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Effects of hydrostatic pressure and temperature on the nonlinear optical properties of semiparabolic plus semi-inverse squared quantum wells

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Communications in Theoretical Physics 2021年第8期73卷 139-145页

作者： Guo-Liang Xu Zi Zhen Yi-Sheng Shi Kang-Xian Guo E Feddi Jian-Hui Yuan Zhi-Hai Zhang School of Physics and Electronics Yancheng Teachers UniversityYancheng 224002China Department of Physics College of Physics and Electronic EngineeringGuangzhou UniversityGuangzhou 510006China Laboratoire de la matiere condensee et Sciences Interdisciplinaires(LAMCScI) Group of Optoelectronic of Semiconductors and NanomaterialsENSETMohammed V University in RabatMorocco Laboratory of Biomedical Photonics and Engineering Guangxi Medical UniversityNanning 530021China

In this study,the effects of hydrostatic pressure and temperature on nonlinear optical rectification(OR),second-harmonic generation(SHG),third-harmonic generation(THG)and the linear,nonlinear,and total optical absorption coefficients(OACs)of a semiparabolic plus semi-inverse squared quantum well(QW)are theoretically *** results show that hydrostatic pressure and temperature have significant effects on the optical properties of semiparabolic plus semi-inverse squared QWs,and that the energy levels and magnitudes of the resonant peaks of OR,SHG,THG,and the total OACs vary according to the shape of the limiting potential,the hydrostatic pressure,and the *** is easily seen that the peak positions of the resonant peaks of OR,SHG,THG,and the total OACs in the semiparabolic plus semi-inverse squared QW show a red shift with increasing hydrostatic pressure,but a blue shift with increasing ***,the magnitude and position of the resonant peaks of OR,SHG,THG,and the total OACs can be adjusted by changing the hydrostatic pressure and the temperature,which promise a new degree of freedom in the tunability of various electro-optical devices.

关键词： Quantum well Optical properties Hydrostatic pressure Temperature

Synthesis,Crystal Structure and Photophysical Property of 2-(9H-carbazol-9-yl)-3-(2-(2,4,5-tri-(9H-carbazol-9-yl)-3,6-dicyanophenoxy)phenoxy)dibenzo[b,e][1,4]dioxine-1,4-dicarbonitrile

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Chinese Journal of Structural Chemistry 2018年第9期37卷 1433-1439页

作者：董亚芳余荣民卢灿忠 College of Chemistry Fuzhou University CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

A purely organic compound 2-（9 H-carbazol-9-yl）-3-（2-（2,4,5-tri-（9 H-carbazol-9-yl）-3,6-dicyanophenoxy）phenoxy）dibenzo[b,e][1,4]dioxine-1,4-dicarbonitrile, C76 H40 N8 O4, was synthesized and characterized by NMR, UV-Vis, photoluminescenceand X-ray single-crystal structure analysis. The compound crystallizes in monoclinic system, space group P21/n with a = 11.6537（3）, b = 34.9738（8）, c = 15.5053（3）？, β =101.992（2）°, V = 6181.6（2）？3, Z = 4, Mr= 1129.18 g/mol, Dc =1.396 g/cm3, F（000） =2672, μ = 2.239 mm–1, GOOF = 1.019, the final R = 0.0577 and wR= 0.1559 for 11925 observed reflections with I 〉2σ（I）. The UV-vis absorption and fluorescence of the compound were discussed. The compound exhibitsyellow-green luminescence with maximum emission peak at 538 nm, and quantum yields of ф = 0.25 and 0.48 in air-equilibrated and degassed toluene at room temperature. Transient decay spectral studies show that compound 1 displays two component decay fashions with a short decay lifetime of 23 ns for the prompt fluoresce anda long decay lifetime of 3.8ms for thermally activated delayed fluorescence. In air-equilibrated toluene, only a short decay lifetime of 17 ns was *** experimental and computational results show thatthe emission of the compound originates from the CT excited states.

关键词： purely organic compound synthesis crystal structure luminescence DFT calculation

Synthesis,Crystal Structure,and Photo-and Electro-luminescence of a TADF Cu(Ⅰ)Complex

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Chinese Journal of Structural Chemistry 2017年第9期36卷 1493-1501页

作者：林玲陈旭林陈东徽吴小园余荣民卢灿忠 Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of Sciences Graduate University of Chinese Academy of Sciences

A four-coordinate mononuclear cuprous complex [Cu（ac1m）POP]BF4·0.5（C6H14）· 0.5（C2H5OH）（1, ac1 m = 2-（2-ethoxyphenyl）-1-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline, POP = bis[2-（dipenylphosphino）phenyl]ether） was synthesized and characterized by elemental analysis, NMR, UV-vis, cyclic voltammetry and X-ray single-crystal structure analysis. It crystallizes in monoclinic space group P21/c with a = 17.0546（19）, b = 15.4650（17）, c = 23.685（2） A, β = 104.007（11）°, V = 6061.1（12）A^3, Z = 4, Mr = 1171.46, Dc = 1.284 g/cm^3, F（000） = 2432, μ = 1.50 mm^–1, GOOF = 1.070, the final R = 0.059 and wR = 0.1640 for 8952 observed reflections with I 〉 2σ（Ⅰ）. Compound 1 is composed of a BF4-anion and a [Cu（ac1m）POP]^＋ cation. The Cu（Ⅰ） ion adopts a tetrahedral coordination geometry defined by two nitrogen and two phosphorous atoms. The complex exhibits yellow luminescence with maximum emission peaks at 546 nm, lifetimes 15.1 μs and quantum yields（ф = 0.130） at room temperature. The complex displays thermally activated delayed fluorescence（TADF） at room temperature, which is proved experimentally and theoretically. And the organic light-emitting diode（OLED） with 1 as the light emitting material has the maximum current efficiency of 5.86 cd/A and the highest brightness of 3215 cd/m^2.

关键词： Cu(Ⅰ) complex, crystal structure, TADF, DFT calculation, OLED

Construction of AIEgen functionalized nanomicelles and their stability study through‘seesaw-like'fluorescence changes

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Chinese Chemical Letters 2023年第6期34卷 382-386页

作者： Xiaotong Wang Shizhu Chen Yaru Jia Kaihan Zhang Lili Ma Luwei Li Xingjie Liang Jinchao Zhang College of Chemistry and Environmental Science Chemical Biology Key Laboratory of Hebei ProvinceKey Laboratory of Medicinal Chemistry and Molecular Diagnosis of the Ministry of EducationHebei UniversityBaoding 071002China CAS Key Laboratory for Biomedical Effects of nanomaterials and Nanosafety CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology of ChinaBeijing 100190China Department of Chemistry The University of ManchesterManchester M139PLUnited Kingdom

As nanocarriers,nanomicelles play vital roles in the toolbox of drug *** stability of nanomicelles affects the nanomedicines'***,it is important to understand the stability of nanomicelles for further ***,we report a strategy to construct new nanomicelles(NM)by introducing aggregation-induced emission(AIE)functional group tetraphenylethylene(TPE)in the component polymer vitamin E(D-α-tocopheryl polyethylene glycol 1000 succinate)(TPGS).The stability of doxorubicin(DOX)loaded nanomicelles DOX@NM in different conditions was studied by fluorescence *** fluorescence changes of DOX@NM are‘seesaw-like'when they transform between assembled and disassembled *** the assembled form,TPE gives emission from AIE effect,while in the disassembled form,the fluorescence of DOX is observed due to the disappearance of ACQ effect.

关键词： Polymer nanomicelles Aggregation-induced emission Fluorescence ratio Stability Drug delivery system

Sandwich-structured nanocomposites of N-doped graphene and nearly monodisperse Fe304 nanoparticles as high-performance Li-ion battery anodes

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Nano Research 2017年第9期10卷 2923-2933页

作者： Wen Qi Xuan Li Hui Li Weikang Wu Pei Li Ying Wu Chunjiang Kuang Shaoxiong Zhou Xiaolin Li Beijing Key Laboratory of Energy nanomaterials Advance Technology & Materials Co. Ltd. China Iron & Steel Research Institute Group Beijing 10008 I China School of Materials Science and Engineering Tianjin University Tianjin 300072 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China Department of Stationary Energy Storage Pacific Northwest National Laboratory Richland Washington 99354 USA

Iron oxides have attracted considerable interest as abundant materials for high-capacity Li-ion battery anodes. However, their fast capacity fading owing to poorly controlled reversibility of the conversion reactions greatly hinders their application. Here, a sandwich-structured nanocomposite of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles were developed as high-performance Li-ion battery anode. N-doped graphene serves as a conducting framework for the self-assembled structure and controls Fe3O4 nucleation through the interaction of N dopants, surfactant molecules, and iron precursors. Fe3O4 nanoparticles were well dispersed with a uniform diameter of ~15 nm. The unique sandwich structure enables good electron conductivity and Li-ion accessibility and accommodates a large volume change. Hence, it delivers good cycling reversibility and rate performance with a capacity of ~1,227 mA·h·g–1 and 96.8% capacity retention over 1,000 cycles at a current density of 3 A·g–1. Our work provides an ideal structure design for conversion anodes or other electrode materials requiring a large volume change.

关键词： N-doped graphene iron oxides self-assembly Li-ion battery density functional theory

Synthesis,Crystal Structure and Photoluminescence of a TADF Cuprous Complex

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Chinese Journal of Structural Chemistry 2018年第11期37卷 1749-1755页

作者：甘学敏吴小园余荣民卢灿忠 CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences Graduate University of Chinese Academy of Sciences

A four-coordinate mononuclear cuprous complex oCBP-Cu-Pym(1, oCBP =1,2-bis(diphenylphosphine)-nido-carborane, Pym = 2-methyl-6-(1 H-pyrazol-1-yl)pyridine) was synthe-sized and characterized by elemental analysis, NMR, UV-Vis and X-ray single-crystal structure analysis. It crystallizes in monoclinic space group C2/c with a = 28.4182(8), b =16.2994(4), c = 22.2708(5) ?, β = 127.219(2)°, V = 8214.8(3) ?3, Z = 8, Mr = 766.92, ρcalc = 1.24 g/cm3, F(000) = 3160, μ = 2.30 mm–1, GOOF = 1.063, the final R = 0.0700 and wR = 0.1903 for7158 observed reflections with I > 2σ(I). The Cu(I) ion adopts a highly distorted tetrahedral geometry defined by two nitrogen and two phosphorous atoms. Under UV 365 nm at room temperature, this complex exhibits green emission with maximum emission peak at 516 nm,lifetime 32.4 μs and quantum yield(ф = 0.461) in the solid state. Photophysical investigation suggests that the emission of complex 1 at room temperature was attributed to TADF, which is strongly supported by theoretic calculation.

关键词： Cu(Ⅰ) complex crystal structure TADF DFT calculation

Enhanced performance of a solar cell based on a layer-by-layer self-assembled luminescence down-shifting layer of core–shell quantum dots

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Chinese Physics B 2018年第12期27卷 461-465页

作者：刘妮李淑鑫叶迎春姚延立 College of Aeronautical Engineering Binzhou UniversityBinzhou 256603China Anhui Key Laboratory of nanomaterials and Technology and Key Laboratory of Materials Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

In this paper, core–shell quantum dots（QDs） with two polar surface functional groups（ZnSe/ZnS–COOH QDs and ZnSe/ZnS–NH;QDs） are synthesized in an aqueous phase. Photoluminescence（PL） and absorption spectra clearly indicate luminescence down-shifting（LDS） properties. On the basis of QDs, surface functional group multilayer LDS films（MLDSs） are fabricated through an electrostatic layer-by-layer（LBL） self-assembly method. The PL intensity increases linearly with the number of bilayers, showing a regular and uniform film growth. When the M-LDS is placed on the surface of a Si-based solar cell as an optical conversion layer for the first time, the external quantum efficiency（EQE） and shortcircuit current density（Jsc） notably increases for the LDS process. The EQE response improves in a wavelength region extending from the UV region to the blue region, and its maximum increase reaches more than 15% between 350 nm and 460 nm.

关键词： two-surface functional group LBL self-assembly LDS

Nitric oxide mediated Staphylococcus aureus pathogenesis and protective role of nanoconjugated vancomycin

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Asian Pacific Journal of Tropical Biomedicine 2011年第2期1卷 102-109页

作者： Subhankari Prasad Chakraborty Santanu Kar Mahapatra Sumanta Kumar Sahu Sourav Chattopadhyay Panchanan Pramanik Somenath Roy Immunology and Microbiology laboratory Department of Human Physiology with Community HealthVidyasagar University nanomaterials Laboratory Department of ChemistryIndian Institute of Technology

Objective:To investigate the relation between fruit seeds,plants residuals and appendicitis. Methods:Among cases that underwent appendectomy,the appendicitis cases having fruit seeds and undigested plant residuals in their etiology were examined ***, histopathological features,age,sex,and parameters of morbidity and mortality were used. Results:Fruit seed was found in one case(0.05%) with presence of pus in appendix lumen, undigested plant residuals in 7 cases(0.35%).It was determined that there were appendix inflammation in 2 of the plant residuals cases,while there were obstruction and lymphoid hyperplasia in the appendix lumen of 5 *** mortality was ***:The ratio of acute appendicitis caused by plants is minimal among all appendectomised patients, but avoidence of eating undigested fruit seeds and chewing plants well may help to prevent appendicitis.

关键词： Staphylococcus aureus Lymphocyte Nanoconjugated vancomycin Antioxidant enzymes TNF-α IL-10 Infection Anti-inflammatory Antioxidative effect Bacteremia Oxidative stress Nitric oxide Inflammatory parameter Pathogenesis

Performance improvement of air-breathing proton exchange membrane fuel cell(PEMFC) with a condensing-tower-like curved flow field

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Chinese Chemical Letters 2023年第4期34卷 507-512页

作者： Hanqing Jin Siyi Zou Qinglin Wen Yali Li Fandi Ning Pengpeng Xu Saifei Pan Xiaochun Zhou Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China Division of Advanced nanomaterials Suzhou Institute of Nano-tech and Nano-bionicsChinese Academy of Sciences(CAS)Suzhou 215123China School of Nano Technology and Nano Bionics University of Science and Technology of ChinaHefei 230026China College of sciences Shanghai UniversityShanghai 200444China Key Lab of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences(CAS)Suzhou 215123China

Air-breathing proton exchange membrane fuel cells(PEMFCs) are very promising portable energy with many advantages. However, its power density is low and many additional supporting parts affect its specific power. In this paper, we aim to improve the air diffusion and fuel cell performance by employing a novel condensing-tower-like curved flow field rather than an additional fan, making the fuel cell more compact and has less internal power consumption. Polarization curve test and galvanostatic discharge test are carried out and proved that curved flow field can strengthen the air diffusion into the PEMFC and improve its performance. With appropriate curved flow field, the fuel cell peak power can be 55.2%higher than that of planar flow field in our study. A four-layer stack with curved cathode flow field is fabricated and has a peak power of 2.35 W(120 W/kg).

关键词： Curved flow field 3D print Air-breathing PEMFC Air convection Condensing tower