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电化学和紫外-可见吸收光谱法研究pH和金纳米粒子对细胞色素c的影响

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物理化学学报 2012年第5期28卷 1127-1133页

作者：王艳艳姜艳霞沙德礼罗德礼孙世刚厦门大学化学化工学院化学系固体表面物理化学国家重点实验室福建厦门361005 香港城市大学物理与材料科学系

制备了粒径均匀、平均粒子尺度为(4.7±0.6)nm,表面修饰3-巯基丙酸(MPA)的金纳米粒子(AuNPs).利用电化学和紫外-可见(UV-Vis)吸收光谱研究了pH和AuNPs对细胞色素c(Cytc)结构的影响.UV-Vis吸收光谱结果表明,pH为7.5-3.0时,Cytc和Cytc-Au... 详细信息

制备了粒径均匀、平均粒子尺度为(4.7±0.6)nm,表面修饰3-巯基丙酸(MPA)的金纳米粒子(AuNPs).利用电化学和紫外-可见(UV-Vis)吸收光谱研究了pH和AuNPs对细胞色素c(Cytc)结构的影响.UV-Vis吸收光谱结果表明,pH为7.5-3.0时,Cytc和Cytc-AuNPs复合物的结构没有发生明显变化.当pH=2.0时,Cytc和Cytc-AuNPs复合物的Soret谱峰位置均发生明显移动,说明pH诱导其构象发生变化.循环伏安(CV)结果表明,表面修饰了MPA的AuNPs能促进Cytc和电极之间的电子传输,与修饰了柠檬酸根的AuNPs相比,其生物兼容性更好.pH的变化会引起CV中Cytc峰电流的改变和峰电位的移动.随着pH值的降低,Cytc电活性的量逐渐减小,并且pH诱导Cytc发生不可逆变性.AuNPs的引入使自由态的Cytc耐酸性增强,而使得吸附态的Cytc耐酸能力减弱.

关键词：金纳米粒子细胞色素c pH值循环伏安法紫外-可见吸收光谱

Ligand density control boosts the efficiency of all-inorganic CsPbBr3 perovskite nanocrystal based light emitting diodes

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Science Bulletin 2017年第5期62卷 314-315页

作者： andrey L. rogach Department of Physics and Materials Science Centre for Functional Photonics (CFP) City University of Hong Kong Hong Kong China

Lead halide perovskites attracted a lot of attention in the last several years,with a focus gradually shifting from the record power conversion efficiencies reported for photovoltaic devices based on thin perovskite f... 详细信息

关键词： LEDs Ligand density control boosts the efficiency of all-inorganic Cs Pb Br3 perovskite nanocrystal based light emitting diodes Cs Pb Br

Towards next generation white LEDs:opticselectronics synergistic effect in a single-layer heterophase halide perovskite

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Light(Science & Applications) 2021年第3期10卷 310-312页

作者： andrey L.rogach Departm ent of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong SARPR China

A novel concept of the heterophase optics-electronics synergistic effect has been demonstrated in a single-layerα/δ-heterophase perovskite CsPbl3 in order to realize white LEDs featuring only one broadband emissive ... 详细信息

关键词： optics synergistic white

Chiral carbon dots:synthesis,optical properties,and emerging applications

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Light(Science & Applications) 2022年第4期11卷 542-564页

作者： Aaron Doring Elena Ushakova andrey L.rogach Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong SARChina. Center of Information Optical Technologies ITMO UniversitySaint Petersburg 197101Russia. Shenzhen Research Institute City University of Hong Kong518057 ShenzhenChina

Carbon dots are luminescent carbonaceous nanoparticles that can be endowed with chiral properties,making them particularly interesting for biomedical applications due to their low cytotoxicity and facile *** recent years,synthetic efforts leading to chiral carbon dots with other attractive optical properties such as two-photon absorption and circularly polarized light emission have *** start this review by introducing examples of molecular chirality and its origins and providing a summary of chiroptical spectroscopy used for its *** approaches used to induce chirality in nanomaterials are *** the main part of this review we focus on chiral carbon dots,introducing their fabrication techniques such as bottom-up and top-down chemical syntheses,their morphology,and optical/chiroptical *** then consider emerging applications of chiral carbon dots in sensing,bioimaging,and catalysis,and conclude this review with a summary and future challenges.

关键词： properties synthesis chiral

Template synthesis of silver indium sulfide based nanocrystals performed through cation exchange in organic and aqueous media

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Nano Research 2021年第7期14卷 2321-2329页

作者： Na Gao Rubo Zhang Bingkun Chen Jinfeng Zhang Xiaoling Zhang andrey L.rogach School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China School of Life Science Beijing Institute of TechnologyBeijing 100081China Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong SARChina

Heavy-metal-free silver based I-III-VI semiconductor nanocrystals(NCs),including ternary silver indium sulfide(AgInS_(2))and derivative quaternary silver indium zinc sulfide(i.e.,AgInZn_(2)S_(4))NCs,possess advantages of low toxicity,and size-tunable band gaps approaching near-infrared spectral range,which make them candidates for use in optoelectronic and biological ***,we report syntheses of AgInS_(2) based NCs starting from In_(2)S_(3) template,which have been performed both in organic and aqueous phase through cation *** a result,ternary silver indium sulfide and quaternary silver indium zinc sulfide NCs are obtained in both organic and aqueous media,and confirmed to be orthorhombic AgInS_(2) NCs and hexagonal AgInZn_(2)S_(4) NCs,***,the aqueous AgInZn_(2)S_(4) NCs with red emission and low cytotoxicity are explored for the cancer cell imaging.

关键词： template synthesis silver indium sulfide based nanocrystals cation exchange organic and aqueous media

Aggregation-induced emission of copper nanoclusters

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Aggregate

Aggregate 2021年第6期2卷 28-42页

作者： Yu-e Shi Jinzhu Ma Anrui Feng Zhenguang Wang andrey L.rogach Key Laboratory of Chemical Biology of Hebei Province Key Laboratory of Medicinal Chemistry and Molecular DiagnosisMinistry of EducationCollege of Chemistry&Environmental ScienceHebei UniversityBaodingP.R.China Department of Materials Science and Engineering&Centre for Functional Photonics(CFP) City University of Hong KongKowloonHong KongS.A.R.P.R.China

Copper nanoclusters(Cu NCs)have recently emerged as promising luminophores,featuring ultra-small size,reasonable photostability,large Stokes shift,and long emission ***-induced emission(AIE)has been often used to further improve both the emission intensity and stability of these clusters,with plenty of potential applications in the fields of chemical sensing and *** review starts with a summary of the current understanding of emission mechanisms of Cu NCs and proceeds with the analysis of contributions from the Cu metal core and the organic *** summarize the recent research progress on the design of ligands,and the ways on how to induce aggregation of the Cu NCs through electrostatic charge neutralization,host-guest interactions,and the use of *** also discuss the current understanding of emission mechanisms of Cu NCs experiencing AIE,such as the often-cited restriction of intramolecular motion and contributions from Cu(I)molecular *** finish this review by providing concluding remarks and offering our own perspective on the active field of AIE of Cu NCs,with a hope to further promote the research on the fundamental aspects of this useful phenomenon.

关键词： aggregation-induced emission copper nanoclusters surface ligands

In-situ fabricated anisotropic halide perovskite nanocrystals in polyvinylalcohol nanofibers: Shape tuning and polarized emission

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Nano Research 2019年第6期12卷 1411-1416页

作者： Linghai Meng Changgang Yang Jingjia Meng Yongzhi Wang Yong Ge Ziqiang Shao Guofeng Zhang andrey L.rogach Haizheng Zhong Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Engineering Research Center of Cellulose and Its Derivatives School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing H 100081China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Department of Materials Science and Engineering and Centre for Functional Photonics (CFP)City University of Hong KongHong Kong 999077China

We report an in-situ fabrication of halide perovskite (CH3NH3PbX3,CH3NH3 =methylammonium,MA,X =Cl,Br,I) nanocrystals in polyvinylalcohol (PVA) nanofibers (MAPbX3@PVA nanofibers) through electrospinning a perovskite precursor *** the content of the precursors increased,the resulting MAPbBr3 nanocrystals in PVA matrix changed the shape from ellipsoidal to pearl-like,and finely into *** MAPbBr3@PVA nanofibers show strong polarized emission with the photoluminescence quantum yield of up to 72%.We reveal correlations between the shape of in-situ fabricated perovskite nanocrystals and the polarization degree of their emission by comparing experimental data from the single nanofiber measurements with theoretical *** emission of MAPbBr3@PVA nanofibers can be attributed to the dielectric confinement and quantum confinement ***,nanofibers can be efficiently aligned by using parallel positioned conductor strips with an air gap as collector.A polarization ratio of 0.42 was achieved for the films of well-aligned MAPbBr3@PVA nanofibers with a macroscale size of 0.5 cm × 2 cm,which allows potential applications in displays,lasers,waveguides,etc.

关键词： lead halide perovskite nanofibers electrospinning anisotropy polarized emission

Photo-induced flexible semiconductor CdSe/CdS quantum rods alignment

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Journal of Semiconductors 2023年第9期44卷 83-89页

作者： Wanlong Zhang Julian Schneider Maksym F.Prodanov Valerii V.Vashchenko andrey L.rogach Xiaocong Yuan Abhishek K.Srivastava Nanophotonics Research Center Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China State Key Laboratory of Advanced Displays and Optoelectronics Technologies Department of Electronic&Computer EngineeringHong Kong University of Science and TechnologyHong Kong SARChina Department of Materials Science and Engineering and Centre for Functional Photonics(CFP) City University of Hong KongHong Kong SARChina

The anisotropic absorption and emission from semiconductor CdSe/CdS quantum rods(QRs)provide extra benefits among other photoluminescence *** photo-induced alignment technique,the QRs can be oriented in liquid crystal polymer matrix at a large *** this article,a 2D Dammann grating pattern,within“SKL”characters domains aligned QRs in composite film,was fabricated by multi-step photo exposure using several photo masks,and a continuous geometric lens profile pattern aligned QRs was realized by the single step polarization converting holographic irradiation *** polarized optical microscope and fluorescence microscope are employed to determine the liquid crystal director profiles and QRs anisotropic excitation *** have been able to orient the QRs in fine binary and continuous patterns that confirms the strong quantum rod aligning ability of the proposed ***,the proposed approach paves a way for photoinduced flexible QRs alignments to provide a highly specific and difficult-to-replicate security application at a large scale.

关键词： quantum rods photo alignment liquid crystal flexible alignment polarized emission

Enhancing crystal integrity and structural rigidity of CsPbBr_(3) nanoplatelets to achieve a narrow colorsaturated blue emission

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Light(Science & Applications) 2024年第5期13卷 985-997页

作者： Qianqian Huang Wenxu Yin Bo Gao Qingsen Zeng Dong Yao Hao Zhang Yinghe Zhao Weijia Zheng Jiaqi Zhang Xuyong Yang Xiaoyu Zhang andrey L.rogach Key Laboratory of Automobile Materials MOE School of Materials Science&Engineeringand Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchunChina. State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchunChina. State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanHubeiChina. Department of Chemistry University of VictoriaVictoriaBCCanada. Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghaiChina. Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong S.A.RChina

Quantum-confined CsPbBr_(3) perovskites are promising blue emitters for ultra-high-definition displays,but their soft lattice caused by highly ionic nature has a limited ***,we endow CsPbBr_(3) nanoplatelets(NPLs)with atomic crystal-like structural rigidity through proper surface engineering,by using strongly bound N-dodecylbenzene sulfonic acid(DBSA).A stable,rigid crystal structure,as well as uniform,orderly-arranged surface of these NPLs is achieved by optimizing intermediate reaction stage,by switching from molecular clusters to mono-octahedra,while interaction with DBSA resulted in formation of a Cs_(x)O monolayer shell capping the NPL *** a result,both structural and optical stability of the CsPbBr3 NPLs is enhanced by strong covalent bonding of DBSA,which inhibits undesired phase transitions and decomposition of the perovskite phase potentially caused by ligand ***,rather small amount of DBSA ligands at the NPL surface results in a short inter-NPL spacing in their closely-packed films,which facilitates efficient charge injection and *** photoluminescence of the produced CsPbBr_(3) NPLs is bright(nearly unity emission quantum yield)and peaks at 457 nm with an extremely narrow bandwidth of 3.7 nm at 80 K,while the bandwidth of the electroluminescence(peaked at 460 nm)also reaches a record-narrow value of 15 nm at room *** value corresponds to the CIE coordinates of(0.141,0.062),which meets Rec.2020 standards for ultra-high-definition displays.

关键词： temperature stability narrow