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Low-dimensional van der Waals materials for linear-polarization-sensitive photodetection: materials, polarizing strategies and applications

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Materials Futures 2024年第1期3卷 95-127页

作者： Yuhang Ma Huaxin Yi Huanrong Liang Wan Wang Zhaoqiang Zheng Jiandong Yao Guowei Yang State Key Laboratory of Optoelectronic Materials and Technologies Nanotechnology Research CenterSchool of Materials Science&EngineeringSun Yat-sen UniversityGuangzhou 510275GuangdongPeople’s Republic of China Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices Sun Yat-sen UniversityGuangzhou 510275GuangdongPeople’s Republic of China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongPeople’s Republic of China

Detecting light from a wealth of physical degrees of freedom(***,intensity,polarization state,phase,etc)enables the acquirement of more comprehensive *** the past two decades,low-dimensional van der Waals materials(vdWMs)have established themselves as transformative building blocks toward lensless polarization optoelectronics,which is highly beneficial for optoelectronic system *** review provides a comprehensive overview on the recent development of low-dimensional vdWM polarized *** begin with,the exploitation of pristine 1D/2D vdWMs with immanent in-plane anisotropy and related heterostructures for filterless polarization-sensitive photodetectors is ***,we have systematically epitomized the various strategies to induce polarization photosensitivity and enhance the degree of anisotropy for low-dimensional vdWM photodetectors,including quantum tailoring,construction of core–shell structures,rolling engineering,ferroelectric regulation,strain engineering,etc,with emphasis on the fundamental physical *** that,the ingenious optoelectronic applications based on the low-dimensional vdWM polarized photodetectors,including multiplexing optical communications and enhanced-contrast imaging,have been *** the end,the current challenges along with the future prospects of this burgeoning research field have been *** the whole,the review depicts a fascinating landscape for the next-generation high-integration multifunctional optoelectronic systems.

关键词： polarization-discriminating photodetectors 1D van der Waals materials

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揭示配体拓扑结构对Fe-Nx-C单原子催化剂表面氧还原反应中间体吸附的影响（英文）

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Chinese Journal of Catalysis 2024年第4期59卷 214-224页

作者：吴德贵熊孝根赵中栋宋树芹丁朝斌中山大学化学工程与技术学院中山大学中法核工程与技术学院中山大学材料科学与技术学院

过渡金属单原子氮掺杂碳催化剂（TM-N-CSAC）因其更高的金属原子效率而被认为是提升氧还原反应（ORR）效率的重要途径.TM-N-CSAC反应中心的活性与配体结构密切相关,构建基于配体结构的ORR活性描述符是高效设计高催化活性单原子催化剂的... 详细信息

过渡金属单原子氮掺杂碳催化剂（TM-N-CSAC）因其更高的金属原子效率而被认为是提升氧还原反应（ORR）效率的重要途径.TM-N-CSAC反应中心的活性与配体结构密切相关,构建基于配体结构的ORR活性描述符是高效设计高催化活性单原子催化剂的关键.然而目前大多配体描述符基于催化剂的综合表观性质,如OH吸附能和金属中心d带中心等,其获取仍需进行额外计算,不利于通过配体结构快速推测反应活性;而目前基于配体结构拓扑参数,如金属中心原子及其配位原子属性、数量等设计的描述符存在对催化活性的描述较差或仅适用于特定配体等问题.解决该难题的关键在于理清OH与TM-N-C SAC成键的微观机制.本文全面考察了ORR中间体OH在21种具有不同氮原子数量、位置以及不同配体尺寸的卟啉型FeNxC SAC表面上的吸附机制.对有限尺寸卟啉型Fe-Nx-C （x=0-4）SAC模型上OH吸附的密度泛函理论计算结果表明, OH吸附能与SAC的配位氮原子的数量并不线性相关,且受氮原子排布方式的影响.利用能量分解分析（EDA）将OH与SAC的成键作用分解,重点讨论氮的掺入对静电作用、泡利排斥作用和轨道作用的影响.针对静电作用, Bader分析与电荷密度差值分析结果表明,氮的掺入一方面将电荷向配位原子上聚集,且配位原子上电荷数随氮原子数量增加而线性增加;另一方面大幅增强铁-配体键（Fe-L）的离子性,减少铁与配体间的电子密度,提高铁中心电子能量,并从而改变静电作用能量.对于泡利排斥作用,其影响因素与静电作用类似,因而作用强度与静电作用强度呈较好线性关系.对于轨道作用,结合扩展过渡态-化学价的自然轨道（ETS-NOCV）和电子定域化（LOL-π）等综合分析发现,氮原子的掺入破坏了配体的离域π键,从而影响OH与配体的轨道在成键时的相互作用.此外,对配体大小影响的研究表明,配体边缘原子仅当出现在包含配位原子的环上时才对OH与SAC成键有较大影响,这充分证明了OH吸附这一过程的局域性.综上,本文提供了Fe-N-C型SAC上完整的OH吸附键形成机制,强调了配位原子及其近邻原子对吸附活性的影响,为构建基于SAC拓扑特征的ORR活性描述符,实现SAC配体的快速筛选提供参考.

关键词：单原子催化剂氧还原反应配体拓扑结构能量分解分析密度泛函理论

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Emulsion confined block copolymer self-assembly:Recent progress and prospect

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Nano Research 2023年第1期16卷 564-582页

作者： Yilin Liu Fangfang Ke Yuanchao Li Yi Shi Zhen Zhang Yongming Chen School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510006China

In the past few decades,significant progress in block copolymer self-assembly has been achieved in many fields,and with the development of nanoscience and nanotechnology,more and more complex situations need block copolymer self-assembly based nanoplatforms having more complex structures for specific multimodal or multiplexed *** the combination of emulsification and self-assembly of the block copolymer,different materials with exotic architectures and functions could be combined within an entity,such as controlled vesicles,Janus particles,and composite particles which are more like ideal *** designs can show their different desired properties depending upon the application situation,including molecular delivery,surfactants,and multicolor *** review will provide a complete summary of the optimization and the synthesis method for the recently designed emulsion confined block copolymer assemblies,and also the challenges and limitations this method faces,and the potential solutions in this field.

关键词： emulsion block copolymer confined volume self-assembly exotic architectures

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Evolving Perspectives on Abrupt Seasonal Changes of the General Circulation

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Advances in Atmospheric Sciences 2017年第10期34卷 1185-1194页

作者： Jianhua LU Tapio SCHNEIDER School of Atmospheric Science Sun Yat-sen University Department of Environmental Science and Engineering California Institute of Technology

Professor Duzheng YE（Tu-cheng YEH） was decades ahead of his time in proposing a model experiment to investigate whether abrupt seasonal changes of the general circulation can arise through circulation feedbacks alone, unrelated to underlying inhomogeneities at the lower boundary. Here, we introduce Professor YEH＇s ideas during the 1950 s and 1960 s on the general circulation and summarize the results and suggestions of Yeh et al.（1959） on abrupt seasonal changes. We then review recent advances in understanding abrupt seasonal changes arising from model experiments like those proposed by Yeh et al.（1959）. The model experiments show that circulation feedbacks can indeed give rise to abrupt seasonal *** these transitions, large-scale eddies that originate in midlatitudes and interact with the zonal mean flow and meridional overturning circulations in the tropics play central roles.

关键词： abrupt change general circulation Hadley cell large-scale eddies

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Structural diversity and reactivity of d^(10) metal-(4-pyridylthio)acetate system

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Chinese Science Bulletin 2009年第23期54卷 4277-4284页

作者： ZHANG YueHua WANG Jing ZHENG LingLing HU Sheng LIN ZhuoJia TONG MingLiang Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education State Key Laboratory of Optoelectronic Materialsand Technologies School of Chemistry and Chemical Engineering Sun Yat-Sen University Guangzhou 510275 China

The hydrothermal synthesis and crystal structures of four coordination polymers, namely, 2D [Zn(μ3-ta)(pytaH)]n (1), 2D [Zn(μ3-pyta)Cl]n (2), 1D [Cd(μ-pyta)2(H2O)]n (3), and 3D [Cd(μ3-pyta)(μ-Cl)]n (4) (pyta = (4-pyridylthio)acetate, ta = thioglycolate), are reported. They are based on (4-pyridylthio)acetate and its derived ligand. The ta2ligand present in 1 was generated from an in situ C(sp2)-S bond cleavage of the pyta ligand. In these compounds, versatile intermolecular interactions, such as close S…S interactions and strong (O―H…O/N/S) or weak (C―H…O/S, C―H…Cl) hydrogen bonding interactions, play an important role in the formation of three-dimensional supramolecular networks in the solid state.

关键词：晶体结构醋酸多样性氢键相互作用反应金属系统水热合成

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基于N-掺杂碳包覆Fe3N复合材料的高效异相电芬顿降解有机物(英文)

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Chinese Journal of Catalysis 2021年第6期42卷 953-962页

作者：肖娟陈军伟欧祖翘赖俊杭俞同文王毅中山大学化学工程与技术学院材料科学与工程学院广东省低碳化学与过程节能重点实验室

水污染导致的缺水危机、水质恶化和生态环境破坏等问题,严重影响人的健康及社会的和谐可持续发展.异相电芬顿技术因催化剂可循环利用、宽pH适用范围等优点而广受关注.常见的催化剂以铁、铁氧化物等铁基材料为主,存在金属颗粒分布不均匀... 详细信息

水污染导致的缺水危机、水质恶化和生态环境破坏等问题,严重影响人的健康及社会的和谐可持续发展.异相电芬顿技术因催化剂可循环利用、宽pH适用范围等优点而广受关注.常见的催化剂以铁、铁氧化物等铁基材料为主,存在金属颗粒分布不均匀、铁元素易溶出、铁循环易受阻和HO选择性和转化效率低等问题,严重制约该技术的发展.尽管可以通过变价金属和非金属掺杂提高HO转化效率和选择性等,但铁基催化剂的异相电芬顿性能仍有待提升.因此,亟待开发一种具有合金性质且宽pH响应的高HO选择性及转化效率、高稳定性的铁基催化剂.本文利用具有高分散的金属位点和丰富碳源的铁基金属有机骨架材料,采用同步高温煅烧和氨气刻蚀等手段,制备N-掺杂碳包覆FeN复合材料(FeN@NG/NC),并探究了该材料在异相电芬顿降解有机污染物体系中的应用前景.XRD, SEM和TEM测试结果表明, FeN@NG/NC催化剂是由N-掺杂的石墨化碳包覆的FeN纳米颗粒(大小约为70 nm)均匀分散在N-掺杂碳骨架材料中组成的,这一特殊结构有利于电荷的快速传输,有助于电催化氧还原产HO及其转化至·OH反应的发生.电化学测试结果表明,该催化剂具有良好的两电子氧还原性能,在电压范围为–0.3～0.1 V内的HO选择性为82.2%～74.5%,电子转移数为2.35～2.50.电子顺磁共振光谱结果表明,该催化剂在异相电芬顿体系中主要的活性物质为·***结果表明,该催化剂中高含量的石墨N和吡啶N、Fe(Ⅱ)有利于电催化合成HO和活化HO至·OH,使其具有高效的异相电芬顿性能.异相电芬顿降解评估结果表明,该催化剂在pH 5.0体系中120 min内能高效去除罗丹明(RhB)、邻苯二甲酸二甲酯、亚甲基蓝和橙黄Ⅱ等多种有机污染物(有机物去除率为97%～100%, TOC去除率为49%～65%),不同RhB降解体对其去除率贡献程度依次为异相电芬顿>电催化>电生成HO氧化>O氧化>吸附;能实现宽pH范围内RhB的高效去除(在pH为3.0, 5.0, 7.0和9.0条件下,在60 min内的RhB去除率分别为100%, 96%, 92%和81%);在宽pH范围内呈现出高稳定性,铁溶出量为0～0.03 mg/L;经过6次循环使用后,仍具有高的异相电芬顿性能(去除率达90%以上).综上所述,FeN@NG/NC复合材料能作为良好的异相电芬顿催化剂,应用于污水处理领域.

关键词： Fe3N@NG/NC复合材料异相电芬顿金属有机骨架降解有机污染物

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An Fe-N/S-C hybrid electrocatalyst derived from bimetal-organic framework for efficiently electrocatalyzing oxygen reduction reaction in acidic media

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Journal of Energy Chemistry 2021年第1期30卷 291-300,I0010页

作者： Shuqin Song Mingmei Wu Junwei Chen Zhuohua Mo Rui Chen Kun Wang Tongwen Yu The Key Lab of Low-carbon Chemistry&Energy Conservation of Guangdong Province School of Materials Science and EngineeringSchool of ChemistrySchool of Chemical Engineering and TechnologySun Yat-sen UniversityGuangzhou 510275GuangdongChina

Heteroatoms doped Fe-N-C electrocatalysts have been widely acknowledged as one of the most promising candidates to replace Pt-based materials for electrocatalyzing oxygen reduction reaction(ORR).However,the complicated synthesis method and controversial catalytic mechanism represent a substantial impediment as of ***,a very facile strategy to prepare Fe-N/S-C hybrid through pyrolyzing Zn and Fe bimetallic MOFs is rationally *** electrocatalytic ORR performance shows a volcanotype curve with the increment of added Fe *** half-wave potential(E1/2) for ORR at optimized Fe-N/S-C-10%(10%=n(Fe)/(n(Fe)+n(Zn)),n(Fe) and n(Zn) represent the moles of Fe2+ and Zn2+ in the precursors,respectively) shifts significantly to the positive direction of 19.6 mV with respect to that of Pt/C in acidic media,as well as a high 4 e selectivity and methanol *** 10,000 potential cycles,E1/2 exhibits a small negative shift of-27.5 mV at Fe-N/S-C-10% compared favorably with Pt/C(~141.0 mV).This can be attributed to:(ⅰ) large specific surface area(849 m^(2)/g) and hierarchically porous structure are favorable for the rapid mass transfer and active sites exposure;(ⅱ) the embedded Fecontaining nanoparticles in porous carbon are difficult to be moved and further agglomerated during the electrochemical accelerated aging test,further improving its stability;(ⅲ) there exist small Fecontaining nanoparticles,uniformly doped N and S,abundant Fe-N as efficiently active *** work represents a breakthrough in the development of high-efficient non-precious-metal catalysts(NPMCs)to address the current Pt-based electrocatalysts challenges.

关键词： Bimetallic MOFs Fe-N/S-C Oxygen reduction reaction Acidic media

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Endophytic bacteria associated with endangered plant Ferula sinkiangensis K. M. Shen in an arid land： diversity and plant growth-promoting traits

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Journal of Arid Land 2017年第3期9卷 432-445页

作者： LIU Yonghong GUO Jianwei LI Li Mipeshwaree D ASEM ZHANG Yongguang Osama A MOHAMAD Nimaichand SALAM LI Wenjun Key Laboratory of Biogeography and Bioresource in Arid Land Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China university.of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Crops with High Quality and Efficient Cultivation and Security Control Yunnan Higher Education Institutions Honghe University Mengzi 661100 China State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources School of Life Sciences Sun Yat-Sen University Guangzhou 510275 China Environmental Science Department Institute for Post Graduate of Environment Study Arish University Arish 45511 Egypt

Ferula spp. are traditional medicinal plants found in arid land. Large-scale excavation for extracting bioactive compounds from the plants in arid regions of Xinjiang over the last few years has, however, significandy decreased their distributions. Due to the urgent need for preservation of these plant resources, along with the need of searching for alternative source of the useful metabolites, it is important to screen the endophytic microbial resources associated with the plant Ferula sinkiangensis K. M. Shen. In the study, a total of 125 endophytic bacteria belonging to 3 phyla, 13 orders, 23 families, and 29 genera were isolated based on 16S rRNA gene sequencing data. Among the different isolates, three strains isolated from roots were potential novel species of the genera Porphyrobacter, Paracoccus and draycofatopsis. In this study, 79.4% and 57.1% of the total isolates were capable of producing indole-3-acetic acid （IAA） and siderophore, respectively. And, 40.6% of the strains inhibit the growth of fungal pathogen Afternaria alternata, 17.2% and 20.2% strains were positive for antagonism against Vertidllium dahlia 991 and V. dahlia 7, respectively. These results demonstrated that E sinkiangensis is a rich reservoir of endophytic bacterial resources with potential for production of biologically important functions such as plant growth-promoting factors.

关键词： endophytic bacteria Ferula sinkiangensis endangered species growth promoting

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Nano-bio interfaces effect of two-dimensional nanomaterials and their applications in cancer immunotherapy

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Acta Pharmaceutica Sinica B 2021年第11期11卷 3447-3464页

作者： Zhongmin Tang Yufen Xiao Na Kong Chuang Liu Wei Chen Xiangang Huang Daiyun Xu Jiang Ouyang Chan Feng Cong Wang Junqing Wang Han Zhang Wei Tao International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Center for Nanomedicine and Department of Anesthesiology Brigham and Women's HospitalHarvard Medical SchoolBostonMA 02115USA School of Pharmaceutical Sciences(Shenzhen) Sun Yat-sen UniversityGuangzhou 510275China

The field of two-dimensional(2D)nanomaterial-based cancer immunotherapy combines research from multiple subdisciplines of material science,nano-chemistry,in particular nanobiological interactions,immunology,and medicinal *** importantly,the"biological identity"of nanomaterials governed by bio-molecular corona in terms of bimolecular types,relative abundance,and conformation at the nanomaterial surface is now believed to influence blood circulation time,biodistribution,immune response,cellular uptake,and intracellular trafficking.A better understanding of nano-bio interactions can improve utilization of 2D nano-architectures for cancer immunotherapy and immunotheranostics,allowing them to be adapted or modified to treat other immune dysregulation syndromes including autoimmune diseases or inflammation,infection,tissue regeneration,and *** manuscript reviews the biological interactions and immunotherapeutic applications of 2D nanomaterials,including understanding their interactions with biological molecules of the immune system,summarizes and prospects the applications of 2D nanomaterials in cancer immunotherapy.

关键词： Two-dimensional nanomaterials Nano-bio interactions Immune system Antigens Adjuvants Modulators Cancer immunotherapy Biosensing

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