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Salt-assisted vapor-liquid-solid growth of high-quality ultrathin nickel oxide flakes for artificial synapses in image recognition applications

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Nano Research 2024年第5期17卷 4622-4630页

作者： Hui Zhang Zongjie Shen Alei Li Lin Wang Qinan Wang Yunfei Li yunlei zhong Juntong Zhu Yong Zhang Mengjiao Han Dan Tian Chun Zhao Lixing Kang Qingwen Li School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China Division of Advanced Materials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China College of Energy Soochow Institute for Energy and Materials Innovationsand Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215123China Songshan Lake Materials Laboratory Dongguan 523808China School of Advanced Technology Xi’an Jiaotong-Liverpool UniversitySuzhou 215123China College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037China

Transition metal oxides have attracted intense interest owing to their abundant physical and chemical properties.The controlled preparation of large-area,high-quality two-dimensional crystals is essential for revealing their inherent properties and realizing high-performance devices.However,fabricating two-dimensional(2D)transition metal oxides using a general approach still presents substantial challenges.Herein,we successfully achieve highly crystalline nickel oxide(NiO)flakes with a thickness as thin as 3.3 nm through the salt-assisted vapor-liquid-solid(VLS)growth method,which demonstrated exceptional stability under ambient conditions.To explore the great potential of the NiO crystal in this work,an artificial synapse based on the NiO-flake resistive switching(RS)layer is investigated.Short-term and long-term synaptic behaviors are obtained with external stimuli.The artificial synaptic performance provides the foundation of the neuromorphic application,including handwriting number recognition based on artificial neuron network(ANN)and the virtually unsupervised learning capability based on generative adversarial network(GAN).This pioneering work not only paves new paths for the synthesis of 2D oxides in the future but also demonstrates the substantial potential of oxides in the field of neuromorphic computing.

关键词： nickel oxide(NiO)flakes vapor-liquid-solid(VLS)growth memristor synapse generative adversarial network(GAN)

Controlled growth of two-dimensional InAs single crystals via van der Waals epitaxy

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Nano Research 2022年第11期15卷 9954-9959页

作者： Jiuxiang Dai Teng Yang Zhitong Jin yunlei zhong Xianyu Hu Jingyi Zou Weigao Xu Tao Li Yuxuan Lin Xu Zhang Lin Zhou School of Chemistry and Chemical Engineering Frontiers Science Centre for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Electrical and Computer Engineering Carnegie Mellon UniversityPittsburghPA 15213USA Key Laboratory of Mesoscopic Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Electrical Engineering and Computer Sciences University of CaliforniaBerkeleyCA 94720USA

Two-dimensional(2D)indium arsenide(InAs)is promising for future electronic and optoelectronic applications such as highperformance nanoscale transistors,flexible and wearable devices,and high-sensitivity broadband photodetectors,and is advantageous for its heterogeneous integration with Si-based electronics.However,the synthesis of 2D InAs single crystals is challenging because of the nonlayered structure.Here we report the van der Waals epitaxy of 2D InAs single crystals,with their thickness down to 4.8 nm,and their lateral sizes up to~37μm.The as-grown InAs flakes have high crystalline quality and are homogenous.The thickness can be tuned by growth time and temperature.Moreover,we explore the thickness-dependent optical properties of InAs flakes.Transports measurement reveals that 2D InAs possesses high conductivity and high carrier mobility.Our work introduces InAs to 2D materials family and paves the way for applying 2D InAs in high-performance electronics and optoelectronics.

关键词： two-dimensional materials van der Waals epitaxy indium arsenide nonlayered material

肿瘤恶病质小鼠模型的建立及其相关分子机制研究进展

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国际呼吸杂志 2024年第5期44卷 598-604页

作者：高晨曦钟海林秋琪武良权杨健张允雷张秀伟南京医科大学附属江宁医院呼吸与危重症医学科南京211100

恶病质是肿瘤患者常见的临床并发症,表现为持续性体重下降、肌肉萎缩、乏力、贫血、营养不良等症状。建立肿瘤恶病质动物模型是探究其发病机制和寻找潜在治疗方法的重要策略之一。该类模型的建立有助于加深人们对恶病质发病机制的了解,... 详细信息

恶病质是肿瘤患者常见的临床并发症,表现为持续性体重下降、肌肉萎缩、乏力、贫血、营养不良等症状。建立肿瘤恶病质动物模型是探究其发病机制和寻找潜在治疗方法的重要策略之一。该类模型的建立有助于加深人们对恶病质发病机制的了解,以及肿瘤细胞与机体之间的相互作用,同时用于评估恶病质治疗药物的疗效和安全性。本文综述了肿瘤恶病质小鼠模型的建立及其相关分子机制的研究进展,并对肿瘤恶病质模型的构建和应用进行了讨论和展望。

关键词：肿瘤恶病质模型,动物发病机制

Advances in direct production of value-added chemicals via syngas conversion

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Science China Chemistry 2017年第7期60卷 887-903页

作者： yunlei An Tiejun Lin Fei Yu Yanzhang Yang Liangshu zhong Minghong Wu Yuhan Sun School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201203China University of the Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201203China

Syngas conversion to fuels and chemicals is one of the most challenging subjects in the field of C1 chemistry. It is considered as an attractive alternative non-petroleum-based production route. The direct synthesis of olefins and alcohols as high value-added chemicals from syngas has drawn particular attention due to its process simplicity, low energy consumption and clean utilization of carbon resource, which conforms to the principles of green carbon science. This review describes the recent advances for the direct production of lower olefins and higher alcohols via syngas conversion. Recent progress in the development of new catalyst systems for enhanced catalytic performance is highlighted. We also give recommendations regarding major challenges for further research in syngas conversion to various chemicals.

关键词：直接生产合成气化学品转化法催化剂系统化学领域生产路线直接合成

Effect of Y and Ce on the microstructure, mechanical properties and anisotropy of as-rolled Mg-8Li-1Al alloy

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Journal of Materials Science & Technology 2020年第4期39卷 124-134页

作者： Feng zhong Huajie Wu yunlei Jiao Ruizhi Wu Jinghuai Zhang Legan Hou Milin Zhang Key Laboratory of Superlight Material and Surface Technology(Harbin Engineering University) Ministry of EducationHarbin 150001China College of Science Heihe UniversityHeihe UniversityHeihe 164300China Tianjin Institute of Aerospace Mechanical and Electrical Equipment Tianjin 300301China

The effects of combined addition of Y and Ce on the microstructure,mechanical properties and anisotropy of as-rolled Mg-8 Li-1 Al(LA81)alloy were studied.The combined addition of Y and Ce improves the mechanical properties with a low plasticity loss by solution strengthening,dispersion strengthening,grain refinement strengthening.Mg-8 Li-1 Al-0.6 Y-0.6 Ce(LA81-0.6 Y-0.6 Ce)has better mechanical properties and shows an almost isotropy.It possesses an ultimate tensile strength of 278.7 MPa and an elongation of 15.0%.Compared to LA81 alloy,the ultimate tensile strength increases by about 17.6%with an elongation reduction of only 3.5%,and a good isotropy of ultimate tensile strength and elongation(the value of ravg is near 1).

关键词： Mg-Li alloy Cross rolling Alloying Mechanical properties Anisotropy

Effect of Sodium on the Structure-Performance Relationship of Co/SiO2 for Fischer-Tropsch Synthesis

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Chinese Journal of Chemistry 2017年第6期35卷 918-926页

作者： Yuanyuan Dai Fei Yu Zhengjia Li yunlei An Tiejun Lin Yanzhang Yang Liangshu zhong Hui wang Yuhan Sun CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201203 China University of the Chinese Academy of Sciences Beijing 100049 China School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China College of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China School of Physical Science and Technolog.v Shanghai Tech University Shanghai 201203 China

A series of Co/SiO2 catalysts with different sodium （Na）loadings （0, 0.1, 0.2, 0.5 and I wt%） were prepared and evaluated for Fischer-Tropsch reaction to study the effect of Na on the catalyst structure and catalytic performance. The addition of Na was found to decrease the catalytic activity and hydrocarbon selectivity, but increase CO2 selec- tivity due to the enhanced WGS activity. The addition of Na also resulted in higher selectivity to oxygenates （alco- hols and aldehydes） and O/P ratio as well as the shift of hydrocarbons to lower carbon numbers. Structure charac- terization revealed a decrease in the surface area and particles size for the calcined samples with the addition of Na. CozC was formed during the reaction process for the Na-promoted catalysts. As a result, a new Co/Co2C bifunc- tional active sites were generated for oxygenates formation leading to increasing oxygenates selectivity. In addition, the Co2C nanoparticles alone may also act as dual active sites for oxygenate formation at high reaction pressure over the promoted catalysts with high Na loading.

关键词： Fischer-Tropsch synthesis structure-performance relationship sodium cobalt carbide oxygenates

调控Co_(2)C局域浸润环境实现高碳效合成气直接制烯烃

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Chinese Journal of Catalysis 2023年第5期48卷 150-163页

作者：刘培功林铁军郭磊刘晓哲龚坤尧泰真安芸蕾钟良枢上海科技大学物质科学与技术学院上海201210 中国科学院上海高等研究院低碳转化科学与工程重点实验室上海201210 中国科学院大学北京100049

合成气转化是实现煤、天然气、生物质、固体废弃物及CO_(2)等非石油含碳资源清洁高效利用的关键过程,可合成多种清洁液体燃料和高附加值化学品,如汽油、柴油、航空煤油、固体石蜡、烯烃、芳烃和含氧化合物等.其中,合成气直接制烯烃(STO... 详细信息

合成气转化是实现煤、天然气、生物质、固体废弃物及CO_(2)等非石油含碳资源清洁高效利用的关键过程,可合成多种清洁液体燃料和高附加值化学品,如汽油、柴油、航空煤油、固体石蜡、烯烃、芳烃和含氧化合物等.其中,合成气直接制烯烃(STO)具有流程短、能耗低和经济性高等优点,备受学术界和工业界关注.近年来,合成气直接制烯烃取得了突破性进展,发展了基于氧化物-分子筛的双功能路线法以及改性费托路线法.然而,由于目前STO体系所使用的氧化物或者碳化物活性相同时也是水煤气变换(WGS)活性位点,导致反应过程产生30%-50%的CO_(2)副产物,造成较低的碳原子利用效率和烯烃收率,以及尾气产品分离能耗的增加.如何通过催化剂界面和局域环境的调控,创新反应路径,提高烯烃选择性和收率,降低C1副产物选择性已成为重大挑战.本文提出通过发展界面浸润性调控策略,将CoMnAl复合氧化物(CMA)衍生的CO_(2)C活性相与疏水SiO_(2)进行一定尺度的物理耦合,能够将CO_(2)选择性从47.8%降到16.8%,同时催化剂的活性提高30%,总产物中烯烃选择性也提高了~65%,体现出较高的碳效.FI-IR光谱和接触角测试结果表明,疏水基团成功引入到SiO_(2)载体上,并且通过粉末混合的方式获得了同样具备疏水特性的CoMnAl复合催化剂(CMASc).热重(TG-DTG)结果表明,即使样品经过300℃的高温处理,其疏水性仍然能得到保持.X射线衍射(XRD)和高分辨率透射电镜(HRTEM)表征结果表明,复合氧化物的活性中心仍是棱柱状Co_(2)C.进一步表征和探针实验解释了催化剂浸润性调变对Co_(2)C基催化剂FTO性能的影响.CO/H_(2)O-TPSR-MS实验表明,往体系中引入H_(2)O蒸气,CMASc催化剂产生的CO_(2)信号强度远低于单独CMA催化剂的.CO/H_(2)-TPSR-MS实验结果表明,在相同的温度下,CMASc催化剂上产生的H_(2)O信号强度高于CMA,而相应的CO_(2)信号强度则要低很多.在250-400℃,将产生的CO_(2)信号峰面积进行积分,发现CMA产生的CO_(2)浓度是CMASc的2.3倍.利用固定床开展CO/H_(2)和CO/H_(2)O探针切换实验,结果表明,在典型FTO反应条件下引入水蒸气到CMA催化剂体系后,CO转化率和尾气H_(2)/CO比大幅度提高,而CMASc上则出现相反趋势.这些实验证实了H_(2)O分子容易吸附在CMA上发生WGS反应,而在Co_(2)C活性位界面构建局域疏水环境有利于水分子快速转移,并防止其再次吸附.利用CO-DRIFTS和烯烃-H_(2)脉冲实验研究活性和烯烃选择性提高的原因.相比于CMA,CO更容易吸附在疏水CMASc上.H_(2)O的引入会导致CO在两个催化剂的强度变弱,但CMASc上吸附的CO强度仍要高于CMA.这说明活性位点存在水会阻碍CO的吸附,而CMASc上相对干燥的表面更有利于CO吸附及后续活化.调控H_(2)O分压探针实验也在宏观层面上验证了该结论,说明活性中心吸附的H_(2)O会抑制催化活性.丙烯加氢脉冲实验发现,浸润环境可以极大地影响烯烃的吸附和加氢能力.在H_(2)O存在的情况下,丙烯更容易在CMA上发生加氢生成丙烷,而疏水CMASc上丙烯更容易直接脱落,从而提高了烯烃选择性.综上,通过调控Co_(2)C活性位局域疏水环境,可以降低表面H_(2)O的吸附,抑制CO_(2)副产物生成,同时强化CO吸附和烯烃脱附,提高烯烃选择性和收率,这为高碳效Co_(2)C基催化剂的理性设计提供借鉴.

关键词：费托合成制烯烃合成气转化碳化钴疏水性低CO_(2)选择性

Na助剂对负载型Co_(2)C基FTO催化剂构效的影响

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化学反应工程与工艺 2022年第2期38卷 97-106页

作者：贾汭泽林铁军安芸蕾龚坤钟良枢孙予罕中国科学院上海高等研究院低碳转化科学与工程重点实验室上海201203 中国科学院大学北京100049

负载型催化剂具有活性组分分散度好、机械强度高等优点,在工业中应用广泛。围绕合成气经费托路线直接制备烯烃(FTO),本工作详细研究了Na助剂对SiO_(2)负载型Co_(2)C基催化剂构效关系的影响,发现随着Na含量的提高,CH_(4)选择性降低,烯烷... 详细信息

负载型催化剂具有活性组分分散度好、机械强度高等优点,在工业中应用广泛。围绕合成气经费托路线直接制备烯烃(FTO),本工作详细研究了Na助剂对SiO_(2)负载型Co_(2)C基催化剂构效关系的影响,发现随着Na含量的提高,CH_(4)选择性降低,烯烷比(物质的量之比)提高,烯烃选择性上升。结构表征表明:Na助剂的添加可有效调控SiO_(2)载体表面性质,弱化金属-载体间相互作用,促进CoMn复合氧化物的形成,同时加速Co物种的碳化速率,最终有利于暴露(101)和(020)晶面的棱柱状Co_(2)C纳米结构的形成,从而体现出良好的FTO催化性能。

关键词：合成气转化费托反应烯烃碳化钴助剂效应

强路易斯酸诱导构筑高离子电导率和界面稳定的复合电解质及其全固态锂金属电池

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Science China Materials 2022年第8期65卷 2179-2188页

作者：王立通仲云雷文钊锐李朝威赵景新葛明政周鹏飞张焱焱汤育欣洪果 Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacao SAR 999078China College of Chemical Engineering Fuzhou UniversityFuzhou 350116China Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoAvenida da UniversidadeTaipaMacao SAR 999078China School of Textile and Clothing Nantong UniversityNantong 226019China

开发高性能固态聚合物电解质是高安全、高比能固态锂金属电池的关键.然而,固态聚合物电解质的低离子电导率和不稳定的电解质/电极界面阻碍了其广泛应用.针对上述关键问题,本文基于聚环氧乙烷(PEO)基电解质,引入具有双功能的氟化铝(AlF_(... 详细信息

开发高性能固态聚合物电解质是高安全、高比能固态锂金属电池的关键.然而,固态聚合物电解质的低离子电导率和不稳定的电解质/电极界面阻碍了其广泛应用.针对上述关键问题,本文基于聚环氧乙烷(PEO)基电解质,引入具有双功能的氟化铝(AlF_(3))做为添加剂,以提高复合电解质的离子电导率和界面稳定性.一方面,AlF_(3)做为一种强路易斯酸,在和锂盐阴离子相互作用下可以促进锂盐的解离,同时可以固定阴离子,从而提高锂离子传输效率;另一方面,AlF3在电解质/电极界面可以和锂金属原位反应生成富含LiF的界面层,从而抑制锂金属的不均匀沉积以及与PEO基体之间持续的副反应.得益于我们的合理设计,匹配改性后电解质的Li/Li对称电池可以稳定循环3600 h以上.同时,在2.4-4.2 V电压区间内,匹配复合电解质的全固态LiFePO4全电池在150个循环之后库伦效率比没有AlF3添加剂PEO基电解质大大提升(98.4%vs.63.3%),匹配复合固态电解质的固态锂金属电池显示出优异的界面稳定性和循环稳定性.

关键词：复合电解质 LiFePO4 固态电解质离子电导率固态聚合物电解质界面稳定性电极界面全电池