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few-layer fbrmamidinium lead bromide nanoplatelets for ultrapuregreen and high-efficiency light-emitting diodes

Nano Research 2019年第1期12卷 171-176页

作者： Huan Fang Wei Deng Xiujuan Zhang Xiuzhen Xu Meng Zhang Jiansheng Jie Xiaohong Zhang Institute of Functional Nano&Soft Materials(FUNSOM) Collaborative Innovation Center of Suzhou Nano Science and Technology(NANO-CIC)Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China

Formamidinium lead bromide perovskite(FAPbBr3)nanocrystals have attracted increasing attention due to their greener photoluminescence(PL)and higher thermal stability in comparison to more popular methylammonium lead bromide perovskite(MAPbBr3).Here we proposed a-facile and highly reproducible room-temperature method for the preparation of fewlayer(1-4)two-dimensional(2D)FAPbBr3 nanoplatelets(NPs)with ultrapure green PL at 532 nm and high photoluminescence quantum yield(PLQY)of 88%.High-efficiency ultrapure green light-emitting diodes(LEDs)based on the few-layer 2D FAPbBr3 NPs were further *** LEDs showed a maximum current efficiency(CE)of 15.31cd/A and an external quantum efficiency(EQE)of 3.53%,which are significantly better than the FAPbBr3 polycrystalline film-based LEDs reported so ***,the 2D FAPbBr3 NPs-based LEDs exhibited an ultrapure-green color emission that could cover 97%of the Recommendation 2020(Rec.2020)color standard and 114%of the national television system committee(NTSC)standard in the CIE 1931 color ***,the devices possessed a much better stability than the MAPbBr3 nanocrystals-based LEDs in air;the half lifetime T50 of our devices was about 5 times Ion ger than that of MAPbBr3 nan ocrystals-based *** work demonstrates the great potential of FAPbBr3 NPs in light-emitting devices for future ultrahigh-resolution displays.

关键词： formamidinium lead bromide perovskite few-layer nanoplatelets high-efficiency light-emitting diodes ultrapure-green electroluminescence

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Supercapacitor electrode based on few-layer h-BNNSs/rGO composite for wide-temperature-range operation with robust stable cycling performance

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 220-231页

作者： Tao Yang Hui-juan Liu Fan Bai En-hui Wang Jun-hong Chen Kuo-Chih Chou Xin-mei Hou Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

Currently,developing supercapacitors with robust cycle stability and suitability for wide-temperature-range operations is still a huge *** the present work,few-layer hexagonal boron nitride nanosheets(h-BNNSs)with a thickness of 2−4 atomic layers were fabricated via vacuum freeze-drying and ***,the h-BNNSs/reduced graphene oxide(rGO)composite were further prepared using a hydrothermal *** to the combination of two two-dimensional(2D)van der Waals-bonded materials,the as-prepared h-BNNSs/rGO electrode exhibited robustness to wide-temperature-range operations from−10 to 50℃.When the electrodes worked in a neutral aqueous electrolyte(1 M Na2SO4),they showed a great stable cycling performance with almost 107%reservation of the initial capacitance at 0℃ and 111% at 50℃ for 5000 charge−discharge cycles.

关键词： few-layer hexagonal boron nitride wide-temperature-range operation cycling performance

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Electrochemical exfoliation for few-layer graphene in molybdate aqueous solution and its application for fast electrothermal film

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Progress in Natural Science:Materials International 2020年第3期30卷 312-320页

作者： Juan Wu Hongfei Wang Jun Qiu Jingwen Shao Kefu Zhang Lifeng Yan CAS Key Laboratory of Soft Matter Chemistry Hefei National Laboratory for Physical Sciences at the Microscale And Department of Chemical Physics University of Science and Technology of China

There are still serious barriers from laboratory exploration to large-scale production of commercializing highquality graphene, especially by environmental-friendly methods. In this study, a simple and efficient electrochemical method for the preparation of high-quality water-dispersible graphene has been developed using molybdate aqueous solutions as the electrolyte. The exfoliation of graphite paper could be achieved in the electrolyte with a high yield of a few layers graphene（1–5 layers, 76%） and uniform lateral size（1–6 μm, 90%）.The as-obtained few layers graphene well dispersed in aqueous solution with a solubility of ～4 mg mL-1and stability for at least 2 months. It provides a new green method to prepare high-quality graphene. The as-prepared water-dispersible graphene films exhibit significant electrothermal performance, with a steady-state temperature of 147 °C under voltage of 10 V and a maximum heating rate achieved of 11.8 °C s-1.

关键词： Graphene Electrochemical Exfoliation few-layer Electrothermal film

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Lithium-assisted exfoliation of pristine graphite for few-layer graphene nanosheets

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Nano Research 2015年第3期8卷 801-807页

作者： Minwei Xu Huiting Sun Cai Shen Sen Yang Wenxiu Que Yin Zhang Xiaoping Song MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Xi'an Jiaotong University Xi'an 710049 China Electronic Materials Research Laboratory International Center for Dielectric Research Xi'an Jiaotong University Xi'an 710049 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China School of Materials Science and Engineering Tongji University Shanghai 201804 China

A lithium-assisted approach has been developed for the exfoliation of pristine graphite, which allows the large-scale preparation of few-layer graphene nanosheets. The process involves an unexpected physical insertion and exfoliafion, and the graphene nanosheets prepared by this method reveal undisturbed sp2-hybridized structures. A possible two-step mechanism, which involves the negative charge being trapped around the edges of the graphite layers and a subsequent lithiation process, is proposed to explain the insertion of lithium inside the graphite interlayers. If necessary, the present exfoliation can be repeated and thinner （single or 2-3 layer） graphene can be achieved on a large scale. This simple process provides an efficient process for the exfoliation of pristine graphite, which might promote the future applications of graphene.

关键词： graphene few-layer lithium Intercalation exfoliation

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Stacking control in graphene-based materials: A promising method for fascinating physical properties

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Frontiers of physics 2019年第2期14卷 45-46页

作者： Ji-Liang Zhang Guang-Cun Shan Department of Energy and Materials Engineering Dongguk UniversitySeoul 04620Republic of Korea Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong SARChina Institute of Quantum Sensing School of Instrumentation Science and Opto-Electronic EngineeringBeihang UniversityBeijing 100191China

Graphene, defined as a single atomic plane of graphite, is a semimetal with a small overlap between the valence and conduction bands. The stacking of graphene up to several atomic layers can lead to diverse physical properties, depending on the stacking method. Bi layer graphene is also a semimetal, adopting the AB-stacked (or Bernal-stacked) structure or the rare AA-stacked structure . Trilayer or few-layer graphene (FLG) can be semimetals or semiconductors, depending on whether they adopt Bernal (ABA) stacking or rhoinbohedral (ABC) stacking.

关键词： graphene-based materials few-layer graphene (FLG) adopt Bernal (ABA)

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硫掺杂氮化碳纳米片棒状聚集体用于光催化析氢

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Science China Materials 2023年第12期66卷 4669-4679页

作者：林斯颖吴宝刚李琪肖旭东郑芒刘佳男谢颖蒋保江 School of Chemistry and Materials Science Heilongjiang UniversityHarbin 150080China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

合成具有较宽吸收光谱的少层氮化碳是一个具有吸引力的课题.杂原子掺杂(特别是硫掺杂)可以有效地避免纳米级片层氮化碳中由于量子限制效应所引起的带隙加宽.与二次煅烧硫化不同的是,预硫化超分子前驱体可以原位地形成硫掺杂氮化碳纳米... 详细信息

合成具有较宽吸收光谱的少层氮化碳是一个具有吸引力的课题.杂原子掺杂(特别是硫掺杂)可以有效地避免纳米级片层氮化碳中由于量子限制效应所引起的带隙加宽.与二次煅烧硫化不同的是,预硫化超分子前驱体可以原位地形成硫掺杂氮化碳纳米片堆叠聚集体(SCN).这种少层的框架结构呈现出了更大的比表面积(139.06 m^(2)g^(−1)),暴露了更多的活性位点.此外,硫的引入使原七嗪环的共轭结构发生扭曲,从而通过激活价带电子的n→π*跃迁而缩小带隙.在模拟日光条件下,SCN0.8(3925.8μmol g^(−1)h^(−1))的析氢速率是块体氮化碳(BCN,485.2μmol g^(−1)h^(−1))的8.1倍.本工作旨在最大限度地利用杂原子掺杂和形态调控的协同效应来提高光催化活性,且为光催化剂的多维同步优化提供了新的视角.

关键词： sulfur-doped carbon nitride few-layer supramolecular self-assembly photocatalysis hydrogen evolution

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