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Observing suppressed polarization in flexible ferroelectric negative capacitance field effect transistors

Journal of Materiomics 2024年第4期10卷 762-769页

作者： Chuanlai Ren Liyufen Dai Congbing Tan Guangtong Yuan Ke Qu Jinbin Wang Xiangli Zhong mingqiang huang Jiyan Dai Gaokuo Zhong Jiangyu Li Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen518055GuangdongChina Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen518055GuangdongChina School of Materials Science and Engineering Xiangtan UniversityXiangtan411105HunanChina School of Physics and Electronics Hunan University of Science and TechnologyXiangtan411201HunanChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen518055GuangdongChina Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong999077China

Negative capacitance(NC)has the potential to enable low power microelectronics beyond the fundamental thermionic limit,and it has been theorized that the thermodynamically unstable NC of ferroelectrics can be stabilized by linear dielectric,making negative capacitance ferroelectric field effect transistors(NC-FeFET)***,the validity of NC as a physical concept for ferroelectrics remain contentious despite numerous theoretical and experimental investigations,and the intrinsic ferroelectric NC with suppressed polarization has not been demonstrated except locally at vortex *** NC-FeFET with subthreshold swing(SS)lower than 60 mV/dec limit has been reported,such device characteristics has not been directly connected to suppressed polarization at materials’level,and alternative mechanisms other than NC have also been *** we demonstrate stable sub-60 mV/dec SS with hysteresis free Isingle bondV in NC-FeFET based on SrTiO_(3)/Pb(Zr_(0.1)Ti_(0.9))O_(3)/SrTiO_(3) heterostructure,and observe its suppressed polarization at both macroscopic and microscopic *** intrinsic ferroelectric NC thus is experimentally confirmed and directly connected to NC-FeFET performance,and the mica-based device is also highly flexible and robust under cyclic bending as well as extended heating.

关键词： Negative capacitance field-effect transistors Ferroelectric Pulse laser deposition Mica

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Oxidative lactonization of C(sp^(3))–H bond in methyl aromatic alcohols enabled by proton-coupled electron transfer

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Science China Chemistry 2022年第8期65卷 1526-1531页

作者： Shanyi Chen Qihong Lai Chao Liu Hui Liu mingqiang huang Shunyou Cai Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology School of ChemistryChemical Engineering and EnvironmentMinnan Normal UniversityZhangzhou 363000China Guangdong Provincial Key Laboratory of Chemical Genomics School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055China

Direct functionalization of inert C(sp^(3))–H bonds in pharmaceutically significant compounds is very important in modern synthetic organic *** this article,we disclose a practical and efficient method for the oxidative lactonization of benzylic C(sp^(3))–H bonds enabled by the synergistic interactions of organic dye-type rose bengal,n-Bu_(4)N∙Br,O_(2) and Na_(2)HPO_(4) under visible light *** reaction does not require transition metal catalysts or strong oxidants.A range of structurally diverse phthalides has been synthesized with excellent selectivity and high functional group *** late-stage application of this reaction to the preparation of structurally complex phthalides demonstrates its synthetic utility.

关键词： photoredox catalyst metal free singlet oxygen bromine radical dehydrogenated lactonization

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Size distribution and chemical composition of secondary organic aerosol formed from Cl-initiated oxidation of toluene

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Journal of Environmental Sciences 2012年第5期24卷 860-864页

作者： mingqiang huang Weijun Zhang Xuejun Gu Changjin Hu Weixiong Zhao Zhenya Wang Li Fang Key Laboratory of Atmospheric Composition and Optical Radiation Anhui Institute of Optics&Fine MechanicsChinese Academy of SciencesHefei 230031China Laboratory of Environment Spectroscopy Anhui Institute of Optics&Fine MechanicsChinese Academy of SciencesHefei 230031China Department of Environmental Science and Engineering Xiamen UniversityTan Kah Kee CollegeZhangzhou 363105China

Secondary organic aerosol （SOA） formed from Cl-initiated oxidation of toluene was investigated in a home-made smog chamber. The size distribution and chemical composition of SOA particles were measured using aerodynamic particle sizer spectrometer and the aerosol laser time-of-flight mass spectrometer （ALTOFMS）, respectively. According to a large number of single aerosol diameter and mass spectra, the size distribution and chemical composition of SOA were obtained statistically. Experimental results showed that SOA particles created by Cl-initiated oxidation of toluene is predominantly in the form of fine particles, which have diameters less than 2.5 μm （i.e., PM2.5）, and glyoxal, benzaldehyde, benzyl alcohol, benzoquinone, benzoic acid, benzyl hydroperoxide and benzyl methyl nitrate are the major products components in the SOA. The possible reaction mechanisms leading to these products are also proposed.

关键词： toluene Cl-initiated oxidation secondary organic aerosol smog chamber laser desorption/ionization

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Experimental study of photooxidation products of ethylbenzene

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Journal of Environmental Sciences 2010年第10期22卷 1570-1575页

作者： mingqiang huang Weijun Zhang Liqing Hao Zhenya Wang Li Fang Ruihong Kong Xiaobin Shan Fuyi Liu Liusi Sheng Key Laboratory of Atmospheric Composition and Optical Radiation Anhui Institute of Optics & Fine Mechanics Chinese Academy of Sciences Hefei 230031 China. Laboratory of Environment Spectroscopy Anhui Institute of Optics & Fine Mechanics Chinese Academy of Sciences Hefei 230031 China Department of Environmentul Science and Engineering Xiamen University Tan Kah Kee College Zhangzhou 363105 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China

Smog chamber experiments were performed to investigate the composition of products formed from photooxidation of aromatic hydrocarbon ethylbenzene. Vacuum ultraviolet photoionization mass spectrometer and aerosol time-of-flight mass spectrometer were used to measure the products in the gas and particle phases in real-time. Experimental results demonstrated that ethylphenol, methylglyoxal, phenol, benzaldehyde, and 2-ethylfurane were the predominant photooxidation products in both the gas and particle phases. However, there were some differences between detected gas phase products and those of particle phase, for example, 2-ethylfurane, ethylglyoxylic acid, nitroethylbenzene, 3,4-dioxopentanal and ethyl-nitrophenol were only existing in the particle-phase. The possible reaction mechanisms leading to these products were also discussed and proposed.

关键词： ethylbenzne secondary organic aerosol smog chamber desorption/ionization reaction mechanism

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Characterization of particulate products for aging of ethylbenzene secondary organic aerosol in the presence of ammonium sulfate seed aerosol

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Journal of Environmental Sciences 2016年第9期28卷 219-229页

作者： mingqiang huang Jiahui Zhang Shunyou Cai Yingmin Liao Weixiong Zhao Changjin Hu Xuejun Gu Li Fang Weijun Zhang College of Chemistry & Environment Minnan Normal University Zhangzhou 363000 China Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology Zhangzhou 363000 China Department of Environmental Science and Engineering Xiamen University Tan Kah Kee College Zhangzhou 363105 China Laboratory of Atmospheric Physico-Chemistry Anhui Institute of Optics and Fine Mechanics Chinese Academy of SciencesHefei 230031 China

Aging of secondary organic aerosol（SOA） particles formed from OH– initiated oxidation of ethylbenzene in the presence of high mass（100–300 μg/m^3） concentrations of（NH_4）_2SO_4seed aerosol was investigated in a home-made smog chamber in this *** chemical composition of aged ethylbenzene SOA particles was measured using an aerosol laser time-of-flight mass spectrometer（ALTOFMS） coupled with a Fuzzy C-Means（FCM） clustering *** results showed that nitrophenol,ethyl-nitrophenol,2,4-dinitrophenol,methyl glyoxylic acid,5-ethyl-6-oxo-2,4-hexadienoic acid,2-ethyl-2,4-hexadiendioic acid,2,3-dihydroxy-5-ethyl-6-oxo-4-hexenoic acid,1H-imidazole,hydrated N-glyoxal substituted1H-imidazole,hydrated glyoxal dimer substituted imidazole,1H-imidazole-2-carbaldehyde,N-glyoxal substituted hydrated 1H-imidazole-2-carbaldehyde and high-molecular-weight（HMW） components were the predominant products in the aged *** to the previous aromatic SOA aging studies,imidazole compounds,which can absorb solar radiation effectively,were newly detected in aged ethylbenzene SOA in the presence of high concentrations of（NH_4）_2SO_4seed *** findings provide new information for discussing aromatic SOA aging mechanisms.

关键词： Ethylbenzene Secondary organic aerosol(NH_4)_2SO_4 seed aerosol Laser desorption/ionization Fuzzy clustering(FCM) algorithm Aging mechanism

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苯系物二次有机气溶胶金属有机络合物组分的表征实验研究

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环境科学学报 2024年第8期44卷 159-169页

作者：曾志威黄明强朱敏聪张丽梅赵卫雄胡长进顾学军张为俊闽南师范大学化学化工与环境学院福建省现代分离分析科学与技术重点实验室漳州363000 中国科学院安徽光学精密机械研究所大气物理化学实验室合肥230031

大气二次有机气溶胶(SOA)金属有机络合物组分具有较强的吸光能力和生物毒性,可加重灰霾污染,危害人体健康.本文利用烟雾箱系统模拟氯化铁细粒子存在时,苯系物大气化学过程产生SOA粒子,采用在线质谱和离线光谱表征金属有机络合物的化学... 详细信息

大气二次有机气溶胶(SOA)金属有机络合物组分具有较强的吸光能力和生物毒性,可加重灰霾污染,危害人体健康.本文利用烟雾箱系统模拟氯化铁细粒子存在时,苯系物大气化学过程产生SOA粒子,采用在线质谱和离线光谱表征金属有机络合物的化学组分和光学性质.气溶胶激光飞行时间质谱在线测量和电喷雾电离质谱的离线验证表明,邻苯二酚类合铁(III)、二邻苯二酚类合铁(III)、二氯邻苯二酚类合铁(III)是苯系物SOA粒子主要的金属有机络合物组分.氯化铁细粒子存在时,苯系物SOA粒子的吸光能力显著增强,并具有荧光特性,最大激发和发射波长约为λ_(ех)/λ_(em)=704 nm/740 nm. SOA在200~1000 nm范围内的平均质量吸收系数()在186~732 cm^(2)·g^(-1)之间.苯环上存在甲基和乙基等取代基时,空间位阻效应阻碍OH自由基加成到苯环上.乙烯基存在时,其C=C键与苯环C=C键形成共轭双键,乙烯基电子离域到苯环上,使其电子云密度显著增强,加合反应更易发生.苯系物SOA粒子质量浓度、、发射740 nm荧光强度呈现1,2,4-三甲苯<对-二甲苯<甲苯<乙苯<苯<苯乙烯的规律.这为大气人为源SOA金属有机络合物化学组分和光学性质研究提供了实验参考和依据.

关键词：二次有机气溶胶金属有机络合物苯系物氯化铁光学特性

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城市污泥腐殖酸有机肥对油菜生长发育及土壤性质的影响

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现代农业科技 2024年第1期 49-52页

作者：朱敏聪王伟超胡惠敏黄明强闽南师范大学化学化工与环境学院福建漳州363000

以漳州东墩生活污水处理厂的城市污泥为原料,利用超声辅助碱破解法提取腐殖酸,添加到鸡粪中制备污泥腐殖酸有机肥,并开展其对油菜生长发育及土壤性质的影响研究。结果表明,城市污泥腐殖酸有机肥作底肥能够提高油菜可溶性糖、VC含量,降... 详细信息

以漳州东墩生活污水处理厂的城市污泥为原料,利用超声辅助碱破解法提取腐殖酸,添加到鸡粪中制备污泥腐殖酸有机肥,并开展其对油菜生长发育及土壤性质的影响研究。结果表明,城市污泥腐殖酸有机肥作底肥能够提高油菜可溶性糖、VC含量,降低硝酸盐含量,从而提升油菜品质,但不会对油菜产生重金属累积危害。城市污泥腐殖酸有机肥具有较好的培肥效应,可提高土壤有机质、全磷和全氮含量,短期施用之后不会造成土壤重金属污染。本研究结果可为城市污泥腐殖酸有机肥在油菜等蔬菜种植中推广使用提供试验依据。

关键词：油菜城市污泥腐殖酸有机肥生长发育土壤性质

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A VUV photoionization mass spectrometric study on the OH-initiated photooxidation of isoprene with synchrotron radiation

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Journal of Environmental Sciences 2012年第12期24卷 2075-2082页

作者： Gang Pan Changjin Hu mingqiang huang Zhenya Wang Yue Cheng Zhi Liu Weixiong Zhao Weijun Zhang Jun Chen Fuyi Liu Xiaobin Shan Liusi Sheng Key Laboratory of Atmospheric Composition and Optical Radiation Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China Laboratory of Enviromental Spectroscopy nhui Irritate of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China Department of Environental Science and Engineer'in Xiamen University Tan Kah Kee College ~Zt~angzhou 3'631~05 China National Synchrotron Radiation Laboratory School of Nuclear Science and Technology University of Science and Technology of China Hefei 230029 China

The gas-phase organic compounds resulting from OH-initiated photooxidation of isoprene have been investigated on-line by VUV photoiortization mass spectrometry based on synchrotron radiation for the first time. The photoionization efficiency curves of the corresponding gaseous products as well as the chosen standards have been deduced by gating the interested peaks in the photoionization mass spectra while scanning the photon energy simultaneously, which permits the identification of the pivotal gaseous products of the photooxidation of isoprene, such as formaldehyde （10.84 eV）, formic acid （11.38 eV）, acetone （9.68 eV）, glyoxal （9.84 eV）, acetic acid （10.75 eV）, methacrolein （9.91 eV）, and methyl vinyl ketone （9.66 eV）. Proposed reaction mechanisms leading to the formation of these key products were discussed, which were completely consistent with the previous works of different groups. The capability of synchrotron radiation photoionization mass spectrometry to directly identify the chemical composition of the gaseous products in a simulation chamber has been demonstrated, and its potential application in related studies of atmospheric oxidation of ambient volatile organic compounds is anticipated.

关键词： isoprene photooxidation smog chamber VUV photoionization mass spectrometry synchrotron radiation

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Ultraconformable Integrated Wireless Charging Micro-Supercapacitor Skin

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Nano-Micro Letters 2024年第7期16卷 46-58页

作者： Chang Gao Qing You Jiancheng huang Jingye Sun Xuan Yao mingqiang Zhu Yang Zhao Tao Deng School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044People’s Republic of China School of Microelectronics Tianjin UniversityTianjin 300072People’s Republic of China Key Laboratory of Cluster Science Ministry of Education of China Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China

Conformable and wire-less charging energy storage devices play important roles in enabling the fast development of wearable,non-contact soft ***,current wire-less charging power sources are still restricted by limited flexural angles and fragile connection of components,resulting in the failure expression of performance and constraining their fur-ther applications in health monitoring wearables and moveable artificial ***,we present an ultracompatible skin-like integrated wireless charging micro-supercapacitor,which building blocks(including electrolyte,electrode and substrate)are all evaporated by liquid *** to the infiltration and permeation of the liquid,each part of the integrated device attached firmly with each other,forming a compact and all-in-one *** addition,benefitting from the controllable volume of electrode solution precursor,the electrode thickness is easily regulated varying from 11.7 to 112.5μ*** prepared thin IWC-MSC skin can fit well with curving human body,and could be wireless charged to store electricity into high capacitive micro-supercapacitors(11.39 F cm-3)of the integrated *** believe this work will shed light on the construction of skin-attachable electronics and irregular sensing microrobots.

关键词： Micro-supercapacitor Electronic skin Supercapacitor skin Wireless charging energy storage device

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Effect of illumination intensity and light application time on secondary organic aerosol formation from the photooxidation of α-pinene

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Journal of Environmental Sciences 2009年第4期21卷 447-451页

作者： LIU Xianyun, ZHANG Weijun, huang mingqiang, WANG Zhenya, HAO Liqing, ZHAO Wenwu Laboratory of Environment Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Hefei 230031, China. [a]Laboratory of Environment Spectroscopy Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China

Secondary organic aerosol （SOA） formation from hydroxyl radical （OH.） initiated photooxidation of α-pinene was investigated in a home-made smog chamber. The size distribution of SOA particles was measured using aerodynamic particle sizer spectrometer. The effects of illumination intensity and light application time on SOA formation for α-pinene were evaluated. Experimental results show that the concentration of SOA particles increased significantly with an increasing of illumination intensity, and the light application time, the concentration, and the size of SOA particles were also increased. In addition, the factors influencing the formation of SOA were discussed. In addition, this article compared the effect of α-pinene with that of toluene, and discussed the contribution of α-pinene to SOA formation.

关键词： α-pinene hydroxyl radical secondary organic aerosol size distribution

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