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One-step method to simultaneously synthesize separable Te and GeTe nanosheets

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Nano Research 2022年第7期15卷 6736-6742页

作者： Yuyu Yao Xueying Zhan Chuyun Ding Feng Wang Yanrong Wang Jia Yang Zhenxing Wang Jun He CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Sino-Danish College University of Chinese Academy of SciencesBeijing 100049China Department of Physics Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric PowerShanghai University of Electric PowerShanghai 200090China Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072China Sino-Danish Center for Education and Research Beijing 100049China

The chemical vapor deposition(CVD)method has been widely used to synthesize high-quality two-dimensional(2D)materials.However,just one type of product can be synthesized by general CVD at one time.Here,we demonstrate a one-step CVD method to simultaneously grow two types of products.Importantly,the products can be completely separated by selecting the deposition region.In detail,the controllable and completely separable growth forα-GeTe and Te nanosheets was realized by using one precursor-GeTe powder through the atmospheric pressure CVD(APCVD)approach.High crystal quality of the as-grownα-GeTe nansosheets and Te nanosheets have been proved by the high-resolution transmission electron microscopy(HRTEM)characterization.Further,the field-effect-transistor(FET)based onα-GeTe nanosheet manifests that the as-grownαGeTe nanosheet is a degenerate semiconductor due to the intrinsic Ge vacancies.Additionally,Te-based FET devices indicate that the good electrical performance of the as-grown Te nanosheet,such as high mobility of 900 cm2·V^(−1)·s^(−1)(at room temperature),high on/off ratio of>106(at 77 K),and good air-stability.The developed one-step CVD method shows the huge potentials for high-efficiency and high-quality material growth.

关键词： controllable growth completely separable growth α-GeTe crystal Te crystal high mobility

Breakthroughs on tailoring membrane materials for ethanol recovery by pervaporation

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Chinese Journal of Chemical Engineering 2022年第12期52卷 19-36页

作者： Xia zhan xueying Zhao Zhongyong Gao Rui Ge Juan Lu Luying Wang Jiding Li Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry Beijing Technology and Business UniversityBeijing 100048China The Institute of Medicinal Plant Development The Chinese Academy of Medical Sciences(CAMS)and Peking Union Medical College(PUMC)Beijing 100193China Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry UniversityBeijing 100083China The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Bioethanol, as a clean and renewable fuel, has gained increasing attention due to its major environmental benefits. Pervaporation(PV) is a promising and competitive technique for the recovery of ethanol from bioethanol fermentation systems due to the advantages of environmental friendliness, low energy consumption and easy coupling with fermentation process. The main challenge for the industrial application of ethanol perm-selective membranes is to break the trade-off effect between permeability and selectivity. As membrane is the heart of the pervaporation separation process, this article attempts to provide a comprehensive survey on the breakthroughs of ethanol perm-selective PV membranes from the perspectives of tailoring membrane materials to enhance PV separation performance. The research and development of polymeric and organic/inorganic hybrid membranes are reviewed to explore the fundamental structure-property-performance relationships. It is found that mixed matrix membranes with welldesigned membrane structures offer the hope of better control overphysi-/chemical microenvironment and cavity/pore size as well as size distribution, which may provide both high permeability and membrane selectivity to break the trade-off effect. The tentative perspective on the possible future directions of ethanol perm-selective membranes is also briefly discussed, which may provide some insights in developing a new generation of high-performance PV membranes for ethanol recovery.

关键词： Pervaporation Ethanol recovery Microstructure Polymeric membrane Mixed matrix membrane

Ultrasensitive solar-blind ultraviolet detection and optoelectronic neuromorphic computing using α-In_(2)Se_(3)phototransistors

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Frontiers of physics 2023年第3期18卷 81-90页

作者： Yuchen Cai Jia Yang Feng Wang Shuhui Li Yanrong Wang Xueying Zhan Fengmei Wang Ruiqing Cheng Zhenxing Wang Jun He CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072China

Detection of solar-blind ultraviolet(SB-UV)light is important in applications like confidential communication,flame detection,and missile warning system.However,the existing SB-UV photodetectors still show low sensitivities.In this work,we demonstrate the extraordinary SB-UV detection performance of α-In_(2)Se_(3 )phototransistors.Benefiting from the coupled semiconductor and ferroelectricity property,the phototransistor has an ultraweak detectable power of 17.85 fW,an ultrahigh gain of 1.2×10^(6),a responsivity of 2.6×10^(5) A/W,a detectivity of 1.3×10^(16) Jones and an ultralow noise-equivalent-power of 4.2×10^(–20 )W/Hz1/2 for 275 nm light.Its performance exceeds most other UV detectors,even including commercial photomultiplier tubes and avalanche photodiodes.It can be also implemented as an optoelectronic synapse for neuromorphic computing.A 784×300×10 artificial neural network(ANN)based on this optoelectronic synapse is constructed and demonstrated with a high recognition accuracy and good noise-tolerance for the Fashion-MNIST dataset.These extraordinary features endow this phototransistor with the potential for constructing advanced SB-UV detectors and intelligent hardware.

关键词： solar-blind ultraviolet detectors α-In_(2)Se_(3) optoelectronic synapse neuromorphic computing

Near-infrared optoelectronic synapses based on a Te/α-In2Se3 heterojunction for neuromorphic computing

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Science China(Information Sciences) 2023年第6期66卷 53-62页

作者： Tao YAN Yuchen CAI Yanrong WANG Jia YANG Shuhui LI Xueying Zhan Fengmei WANG Ruiqing CHENG Feng WANG Jun HE Zhenxing WANG CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology Key Laboratory of Carbon Fiber and Functional Polymers Ministry of EducationBeijing University of Chemical Technology Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan University

Neuromorphic computing based on artificial optoelectronic synapses has attracted considerable attention owing to its high time/power efficiency and parallel processing capability. However, existing devices are mainly suitable for only the visible range. Here, high-performance near-infrared optoelectronic memories and synapses were demonstrated using Te/α-In2Se3heterostructures. Owing to the entangled ferroelectricitysemiconducting properties of α-In2Se3, whose ferroelectric polarizations can be switched by photocarriers that migrated from the Te near-infrared light absorber, the device could be set into a non-volatile highresistance/low-resistance state through the application of positive gate voltages/near-infrared light pulses.Hence, the device could function as a high-performance photodetector, with a photoresponsive on/off ratio of 5.25 × 104/8.3 × 103and a specific detectivity of 2.6 × 1011/7.5 × 1010Jones at 1550/1940 nm. In addition,the device could function as a multi-state optoelectronic synapse with good stability and high linearity;moreover, using the device, we developed an optoelectronic artificial neural network with high recognition accuracies of 100% and 89.9% for a database composed of 64-pixel letters with 10% and 70% noise levels,respectively. Our work provides a feasible avenue for developing neuromorphic networks applicable in the infrared range.

关键词： near infrared phototransistor two-dimensional ferroelectric semiconductor artificial neural networks optoelectronic synapses

LATS1 K751 acetylation blocks activation of Hippo signalling and switches LATS1 from a tumor suppressor to an oncoprotein

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Science China(Life Sciences) 2022年第1期65卷 129-141页

作者： Siyuan Yang Weizhi Xu Cheng Liu Jiaqi Jin xueying Li Yuhan Jiang Lei zhang Xianbin Meng Jun zhan Hongquan zhang Department of Human Anatomy Histology and EmbryologyMOE Key Laboratory of Carcinogenesis and Translational Research and State Key Laboratory of Natural and Biomimetic DrugsPeking University Health Science CenterBeijing 100191China MOE Key Laboratory of Bioinformatics School of Life SciencesTsinghua UniversityBeijing 100084China

Large tumor suppressor 1(LATS1)is the key kinase controlling activation of Hippo signalling pathway.Post-translational modifications of LATS1 modulate its kinase activity.However,detailed mechanism underlying LATS1 stability and activation remains elusive.Here we report that LATS1 is acetylated by acetyltransferase CBP at K751 and is deacetylated by deacetylases SIRT3 and SIRT4.Acetylation at K751 stabilized LATS1 by decreasing LATS1 ubiquitination and inhibited LATS1 activation by reducing its phosphorylation.Mechanistically,LATS1 acetylation resulted in inhibition of YAP phosphorylation and degradation,leading to increased YAP nucleus translocation and promoted target gene expression.Functionally,LATS1-K751 Q,the acetylation mimic mutant potentiated lung cancer cell migration,invasion and tumor growth,whereas LATS1-K751 R,the acetylation deficient mutant inhibited these functions.Taken together,we demonstrated a previously unidentified post-translational modification of LATS1 that converts LATS1 from a tumor suppressor to a tumor promoter by suppression of Hippo signalling through acetylation of LATS1.

关键词： LATS1 acetylation LATS1 activation and inhibition Hippo signalling pathway lung adenocarcinoma

C1orf106, an innate immunity activator, is amplified in breast cancer and is required for basal-like/luminal progenitor fate decision

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Science China(Life Sciences) 2019年第9期62卷 1229-1242页

作者： Ji Ma Cheng Liu Decao Yang Jiagui Song Jing zhang Tianzhuo Wang Mengyuan Wang Weizhi Xu xueying Li Shigang Ding Jun zhan Hongquan zhang Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education) Department of AnatomyHistology and Embryologyand State Key Laboratory of Natural and Biomimetic DrugsPeking University Health Science CenterBeijing 100191China Department of Gastroenterology Peking University Third HospitalBeijing 100191China

Basal-like breast cancer with a luminal progenitor gene expression profile is an aggressive subtype of breast cancer with a poorer prognosis compared with other subtypes.However,genes that specifically promote basal-like breast cancer development remain largely unknown.Here,we report that a novel gene C1orf106 plays an important role in maintaining the feature of basal-like/luminal progenitors.C1orf106 is frequently amplified and overexpressed in basal-like breast cancer and is associated with a poor outcome in patients.In human TCGA database,C1orf106 expression was correlated with upregulation of ELF5 and downregulation of GATA3,two transcription factors that regulate mammary gland stem cell fate.Enhanced expression of C1orf106 promotes tumor progression and expression of basal-like/luminal progenitor marker ELF5;depletion of C1orf106 suppresses tumorigenesis and expression of basal-like/luminal progenitor marker GATA3.These findings suggest that C1orf106 maintains the basal-like/luminal progenitor character through balancing the expression of ELF5 and GATA3.Taken together,we demonstrated that C1orf106 is an important regulator for basal-like/luminal progenitors and targeting C1orf106 is of therapeutic value for breast cancer.

关键词： C1orf106 basal-like luminal progenitor breast cancer ELF5 GATA3

Reconfigurable photovoltaic effect for optoelectronic artificial synapse based on ferroelectric p-n junction

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Nano Research 2021年第11期14卷 4328-4335页

作者： Yanrong Wang Feng Wang Zhenxing Wang Junjun Wang Jia Yang Yuyu Yao Ningning Li Marshet Getaye Sendeku Xueying Zhan Congxin Shan Jun He CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing100190China Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan430072China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Sino-Danish college University of Chinese Academy of SciencesBeijing100049China Sino-Danish Centre for Education and Research Beijing100049China School of Physics and Engineering Zhengzhou UniversityZhengzhou450001China

Neuromorphic machine vision has attracted extensive attention on wide fields.However,both current and emerging strategies still suffer from power/time inefficiency,and/or low compatibility,complex device structure.Here we demonstrate a driving-voltage-free optoelectronic synaptic device using non-volatile reconfigurable photovoltaic effect based on MoTe_(2)/α-In_(2)Se_(3) ferroelectric p-n junctions.This function comes from the non-volatile reconfigurable built-in potential in the p-n junction that is related to the ferroelectric polarization inα-In_(2)Se_(3).Reconfigurable rectification behavior and photovoltaic effect are demonstrated firstly.Notably,the figure-of-merits for photovoltaic effect like photoelectrical conversion efficiency non-volatilely increases more than one order.Based on this,retina synapse-like vision functions are mimicked.Optoelectronic short-term and long-term plasticity,as well as basic neuromorphic learning and memory rule are achieved without applying driving voltage.Our work highlights the potential of ferroelectric p-n junctions for enhanced solar cell and low-power optoelectronic synaptic device for neuromorphic machine vision.

关键词： ferroelectric p-n junction reconfigurable rectification reconfigurable PV effect optoelectronic synaptic devices

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《流行病学》课程思政资源库建设指标的研究

中华流行病学杂志 2023年第9期44卷 1473-1479页

作者：缪珂高文静秦雪英吴涛詹思延北京大学公共卫生学院流行病与卫生统计学系/重大疾病流行病学教育部重点实验室北京100191

目的构建针对《流行病学》教材的课程思政资源库建设指标。方法利用德尔菲专家法对来自4所高校及1个出版社的15名专家进行2轮专家函询,计算指标重要性和可行性得分与专家意见集中程度、协调程度。结果 2轮函询后,专家积极系数为100.00%(... 详细信息

目的构建针对《流行病学》教材的课程思政资源库建设指标。方法利用德尔菲专家法对来自4所高校及1个出版社的15名专家进行2轮专家函询,计算指标重要性和可行性得分与专家意见集中程度、协调程度。结果 2轮函询后,专家积极系数为100.00%(15/15),专家权威系数均为0.83,2轮函询Kendall’’sW分别为0.27(P<0.05)和0.33(P<0.05)。最终得到包含4项一级指标与31项二级指标的《流行病学》课程思政资源库建设指标。结论本研究函询过程具有科学性,构建的《流行病学》课程思政资源库建设指标具有一定的权威性,可促进《流行病学》课程思政资源库建立。

关键词：课程思政资源库流行病学德尔菲法

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陆表物候监测的遥感指数多维度评估

遥感学报 2023年第11期27卷 2653-2669页

作者：孙莉昕朱文泉谢志英詹培李雪莹北京师范大学遥感科学国家重点实验室北京100875 北京师范大学地理科学学部北京市陆表遥感数据产品工程技术研究中心北京100875

针对陆表植被物候监测已发展了很多遥感指数,但不同遥感指数表征陆表植被季节性变化的能力存在差异。目前,有关陆表植被物候遥感指数的评估大多在不同标准下开展,导致研究结果间的可比性较差,致使无法根据不同区域选择出最佳的遥感指数... 详细信息

针对陆表植被物候监测已发展了很多遥感指数,但不同遥感指数表征陆表植被季节性变化的能力存在差异。目前,有关陆表植被物候遥感指数的评估大多在不同标准下开展,导致研究结果间的可比性较差,致使无法根据不同区域选择出最佳的遥感指数,从而影响大尺度(如半球乃至全球)的陆表物候监测精度。本文在北半球中高纬度地区,以75个碳通量塔站点的406条记录和129个物候相机站点的482条记录为参考标准,对10种遥感指数应用于陆表物候监测的能力进行了系统性评估,并从两个精度评估视角(物候提取准确度、物候变化趋势一致性)、4个维度(植被类型、地理环境、物候类型、物候事件)对比分析了各种情况下的最佳遥感指数及其精度。虽然部分遥感指数在多数情况下均表现最佳,但不同植被类型、地理环境、物候类型(功能物候、结构物候)、物候事件(春季、秋季)组合情况下的最佳遥感指数并不聚焦于少数几种,而是散布于各类遥感指数之中;即使是采用了最佳遥感指数,但在某些情况下,其用于陆表物候监测的误差仍较大。从不同的精度评估视角来看,物候提取准确度高的遥感指数并不一定与物候变化趋势一致性高的遥感指数相对应,说明应根据关注视角来选择最佳遥感指数。本文研究结果可为不同情况下的陆表植被物候监测提供最佳遥感指数选择依据,从而有利于提高大尺度的陆表植被物候监测精度以及评估其不确定性。

关键词：遥感指数陆表植被物候植被类型地理环境结构物候功能物候