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Switch type PANI/ZnO core-shell microwire heterojunction for UV photodetection

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Journal of Materials Science & Technology 2022年第10期105卷 259-265页

作者： Yihan Chen Longxing Su Mingming Jiang xiaosheng fang Department of Materials Science Fudan UniversityShanghai 200433China Department of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China College of Science Nanjing University of Aeronautics and AstronauticsNanjing 211106China

In this study,single crystal ZnO microwires(MW)with size of~5.4 mm×30μm are prepared through a chemical vapor deposition technique at high temperature(1200℃).Subsequently,p-type conducting polyaniline(PANI)polymers with different conductivities are densely coated on part of the ZnO MW to construct organic/inorganic core-shell heterojunction *** hetero-diodes reach an extremely high rectifcation ratio(I_(+3V)/I_(-3V))of 749230,and a maximum rejection ratio(I_(350nm)/I_(dark))of 3556(at-3 V),indicating great potential as rectifed *** the heterojunction devices exhibit strong response to ultraviolet(UV)radiation with high response ***,the obvious photovoltaic behavior can also be obtained,allowing the device to operate as an independent and stable unit without externally supplied *** 0 V bias voltage,the self-powered photodetector shows a maximum responsivity of 0.56 mA W~(-1)and a rapid response speed of 0.11 ms/1.45 ms(rise time/decay time).Finally,a fnite difference time domain(FDTD)simulation is performed to further demonstrate the interaction mechanism between the incident light feld and the hexagonal cavity,which strongly supports the enhancement of the light absorption in whispering-gallery-mode resonator.

关键词： Core-shell structure Heterojunction High rectifcation ratio Self-powered Photodetector

Decitabine in combination with idarubicin within a modified busulfan/cyclophosphamide conditioning regimen for patients with advanced myelodysplastic syndrome:A prospective multicenter clinical cohort study

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Chinese Medical Journal 2024年第9期137卷 1115-1117页

作者： Yigeng Cao Mingyang Wang Fuxu Wang Wenwen Guo Yueshen Ma Xiaoyun Li Yi He Aiming Pang Rongli Zhang Weihua Zhai Xin Chen Qiaoling Ma Jialin Wei Donglin Yang Yong Huang Dan Feng Jia Liu Xin Gao Shupeng Wen Wen Wang Tao Wang Ying Li xiaosheng fang Yingchun Li Xiaohan Zhang Yun Cai Yongqi Wang Weijie Cao Runqing Lu Sizhou Feng Rong Guo Yuewen Fu Xin Du Zhuogang Liu Xin Wang Ling Wang Liangming Ma Chuanfang Liu Xuejun Zhang Mingzhe Han Erlie Jiang Department of Hematopoietic Stem Cell Transplantation Center State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesHaihe Laboratory of Cell EcosystemInstitute of HematologyBlood Diseases HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjin 300000China Department of Hematology Second Hospital of Hebei Medical UniversityHebei Key Laboratory of HematologyShijiazhuangHebei 050000China Center for Information and Resource State Key Laboratory of Experimental HematologyNational Clinical Research Center for Blood DiseasesHaihe Laboratory of Cell EcosystemInstitute of HematologyBlood Diseases HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjin 300000China Department of Hematology Qilu Hospital of Shandong UniversityJinanShandong 250000China Department of Hematology Shanxi Bethune HospitalThird Hospital of Shanxi Medical UniversityTaiyuanShanxi 030032China Department of Hematology Qingdao Central HospitalUniversity of Health and Rehabilitation SciencesQingdaoShandong 266042China Department of Hematology Shandong Provincial HospitalCheeloo College of MedicineShandong UniversityJinanShandong 250000China Department of Hematology Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinanShandong 250000China Department of Hematology Shengjing Hospital of China Medical UniversityShenyangLiaoning 110000China Department of Hematology Shenzhen Second People’s HospitalThe First Affiliated Hospital of Shenzhen UniversityShenzhen University School of MedicineShenzhenGuangdong 518000China Department of Hematology Henan Cancer HospitalCancer Hospital Affiliated Zhengzhou UniversityZhengzhouHenan 450000China Department of Hematology Department of HematologyThe First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan 450000China

To the Editor:Allogeneic hemopoietic stem cell transplantation(allo-HSCT)represents the only long-term survival treatment choice for patients with myelodysplastic syndromes(MDS)and MDS/myeloproliferative neoplasm(MPN).Unfortunately,post-hemopoietic stem cell transplantation(HSCT)relapse remains a cause of treatment failure and the results of salvage treatments are *** better conditioning regimens is urgently *** studies have shown synergistic antileukemic effects between decitabine(DEC)and idarubicin(IDA).[1]In an attempt to design a conditioning strategy with very low toxicity but considerable myelosuppressive activity and potential immune-enhancing effects for patients with high-risk MDS and MDS/MPN,we combined DEC and IDA with busulfan,cyclophosphamide,andudarabine for a modied myeloablative regimen in this prospective,multicenter cohort study(hereafter referred to as the“DEC/IDA study”).

关键词： regimen myelo patients

Wafer-scale heterogeneous integration of self-powered lead-free metal halide UV photodetectors with ultrahigh stability and homogeneity

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Journal of Materials Science & Technology 2023年第33期164卷 150-159页

作者： Ming Deng Ziqing Li Xiaolei Deng Ying Hu xiaosheng fang Department of Materials Science State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200433China Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsFudan UniversityShanghai 200433China

Large-scale growth and heterogeneous integration with existing semiconductors are the main obstacles to the application of metal halide perovskites in ***,a universal vacuum evaporation strategy is presented to prepare copper halide films with wafer-scale spatial *** from the electric field manipulation method,the built-in electric fields are optimized and further boost the self-powered UV photodetecting performances of common wide-bandgap semiconductors by more than three orders of ***,with effective modulation of the interfacial charge dynamics,the as-fabricated GaN-substrate heterojunction photodetector demonstrates an ultrahigh on/off ratio exceeding 107,an impressive responsivity of up to 256 mA W^(-1),and a remarkable detectivity of 2.16×10^(13) Jones at 350 nm,0 V ***,the device exhibits an ultrafast response speed(t r/t d=716 ns/1.30 ms),an ultra-narrow photoresponse spectrum with an FWHM of 18 nm and outstanding continuous operational stability as well as long-term ***,a 372-pixel light-powered imaging sensor array with the coefficient of variation of photocurrents reducing to 5.20%is constructed,which demonstrates exceptional electrical homogeneity,operational reliability,and UV imaging *** strategy provides an efficient way for large-scale integration of metal halide perovskites with commercial semiconductors for miniature optoelectronic devices.

关键词： Photodetector Lead-free metal halide Wafer-scale Vacuum evaporation Imaging sensor

Integration of filter membrane and Ca_(2)Nb_(3)O_(10) nanosheets for high performance flexible UV photodetectors

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Journal of Materials Science & Technology 2022年第34期129卷 108-114页

作者： Yong Zhang Fa Cao Siyuan Li Xinya Liu Lixing Kang Limin Wu xiaosheng fang School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Department of Materials Science Fudan UniversityShanghai 200433China Division of Advanced Materials Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

We report that the integration of filter membrane and Ca_(2)Nb_(3)O_(10)nanosheets(FM@CNO) UV photodetector(UV PD) shows high performance and excellent flexibility. The Ca_(2)Nb_(3)O_(10)nanosheets were prepared by a facile solid-state reaction and liquid exfoliation process. The Ca_(2)Nb_(3)O_(10)nanosheets can be integrated into the pores of a filter membrane via a simple vacuum filtration method. The FM@CNO UV PD shows high performance under 300 nm light illumination at 5 V bias, including high responsivity(0.08 AW^(-1)), high detectivity(1.1 × 10^(12)Jones), high UV/visible rejection ratio(3.86 × 10^(3)) and fast speed(0.12/1.24 ms). Furthermore, the FM@CNO device exhibits excellent flexibility after many bending *** addition, the FM@CNO array device was used as a pixel array detector for UV imaging. This work provides a novel approach to achieve high performance flexible PDs based on filter membrane and two dimensional materials.

关键词： UV photodetector Ca_(2)Nb_(3)O_(10)nanosheets Filter membrane Flexible

Two-dimensional perovskite Pb_(2)Nb_(3)O_(10) photodetectors

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Journal of Materials Science & Technology 2023年第33期164卷 95-101页

作者： Yong Zhang Jian Yao Zhen Zhang Rong Zhang Li Li Yu Teng Zongjie Shen Lixing Kang Limin Wu xiaosheng fang School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Division of Advanced Materials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Department of Materials Science State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200433China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

For the first time,we report high-performance two-dimensional(2D)perovskite Pb_(2)Nb_(3)O_(10) photodetectors(PNO PDs).The few-layer PNO nanosheets are obtained successfully through a simple calcination and liquid exfoliation *** individual PNO nanosheet devices with various structures(Au-PNO-Au,Au-PNO-Ti,Ti-PNO-Ti)are fabricated and *** Au-PNO-Ti device exhibits a high rectification factor(∼102)owing to a large Schottky barrier difference between the PNO nanosheet and two asymmetric ***,the Au-PNO-Ti device shows excellent self-powered performance,including high responsivity(2.8 A/W),high detectivity(1.1×10^(12) Jones),and fast speed(0.2/1.2 ms)at 350 nm light *** work not only suggests the performance of the PNO nanosheet PDs but also sheds light on the development of high-stability and high-performance devices based on 2D perovskite niobate in the future.

关键词： Pb2Nb3O10 Photodetectors Self-powered Two-dimensional Perovskite

One-Dimensional (1D) ZnS Nanomaterials and Nanostructures

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Journal of Materials Science & Technology 2006年第6期22卷 721-736,I0001-I0002页

作者： xiaosheng fang Lide ZHANG Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences P.O.Box 1129 Hefei 230031 China

One-dimensional （1D） nanomaterials and nanostructures have received much attention due to their potential interest for understanding fundamental physical concepts and for applications in constructing nanoscale electric and optoelectronic devices. Zinc sulfide （ZnS） is an important semiconductor compound of Ⅱ-Ⅵ group, and the synthesis of 1D ZnS nanomaterials and nanostructures has been of growing interest owing to their promising application in nanoscale optoelectronic devices. This paper reviews the recent progress on 1D ZnS nanomaterials and nanostructures, including nanowires, nanowire arrays, nanorods, nanobelts or nanoribbons, nanocables, and hierarchical nanostructures etc. This article begins with a survey of various methods that have been developed for generating 1D nanomaterials and nanostructures, and then mainly focuses on structures, synthesis, characterization, formation mechanisms and optical property tuning, and luminescence mechanisms of 1D ZnS nanomaterials and nanostructures. Finally, this review concludes with personal views towards future research on 1D ZnS nanomaterials and nanostructures.

关键词： One-dimensional ZnS Nanomaterials Nanostructures

Controlled Growth of One-Dimensional Oxide Nanomaterials

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Journal of Materials Science & Technology 2006年第1期22卷 1-18页

作者： xiaosheng fang Lide ZHANG Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences P.O. Box 1129Hefei 230031 China

This article reviews the recent developments in the controlled growth of one-dimensional （1D） oxide nanomaterials, including ZnO, SnO2, In203, Ga203, SiOx, MgO, and Al203. The growth of 2D oxide nanomaterials was carried out in a simple chemical vapor transport and condensation system. This article will begin with a survey of nanotechnology and 1D nanomaterials achieved by many researchers, and then mainly discuss on the controlled growth of ID oxide nanomaterials with their morphologies, sizes, compositions, and microstructures controlled by altering experimental parameters, such as the temperature at the source material and the substrate, temperature gradient in the tube furnace, the total reaction time, the heating rate of the furnace, the gas flow rate, and the starting material. Their roles in the formation of various morphologies are analyzed and discussed. Finally, this review will be concluded with personal perspectives on the future research directions of this area.

关键词： Controlled growth One-dimensional Oxide Nanomaterials

Bi-based Nanowire and Nanojunction Arrays:Fabrication and Physical Properties

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Journal of Materials Science & Technology 2007年第2期23卷 166-181页

作者： Liang LI Guanghai LI xiaosheng fang Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Nanoscale Materials Center National Institute for Materials Science （NIMS）Namiki 1-1 Tsukuba Ibaraki 305-0044Japan

This article reviews the recent developments in the fabrication and properties of one-dimensional （1D） Bi-based nanostructures, including Bi, Sb, BixSb1-x and Bi2Te3 nanowire arrays, and Bi-Bi and Bi-Sb nanojunction arrays. In this article, we present an efiective method to fabricate Bi nanowire arrays with difierent diameters in anodic alumina membrane （AAM） with a single pore size by the pulsed electrodeposition. The fabrication of the high-filling and ordered Bi1-xSbx and Bi2Te3 single crystalline nanowire arrays, the Bi nanowire metalsemiconductor homojunction and Bi-Sb nanowire metal-semiconductor heterojunction arrays by the pulsed electrodeposition are reported. The factors controlling the composition, diameter, growth rate and orientation of the nanowires are analyzed, and the growth mechanism of the nanowire and nanojunction arrays are discussed together with the study of the electrical and thermal properties of Bi-based nanowires and ***, this review is concluded with some perspectives on the research directions and focuses in the Bi-based nanomaterials fields.

关键词： Bi One-dimensional Nanowire array Thermoelectric Electrodeposition

SGT-Net: A Transformer-Based Stratified Graph Convolutional Network for 3D Point Cloud Semantic Segmentation

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Computers, Materials & Continua 2024年第6期79卷 4471-4489页

作者： Suyi Liu Jianning Chi Chengdong Wu fang Xu xiaosheng Yu Faculty of Robot Science and Engineering Northeastern UniversityShenyang110167China State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang110016China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang110169China SIASUN Robot&Automation Co. Ltd.Shenyang110169China

In recent years,semantic segmentation on 3D point cloud data has attracted much *** 2D images where pixels distribute regularly in the image domain,3D point clouds in non-Euclidean space are irregular and inherently ***,it is very difficult to extract long-range contexts and effectively aggregate local features for semantic segmentation in 3D point cloud *** current methods either focus on local feature aggregation or long-range context dependency,but fail to directly establish a global-local feature extractor to complete the point cloud semantic segmentation *** this paper,we propose a Transformer-based stratified graph convolutional network(SGT-Net),which enlarges the effective receptive field and builds direct long-range ***,we first propose a novel dense-sparse sampling strategy that provides dense local vertices and sparse long-distance vertices for subsequent graph convolutional network(GCN).Secondly,we propose a multi-key self-attention mechanism based on the Transformer to further weight augmentation for crucial neighboring relationships and enlarge the effective receptive *** addition,to further improve the efficiency of the network,we propose a similarity measurement module to determine whether the neighborhood near the center point is *** demonstrate the validity and superiority of our method on the S3DIS and ShapeNet *** ablation experiments and segmentation visualization,we verify that the SGT model can improve the performance of the point cloud semantic segmentation.

关键词： 3D point cloud semantic segmentation long-range contexts global-local feature graph convolutional network dense-sparse sampling strategy