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Chinese Physics B 2019年第4期28卷 29-35页

作者： Wen Luo Li-Zhi Yan Rong Liu Tao-Yu Zou Hang Zhou school of Electronic and Computer Engineering Peking University Shenzhen Graduate School

Perovskite photoconductor-type photodetector with metal–semiconductor–metal(MSM) structure is a basic device for photodetection applications. However, the role of electrode interlayer in MSM-type perovskite devices is less investigated compared to that of the pin diode structure. Here, a systematic investigation on the influence of phenyl-C_(61)-butyric acid methyl ester(PCBM) and indene-C_(60) bisadduct(ICBA) interfacial layers for MSM perovskite photodetectors is *** is found that the fullerene-based interlayer significantly enhances the photocurrent of the MSM photodetectors. On one hand, the PCBM interlayer is more suitable for CH_3 NH_3 PbI_3 photodetector, with the responsivity two times higher than that of the device with ICBA interlayer. The ICBA layer, on the other hand, becomes more effective when the band gap of perovskite is enlarged with bromine composition, denoted as CH_3 NH_3 Pb(I_(1-x)Br_x)_3(0 ≤ x ≤1). It is further found that the specific detectivity of photodetectors with ICBA interlayer becomes even higher than those with PCBM when the bromine compositional percentage reaches 0.6(x > 0.6).

关键词： interlayer perovskite photodetectors

Wetting characteristics of the hydrophobic material surface through condensation

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high Voltage 2023年第1期8卷 31-37页

作者： Xiaohan Wu Bin Cao Liming Wang Chuyan Zhang Department of Tsinghua-Berkeley shenzhen Institute(TBSI) Tsinghua UniversityShenzhenChina Tsinghua shenzhen International Graduate school Tsinghua UniversityShenzhenChina school of Information Engineering China University of Geosciences(Beijing)BeijingChina

Composite insulators are generally considered to have excellent anti-pollution flashover performance,but recently there has been a flashover accident on the indoor clean insulator in China,which is suspected to be related to the wetting of insulators through ***,this paper studied the water condensation on hydrophobic *** changes in the mass,length,and proportion of the water droplets on the hydrophobic surface during the wetting process were measured,and the influence of wetting degree on the flashover characteristics was *** was found that the insulator surface temperature lower than the dew point is a prerequisite for the wetting of the clean hydrophobic surface,and the wetting velocity increases with the electric *** results could provide some reference for understanding the insulator flashover accidents.

关键词： surface characteristics flash

A large-scale cold plasma jet: generation mechanism and application effect

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Plasma Science and Technology 2024年第4期26卷 1-8页

作者：崔伟胜张若兵 shenzhen International Graduate school Tsinghua UniversityShenzhen 518055People’s Republic of China

Atmospheric pressure cold plasma jets(APCPJs) typically exhibit a slender, conical structure,which imposes limitations on their application for surface modification due to the restricted treatment area. In this paper, we introduce a novel plasma jet morphology known as the large-scale cold plasma jet(LSCPJ), characterized by the presence of both a central conical plasma jet and a peripheral trumpet-like diffuse plasma jet. The experimental investigations have identified the factors influencing the conical and the trumpet-like diffuse plasma jet, and theoretical simulations have shed light on the role of the flow field and the electric field in shaping the formation of the LSCPJ. It is proved that, under conditions of elevated helium concentration, the distributions of impurity gas particles and the electric field jointly determine the plasma jet’s morphology. high-speed ICCD camera images confirm the dynamic behavior of plasma bullets in LSCPJ, which is consistent with the theoretical analysis. Finally, it is demonstrated that when applied to the surface treatment of silicone rubber, LSCPJ can achieve a treatment area over 28 times larger than that of APCPJ under equivalent conditions. This paper uncovers the crucial role of impurity gases and electric fields in shaping plasma jet morphology and opens up the possibility of efficiently diversifying plasma jet generation effects through external electromagnetic fields. These insights hold the promise of reducing the generation cost of plasma jets and expanding their applications across various industrial sectors.

关键词： diffuse plasma jet flow field electric field surface treatment

Engineering nanoporous and solid core-shell architectures of lowplatinum alloy catalysts for high power density PEM fuel cells

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Nano Research 2022年第7期15卷 6148-6155页

作者： Yongqiang Kang Jiaqi Wang Yinping Wei Yongle Wu Dongsheng Xia Lin Gan Institute of Materials Research Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

Low-platinum(Pt)alloy catalysts hold promising application in oxygen reduction reaction(ORR)electrocatalysis of protonexchange-membrane fuel cells(PEMFCs).Although significant progress has been made to boost the kinetic ORR mass activity at low current densities in liquid half-cells,little attention was paid to the performance of Pt-based catalysts in realistic PEMFCs particularly at high current densities for high power density,which remains poorly *** this paper,we show that,regardless of the kinetic mass activity at the low current density region,the high current density performance of the low-Pt alloy catalysts is dominantly controlled by the total Pt surface area,particularly in low-Pt-loading H_(2)–air *** this end,we propose two different strategies to boost the specific Pt surface area,the post-15-nm dealloyed nanoporous architecture and the sub-5-nm solid core–shell nanoparticles(NPs)through fluidic-bed synthesis,both of which bring in comparably high mass activity and high Pt surface area for large-current-density *** medium current density,the dealloyed porous NPs provide substantially higher H_(2)–air PEMFC performance compared to solid core–shell catalysts,despite their similar mass activity in liquid *** transmission electron microscopy images combined with electron energy loss spectroscopic imaging evidence a previously unreported“semi-immersed nanoporous-Pt/ionomer”structure in contrast to a“fully-immersed core–shellPt/ionomer”structure,thus favoring O_(2) transport and improving the fuel cell *** results provide new insights into the role of Pt nanostructures in concurrently optimizing the mass activity,Pt surface area and Pt/Nafion interface for high power density fuel cells.

关键词： low-platinum alloy catalyst nanoporosity proton-exchange-membrane fuel cells power density triple-phase boundary

A novel two-dimensional nanoheterojunction via facilitating electron–hole pairs separation for synergistic tumor phototherapy and immunotherapy

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Nano Research 2023年第5期16卷 7148-7163页

作者： Xiaoge Zhang Xiaomei Chen Peng Zhang Meiting Li Miao Feng Yaqian Zhang Lili Cheng Junjie Tang Langtao Xu Yadong Liu Zhuoyin Liu Zhong Cao Jie Liu school of Biomedical Engineering Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China

Nanomaterial-mediated phototherapy in tumor treatment has been developed rapidly in the past few years due to its noninvasive ***,the low energy conversion efficiency and high recombination rate of the photo-triggered electron–hole pairs of single nano-agent limit the phototherapy ***,we constructed a novel two-dimensional nanoheterojunction MoS_(2)-Ti_(3)C_(2)(MT),which allowed a high photothermal conversion efficiency(59.1%)as well as an effective separation of photo-triggered electron–hole pairs for reactive oxygen species(ROS)generation under single 808 nm laser *** the modification of the mitochondrial targeted molecule(3-proxycarboxylic)triphenyl phosphine bromide(TPP)and 4T1 cell membrane,m@MoS_(2)-Ti_(3)C_(2)/TPP(m@MTT)could effectively target to the tumor cell and further locate to the mitochondria to amplify tumor-specific oxidative stress,which not merely effectively inhibits the local tumor growth but also induces tumor immunogenic cell death(ICD)for activating antitumor immune ***,cytosine guanine dinucleotide(CPG),as a Toll-like receptor 9(TLR9)agonist,was further introduced to the system to boost adaptive immune responses,resulting in improved level of cytotoxic T cells as well as a decrease in the number of regulatory T *** vivo antitumor mechanism studies demonstrated that not only the primary and distant tumors in 4T1 bearing-tumor mice model were significantly inhibited,but also the lung metastasis of tumor was effectively ***,this work revealed the ROS generation mechanism of MT nanoheterojunction and provided a novel strategy to fabricate a biomedically applicable MT nanoheterojunction for tumor treatment.

关键词： two-dimensional nanoheterojunction mitochondrial targeting photothermal therapy photodynamic therapy immunotherapy

Geometry of Rectangular Block Triangular Matrices

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Acta Mathematica Sinica,English Series 2009年第12期25卷 2035-2054页

作者： Li Ping HUANG Su Wen ZOU school of Mathematics and Computing Science Changsha University of Science and Technology Changsha 410076 P. R. China Liuzhou senior high school Liuzhou 545006 P. R. China

Let D be any division ring, and let T（mi,ni,k） be the set of k × k （k ≥ 2） rectangular block triangular matrices over D. For A, B ∈ T（mi,ni,k）, if rank（A - B） = 1, then A and B are said to be adjacent and denoted by A -B. A map T ： T（mi,ni,k） -〉 T（mi,ni,k） is said to be an adjacency preserving map in both directions if A - B if and only if φ（A） φ（B）. Let G be the transformation group of all adjacency preserving bijections in both directions on T（mi,ni,k）. When m1,nk ≥ 2, we characterize the algebraic structure of G, and obtain the fundamental theorem of rectangular block triangular matrices over D.

关键词： geometry of matrices triangular matrix adjacency preserving maximal set

Experimental study of a neutralizer-free gridded ion thruster using radio-frequency self-bias effect

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Plasma Science and Technology 2023年第4期25卷 164-174页

作者：杨智郭宏辉白进纬李阳曹勇朱雨 school of Mechanical Engineering and Automation Harbin Institute of Technology(Shenzhen)Shenzhen 518055Peopleʼs Republic of China school of Science Harbin Institute of Technology(Shenzhen)Shenzhen 518055Peopleʼs Republic of China shenzhen Ruoyu Technology Co.Ltd Shenzhen 518116Peopleʼs Republic of China

An experimental study on the quasi-neutral beam extracted by a neutralizer-free gridded ion thruster prototype was *** prototype was designed using an inductively coupled plasma source terminated by a double-grid *** beam characteristics were compared when the accelerator was radio-frequency(RF)biased and direct-current(DC)*** RF power supply was applied to the screen grid via a blocking capacitor for the RF acceleration,and a DC power supply was directly connected to the screen grid for the DC *** was used as the propellant ***,the characteristics of the plasma beam,such as the floating potential,the spatial distribution of ion flux,and the ion energy distribution function(IEDF)were measured by a four-grid retarding field energy *** floating potential results showed that the beam space charge is compensated in the case of RF acceleration without a neutralizer,which is similar to the case of classical DC acceleration with a *** ion flux of RF acceleration is 1.17 times higher than that of DC acceleration under the same DC component voltage between the ***,there are significant differences in the beam IEDFs for RF and DC *** IEDF of RF acceleration has a widened and multipeaked profile,and the main peak moves toward the high-energy region with increasing the DC self-bias *** addition,by comparing the IEDFs with RF acceleration frequencies of3.9 and 7.8 MHz,it is found that the IEDF has a more centered main peak and a narrower energy spread at a higher frequency.

关键词： gridded ion thruster neutralizer-free RF acceleration plasma beam

AdaptNF: Adaptive service chain scheduling with stateless migration and NF consolidation

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Digital Communications and Networks 2023年第2期9卷 462-472页

作者： Qing Li He Huang Yong Jiang Jingpu Duan Peng Cheng Laboratory Shenzhen518000China Tsinghua shenzhen International Graduate school Shenzhen10003China Southern University of Science and Technology Shenzhen14325China

The combination of network function virtualization and software-defined networking allows various network functions to process flows according to their characteristics and *** to the highly dynamic nature of the workload,the network infrastructure needs to properly schedule the underlying resources in order to respond to workload changes in a timely ***,the existing NFV platform lacks a comprehensive solution for how to scale under workload variation,which may seriously hurt the overall system *** improve the scalability of the NFV platform and ensure consistent high performance under dynamic workloads,we propose AdaptNF,a novel NFV platform designed to support a combination of course-grained and fine-grained resource scheduling *** deal with resource imbalance,which is the essential scheduling problem that leads to insufficient NFV performance,AdaptNF adopts a novel algorithm that can efficiently balance the workload among multiple network function instances through stateless flow *** controlled experiments show that the AdaptNF scheme can optimize resource allocation and ensure outstanding performance after *** terms of network throughput and latency,AdaptNF significantly improves the performance of the underlying NFV platform.

关键词： Network function virtualization Software-defined networking Service chain Flow migration Dynamic scale

Unraveling the role of NiSnPH@OOH/CC perovskite hydroxide for efficient electrocatalytic oxidation of methanol to formate

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Nano Research 2024年第4期17卷 2388-2399页

作者： Jing Shao Yusheng Fang Xiaobing Wu Muhammad Imran Abdullah Youkun Tao College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China school of Science Harbin Institute of TechnologyShenzhen 518055China

The sluggish kinetics of oxygen evolution reaction(OER)is the key tailback for hydrogen production from the water *** OER with thermodynamically auspicious methanol oxidation reaction(MOR)can significantly boost the H_(2) and value-added products ***,it is currently challenging to achieve a synergistic manipulation of product selectivity and performance for MOR ***,we report NiSnPH@OOH/CC(CC=carbon cloth)perovskite hydroxide nanosphere as an efficient MOR electrocatalyst with high activity,stability,and selectivity towards methanol oxidation to formate.A surface amorphous layer of defect rich NiOOH was generated in operando by selective Sn leaching with stable perovskite hydroxide bulk structure,which mitigates the oxidative power and optimizes the local coordination environment of the active NiOOH *** situ Raman combined with electrochemical studies further confirm the key active species,NiOOH,generated in operando enhance the MOR and blocking the over oxidation of methanol to CO_(2).As a result,NiSnPH@OOH/CC effectively masks the OER and attains>99%selectivity with 100%Faradic efficiency for *** results of this study show the advances of NiSnPH@OOH/CC as an efficient electrocatalyst for MOR and also suggest its potential applications for various small organic molecules oxidation.

关键词： perovskite hydroxide small organic molecules nickel oxy(hydroxide) value-added products methanol oxidation reaction

Practical evaluation of prelithiation strategies for next-generation lithium-ion batteries

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Carbon Energy 2023年第8期5卷 55-77页

作者： Shiming Chen Zhen Wang Meng Zhang Xiaoze Shi Lu Wang Weifeng An Zikun Li Feng Pan Luyi Yang school of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhenChina BTR New Material Group Co. Ltd.ShenzhenChina R&D Institute Shenzhen BAK Power Battery Co.Ltd.ShenzhenChina

With the increasing market demand for high-performance lithium-ion batteries with high-capacity electrode materials,reducing the irreversible capacity loss in the initial cycle and compensating for the active lithium loss during the cycling process are critical *** recent years,various prelithiation strategies have been developed to overcome these *** these approaches are carried out under a wide range of conditions,it is essential to evaluate their suitability for large-scale commercial *** this review,these strategies are categorized based on different battery assembling stages that they are implemented in,including active material synthesis,the slurry mixing process,electrode pretreatment,and battery ***,their advantages and disadvantages in commercial production are discussed from the perspective of thermodynamics and *** review aims to provide guidance for the future development of prelithiation strategies toward commercialization,which will potentially promote the practical application of next-generation high-energy-density lithium-ion batteries.

关键词： high-energy-density irreversible capacity loss lithium-ion batteries practical application prelithiation