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Nano Research 2019年第7期12卷 1669-1674页

作者： Fanglong Yuan Ping He Zifan Xi Xiaohong li yunchao li Haizheng Zhong Louzhen Fan Shihe Yang College of Chemistry Beijing Normal UniversityBeijing 100875China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Guangdong Key Lab of Nano-Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055China

High-performance white light-emitting diodes (WLEDs) hold great potential for the next-generation backlight display ***,achieving highly efficient and stable WLEDs with wide-color-gamut has remained a formidable *** here is the first example of pure red narrow bandwidth emission triangular CQDs (PR-NBE-T-CQDs) with photoluminescence peaking at 610 *** PR-NBE-T-CQDs synthesized from resorcinol show high quantum yield (QY) of 72% with small full width at half maximum of 33 *** simply controlling the reaction time,pure green (PG-) NBE-T-CQDs with high QY of 75% were also *** efficient and stable WLEDs with wide-color-gamut based on PR- and PG-NBE-T-CQDs was *** WLED showed a remarkable wide-color gamut of 110% NTSC and high power efficiency of 86.5 lumens per ***,such WLEDs demonstrate outstanding *** work will set the stage for developing highly efficient,low cost and environment-friendly WLEDs based on CQDs for the next-generation wide-color gamut backlight displays.

关键词： pure red carbon quantum dots white light-emitting diodes wide-color gamut highly efficient

Precise vehicle ego-localization using feature matching of pavement images

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Journal of Intelligent and Connected Vehicles 2020年第2期3卷 37-47页

作者： Zijun Jiang Zhigang Xu yunchao li Haigen Min Jingmei Zhou Chang’an University Xi’anChina School of Information Engineering Chang’an UniversityXi’anChina

Purpose–Precise vehicle localization is a basic and critical technique for various intelligent transportation system(ITS)*** also needs to adapt to the complex road environments in *** global positioning system and the strap-down inertial navigation system are two common techniques in theﬁeld of vehicle ***,the localization accuracy,reliability and real-time performance of these two techniques can not satisfy the requirement of some critical ITS applications such as collision avoiding,vision enhancement and automatic *** at the problems above,this paper aims to propose a precise vehicle ego-localization method based on image ***/methodology/approach–This study included three steps,Step 1,extraction of feature *** getting the image,the local features in the pavement images were extracted using an improved speeded up robust features *** 2,eliminate mismatch *** a random sample consensus algorithm to eliminate mismatched points of road image and make match point pairs more *** 3,matching of feature points and trajectory ***–Through the matching and validation of the extracted local feature points,the relative translation and rotation offsets between two consecutive pavement images were calculated,eventually,the trajectory of the vehicle was ***/value–The experimental results show that the studied algorithm has an accuracy at decimeter-level and it fully meets the demand of the lane-level positioning in some critical ITS applications.

关键词： Feature extraction Image matching Intelligent transportation systems Intelligent vehicles Position measurement

Recent Advance in Carbon Dots: From Properties to Applications

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Chinese Journal of Chemistry 2021年第5期39卷 1364-1388页

作者： Hao Wu Huimin Xu Yuxin Shi Ting Yuan Ting Meng Yang Zhang Wenjing Xie Xiaohong li yunchao li Louzhen Fan College of Chemistry Key Laboratory of Theoretical&Computational Photochemistryand RadiopharmoceuticalsMinistry of EducationBeijing Normal UniversityBeijing 100875China

As a new type of nanomaterial,carbon dots(CDs)have been recognized as a versatile nanoplatform with enormous potential for biomedical and optoelectronic applications because of low cytotoxicity,photostability,biocompatibility and versatility in addition to their tunable *** this review,we aim at updating the latest research on preparation,optoelectronic and chemical properties of CDs as well as their biomedical and optoelectronic *** highlight the applications of CDs for stem cell imaging,cell nucleus imaging,two-photon fluorescence imaging,tumor diagnosis and therapy and their optoelectronic applications including light-emitting diodes(LEDs),solar cells and ***,we also discuss current challenges and breakthroughs on machine-learning-driven synthesis of CDs as well as nucleic acid detection with an eye towards the ***,we hope that this review will give further impulses to target-oriented research on CDs for biomedical and optoelectronic applications.

关键词： Carbon dots Cancer LEDs Machine-learning-driven synthesis Nucleic acids

Erratum to:Highly efficient and stable white LEDs based on pure red narrow bandwidth emission triangular carbon quantum dots for wide-color gamut backlight displays

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Nano Research 2020年第8期13卷 2309-2310页

作者： Fanglong Yuan Ping He Zifan Xi Xiaohong li yunchao li Haizheng Zhong Louzhen Fan Shihe Yang College of Chemistry Beijing Normal UniversityBeijing100875China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Guangdong Key Lab of Nano-Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen518055China

In the version of this article originally published,Figs.2(d)and 3(a),and Figs.S3 and S6 in the Electronic Supplementary Material(ESM)were *** corrected images are shown below.

关键词： narrow Highly triangular

依托“第二课堂”多维度开放实验室,拓展实验教学的深度和广度

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大学化学 2024年第7期39卷 99-105页

作者：乔晋萍李运超南彩云张媛魏朔赵云岺韩娟李玉峰全燕苹孙根班李会峰郭少师贺勇邓学彬张家新司书峰欧阳津北京师范大学化学学院化学国家级实验教学示范中心(北京师范大学)化学国家级虚拟仿真实验教学示范中心(北京师范大学)北京100875

实验教学是培养学生实践能力和创新能力的重要环节,如何突破课堂教学的时空限制有效实现实验资源的开放利用,是高校实验教学中心改革和建设的重要内容。本文以化学国家级实验教学示范中心(北京师范大学)为例,介绍本中心将有组织的“第... 详细信息

实验教学是培养学生实践能力和创新能力的重要环节,如何突破课堂教学的时空限制有效实现实验资源的开放利用,是高校实验教学中心改革和建设的重要内容。本文以化学国家级实验教学示范中心(北京师范大学)为例,介绍本中心将有组织的“第二课堂活动”纳入实验教学体系,探索并创建了多层次、多维度的实验室开放模式;通过举办丰富的实验竞赛/实践活动,支持大学生开展创新创业、学科竞赛、科学研究和科普宣传等活动,为学生提供了多样化的、以自驱为主、崇尚创新的实践训练机会,从而切实发挥了实验教学中心在创新人才培养中的支撑作用和在基础教育领域的辐射和示范作用。上述举措得力、育人效果显著,值得推广借鉴。

关键词：第二课堂实验竞赛实验室开放模式实验教学模式改革

超细半导体纳米线/棒的可控合成与新奇性质研究及功能应用

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科学通报 2022年第20期67卷 2280-2297页

作者：孙玉琢李冬邢观洁李运超北京师范大学化学学院北京100875 邯郸学院河北省杂环化合物重点实验室邯郸056005 唐山师范学院唐山市光电转换材料重点实验室唐山063000

超细半导体纳米线/棒是近年来发展起来的一类新型功能纳米材料,由于其具有接近原子尺度的直径和高度的结构各向异性,而表现出强烈的量子限域效应和界面效应,以及由此所伴生的诸多新奇的物理和化学性质,在光电器件与传感检测等领域具有... 详细信息

超细半导体纳米线/棒是近年来发展起来的一类新型功能纳米材料,由于其具有接近原子尺度的直径和高度的结构各向异性,而表现出强烈的量子限域效应和界面效应,以及由此所伴生的诸多新奇的物理和化学性质,在光电器件与传感检测等领域具有广阔的应用前景,是纳米材料领域研究的前沿和热点.鉴于其独特性和重要性,本文系统总结了超细半导体纳米线/棒领域近年来的研究和应用进展,着重介绍了其制备方法和光学、电学、磁学等新奇性质及其在光电转化、光电探测、光催化、气体传感等领域的应用原理和重要进展;在此基础上挖掘了调控其生长过程和理化性质的内在规律,凝练了该领域发展中所面临的关键难题,展望了未来可能的发展方向,希望借此推动这类特殊纳米材料的快速发展.

关键词：半导体超细纳米线/纳米棒合成方法光电性质功能应用

Carbon dots:An innovative luminescent nanomaterial

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Aggregate 2022年第3期3卷 80-97页

作者： Yuxin Shi Huimin Xu Ting Yuan Ting Meng Hao Wu Jianqiao Chang Haoyu Wang Xianzhi Song yunchao li Xiaohong li Yang Zhang Wenjing Xie Louzhen Fan College of Chemistry Key Laboratory of Theoretical&Computational Photochemistryand RadiopharmaceuticalsMinistry of EducationBeijing Normal UniversityBeijingChina

In recent years,carbon dots(CDs),including carbon nanodots,carbonized polymer dots,carbon quantum dots,and graphene quantum dots have attracted a mounting interest as readily accessible,nontoxic,and relatively inexpensive carbon-based ***,despite intense research for a number of years,a unifying picture is still lacking to clarify the exact definition,clear chemical structure,and unique optical properties of this family of *** this review,we systematically summarize the recent development of CDs from molecular design to related properties of excited states as well as their applications in optoelectronic devices and *** point out the current challenges,including exploring precise synthesis,clarifying the structure-property relationship,and regulating singlet and triplet states of fluorescence,phosphorescence,and delayed ***,the structural optimization of optoelectronic devices,tumor targeting mechanism,selective imaging,and drug delivery of CDs are also *** hope that the information provided in this review will inspire more exciting research on CDs from a brand-new perspective and promote practical application of CDs in multiple directions of current and future research.

关键词： biological application carbon dots optical properties optoelectronic device structure

Leaching kinetics of fluorine during the aluminum removal from spent li-ion battery cathode materials

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Journal of Environmental Sciences 2024年第4期138卷 312-325页

作者： Shengjie li Jianxin Zhu Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

The high content of aluminum(Al)impurity in the recycled cathode powder seriously affects the extraction efficiency of Nickel,Cobalt,Manganese,and lithium resources and the actual commercial value of recycled materials,so Al removal is crucially important to conform to the industrial standard of spent li-ion battery cathode *** this work,we systematically investigated the leaching process and optimum conditions associated with Al removal from the cathode powder materials collected in a wet cathode-powder peeling and recycling production line of spent li-ion batteries(liBs).Moreover,we specifically studied the leaching of fluorine(F)synergistically happened along with the removal process of Al,which was not concerned about in other studies,but one of the key factors affecting pollution prevention in the recovery *** mechanism of the whole process including the leaching of Al and F from the cathode powder was indicated by using NMR,FTIR,and XPS,and a defluoridation process was preliminarily investigated in this *** leaching kinetics of Al could be successfully described by the shrinking core model,controlled by the diffusion process and the activation energy was 11.14 kJ/***,the leaching of F was attributed to the dissolution of liPF6and decomposition of PVDF,and the kinetics associated was described by Avrami *** interaction of Al and F is advantageous to realize the defluoridation to some *** is expected that our investigation will provide theoretical support for the large-scale recycling of spent liBs.

关键词： Al removal F leaching Cathode powder Heating alkali leaching Leaching kinetics

Analysis on the Nutrition Composition and Antioxidant Activity of Different Types of Sweet Potato Cultivars

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Food and Nutrition Sciences 2015年第1期6卷 161-167页

作者： Hua Ji Haixin Zhang Hongtao li yunchao li Institute of Genetics and Physiology Hebei Academy of Agricultural and Forestry Science Shijiazhuang China Laboratory of Quality & Safety Risk Assessment for Agro-Products (Shijiazhuang) Ministry of Agriculture Shijiazhuang China Laboratory of Quality & Safety Risk Assessment for Agro-Products (Shijiazhuang) Ministry of Agriculture Shijiazhuang China

In this study, we selected four different color fleshed sweet potatoes, purple- (Jizi 01), red- (Xinong 431), yellow- (Beijing 553) and white- (Shangshu 19) fleshed cultivars as test materials, analyzed nutrient composition, dietary fiber content, anthocyanins quantification, and total phenolics content, and also measured their total antioxidant activity in four different types of sweet potato. In view of differences in flesh color, the nutrient contents of different cultivars appeared to be significantly different. Starch contents of Beijing 553 and Shangshu 19 were higher, but fat contents were lower than others. Protein content of Shangshu 19 was the highest followed by Jizi 01 and Xinong 431. In addition, our analysis results confirmed that purple fleshed sweet potato possesses much higher anthocyanins content than others, even up to 6.23 mg/g dry matter. Also, dietary fiber, total phenolics content, and total antioxidant capacity of Jizi 01 were significantly higher.

关键词： Sweet Potato Nutrition Composition Antioxidant Activity Anthocynin

Highly-chlorinated inert and robust interphase without mineralization of oxide enhancing high-rate li metal batteries

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Chinese Chemical Letters 2024年第6期35卷 239-243页

作者： Long li Kang Yang Chenpeng Xi Mengchao li Borong li Gui Xu Yuanbin Xiao Xiancai Cui Zhiliang liu lingyun li Yan Yu Chengkai Yang Key Laboratory of Advanced Materials Technologies International(HongKong Macao and Taiwan)Joint Laboratory on Advanced Materials TechnologiesSchool of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China College of Material Sciences and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

Side reactions and dendrite growth triggered by the unstable interface and inhomogeneous deposition have become the biggest obstacle to the commercialization for lithium metal *** this study,a highly-chlorinated organic-inorganic hybrid interfacial protective layer is developed by rationally tuning the interfacial passivation and robustness to achieve the convenient and efficient li metal *** polyvinyl chloride(PVC)can effectively resist water and oxygen,which is confirmed by density functional *** organic-dominant solid electrolyte interphases(SEI)with lithium chloride are investigated by the X-ray photoelectron spectroscopy(XPS)with little mineralization of oxide,such as li_(2)O and li_(2)CO_(3).With such artificial SEI,a uniform and dense lithium deposition morphology are formed and an ultra-long stable cycle of over 500 h are achieved even at an ultra-high current density of 10 m A/cm^(2).Moreover,the simple and convenient protected anode also exhibits excellent battery stability when paired with the liNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)and liFePO_(4)(LFP)cathode,showing great potential for the commercial application of lithium metal batteries.

关键词： Highly-chlorinated Water/oxygen resistance Stable interphase Dendrite-free lithium metal batteries High-rate