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Water-soluble boron carbon oxynitride dots with excellent solid-state fluorescence and ultralong room-temperature phosphorescence

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Nano Research 2020年第12期13卷 3261-3267页

作者： Shenghui Han gang lian Xiaoliang Zeng Zhaozhen Cao Qilong Wang Deliang Cui Ching-Ping Wong State Key Lab of Crystal Materials Shandong UniversityJinan250100China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen518055China Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry&Chemical EngineeringShandong UniversityJinan250100China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia30332USA

Developing metal-free and long lifetime room-temperature phosphorescence(RTP)materials has received tremendous interest due to their numerous potential applications,of which stable triplet-excited state is the core ***,boron carbon oxynitride(BCNO)dots,emitting stable blue fluorescence and green RTP,are reported for the first *** obtained BCNO dots exhibit an unexpected ultralong RTP lifetime of 1.57 s,lasting over 8 s to naked *** effective doping of carbon and oxygen elements in boron nitride(BN)actually provides a small energy gap between singlet and triplet states,facilitating the intersystem crossing(ISC)and populating of triplet *** formation of compact cores via crystallization and effective inter-/intra-dot hydrogen bonds further stabilizes the excited triplet states and reduces quenching of RTP by oxygen at room *** on the water-soluble feature of BCNO dots,a novel advanced security ink is developed toward anti-counterfeiting tag and confidential information *** study extends BCNO dots to rarely exploited phosphorescence fields and also provides a facile strategy to prepare ultralong lifetime metal-free RTP materials.

关键词： boron carbon oxynitride dots room-temperature phosphorescence fluorescence colourless security ink anti-counterfeiting

MoS2-intercalated carbon hetero-layers bonded on graphene as electrode materials for enhanced sodium/potassium ion storage

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Nano Research 2023年第1期16卷 473-480页

作者： Laiying Jing Junwei Sun Chaoyang Sun Di Wu gang lian Deliang Cui Qilong Wang Haohai Yu State Key Lab of Crystal Materials Shandong UniversityJinan 250100China School of Materials Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry&Chemical EngineeringShandong UniversityJinan 250100China

MoS2 is considered as an ideal electrode material in the field of energy storage due to high theoretical specific capacity and unique layered ***,limited interlayer distance and poor intrinsic electrical conductivity restrict its potential realworld ***,an alternately intercalated structure of MoS2 monolayer and N-doped porous carbon(NC)layer is grown on reduced graphene oxide(rGO)via a chemical intercalated *** expanded interlayer distance of MoS2(0.96 nm),enlarged by the intercalation of N-doped porous carbon layers,can enhance ion diffusion mobility,provide additional reactive sites for ion storage and maintain the stability of electrode *** addition,the hierarchical structures between rGO substrate and intercalated N-doped carbon layers construct a three-dimensional(3D)conductive network,which can significantly improve the electrical conductivity and the structural *** a result,the rGO-supported MoS2/NC electrode exhibits an ultrahigh reversible capacity and remarkable long cycling stability for sodium-ion batteries(SIBs)and potassium-ion(PIBs).Meanwhile,the as-obtained MoS2/NC@rGO electrode also delivers a superior cycle performance of 250 mAh·g−1 after 160 cycles at 0.5 A·g−1 when employed as an anode for sodium-ion full cells.

关键词： MoS2 graphene expanded interlayer spacing sodium-ion batteries potassium-ion batteries

A General Strategy for Ordered Carrier Transport of Quasi‑2D and 3D Perovskite Films for Giant Self‑Powered Photoresponse and Ultrahigh Stability

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Nano-Micro Letters 2023年第8期15卷 128-140页

作者： Fei Zhu gang lian Deliang Cui Qilong Wang Haohai Yu Huaijin Zhang Qingbo Meng Ching‑Ping Wong State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100People’s Republic of China Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry&Chemical EngineeringShandong UniversityJinan 250100People’s Republic of China Key Laboratory for Renewable Energy Chinese Academy of Sciences(CAS)BeijingPeople’s Republic of China Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsCASBeijing 100190People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

Organic–inorganic hybrid perovskite materials have been focusing more attention in the field of self-powered photodetectors due to their superb photoelectric ***,a universal growth approach is required and challenging to realize vertically oriented growth and grain boundary fusion of 2D and 3D perovskite grains to promote ordered carrier transport,which determines superior photoresponse and high ***,a general thermal-pressed(TP)strategy is designed to solve the above issues,achieving uniaxial orientation and single-grain penetration along the film thickness *** constructs the efficient channel for ordered carrier transport between two *** of the improved crystal quality and lower trap-state density,the quasi-2D and 3D perovskite-based self-powered photodetector devices(with/without hole transport layer)all exhibit giant and stable photoresponse in a wide spectrum range and specific wavelength *** the MAPbI_(3)-based self-powered photodetectors,the largest R_(λ) value is as high as 0.57 A W^(−1)at 760 nm,which is larger than most reported ***,under laser illumination(532 nm),the FPEA_(2)MA_(4)Pb_(5)I_(16)-based device exhibits a high responsivity(0.4 A W^(−1)) value,which is one of the best results in 2DRP self-powered *** addition,fast response,ultralow detection limit,and markedly improved humidity,optical and heat stabilities are clearly demonstrated for these TP-based devices.

关键词： Perovskites Thermal-pressed strategy Uniaxial orientation Self-powered photodetectors Stability

Porous-hollow nanorods constructed from alternate intercalation of carbon and MoS2 monolayers for lithium and sodium storage

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Nano Research 2019年第8期12卷 1912-1920页

作者： Laiying Jing gang lian Junru Wang Mingwen Zhao Xizheng Liu Qilong Wang Deliang Cui Ching-Ping Wong State Key Lab of Crystal Materials Shandong UniversityJinan 250100China School of Physics Shandong UniversityJinan 250100China Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100China School of Materials Science and Engineering Georgia Institute of Technology AtlantaGeorgia 30332USA

Weak ion diffusion and electron transport due to limited interlayer spacing and poor electrical conductivity have been identified as critical roadbacks for fast and abundant energy storage of both MoS2-based lithium ion batteries (LIBs) and sodium ion batteries (SIBs). In this work, MoS2 porous-hollow nanorods (MoS2/m-C800) have been designed and synthesized via an annealing-followed chemistry-intercalated strategy to solve the two issues. They are uniformly assembled from ultrathin MoS2 nanosheets, deviated to the rod-axis direction, with expanded interlayer spacing due to alternate intercalation of N-doped carbon monolayers between the adjacent MoS2 monolayers. Electrochemical studies of the MoS2/m-C800 sample, as an anode of LIBs, demonstrate that the superstructure can deliver a reversible discharge capacity of 1,170 mAh·g^-1 after 100 cycles at 0.2 A·g^-1 and maintain a reversible capacity of 951 mAh·g^-1 at 1.25 A·g^-1 after 350 cycles. While for SIBs, the superstructure also delivers a reversible discharge capacity of 350 mAh·g^-1 at 0.5 A-g-1 after 500 cycles and exhibits superior rate capacity of 238 mAh·g^-1 at 15 A·g^-1 .The excellent electrochemical performance is closely related with the hierarchical superstructures, including expanded interlayer spacing, alternate intercalation of carbon monolayers and mesoporous feature, which effectively reduce ion diffusion barrier, shorten ion diffusion paths and improve electrical conductivity.

关键词： lithium/sodium ion batteries porous-hollow nanorods expanded interlayer spacing alternate intercalation ultrathin nanosheets

Assembly of flower-like VS_(2)/N-doped porous carbon with expanded(001)plane on rGO for superior Na-ion and K-ion storage

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Nano Research 2022年第5期15卷 4108-4116页

作者： Junwei Sun gang lian Laiying Jing Di Wu Deliang Cui Qilong Wang Haohai Yu Huaijin Zhang Ching-Ping Wong State Key Lab of Crystal Materials Shandong UniversityJinan 250100China School of Materials Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry&Chemical EngineeringShandong UniversityJinan 250100China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332USA

VS2 with natural layered structure and metallic conductivity is a prospective candidate for sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs).However,due to large radius of Na+and K+,the limited interlayer spacing(0.57 nm)of VS2 generally determines high ion diffusion barrier and large volume variation,resulting in unsatisfactory electrochemical performance of SIBs and *** this work,flower-like VS_(2)/N-doped carbon(VS_(2)/N-C)with expanded(001)plane is grown on reduced graphene oxide(rGO)via a solvothermal and subsequently carbonization *** the VS_(2)/N-C@rGO nanohybrids,the ultrathin VS2"petals"are alternately intercalated by the N-doped porous carbon monolayers to achieve an expanded interlayer spacing(1.02 nm),which can effectively reduce ions diffusion barrier,expose abundant active sites for Na+/K+intercalation,and tolerate large volume *** N-C and rGO carbonous materials can significantly promote the electrical conductivity and structural *** from the synergistic effect,the VS2/N-C@rGO electrode exhibits large reversible capacity(Na+:407 mAh·g^(-1) at 1 A·g^(-1);K^(+):334 mAh·g^(-1) at 0.2 A·g^(-1)),high rate capacity(Na+:273 mAh·g^(-1) at 8 A·g^(-1);K+:186 mAh·g^(-1) at 5 A·g^(-1)),and remarkable cycling stability(Na+:316 mAh·g^(-1) at 2 A·g^(-1) after 1,400 cycles;K^(+):216 mAh·g^(-1) at 1 A·g^(-1) after 500 cycles).

关键词： VS_(2) N-doped porous carbon,graphene substrate expanded interlayer spacing sodium-ion batteries potassium-ion batteries

Investigation on the key factors in the hydrothermal synthesis of BN: The way of introducing sodium azide

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Chinese Science Bulletin 2007年第13期52卷 1785-1790页

作者： LI Kai JIANG HaiHui lian gang WANG QiLong ZHAO Xian CUI Deliang TAO XuTang State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China School of Chemistry & Chemical Engineering Shandong University Jinan 250100 China Shandong Institute of Light Industry Jinan 250100 China

The way of introducing sodium azide (NaN_3) into the reaction solution played an important role in the preparation of cBN by hydrothermal synthesis method. The results showed that both cBN content and crystalline perfection of the samples improved with increasing R_N value, and pure cBN could be obtained at 300℃ and 10 MPa when R_N increased to 3:1. Here R_N is defined as R_N =NaN_3(I)/NaN_3(II), wherNaN_3(I) denotes the amount of NaN_3 (in molar) that is added into the autoclave at the beginning of threaction process, and NaN_3(II) is the amount of NaN_3 (also in molar) introduced into the autoclave ahigh temperature and high pressure (i.e. 300℃ and 10 MPa). In order to explain the experimental results, a preliminary model was proposed in this paper.

关键词：水热合成叠氮化钠化学实验研究

Multi-step Reaction Route Developed for Improving Crystallinity of Boron Nitride Nanoparticles

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Chemical Research in Chinese Universities 2012年第3期28卷 387-390页

作者： TAN Miao lian gang ZHANG Xiao ZHANG Shun-jie CUI De-liang WANG Qi-long State Key Laboratory of Crystal Materialst Shandong UniversityJinan 250100P.R.China School of Chemistry&Chemical Engineering Shandong UniversityJinan 250100P.R.China

A multi-step reaction route was developed to synthesize boron nitride（BN） nanoparticles via the reactionbetween NaN3 and BC13 in a benzene-thermal solution. By means of this route, the crystallinity of BN nanoparticleswas improved via increasing the reaction steps. Meanwhile, a phase transformation from hexagonal BN（hBN） or tur-bostratic BN（tBN） to cubic BN（cBN） occurred, resulting in the increase of cBN content. Moreover, the content ofcBN also slightly increased when the temperature was elevated from 265 ℃ to 280 ℃.

关键词： Boron nitride Multi-step reaction route Benzene-thermal synthesis Phase transformation

Neurogenesis by Activation of Inherent Neural Stem Cells in the Rat Hippocampus after Cerebral Infarction

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Chinese Medical Sciences Journal 2009年第1期24卷 41-45页

作者： Bo Zhang Ren-zhi wang Zhi-gang lian Yang Song Yong Yao Department of Neurosurgery the First Affiliated Hospital of Dalian Medical University Dalian 116011 China Department of Neurosurgery Peking Union Medical College Hospital Chinese Academy of Medical Sciences ＆ Peking Union Medical College Beijing 100730 China

Objective To investigate the changes of neural stem cells (NSCs) in the rat hippocampus after cerebral infarction (CI) and to evaluate the neurogenesis caused by the activation of NSCs. Methods CI models of rats were made and rats were assigned to 6 groups: sham-operated, 1 day, 3 days, 7 days, 14 days, and 28 days after CI. The dynamic expression of bromodeoxyuridine (BrdU), polysialylated neural cell adhesion molecule (PSA-NCAM), glial fibrillary acidic protein (GFAP), and neuronal nuclear antigen (NeuN) were determined by immunohistochemistry and immunofluorescence staining. BrdU was used to mark the proliferated NSCs. PSA-NCAM was used to mark the plasticity of activated NSCs. GFAP and NeuN were used to mark the differentiated NSCs. Results Compared with the controls, the number of BrdU+ cells in the hippocampus increased significantly at 1 day after CI (P<0.05), reached peak at 7 days after CI (P<0.05), decreased but still elevated compared with the controls at 14 days after CI (P<0.05), and nearly unchanged at 28 days after CI. The number of BrdU+/PSA-NCAM+ cells increased significantly at 7 days after CI (P<0.05), reached peak at 14 days after CI (P<0.05), and decreased but still elevated compared with the controls at 28 days after CI (P<0.05). The number of BrdU+/PSA-NCAM+ cells was equal to 60% of the number of BrdU+ cells in all the same period. The number of BrdU+/NeuN+ cells in the hippocampus increased significantly at 14 days after CI (P<0.05) and reached peak at 28 day after CI (P<0.05). The number of BrdU+/GFAP+cells in the hippocampus nearly unchanged after CI. Conclusion CI can stimulate the proliferation of inherent NSCs, and most proliferated NSCs may differentiate into neurons and represent neural plasticity.

关键词： cerebral infarction neural stem cells neurogenesis hippocampus

EXPERIMENTAL STUDY ON PLASTICITY OF PROLIFERATED NEURAL STEM CELLS IN ADULT RATS AFTER CEREBRAL INFARCTION

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Chinese Medical Sciences Journal 2006年第3期21卷 184-188页

作者： Bo Zhang Ren-zhi Wang Zhi-gang lian Yang Song Yong Yao Department of Neurosurgery the First Affiliated Hospital of Dalian Medical University Dalian 116011 Department of Neurosurgery Peking Union Medical College Hospital Chinese Academy of Medical Sciences ＆ Peking Union Medical College Beijing 100730

Objective To investigate whether there is endogenous neural stem cell proliferation and whether these proliferated neural stem cells represent neural plasticity in the adult rats after cerebral infarction. Methods Cerebral infarction models of rats were established and the dynamic expression of bromodeoxyuridine （BrdU）, BrdU/polysialylated neural cell adhesion molecule （PSA-NCAM） were determined by immunohistochemistry and immunofluorescence staining. BrdU was used to mark dividing neural stem cells. PSA-NCAM was used to mark the plasticity of neural stem cells. Results Compared with controls, the number of BrdU-positive cells in the subventricular zone （SVZ） and hippocampus increased significantly at 1st day after cerebral infarction （P 〈 0. 05 ）, reached maximum at 7th day, decreased markedly at 14th day, but it was still elevated compared with that of the controls （ P 〈 0. 05 ）. The number of BrdU-labeled with PSA-NCAM-positive cells increased significantly at 7th day （ P 〈 0. 05 ）, reached maximum at 14th day, markedly decreased at 28th day, but it was still elevated compared with that of the controls （P 〈 0. 05 ）. It was equal to 60% of the number of BrdU-positive cells in the same period. Conclusion Cerebral infarction may stimulate the proliferation of endogenous neural stem cells in situ and most proliferated neural stem cells represent neural plasticity.

关键词： cerebral infarction neural stem cell proliferation plasticity