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Excellent Terahertz shielding performance of ultrathin flexible Cu/graphene nanolayered composites with high stability

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Journal of Materials Science & Technology 2020年第17期52卷 136-144页

作者： Shengyue Hou Wenle Ma Guanghao Li Yi Zhang Yunyun Ji Fei Fan Yi Huang National Institute for Advanced Materials Tianjin Key Laboratory of Metal and Molecule Based Material ChemistryKey Laboratory of Functional Polymer MaterialsCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)School of Materials Science and EngineeringNankai UniversityTianjin 300350China Beijing Institute of Aeronautical Materials Beijing 100095China Institute of Modern Optics Nankai UniversityTianjin 300350China

Electromagnetic interference(EMI)shielding at Terahertz(THz)frequency range attracts increasing attention due to the rapid development of THz science and *** shielding materials with small thickness,high shielding effectiveness(SE),good flexibility and stability are highly ***,an ultrathin flexible copper/graphene(Cu/Gr)nanolayered composite are prepared,which can reach the average EMI SE of 60.95 dB at 0.1–1.0 THz with a thickness of only 160 nm,indicating that more than 99.9999%of the THz wave power can be ***,the Cu/Gr nanolayered composite also exhibits excellent oxidation resistance,with a 93.09%maintenance rate for EMI SE value after heating at 120℃for 3 h in air,far higher than that of the bare Cu film(62.15%).Besides,the Cu/Gr nanolayered composite exhibits good mechanical flexibility and flexural fatigue *** EMI SE value of the Cu/Gr nanolayered composite shows a maintenance rate of 98.87%even after 1500 times bending cycles,obviously higher than that of multilayer Cu film(93.07%).These results demonstrate that the ultrathin flexible Cu/Gr nanolayered composites with excellent shielding performance and good stability have a broad application prospect in THz shielding for wearable devices and next generation mobile communication equipment.

关键词： Terahertz shielding Ultrathin flexible Cu/grapheme nano composites high stability

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In-situ growth of polypyrrole on aramid nanofibers for electromagnetic interference shielding films with high stability

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Nano Research 2022年第9期15卷 8536-8545页

作者： Jianyu Zhou Sineenat Thaiboonrod Jianhui Fang Shaomei Cao Miao Miao Xin Feng Research Center of Nano Science and Technology College of SciencesShanghai UniversityShanghai 200444China National Nanotechnology Center(NANOTEC) National Science and Technology Development Agency(NSTDA)Thailand Science ParkPathum Thani 12120Thailand

Flexible electromagnetic interference(EMI)shielding films with high stability have shown promising prospect in harsh working conditions such as military,communication,and special protection ***,flexible aramid nanofibers@polypyrrole(ANF@PPy)films with high stability were easily achieved by the in-situ growth of PPy on the surface of ANF and the subsequent pressured-filtration film-forming *** the amount of pyrrole(Py)monomer is 40μL,the ANF@PPy(AP40)film exhibited excellent EMI shielding performance with shielding effectiveness(SE)of 41.69 dB,tensile strength of 96.01 MPa,and fracture strain of 21.95%at the thickness of 75.76μ***,the anticipated EMI shielding performance can be maintained even after being heated at 200℃in air,soaked in 3.5%NaCl solution,repeated folding for one million times,or burned directly,indicating superior environmental durability in harsh ***,it is believed that the ANF@PPy films with high stability offer a facile solution for practical protection for high-performance EMI shielding applications.

关键词： in-situ growth of polypyrrole(PPy)on aramid nanofibers(ANF) electromagnetic interference(EMI)shielding films high stability water-resistance thermal mechanical properties

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Novel photoelectric material of perovskite-like(CH_(3))_(3)SPbI_(3) nanorod arrays with high stability

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Journal of Energy Chemistry 2021年第8期30卷 581-588,I0012页

作者： Ruiyuan Hu Chuangye Ge Liang Chu Yifei Feng Shanshan Xiao Yuhui Ma Wei Liu Xing'ao Li Mohammad Khaja Nazeeruddin Institute of Advanced Materials&New Energy Technology Engineering Laboratory of Jiangsu Province&School of Materials Science and Engineering&School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Hoffmann Institute of Advanced Materials Shenzhen PolytechnicShenzhen 518055China Group for Molecular Engineering of Functional Materials EPFL Valais WallisCH-1951 SionSwitzerland

Organometallic halide perovskite materials make great achievements in optoelectronic fields,especially in solar cells,in which the organic cations contain amine ***,the amine with NàH bonds is easily hydrolyzed with moisture in the air,weakening the perovskite materials *** is desirable to develop other non-amine stable perovskite *** this work,sulfur-based perovskite-like(CH_(3))_(3)SPbI_(3) nanorod arrays were fabricated by a solution-processed method,which can be indexed hexagonal crystal structure in the space group P63 *** binding force is exceptionally strong between the non-amine(CH_(3))_(3) S+and[PbI_(6)]_(4)-octahedral,leading to high stability of(CH_(3))_(3)SPbI_(3).The(CH_(3))_(3)SPbI_(3) nanorod arrays can keep the morphology and crystal structure in an ambient atmosphere over 60 *** addition,the(CH_(3))_(3)SPbI_(3) nanorod arrays can offer direct charge transfer channels,which show excellent optoelectronic ***(CH_(3))_(3)SPbI_(3) nanorod arrays-based solar cells with VOx hole transfer layers achieved a power conversion efficiency of 2.07%with negligible *** the(CH_(3))_(3)SPbI_(3) nanorod arrays were also effectively applied in photodetectors with interdigitated gold *** work demonstrates that sulfur-based perovskite-like(CH_(3))_(3)SPbI_(3) is a novel promising stable compound with great potential for practical optoelectronic applications.

关键词： Perovskite solar cells high stability (CH_(3))_(3)SPbI_(3) nanorod arrays Photodetectors

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1-Methyl-3-octylimidazolium Polyoxomolybdate Ionic Liquid with Low Melting Point and high stability:Preparation and Photocatalytic Activity

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Chemical Research in Chinese Universities 2011年第2期27卷 177-180页

作者： DONG Tao XU Yan-qing CHEN Fa-wang CHI Ying-nan HU Chang-wen State Key Laboratory of Explosion Science and Technology Department of ChemistryInstitute for Chemical Physics Beo＇ing Institute of Technology Beijing 100081 P R. China

The polyoxometalate（POM）-imidazole ionic liquid（IL） [C8mim]2[Mo6O19]（C8mim=1-methyl-3-octylimi- dazolium） with a low melting point of 82.6 °C was successfully prepared and characterized by FTIR, XPS, NMR, TG and so on. The polyoxomolybdate-based IL has high stability, and its decomposing temperature reaches 321 °C, which is higher than that of 1-alkyl-3-methylimidazolium halides IL. Further photocatalytic performances of the IL were measured via degrading dye rhodamine B（RB） in aqueous solution under the UV light irradiation. The experiments show that the conversion of RB reaches 80.5% after 90 min under UV-light and the degradation efficiency depends on the pH value of the solution, irradiation time and the dosage of the IL and so on.

关键词： Ionic liquid Polyoxomolybdate Low melting point high stability Photocatalytic activity

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Two lanthanide(Ⅲ)-copper(Ⅱ) chains based on[Cu_2Ln_2]clusters exhibiting high stability,magnetocaloric effect and slow magnetic relaxation

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Chinese Chemical Letters 2014年第6期25卷 829-834页

作者： Xiao-Hong Miao Song-De Han Sui-Jun Liu Xian-He Bu Department of Chemistry and TKL of Metal-and Molecule-Based Material Chemistry and Collaborative Innovation Center of Chemical Science and Engineering(Tianjin).Nankai University

Two 3d-4f heterometallic one-dimensional chains with neutral 4,4＇-bipyridine ligands as linkers and[Cu2Ln2] clusters （Ln = Gd for 1, Dy for 2） as nodes have been hydrothermally synthesized and structurally characterized. Magnetic studies indicate that complex 1 exhibits a relatively large magnetocaloric effect, with an entropy change -△Smax m= 24.8 J kg 1 K^-1, whilst, complex 2 features slow magnetic relaxation at low temperature.

关键词： 3d-4f high stability Magnetocaloric effect Slow magnetic relaxation

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A high stability high voltage power supply design for HEPS injection system

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Radiation Detection Technology and Methods 2021年第4期5卷 564-569页

作者： Peng Liu Jinhui Chen Guanwen Wang Institute of high Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose The high energy photon source(HEPS)uses the on-axial injection *** are two designs in this injection scheme that are critical to the performance of the HEPS injection *** is the strip line kicker and another is the high voltage fast pulse power supply *** the high voltage fast pulse power supply system,the design of high voltage power supply is very *** output voltage stability of high voltage power supply directly affects the stability of the pulse amplitude of the injection *** A high voltage power supply with high output voltage stability is designed in this paper,and the scheme is *** correctness of the design scheme is verified by simulation *** A prototype is built for full *** test results showed that the output voltage stability is lower than 58 *** output voltage is 6.4 mV(f≤3 kHz)/113.2 mV(f>3 kHz).Conclusions The designed high voltage power supply can fully meet the requirements of the HEPS injection system.

关键词： HEPS Injection system high stability Voltage ripple high voltage power supply

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Application Layer Multicast Model with Low Delay and high stability

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Journal of Donghua University(English Edition) 2023年第1期40卷 74-79页

作者：廖小飞宣益亮宿轩策李德敏 College of Information Sciences and Technology Donghua UniversityShanghai 201620China Engineering Research Center of Digitized Textile&Fashion Technology Ministry of EducationDonghua UniversityShanghai 201620China

As an alternative of Internet protocol(IP)multicast,application layer multicast(ALM)is widely used with the advantage of simplicity and ***,the existing problems of large transmission delay and poor stability limit the application and *** this article,to solve these problems,an ALM model based on node potential(NP)and topological index(TI)is *** proposed model considers the factors of node capability and node distance in constructing and maintaining multicast tree to reduce transmission delay and increase stability,and thus it improves the application level in real-time multimedia *** computer simulations prove that the proposed model reduces the ALM transmission delay,increases multicast tree stability effectively,and improves the ALM performance,and therefore it is suitable to apply in large-scale real-time multimedia environment.

关键词： application layer multicast(ALM) high stability low delay node potential(NP) topological index(TI)

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A high-power high-stability Q-switched green laser with intracavity frequency doubling using a diode-pumped composite ceramic Nd:YAG laser

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Chinese Physics B 2012年第9期21卷 315-320页

作者：王与烨徐德刚刘长明王卫鹏姚建铨 Institute of Laser and Optoelectronics College of Precision Instrument and Optoelectronics EngineeringTianjin University Key Laboratory of Optoelectronics Information Science and Technology Tianjin UniversityMinistry of Education

We successfully obtain a high-average-power high-stability Q-switched green laser based on diode-side-pumped composite ceramic Nd：YAG in a straight piano-concave cavity. The temperature distribution in composite ceramic Nd：YAG crystal is numerically analyzed and compared with that of conventional Nd：YAG crystal. By using a composite ceramic Nd：YAG rod and a type-II high gray track resistance KTP （HGTR-KTP） crystal, a green laser with an average output power of 165 W is obtained at a repetition rate of 25 kHz, with a diode-to-green optical conversion of 14.68%, and a pulse width of 162 ns. To the best of our knowledge, both the output power and optical-to-optical efficiency are the highest values for green laser systems with intracavity frequency doubling of this novel composite ceramic Nd：YAG laser to date. The power fluctuation at around 160 W is lower than 0.3% in 2.5 hours.

关键词： high-average-power green laser high stability composite ceramic Nd:YAG rod

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high-stability spherical lanthanide nanoclusters for magnetic resonance imaging

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National Science Review 2023年第4期10卷 123-132页

作者： Hai-Ling Wang Donglin Liu Jian-Hua Jia Jun-Liang Liu Ze-Yu Ruan Wei Deng Shiping Yang Si-Guo Wu Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of Chemistry Sun Yat-sen University College of Chemistry and Materials Science Shanghai Normal University

high-nuclear lanthanide clusters have shown great potential for the administration of high-dose mononuclear gadolinium chelates in magnetic resonance imaging(MRI). The development of high-nuclear lanthanide clusters with excellent solubility and high stability in water or solution has been challenging and is very important for expanding the performance of MRI. We used N-methylbenzimidazole-2-methanol(HL) and LnCl3·6H2O to synthesize two spherical lanthanide clusters, Ln32(Ln = Ho, Ho32; and Ln =Gd, Gd32), which are highly stable in solution. The 24 ligands L-are all distributed on the periphery of Ln32and tightly wrap the cluster core, ensuring that the cluster is stable. Notably, Ho32can remain highly stable when bombarded with different ion source energies in HRESI-MS or immersed in an aqueous solution of different pH values for 24 h. The possible formation mechanism of Ho32was proposed to be Ho(Ⅲ),(L)-and H2O → Ho3(L)3/Ho3(L)4→ Ho4(L)4/Ho4(L)5→ Ho6(L)6/Ho6(L)7→ Ho16(L)19→Ho28(L)15→ Ho32(L)24/Ho32(L)21/Ho32(L)23. To the best of our knowledge, this is the first study of the assembly mechanism of spherical high-nuclear lanthanide clusters. Spherical cluster Gd32, a form of highly aggregated Gd(Ⅲ), exhibits a high longitudinal relaxation rate(1 T, r1= 265.87 mM-1·s-1). More notably, compared with the clinically used commercial material Gd-DTPA, Gd32has a clearer and higher-contrast T1-weighted MRI effect in mice bearing 4T1 tumors. This is the first time that high-nuclear lanthanide clusters with high water stability have been utilized for MRI. high-nuclear Gd clusters containing highly aggregated Gd(Ⅲ) at the molecular level have higher imaging contrast than traditional Gd chelates; thus, using large doses of traditional gadolinium contrast agents can be avoided.

关键词： T1-weighted MRI lanthanide clusters high stability low toxicity assembly mechanism

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Versatility of Carbon Enables All Carbon Based Perovskite Solar Cells to Achieve high Efficiency and high stability

Versatility of Carbon Enables All Carbon Based Perovskite So...

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第五届新型太阳能电池学术研讨会

作者： Junshuai Zhou Xiangyue Meng Jie Hou Yingchu Chen Xia Tao State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology

Carbon-based perovskite solar cells(PVSCs) without hole transport materials are promising for their high stability and low cost, but the electron transporting layer(ETL) of TiO is notorious for inflicting hysteresis and instability. In view of its electron accepting ability, C is used to replace TiO for the ETL, forming a so-called all carbon based PVSC. With a device structure of fluorine-doped tin oxide(FTO)/C/methylammonium lead iodide(MAPbI)/carbon, a power conversion efficiency(PCE) is attained up to 15.38% without hysteresis, much higher than that of the TiO ones(12.06% with obvious hysteresis). The C ETL is found to effectively improve electron extraction, suppress charge recombination, and reduce the sub-bandgap states at the interface with MAPbI. Moreover, the all carbon based PVSCs are shown to resist moisture and ion migration, leading to a much higher operational stability under ambient, humid, and light-soaking conditions. To make it an even more genuine all carbon based PVSC, it is further attempted to use graphene as the transparent conductive electrode, reaping a PCE of 13.93%. The high performance of all carbon based PVSCs stems from the bonding flexibility and electronic versatility of carbon, promising commercial developments on account of their favorable balance of cost, efficiency, and stability.

关键词： perovskite solar cells carbon fullerene high stability

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