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Chemical Research in Chinese Universities 2024年第4期40卷 657-663页

作者： ZHU Lixun LIU Dan WU Kaiwen XIE guohua ZHAO Zheng TANG Ben Zhong School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Shenzhen518172P.R.China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyHongkong999077P.R.China The Institute of Flexible Electronics(Future technologies) Xiamen UniversityXiamen361005P.R.China

Developing easily accessible deep-red/near-infrared circularly polarized emitters for practical organic light-emitting diodes remains a significant ***,a practical strategy has been proposed for developing deep-red circularly polarized delayed fluorescent emitters based on a novel chiral acceptor *** changing triphenylamine(TPA)substitution position from para to meta,R/S-M-TBBTCN demonstrated thermally activated delayed fluorescence(TADF)properties with a delayed lifetime of 6.6µs that R/S-P-TBBTCN doesn’t ***,R/S-M-TBBTCN showed a 65 nm red-shift in emission and a 10-fold enhancement in asymmetry factor(glum),compared with R/*** solution-processed nondoped circularly polarized organic light-emitting diodes(CP-OLEDs)based on R-M-TBBTCN display deep-red emission and 2.2%external quantum efficiency.

关键词： Amplified chirality Deep-red circularly polarized organic light emitting-diode Binaphthol based chiral acceptor

Mold-free self-assembled scalable microlens arrays with ultrasmooth surface and record-high resolution

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Light(Science & Applications) 2023年第7期12卷 1318-1326页

作者： Zhihao Liu Guangwei Hu Huapeng Ye Miaoyang Wei Zhenghao Guo Kexu Chen Chen Liu Biao Tang Guofu Zhou Guangdong Provincial Key Laboratory of Optical Information Materials and technology&Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China National Center for International Research on Green optoelectronics South China Normal UniversityGuangzhou 510006China School of Electrical and Electronic Engineering 50 Nanyang AvenueNanyang Technological UniversitySingapore 639798Singapore shenzhen guohua optoelectronics tech.co.ltd Shenzhen 518110China

Microlens arrays(MLAs)based on the selective wetting have opened new avenues for developing compact and miniaturized imaging and display techniques with ultrahigh resolution beyond the traditional bulky and volumetric ***,the selective wetting lenses explored so far have been constrained by the lack of precisely defined pattern for highly controllable wettability contrast,thus limiting the available droplet curvature and numerical aperture,which is a major challenge towards the practical high-performance *** we report a mold-free and self-assembly approach of mass-production of scalable MLAs,which can also have ultrasmooth surface,ultrahigh resolution,and the large tuning range of the *** selective surface modification based on tunable oxygen plasma can facilitate the precise pattern with adjusted chemical contrast,thus creating large-scale microdroplets array with controlled *** numerical aperture of the MLAs can be up to 0.26 and precisely tuned by adjusting the modification intensity or the droplet *** fabricated MLAs have high-quality surface with subnanometer roughness and allow for record-high resolution imaging up to equivalently 10,328 ppi,as we *** study shows a cost-effective roadmap for mass-production of high-performance MLAs,which may find applications in the rapid proliferating integral imaging industry and high-resolution display.

关键词： record pattern precise

Photoelectric-driven conductive composite ionogel patch for effective wound healing

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eScience 2024年第2期4卷 92-100页

作者： Xingkai Ju Jiao Kong guohua Qi Shuping Hou Bo Wang Xingkang Diao Shaojun Dong Yongdong Jin State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Guangdong Key Laboratory of Biomedical Measurements and Ultrasound Imaging School of Biomedical EngineeringShenzhen University Medical SchoolShenzhen UniversityShenzhen 518060China

Developing the high biosafety,effective and wearable devices for fast wound healing is highly desired but remains a ***,we propose a“win–win co-operation”strategy to potentiate effective skin wound healing at the wound site by constructing robust and ecofriendly composite patch under opto-electric *** wearable patch is composed of ionic gel doped with Ti3C2Tx(MXene),which possesses good photothermal response to kill the bacteria via effective inhibition of the expression of inflammatory factors,preventing wound ***,the composite ionogel patch is capable of providing green and on-demand electrical stimulation for wound site,guiding cell migration and proliferation by improved bioenergy and expression up-regulation of growth *** mice wound models,the treatment group healed~31%more ***,the wearable devices could enable visual and real-time supervising treatment effect due to their good *** proposed strategy would be promising for future clinical treatment of wound healing.

关键词： Wound healing Wearable composite ionogel patch Antibacteria Electrical stimulation Cell migration and proliferation

The colored Oil Property Effect on Switching Behavior of Electro-Fluidic Display

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Materials Sciences and Applications 2020年第2期11卷 167-176页

作者： Yuanyuan Guo Yong Deng Biao Tang Alex Henzen Guofu Zhou Guangdong Provincial Key Laboratory of Optical Information Materials and technology & Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou China shenzhen guohua optoelectronics tech. co. ltd. Shenzhen China Academy of shenzhen guohua optoelectronics Shenzhen China

The switchable oil layer driven by electrowetting gives visible color and light valve control, which is the basis of Electro-Fluidic Displays. The colored oil’s property is a key factor that influences the Electro-Fluidic Displays switching behavior. A purple oil was formulated by the oil-soluble purple dye in decane in this study. The dye molecule itself is nonpolar and it doesn’t dissolve in water. The concentration of colored oil influenced the oil/water interfacial tension and oil viscosity. The relationship of EFD switching behavior with oil/water interfacial tension, oil viscosity, and oil conductivity has been systematically investigated. The oil/water interfacial tension decreased with increasing oil concentration, in the meanwhile, the conductivity increased. Oil conductivity was one of the key factors that influenced the Electro-Fluidic Displays optical property. We found for the first time that at the lower oil concentration (2% - 10%), the interfacial tension plays a main role effect on the rupture voltage and response time, but as the conductivity of higher concentration of colored oil increased (at 20%), the rupture voltage-controlled both by conductivity and interfacial tension.

关键词： Electro Fluid Display Device Oil/Water Interfacial Tension/Viscosity/conductivity Rupture Voltage Opening Ratio

Inter-facet composition modulation of III-nitride nanowires over pyramid textured Si substrates by stationary molecular beam epitaxy

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Nano Research 2021年第5期14卷 1502-1511页

作者： Peng Wang Hedong Chen Hao Wang Dan Wang Changkun Song Xingyu Wang Hongjie Yin Lujia Rao Guofu Zhou Richard Nötzel Guangdong Provincial Key Laboratory of Optical Information Materials and technology South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China National Center for International Research on Green optoelectronics South China Normal UniversityGuangzhou510006China Department of Physics Xiamen UniversityXiamen361005China Analysis&Testing Center South China Normal UniversityGuangzhou510631China Academy of shenzhen guohua optoelectronics Shenzhen518110China

InGaN nanowires (NWs) are grown on pyramid textured Si substrates by stationary plasma-assisted molecular beam epitaxy (PA-MBE). The incidence angles of the highly directional source beams vary for different pyramid facets, inducing a distinct inter-facet modulation of the In content of the InGaN NWs, which is verified by spatial element distribution analysis. The resulting multi-wavelength emission is confirmed by photoluminescence (PL) and cathodoluminescence (CL). Pure GaN phase formation dominates on certain facets, which is attributed to extreme local growth conditions, such as low active N flux. On the same facets, InGaN NWs exhibit a morphology change close to the pyramid ridge, indicating inter-facet atom migration. This cross-talk effect due to inter-facet atom migration is verified by a decrease of the inter-facet In content modulation amplitude with shrinking pyramid size. A detailed analysis of the In content variation across individual pyramid facets and element distribution line profiles reveals that the cross-talk effect originates mainly from the inter-facet atom migration over the convex pyramid ridge facet boundaries rather than the concave base line facet boundaries. This is understood by first-principles calculations showing that the pyramid baseline facet boundary acts as an energy barrier for atom migration, which is much higher than that of the ridge facet boundary. The influence of the growth temperature on the inter-facet In content modulation is also presented. This work gives deep insight into the composition modulation for the realization of multi-color light-emitting devices based on the monolithic growth of InGaN NWs on pyramid textured Si substrates.

关键词： pyramid textured Si substrate composition modulation III-nitride nanowire molecular beam epitaxy stationary growth cross talk

Photocatalytic one-step synthesis of Ag nanoparticles without reducing agent and their catalytic redox performance supported on carbon

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Journal of Energy Chemistry 2019年第9期28卷 37-46页

作者： Lingling Shui Guoxiu Zhang Bin Hu Xingxing Chen Mingliang Jin Guofu Zhou Nan Li Martin Muhler Baoxiang Peng Guangdong Provincial Key Laboratory of Optical Information Materials and technology&Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 Guangdong China Laboratory of Industrial Chemistry Ruhr-University BochumD-44780 Bochum Germany School of Chemical Engineering University of Science and Technology LiaoningAnshan 114051 Liaoning China shenzhen guohua optoelectronics tech.co.ltd Shenzhen 518110 Guangdong China Academy of shenzhen guohua optoelectronics Shenzhen 518110 Guangdong China Max Planck Institute for Chemical Energy conversion D-45470 Miilheim an der Ruhr Germany

Synthesis of silver nanoparticles(Ag NPs) with state-of-the-art chemical or photo-reduction methods generally takes several steps and requires both reducing agents and stabilizers to obtain NPs with narrow size ***, we report a novel method to synthesize Ag NPs rapidly in one step, achieving typical particle sizes in the range from 5 to 15 *** synthesis steps only involve three chemicals without any reducing agent: AgNO3 as precursor, polyvinylpyrrolidone(PVP) as stabilizer, and AgCl as *** Ag NPs were supported on carbon and showed excellent performance in thermal catalytic pnitrophenol reduction and nitrobenzene hydrogenation, and as electrocatalyst for the oxygen reduction reaction.

关键词： Silver Carbon Photoreduction Hydrogenation Oxygen reduction reaction

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A modular approach to efficient thermally activated delayed fluorescence from metal-perturbed intraligand charge-transfer excited state of Au(I) complexes

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Science China Chemistry 2024年

作者： Jian-Gong Yang Xingyu Feng guohua Xie Nengquan Li Jiayu Li Xiu-Fang Song Ming-De Li Jingling Zhang Xiaoyong Chang Kai Li shenzhen Key Laboratory of New Information Display and Storage Materials Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Materials Science and Engineering Shenzhen University Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing Department of Chemistry and Chemical EngineeringWuhan Textile University The Institute of Flexible Electronics (Future technologies) Xiamen University Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province Department of ChemistryShantou University Department of Chemistry Southern University of Science and Technology

The efficient harvesting of triplet excitons is crucial to the realization of high-performance organic light-emitting diodes（OLEDs）.Herein,we show that coordination of donor-acceptor （D-A） type molecules to a metal atom in a monodentate fashion can lead to thermally activated delayed fluorescence （TADF） emissions with wide color tunability only through varying the noncoordinating acceptor moiety.A panel of TADF gold（I） complexes with emission maxima (λmax) of 545–645 nm from metal perturbed intraligand charge-transfer （MPICT） excited states have been *** effects of heavy atom-induced spin-orbit coupling （SOC）,steric-induced donor-acceptor twisting and suppressed intramolecular motions lead to high emission efficiencies of 65%?85% in doped films with delayed fluorescence lifetime of as short as 2.0μ*** absorption spectroscopic studies on selected complexes determined the kISCto be 6.5×10～*** calculations confirmed the participation of minor d orbital into the lowest excited state,which led to an SOC value of 5.19 cm-1between the lowest-lying singlet and triplet excited *** yellow to deep red solution-processed OLEDs based on the new gold（I） complexes incorporated with various D-A ligands demonstrated promising *** study validates a modular design for TADF metal complexes,which will broaden the choices of metal centers and allow for facile color tuning via simple ligand synthesis.

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Cell thickness dependence of electrically tunable infrared reflectors based on polymer stabilized cholesteric liquid crystals

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Science China Materials 2018年第5期61卷 745-751页

作者： Xiaowen Hu Laurens T. de Haan Hitesh Khandelwal Albertus P.H.J. Schenning Li Nian Guofu Zhou SCNU-TUE Joint Laboratory of Device Integrated Responsive Materials （DIRM） National Center for International Research on Green Optoelectronics South China Normal University No 378 West Waihuan Road Guangzhou Higher Education Mega Center Guangzhou 510006 China Laboratory of Functional Organic Materials ＆ Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology P. O. Box 513 5600 MB Eindhoven The Netherlands Institute of Electronic Paper Displays and Guangdong Provincial Key Laboratory of Optical Information Materials and technology South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China shenzhen guohua optoelectronics tech. co. ltd. Shenzhen 518110 China

We reported here the fabrication of the elec- trically tunable infrared （IR） reflectors based on the polymer stabilized cholesteric liquid crystal （PSCLC） with negative dielectric anisotropy. A systematic study of the influence of cell gap on the electrically tunable reflection bandwidth was performed. When a direct current （DC） electric field was ap- plied, the reflection bandwidth red shifted in the cells with small cell gap, whereas the bandwidth broadening was ob- served in the cells with large cell gap. It is therefore reasonable to deduct that the reflection is dictated by the pitch gradient steepness which strongly relies on the cell thickness. The re- sults reveal that for making PSCLC based IR reflector windows with electrically induced bandwidth broadening, a minimal cell gap thickness is required. The resulted IR reflectors pos- sess a short native switching time and long-term operation stability, and are potentially applicable as smart energy saving windows in buildings and automobiles.

关键词： cholesteric cell gap polymer network electric reg-ulating infrared reflector

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Exfoliation of bulk 2H-MoS_(2)into bilayer 1T-phase nanosheets via ether-induced superlattices

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Nano Research 2024年第6期17卷 5705-5711页

作者： Xiuling Shi Dongmei Lin Zhuorui Xiao Yibo Weng Hanxiang Zhou Xiaoying Long Zhiyu Ding Fuyuan Liang Yan Huang guohua Chen Kaikai Li Tong-Yi Zhang School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHong KongChina School of Energy and Environment City University of Hong KongTat Chee AvenueKowloonHong KongChina The Hong Kong University of Science and technology(Guangzhou) Guangzhou Municipal Key Laboratory of Materials InformaticsAdvanced Materials Thrust and Sustainable Energy and Environment ThrustNanshaGuangzhou 511400China

The exfoliation of bulk 2H-molybdenum disulfide(2H-MoS_(2))into few-layer nanosheets with 1T-phase and controlled layers represents a daunting challenge towards the device applications of MoS_(2).conventional ion intercalation assisted exfoliation needs the use of hazardous n-butyllithium and/or elaborate control of the intercalation potential to avoid the decomposition of the MoS_(2).This work reports a facile strategy by intercalating Li ions electrochemically with ether-based electrolyte into the van der Waals(vdW)channels of MoS_(2),which successfully avoids the decomposition of MoS_(2)at low *** co-intercalation of Li+and the ether solvent into MoS_(2)makes a first-order phase transformation,forming a superlattice phase,which preserves the layered structure and hence enables the exfoliation of bulk 2H-MoS_(2)into bilayer nanosheets with *** with the pristine 2H-MoS_(2),the bilayer 1T-MoS_(2)nanosheets exhibit better electrocatalytic performance for the hydrogen evolution reaction(HER).This facile method should be easily extended to the exfoliation of various transition metal dichalcogenides(TMDs).

关键词： exfoliation of MoS_(2) phase transformations superlattices ether electrolyte hydrogen evolution reaction(HER)

commercially Viable Hybrid Li-Ion/Metal Batteries with High Energy Density Realized by Symbiotic Anode and Prelithiated Cathode

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Nano-Micro Letters 2022年第9期14卷 174-186页

作者： Kui Lin Xiaofu Xu Xianying Qin Ming Liu Liang Zhao Zijin Yang Qi Liu Yonghuang Ye guohua Chen Feiyu Kang Baohua Li shenzhen Key Laboratory on Power Battery Safety Research and shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolShenzhen 518055People’s Republic of China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084People’s Republic of China contemporary Amperex technology co.ltd. Ningde 352100People’s Republic of China shenzhen Graphene Innovation Center co.ltd. Shenzhen 518055People’s Republic of China college of Materials Science and Engineering Hunan UniversityChangsha 410082People’s Republic of China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077People’s Republic of China

The energy density of commercial lithium(Li)ion batteries with graphite anode is reaching the *** is believed that directly utilizing Li metal as anode without a host could enhance the battery’s energy density to the maximum ***,the poor reversibility and infinite volume change of Li metal hinder the realistic implementation of Li metal in battery ***,a commercially viable hybrid Li-ion/metal battery is realized by a coordinated strategy of symbiotic anode and prelithiated *** be specific,a scalable template-removal method is developed to fabricate the porous graphite layer(PGL),which acts as a symbiotic host for Li ion intercalation and subsequent Li metal deposition due to the enhanced lithiophilicity and sufficient ion-conducting pathways.A continuous dissolution-deintercalation mechanism during delithiation process further ensures the elimination of dead *** a result,when the excess plating Li reaches 30%,the PGL could deliver an ultrahigh average coulombic efficiency of 99.5% for 180 cycles with a capacity of 2.48 m Ah cm^(-2) in traditional carbonate ***,an air-stable recrystallized lithium oxalate with high specific capacity(514.3 m Ah g^(-1))and moderate operating potential(4.7-5.0 V)is introduced as a sacrificial cathode to compensate the initial loss and provide Li source for subsequent *** on the prelithiated cathode and initial Li-free symbiotic anode,under a practical-level3 m Ah capacity,the assembled hybrid Li-ion/metal full cell with a P/N ratio(capacity ratio of Li Ni_(0.8)co_(0.1)Mn_(0.1)O_(2) to graphite)of 1.3exhibits significantly improved capacity retention after 300 cycles,indicating its great potential for high-energy-density Li batteries.

关键词： Hybrid lithium-ion/metal battery Symbiotic anode Porous graphite layer Cathode prelithiation Lithium oxalate

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