bonded organic frameworks for aniline and ultraviolet sensitive detection

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Chinese Chemical Letters 2021年第10期32卷 3109-3112页

作者： Zhijun Ke Kexin Chen Zhenzhen Li Jie Huang Zizhu Yao Wen Dai Xiaofan Wang Chulong Liu Shengchang Xiang Zhangjing Zhang Fujian Provincial Key Laboratory of Polymer Materials College of Chemistry and Materials ScienceFujian Normal UniversityFuzhou 350007China

A novel hydrogen-bonded organic frameworks(HOFs)FJU-200 has been constructed from N,N’-bis(5-isophthalic acid)naphthalimide(H_(4)L).FJU-200 has a good dual-function of aniline and ultraviolet ***-200 is the first case of HOF with dual sensing of visual color changes and photoluminescence quenching for aniline detection,and the detection limit of aniline can reach5.5 x 10^(-4)mol/*** ultraviolet FJU-200 will rapidly change from light yellow to rustic brown,which makes it possible to use FJU-200 to achieve minute-level ultraviolet ***,for more convenient use,FJU-200 test papers are *** them,convenient and fast aniline or ultraviolet detection can be *** single-crystal X-ray structures show that compared with the original FJU-200,both PhNH_(2)@FJU-200 and UV-FJU-200 have larger pore sizes,and the dihedral angles of the H_(2)L^(2-)in framework has been changed.

关键词： Hydrogen-bonded organic frameworks(HOFs) Dual-function Aniline detection ultraviolet detection Sensitive

Rapid and simultaneous determination of imidazolium and pyridinium ionic liquid cations by ion-pair chromatography using a monolithic column

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Chinese Chemical Letters 2012年第7期23卷 843-846页

作者： Xu Huang Hong Yu Ying Jie Dong College of Chemistry and Chemical Engineering Harbin Normal UniversityHarbin 150025China

A method for rapid and simultaneous determination of imidazolium and pyridinium ionic liquid cations by ion-pair chromatography with ultraviolet detection was developed. Chromatographic separations were performed on a reversed-phase silica-based monolithic column using 1-heptanesulfonic acid sodium-acetonitrile as mobile phase. The effects of ion-pair reagent and acetonitrile concentration on retention of the cations were investigated. The retention times of the cations accord with carbon number rule. The method has been successfully applied to the determination of four ionic liquids synthesized by organic chemistry laboratory.

关键词： Ionic liquids Ion-pair chromatography Monolithic column ultraviolet detection

Organometallic perovskite single crystals grown on lattice-matched substrate for photodetection

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Nano Materials Science 2020年第3期2卷 292-296页

作者： Xin Wang Yuwei Li Yubing Xu Yuzhu Pan Yao Wua Guanwen Li Wei Zhang Shuyi Ding Jing Chen Wei Lei Dewei Zhao Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and EngineeringSoutheast UniversityNanjing210096China Shenzhen China Star Optoelectronics Semiconductor Display Technology Co.Ltd. ShenZhen518132China School of Information Engineering Nanjing Normal University Taizhou CollegeTaizhouChina Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization The University of ToledoToledoOH43606United States

In this work,we demonstrate that an organometallic perovskite(OP)single crystal for effective photodetection can be grown on a gold(Au)-decorated substrate using liquid phase *** covered gold could both control the shape of the epitaxial layer and act as its *** MAPbCl3 single crystal and an MAPbBr1.5Cl1.5 single crystal were used as the substrate and the epitaxial layer,*** device,with an Au-perovskite-Au structure,can be fully *** to the high-quality epitaxial layer,the maximum external quantum efficiency(EQE)value is over 60%under the voltage of20 *** addition,the response speed can reach 200 and 500 ns(ns)rise and fall,*** work provides an effective and promising method to fabricate efficient perovskite-based photodetectors.

关键词： Perovskite single crystals Liquid phase epitaxy ultraviolet detection

Recent progress of SiC UV single photon counting avalanche photodiodes

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Journal of Semiconductors 2019年第12期40卷 59-69页

作者： Linlin Su Dong Zhou Hai Lu Rong Zhang Youdou Zheng School of Electronic Science and Engineering Nanjing University

4H-SiC single photon counting avalanche photodiodes(SPADs)are prior devices for weak ultraviolet(UV)signal detection with the advantages of small size,low leakage current,high avalanche multiplication gain,and high quantum efficiency,which benefit from the large bandgap energy,high carrier drift velocity and excellent physical stability of 4 H-SiC semiconductor *** detectors are widely used in many key applications,such as missile plume detection,corona discharge,UV astronomy,and biological and chemical agent *** this paper,we will describe basic concepts and review recent results on device design,process development,and basic characterizations of 4 H-SiC avalanche *** promising device structures and uniformity of avalanche multiplication are discussed,which are important for achieving high performance of 4 HSiC UV SPADs.

关键词： SiC avalanche photodiodes single photon counting ultraviolet detection

Structural designs of AlGaN/GaN nanowire-based photoelectrochemical photodetectors:carrier transport regulation in GaN segment as current flow hub

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Advanced Photonics Nexus 2023年第3期2卷 16-26页

作者： Saisai Wang Pengfei Shao Ting Zhi Zhujun Gao Wenhao Chen Lin Hao Qing Cai Jin Wang Junjun Xue Bin Liu Dunjun Chen Lianhui Wang Rong Zhang Nanjing University of Posts and Telecommunications College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology)NanjingChina Nanjing University School of Electronic Science and EngineeringNanjingChina

The AlGaN/GaN p-n junction has received extensive attention due to its capability of rapid photogenerated carrier separation in photodetection *** AlGaN/GaN heterojunction nanowires(NWs)have been especially endowed with new life for distinctive transport characteristics in the photoelectrochemical(PEC)detection field.A self-powered PEC ultraviolet photodetector(PEC UV PD)based on the p-AlGaN/n-GaN heterojunction NW is reported in this *** n-GaN NW layer plays a crucial role as a current flow hub to regulate carrier transport,which mainly acts as a light absorber under 365 nm and carrier recombination layer under 255 nm illumination,which can effectively modulate photoresponsivity at different ***,by designing the thicknesses of the NW layer,the photocurrent polarity reversal was successfully achieved in the constructed AlGaN/GaN NW PEC UV PD at two different light *** addition,by combining with platinum decoration,the photoresponse performance could be further *** work provides insight into transport mechanisms in the AlGaN/GaN NW PEC system,and offers a feasible and comprehensive strategy for further exploration of multifunctional optoelectronic devices.

关键词： GaN nanowires ultraviolet detection photoelectrochemistry photoresponse