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液态金属镶嵌半导体颗粒光电极中金属/半导体3D界面电子结构调控促进光电化学分解水

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Science China Materials 2024年第6期67卷 1804-1811页

作者：陈祥涛甄超邱建航李娜贾楠刘岗 Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

光电极通常由半导体吸光层和导电集流体两部分组成,两者间的界面电子结构直接影响导电集流体从半导体光吸收层中收集光生电荷的效率,尤其对于具有3D界面结构的液态金属镶嵌半导体颗粒的光电极.为此,本工作通过改变金属组分改变液态金属... 详细信息

光电极通常由半导体吸光层和导电集流体两部分组成,两者间的界面电子结构直接影响导电集流体从半导体光吸收层中收集光生电荷的效率,尤其对于具有3D界面结构的液态金属镶嵌半导体颗粒的光电极.为此,本工作通过改变金属组分改变液态金属的功函数,从而调节导电集流体与半导体吸光材料间3D界面的电子能带排列和接触类型,促进光生电荷的跨界面转移与收集,提升光电极的光电化学分解水活性.系统研究半导体与液态金属的功函数匹配关系发现,将ZnO颗粒嵌入铟锡(IT)低温液态金属中,会形成欧姆接触;而将其嵌入铋铟锡(BIT)低温液态金属中,则会形成肖特基接触.由于欧姆接触不存在肖特基接触的界面能垒而有利于光生电荷的跨界面转移与收集,因此,与铟锡低温液态金属镶嵌ZnO颗粒的光电极(IT/ZnO)相比铋铟锡低温液态金属镶嵌ZnO颗粒的光电极(BIT/ZnO)具有更为优异的电荷收集和分离能力,其光电化学分解水光电流密度可达0.62 mA cm^(-2),相比BIT/ZnO光电极的光电流密度(0.52 mA cm^(-2))提升了约19%,且在已报道的代表性ZnO光电极中处于前列.而与之相比,WO3、TiO_(2)或Cu2O因分别与IT和BIT形成相同的欧姆或肖特基型接触,两种低温液态金属镶嵌的WO3、TiO_(2)或Cu2O光电极具有几乎相同的光电催化活性.本工作展示了通过选择具有不同功函数的液态金属来改变金属/半导体接触类型以增强低温液态金属镶嵌半导体光电极性能的潜力,为规模化构建高效光电极提供了新的策略.

关键词： metal-embraced photoelectrodes 3D interfaces Oh-mic contact water splitting

Bifurcation analysis of modeling biodegradation of Microcystins

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International Journal of Biomathematics 2019年第3期12卷 91-108页

作者： Keying Song Wanbiao Ma Zhichao Jiang School of Mathematics and Physics University of Science and Technology Beijing Beijing 100083 P. R. China Beijing Key L aboratory for Magneto-photoelec trical Composite and Interface Science University of Science and Technology Beijing Beijing 100083 P. R. China Fundamental Science Department North China institute of Aerospace Engineering Langfang 065000 P. R. China

In this paper, a model with time delay describing biodegradation of Microcystins (MCs) is investigated. Firstly, the stability of the positive equilibrium and the existence of Hopf bifurcations are obtained. Furthermore, an explicit algorithm for determining the direction and the stability of the bifurcating periodic solutions is derived by using the normal form theory and center manifold argument. Finally, some numerical simulations are carried out to illustrate the applications of the results.

关键词： Microcystins biodegradation stability Hopf bifurcation permanence

Experimental studies of N^+ implantation into CVD diamond thin films

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Science China(Technological Sciences) 1997年第4期40卷 361-368页

作者：辛火平林成鲁王建新邹世昌石晓红林梓鑫周祖尧刘祖刚 National Laboratory of Functional Materials for Informatics Shanghai Institute of Metallurgy Chinese Academy of Sciences Shanghai 200050 China National Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China Ion Beam Laboratory Shanghai Institute of Metallurgy Chinese Academy of Sciences Shanghai 200050 China Department of Materials Science Shanghai University Shanghai 201800 China

The effects of N+ implantation under various conditions on CVD diamond films were analyzed with Raman spectroscopy, four-point probe method, X-ray diffraction (XRD), Rutherford backseattering spectroscopy (RBS), ultraviolet photoluminescence spectroscopy (UV-PL), Fourier transformation infrared absorption spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results show that the N+ implantation doping without any graphitization has been successfully realized when 100 keV N+ ions at a dosage of 2 × 1016 cm-2 were implanted into diamond films at 550℃ . UV-PL spectra indicate that the implanted N+ ions formed an electrically inactive deep-level impurity in diamond films. So the sheet resistance of the sample after N+ implantation changed little. Carbon nitride containing C≡N covalent bond has been successfully synthesized by 100 keV, 1.2×1018 N/cm2 N+ implantation into diamond films. Most of the implanted N+ ions formed C≡N covalent bonds with C atoms. The others were free state

关键词： N+ implantation into diamond films Raman spectroscopy ultraviolet photoluminescence spec-troscopy (UV-PL) electrically inactive deep-level impurity C≡N covalent bond carbon nitride X-ray photoelec-tron spectroscopy (XPS). N+ implantation

Laser-assisted XUV double ionization of helium atoms:Intensity dependence of joint angular distributions

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Chinese Physics B 2020年第7期29卷 281-285页

作者：朱风筝黎根刘爱华 institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China School of Mathematics and Physics Hubei Polytechnic UniversityHuangshi 435003China

We investigate the intensity effect of ultrashort assisting infrared laser pulse on the single-XUV-photon double ionization of helium atoms by solving full six-dimensional time-dependent Schrodinger equation with implement of finite element discrete variable *** studies of joint energy distributions and joint angular distributions of the two photoelectrons reveal the competition for ionized probabilities between the photoelectrons with odd parity and photoelectrons with even parity in single-XUV-photon double ionization process in the presence of weak infrared laser field,and such a competition can be modulated by changing the intensity of the weak assisting-IR laser *** emission angles of the two photoelectrons can be adjusted by changing the laser parameters as *** depict how the assisting-IR laser field enhances and/or enables the back-to-back and side-by-side emission of photoelectrons created in double ionization process.

关键词： laser-assisted double photoionization helium atom angular distribution

Sputtering Deposition of Ultra-thin α-Fe_2O_3 Films for Solar Water Splitting

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Journal of Materials Science & Technology 2015年第6期31卷 655-659页

作者： Lichao Jia Karsten Harbauer Peter Bogdanoff Kluas Ellmer Sebastian Fiechter Helmholtz-Zentrum Berlin fr Materialien und Energie Institute for Solar FuelsHahn-Meitner-Platz 114109 BerlinGermany

Ultra-thin α-Fe2O3（hematite） films have been deposited by radio frequency（RF） sputtering technique and photoelectrochemically investigated towards their ability to oxidize *** varying the deposition power and time as well as the sputter gas flow（argon）,the microstructure and morphology of the film were *** was found that the increment in the film thickness resulted in the loss of efficiency for solar water *** film with a thickness of 27 nm exhibited the best result with a maximum photocurrent of 0.25 mA cm-2at 1.23 *** of small amounts of O2to the sputter gas improved the photoactivity significantly.

关键词： Thin film Aematite Sputtering deposition photoelec

2D/2D covalent organic framework/CdS Z-scheme heterojunction for enhanced photocatalytic H_(2) evolution:Insights into interfacial charge transfer mechanism

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Journal of Materials Science & Technology 2023年第6期137卷 223-231页

作者： Ruiqi Gao Junxian Bai Rongchen Shen Lei Hao Can Huang Lei Wang Guijie Liang Peng Zhang Xin Li institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053China State Centre for International Cooperation on Designer Low-Carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Covalent organic frameworks(COFs)with high crystallinity and flexible designability have been consid-ered as promising candidates for photocatalytic hydrogen ***,the existence of unpropi-tious exciton effects in COFs leads to poor charge separation,and thus results in low photocatalytic ***,to improve the photoelectron migration efficiency,we designed a 2D/2D organic/inorganic direct Z-scheme COF-based heterojunction(TpTAP/CdS),by the in-situ growing of CdS nanosheets on the COF copolymerized via 2,4,6-tris(4-aminophenyl)-1,3,5-triazine(TAP)and 1,3,5-triformylphloroglucinol(Tp).The femtosecond transient absorption(fs-TA)decay kinetics of TpTAP-COF and TpTAP/CdS further reveal the processes of shallow electron trapping and the recombination of the free photogenerated electron-hole *** particular,the transient absorption traces for TpTAP-COF and TpTAP/CdS normal-ized to the photoinduced absorption peak can effectively verify the Z-scheme charge transfer between TpTAP-COF and CdS,which could enhance the charge mobility and separation,thus reducing the pho-tocorrosion of ***,ultraviolet photoelectron spectroscopy(UPS),in-situ X-ray photoelec-tron spectroscopy(XPS),transient photovoltage measurements,and electron spin resonance(ESR)spec-troscopy further confirm the establishment of the internal electric field(IEF).This work demonstrates the important role of COFs in the construction of 2D/2D organic/inorganic direct Z-scheme heterojunctions and offers a new avenue to explain the criticality of dynamics of the photogenerated carriers for the construction of Z-scheme heterojunctions.

关键词： Femtosecond transient absorption Photocatalytic hydrogen evolution Covalent organic frameworks(COFs) Direct Z-scheme heterojunction CdS

Preparation of TiO_2/ITO film electrode by AP-MOCVD for photoelectrocatalytic application

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Science China Chemistry 2012年第11期55卷 2462-2470页

作者： HAN Song ZHANG XingWang YU QingNi LEI LeCheng institute of Industrial Ecology and Environment Department of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China China Astronaut Research and Training Center Beijing 100094China

Titanium dioxide (TiO2 ) thin films were grown onto Indium tin oxide (ITO) glass under atmospheric pressure by chemical vapor deposition (AP-MOCVD) using titanium tetraisopropoxide astitanium precursor. The as-prepared TiO2 /ITO films were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and photoelectrochemical measurements. Their photocatalytic (PC) and photoelectrocatalytic (PEC) activities were evaluated based on the results of methyl orange dye (MO) degradation experiments in aqueous solution. The difference between the front side (EE, electrolyte/electrode interface) and the back side (SE, substrate/electrode interface) illumination was evaluated in both photocurrent and MO degradation experiments. The effect of the film thickness on degradation rate by PEC under the two illumination directions was also studied. Stability of TiO2 /ITO film electrode was investigated in repetitive degradation experiments. Overall, the TiO2 /ITO film with thickness ranging from 321 to1440 nm deposited by MOCVD method is an effective photoelectrode for MO degradation under SE illumination in PEC reaction system.

关键词：薄膜电极光电应用 X-射线光电子能谱制备 MOCVD法扫描电子显微镜透射电子显微镜 X-射线衍射

Rationally Design of Near Infrared Light Responsive Micro-photoelectrodes for In Vivo Sensing of Neurotransmitter Molecules in Mouse Brain

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Chinese Journal of Chemistry 2020年第3期38卷 275-281页

作者： Yina Zhao Wenlong Wu Baihe Fu Liyong Gan Zhonghai Zhang Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal University500 Dongchuan RoadShanghai 200241China institute for Structure and Function and Deportment of Physics Chongqing UniversityChongqing 400030China

The accurate quantification of neurotransmitter molecules is an indispensable means to reveal the physiological mechanisms of neuro movement in molecular ***,existing detection strategies cannot fully meet practical needs,and the on-site and in vivo detection of neurotransmitters in brain remains a great ***,we report the development of a near infrared light responsive photo-electrochemical(PEC)detection method for in vivo quantification of neurotransmitter dopamine in mouse *** guidance of density function theory calculations,a combination strategy of non-metal cation doping and defect engineering is introduced to rationally design the micro-photoelec-trodes with excellent biocompatibility and stability and implements the in vivo PEC detection of dopamine in mouse *** opens up a new way for the accurate in vivo detection of biomolecules and allows researchers to make novel inquiries for long-standing questions in a new way.

关键词： Infrared Rational vivo

Magnetic and XPS studies of lithium lanthanide tetraphosphates LiLnP_4O_(12)(Ln=Nd,Gd,Er)

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Journal of Rare Earths 2013年第5期31卷 485-489页

作者： D.Petrov B.Angelov V.Lovchinov Department of Physical Chemistry Plovdiv University"Paisii Hilendarski" 24 Tsar Asen Str. 4000 Plovdiv Bulgaria Department of Inorganic and Physical Chemistry University of Food Technologies-Plovdiv26 Maritsa Blvd. 4002 Plovdiv Bulgaria institute of Solid State Physics Bulgarian Academy of Sciences72Tsarigradsko Chaussee Blvd.1784 SofiaBulgaria

Magnetic susceptibilities of flux-grown single crystals of LitnP4012 （Ln=Nd, Gd, Er） were measured in the temperature range of 2-300 K. The compounds were paramagnetic, and obeyed the Curie-Weiss law in the entire temperature interval, without magnetic phase transitions, and with effective magnetic moments close to those of the corresponding free Ln3＋ ions. X-ray photoelec- tron spectroscopy was applied to determine the positions of core-level electrons relative to the Fermi level： Li is; Ln 4f, 5p, 5s, 4d, 3d; P 2s, 2p; O 1s, 2s. The binding energies in these compounds were found slightly shifted compared to the respective values of the same elements.

关键词： lithium lanthanide tetraphosphates single crystals magnetic properties XPS spectroscopy rare earths