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Constructing bimodal nanoprobe based on Gd:AgInS_(2)/ZnS quantum dots for fluorometric/magnetic resonance imaging in mesenchymal stem cells

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Journal of Materials Science & Technology 2023年第17期148卷 116-122页

作者： Dan Yang Xian Wei Zhiyan Piao Zhongjie Cui Haiyang He Zhuoqi Wen Wanlu Zhang Le Wang Shiliang Mei Ruiqian Guo institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China College of Electronic and Optical Engineering&College of Flexible electronics Nanjing University of Posts and TelecommunicationsNanjing 210023China Academy for Engineering and Technology Fudan UniversityShanghai 200433China Zhongshan-Fudan Joint Innovation Center Zhongshan 528437China Yiwu Research institute of Fudan University Yiwu 322000China

Mesenchymal stem cells(MSCs)hold great promise in regenerative medicine and received overwhelm-ing concerns to promote their therapeutic *** to the shortage of MSCs-specific biomarkers,bimodal imaging nanoprobes with integrated complementary information are of great importance in ameliorating the efficacy of MSCs terminal *** this study,a noninvasive dual-mode imaging nanoprobe with enhanced detection sensitivity and spatial resolution based on alloyed Gd:AgInS_(2)/ZnS quantum dots(QDs)was first fabricated through a microwave-assisted heating *** QDs with red emissive fluorescence exhibit excellent biocompatibility in MSCs under a confocal *** for magnetic resonance imaging(MRI),the longitudinal relaxation rate of 11.1420 mM^(-1) S^(-1) of Gd:AgInS_(2)/ZnS QDs was achieved,which was 1.7 times higher than that of commercial MRI contrast agent(6.4667 mM^(-1) S^(-1)).Furthermore,the cellular internalization of Gd:AgInS_(2)/ZnS QDs exerts no significant effect on the adipogenesis of MSCs and is conducive to the observation of further adipogenic *** work helps to verify the promising prospect to develop a bimodal nanoprobe of fluorescence/MRI based on Gd:AgInS_(2)/ZnS QDs,which could monitor the differentiation and migration of MSCs for further therapeu-tic approach.

关键词： AgInS_(2)quantum dots Gd doping Dual-mode imaging Mesenchymal stem cells Differentiation

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Performance enhancement of paper-based SERS chips by shell-isolated nanoparticle-enhanced Raman spectroscopy

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Journal of Materials Science & Technology 2019年第10期35卷 2207-2212页

作者： Mingze Sun Binghan Li Xiaojia Liu Jiayin Chen Taotao Mu Lianqing Zhu Jinhong Guo Xing Ma State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology(Shenzhen)Shenzhen518055China Flexible Printed electronics Technology Center Harbin Institute of Technology(Shenzhen)Shenzhen518055China Beijing Engineering Research Center of Optoelectronic Information and Instruments Beijing Information Science and Technology UniversityBeijing100016China School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu671731China

Paper-based flexible surface-enhanced Raman scattering(SERS) chips have been demonstrated to have great potential for future practical applications in point-of-care testing(POCT) due to the potentials of massive fabrication, low cost, efficient sample collection and short signal acquisition time. In this work,common filter paper and Ag@Si O2 core-shell nanoparticles(NP) have been utilized to fabricate SERS chips based on shell-isolated nanoparticle-enhanced Raman spectroscopy(SHINERS). The SERS performance of the chips for POCT applications was systematically investigated. We used crystal violet as the model molecule to study the influence of the size of the Ag core and the thickness of the Si O2 coating layer on the SERS activity and then the morphology optimized Ag@Si O2 core-shell NPs was employed to detect thiram. By utilizing the smartphone as a miniaturized Raman spectral analyzer, high SERS sensitivity of thiram with a detection limit of 10^-9 M was obtained. The study on the stability of the SERS chips shows that a Si O2 shell of 3 nm can effectively protect the as-prepared SERS chips against oxidation in ambient atmosphere without seriously weakening the SERS sensitivity. Our results indicated that the SERS chips by SHINERS had great potential of practical application, such as pesticide residues detection in POCT.

关键词： SERS chip Point-of-Care test(POCT) Shell-core nanostructure Stability

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Novel calibration optical path of cryogenic radiometer

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Chinese Optics Letters 2015年第5期13卷 35-39页

作者：庞伟伟郑小兵李健军史学舜吴浩宇夏茂鹏高冬阳史剑民戚涛康晴 Key Laboratory of Optical Calibration and Characterization Chinese Academy of Sciences The 41st institute of China electronics Technology Group Corporation

We introduce a novel calibration optical path of the cryogenic radiometer, which can avoid the repeated dis- mounting measurement and eliminate the negative influence of Brewster window effect on calibration result. The novel calibration optical path is used to calibrate the absolute spectral responsivity of the standard transfer detector at 633 nm, the results of which are compared with the ones of the previous structure. It is shown that comparing the previous results to the structure optimization, the measurement uncertainty of laser power reduces by a factor of 2, the measurement uncertainty on the absolute spectral responsivity of the transfer detector decreases by 15%, and the consistence of the calibration on absolute spectral responsivity is 4.0 × 10^-3. The experiment result proves that the novel calibration optical path of cryogenic radiometer can effectively reduce the calibration uncertainty against standard detector and improve the accuracy of calibration.

关键词： Cryogenic equipment Cryogenics Radiometers Structural optimization Uncertainty analysis

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EFFECTS OF H2 AND O2 PLASMA ON POLYSILICON THIN FILM TRANSISTOR(TFT)

EFFECTS OF H2 AND O2 PLASMA ON POLYSILICON THIN FILM TRANSIS...

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The Third International Conference on Solid State and Integrated Circuit Technology

作者： Chung Len Lee Department of electronics Engineering and institute of electronics National Chiao Tung University Hsinchu Taiwan China

The effects of H and O plasma on polysilicon are *** is found that the O2-plasma-treated TFT devices show the same improvement on Vth and S as do the H2-plasma-treated TFT devices and the O2-plasma-treated devices hav...

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Electronic structure regulation of noble metal-free materials toward alkaline oxygen electrocatalysis

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eScience 2023年第4期3卷 20-38页

作者： Xia Wang Minghao Yu Xinliang Feng Max-Planck-institute for Chemical Physics of Solids 01187 DresdenGermany Centre for Advancing electronics Dresden(CFAED)&Faculty of Chemistry and Food Chemistry Technische Universit€at Dresden01062 DresdenGermany Max Planck institute of Microstructure Physics 06120 HalleGermany

Developing highly efficient,inexpensive catalysts for oxygen electrocatalysis in alkaline electrolytes(i.e.,the oxygen reduction reaction(ORR)and the oxygen evolution reaction(OER))is essential for constructing advanced energy conversion techniques(such as electrolyzers,fuel cells,and metal–air batteries).Recent achievements in efficient noble metal-free ORR and OER catalysts make the replacement of conventional noble metal counterparts a realistic *** particular,various electronic structure regulation strategies have been employed to endow these oxygen catalysts with attractive physicochemical properties and strong synergistic effects,providing significant fundamental understanding to advance in this *** review article summarizes recently developed electronic structure regulation strategies for three types of noble metal-free oxygen catalysts:transition metal compounds,single-atom catalysts,and metal-free *** begin by briefly presenting the basic ORR and OER reaction mechanisms,following this with an analysis of the fundamental relationship between electronic structure and intrinsic electrocatalytic activity for the three categories of ***,recent advances in electronic structure regulation strategies for noble metal-free ORR and OER catalysts are systematically *** conclude by summarizing the remaining challenges and presenting our outlook on the future for designing and synthesizing noble metal-free oxygen electrocatalysts.

关键词： Oxygen electrocatalysts Electronic structure Noble metal-free electrocatalysts Active sites Intrinsic activity

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Side information refinement in distributed video coding

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High Technology Letters 2012年第4期18卷 423-427页

作者：刘鸿彬 Zhao Debin Ma Siwei Gao Wen School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 P. R. China School of electronics Engineering and Computer Science Peking University Beijing 100871 P. R. China

Side information （SI） is one of the key issues in distributed video coding （DVC） and affects the compression performance of DVC largely. This paper proposes an SI refinement algorithm, in which the Wyner-Ziv （WZ） frame is split into two parts based on checkerboard pattern, and the two parts are encoded independently but decoded sequentially. In the decoding process, the part 1 is first decoded with the initial SI and partially decoded part （PDP） 1 is used to improve the motion vectors （MVs） and SI of both parts. At the next stage, the part 2 is decoded with the improved SI and PDP 2 is used to further refine MVs of the part 2. Then, SI of both parts are further refined. Simulation results show that the proposed algorithm can improve the peak signal to noise ratio （PSNR） by up to 1.43 dB when compared with traditional DVC codec.

关键词： distributed video coding (DVC) side information (SI) checkerboard pattern

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Chinese Chemical Letters 2023年第1期34卷 203-205页

作者： Mingjun Zhong Qimeng Wu Liang Ma Jie Li Yifan Wang Yansong Wang Xin Li Yajie Zhang Jingtao Lü Yongfeng Wang Center for Carbon-based electronics and Key Laboratory for the Physics and Chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing 100871China Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China School of Physics Institute for Quantum Science and Engineeringand Wuhan National High Magnetic Field CenterHuazhong University of Science and TechnologyWuhan 430074China Beijing Academy of Quantum Information Sciences Beijing 100193China institute of Spin Science and Technology South China University of TechnologyGuangzhou 511442China

Spin properties of organic molecules have attracted great interest for their potential applications in spintronic devices and quantum ***-tetraphenyl porphyrin(Fe TPP)is of particular interest for its robust magnetic properties on metallic *** TPP is prepared in vacuum via on-surface *** structure and spin-related transport properties are characterized by low-temperature scanning tunneling microscope and spectroscopy at 0.5 *** functional theory calculations are performed to understand molecular adsorption and spin distribution on Au(111).The molecular structure of Fe TPP is distorted upon adsorption on the *** excitations of Fe TPP are observed on the Fe atom and high pyrrole groups in differential conductance *** calculated spin density distribution indicates that the electron spin of Fe TPP is mainly distributed on the Fe *** atomic transmission calculation indicates that electrons transport to substrate is mediated through Fe atom,when the tip is above the high pyrrole group.

关键词： Spintronics Spin excitation Atomic transmission Fe-tetraphenyl porphyrin STM

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Performance optimization of tri-gate junctionless FinFET using channel stack engineering for digital and analog/RF design

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Journal of Semiconductors 2023年第11期44卷 89-100页

作者： Devenderpal Singh Shalini Chaudhary Basudha Dewan Menka Yadav Department of electronics and Communication Engineering Malaviya National Institute of TechnologyJaipurRajasthan-302017India

This manuscript explores the behavior of a junctionless tri-gate FinFET at the nano-scale region using SiGe material for the *** the analysis,three different channel structures are used:(a)tri-layer stack channel(TLSC)(Si-SiGe-Si),(b)double layer stack channel(DLSC)(SiGe-Si),(c)single layer channel(SLC)(S_(i)).The I−V characteristics,subthreshold swing(SS),drain-induced barrier lowering(DIBL),threshold voltage(V_(t)),drain current(ION),OFF current(IOFF),and ON-OFF current ratio(ION/IOFF)are observed for the structures at a 20 nm gate *** is seen that TLSC provides 21.3%and 14.3%more ON current than DLSC and SLC,*** paper also explores the analog and RF factors such as input transconductance(g_(m)),output transconductance(gds),gain(gm/gds),transconductance generation factor(TGF),cut-off frequency(f_(T)),maximum oscillation frequency(f_(max)),gain frequency product(GFP)and linearity performance parameters such as second and third-order harmonics(g_(m2),g_(m3)),voltage intercept points(VIP_(2),VIP_(3))and 1-dB compression points for the three *** results show that the TLSC has a high analog performance due to more gm and provides 16.3%,48.4%more gain than SLC and DLSC,respectively and it also provides better *** the results are obtained using the VisualTCAD tool.

关键词： short channel effects(SCEs) junctionless FinFET analog and RF parameters SiGe

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A non-wetting and conductive polyethylene dioxothiophene hole transport layer for scalable and flexible perovskite solar cells

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Science China Chemistry 2021年第5期64卷 834-843页

作者： Chenxiang Gong Lin Zhang Xiangchuan Meng Zhi Xing Li Rao Hongyu Wang Zengqi Huang Licheng Tan Ting Hu Xiaotian Hu Yiwang Chen College of Chemistry Nanchang UniversityNanchang 330031China institute of Polymers and Energy Chemistry Nanchang UniversityNanchang 330031China Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China School of Materials Science and Engineering Nanchang UniversityNanchang 330031China institute of Advanced Scientific Research(iASR) Jiangxi Normal UniversityNanchang 330022China

The regulated crystallization of perovskite and highly repeatable preparation are decisive challenges for large-scale flexible perovskite solar cells(PSCs).Herein,we synthesize an oil-soluble poly(3,4-ethylenedioxythiophene)(Oil-PEDOT)as a hole transport layer(HTL).The non-wetting Oil-PEDOT HTL can promote the quality of large-area flexible perovskite films because of its optimized crystallinity and *** Oil-PEDOT layer also delivers desirable conductivity and charge transport without a complex ***,the flexible PSCs with Oil-PEDOT HTL achieve an efficiency of 19.51%and 16.70%based on 1.05 and 22.50 cm^(2),***,these large-scale flexible PSCs demonstrate remarkable mechanical robustness,and the efficiency exhibits 93%retention after 7,000 bending *** results show that the Oil-PEDOT is a potentially efficient HTL for fabricating efficient large-scale flexible PSCs.

关键词： non-wetting dopant-free hole transport layer flexible solar cells large-scale

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Shock-induced migration of asymmetry tilt grain boundary in iron bicrystal: A case study of Σ3 [110]

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Chinese Physics B 2019年第12期28卷 273-279页

作者： Xueyang Zhang Kun Wang Jun Chen Wangyu Hu Wenjun Zhu Shifang Xiao Huiqiu Deng Mengqiu Cai Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Center for Applied Physics and Technology Peking UniversityBeijing 100087China College of Materials Science and Engineering Hunan UniversityChangsha 410082China National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid PhysicsMianyang 621900China

Many of our previous studies have discussed the shock response of symmetrical grain boundaries in iron *** this paper, the molecular dynamics simulation of an iron bicrystal containing Σ3 [110] asymmetry tilt grain boundary(ATGB) under shock-loading is performed. We find that the shock response of asymmetric grain boundaries is quite different from that of symmetric grain boundaries. Especially, our simulation proves that shock can induce migration of asymmetric grain boundary in iron. We also find that the shape and local structure of grain boundary(GB) would not be changed during shock-induced migration of Σ3 [110] ATGB, while the phase transformation near the GB could affect migration of GB. The most important discovery is that the shock-induced shear stress difference between two sides of GB is the key factor leading to GB migration. Our simulation involves a variety of piston velocities, and the migration of GB seems to be less sensitive to the piston velocity. Finally, the kinetics of GB migration at lattice level is discussed. Our work firstly reports the simulation of shock-induced grain boundary migration in iron. It is of great significance to the theory of GB migration and material engineering.

关键词： shock-loading grain boundary migration iron phase transition

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