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Photocatalyst with Chloroplast-like Structure for Enhancing Hydrogen Evolution Reaction

Energy & Environmental Materials 2022年第4期5卷 1229-1237页

作者： Fei Zhao Nan Zhang Hao Li Xiaochen Zhang zhengtang luo Yuhua Wang National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou UniversityLanzhou 730000China Department of Materials Science School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China Department of Chemical and Biomolecular Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China

Photosynthesis with the chloroplast works efficiently because of the envelope structure that serves to carry enzymes and to simultaneously maintain the spatial separation of photosynthesis and cellular respiration.Inspired by the spatially separated architecture,a chloroplast-like structured photocatalyst(PdS@CdS@MoS_(2)),in which the PdS and MoS_(2) function as enzymes in the chloroplast and CdS shell functions as the chloroplast envelope,was developed to improve the photocatalytic H_(2) evolution.In this unique nanoscale bionic structure,the poriferous CdS shell enhances light absorption,generates photoinduced carriers,and separates oxidation and reduction reactions.Meanwhile,PdS and MoS_(2) dual cocatalysts enhance the charge separation efficiency through forming a built-in electric field with CdS.We demonstrate that the separation efficiency of carriers,carrier lifetime,and the yield of H_(2) are both higher than that of CdS nanoparticles,evidencing the feasibility of the chloroplast-like structure in enhancing the photocatalyst activity.This work emphasizes the synergism of the three key processes of the photocatalytic reaction by simulating the chloroplast structure and provides a general synthesis strategy,the synthesis of novel structured for photocatalysts for diverse applications in the energy field.

关键词： chloroplast-like structure co-catalysts DFT calculations photocatalytic H_(2)evolution spatial separation of carriers

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Electrically controlled mRNA delivery using a polypyrrolegraphene oxide hybrid film to promote osteogenic differentiation of human mesenchymal stem cells

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Nano Research 2022年第10期15卷 9253-9263页

作者： Huijung Kim Kübra Solak Yoojoong Han Yeon-Woo Cho Kyeong-Mo Koo Chang-Dae Kim zhengtang luo Hyungbin Son Hyung-Ryong Kim Ahmet Mavi Tae-Hyung Kim School of Integrative Engineering Chung-Ang University84 Heukseuk-roDongjak-guSeoul 06974Republic of Korea Department of Nanoscience and Nanoengineering Graduate School of Natural and Applied SciencesAtatürk UniversityErzurum 25240Turkey Department of Chemical and Biological Engineering Hong Kong University of Science and TechnologyKowloonHong Kong 999077China Department of Pharmacology College of DentistryJeonbuk National UniversityJeonju 54896Republic of Korea Department of Nanoscience and Nanoengineering Institute of ScienceAtatürk UniversityErzurum 25240Turkey Department of Mathematics and Science Education Education Faculty of Kazım KarabekirAtatürk UniversityErzurum 25240Turkey

Direct messenger ribonucleic acid(mRNA)delivery to target cells or tissues has revolutionized the field of biotechnology.However,the applicability of regenerative medicine is limited by the technical difficulties of various mRNA-loaded nanocarriers.Herein,we report a new conductive hybrid film that could guide osteogenic differentiation of human adipose-derived mesenchymal stem cells(hADMSCs)via electrically controlled mRNA delivery.To find optimal electrical conductivity and mRNAloading capacity,the polypyrrole-graphene oxide(PPy-GO)hybrid film was electropolymerized on indium tin oxide substrates.We found that the fluorescein sodium salt,a molecule partially mimicking the physical and chemical properties of mRNAs,can be effectively absorbed and released by electrical stimulation(ES).The hADMSCs cultivated on the PPy-GO hybrid film loaded with pre-osteogenic mRNAs showed the highest osteogenic differentiation under electrical stimulation.This platform can load various types of RNAs thus highly promising as a new nucleic acid delivery tool for the development of stem cell-based therapeutics.

关键词： messenger ribonucleic acid(mRNA)delivery polypyrrole graphene oxide electrical release mesenchymal stem cells

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Graphene foam/hydrogel scaffolds for regeneration of peripheral nerve using ADSCs in a diabetic mouse model

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Nano Research 2022年第4期15卷 3434-3445页

作者： Qun Huang Yuting Cai Xinrui Yang Weimin Li Hongji Pu Zhenjing Liu Hongwei Liu Mohsen Tamtaji Feng Xu Liyuan Sheng Tae-Hyung Kim Shiqing Zhao Dazhi Sun Jinbao Qin zhengtang luo Xinwu Lu Department of Vascular Surgery Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Vascular Center of Shanghai Jiao Tong University Shanghai 200011China Department of Chemical and Biological Engineering and William Mong Institute of Nano Science and Technologythe Hong Kong University of Science and TechnologyHong Kong 999077China Bioinspired Engineering and Biomechanics Center(BEBC) the Key Laboratory of Biomedical Information Engineering of Ministry of EducationSchool of Life Science and TechnologyXi'an Jiaotong UniversityXi'an 710049China Shenzhen Institute Peking UniversityShenzhen 518057China School of Integrative Engineering Chung-Ang UniversitySeoul 06974Republic of Korea School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200030China

The functional recovery of peripheral nerve injury(PNI)is unsatisfactory,whereas diabetes mellitus(DM)and its related complications further attenuate the restoration of diabetic PNI(DPNI).Adipose-derived stem cells(ADSCs)are promising candidates for treatment of DPNI due to their abundant source,excellent differentiation and paracrine ability.Our results showed that ADSCs remarkably enhanced the proliferation and migration of Schwann cells and endothelial cells,and tube formation.Mechanistically,ADSCs could regulate Nrf2/HO-1,NF-κB and PI3K/AKT/mTOR signaling pathways,showing multiple functions in reducing oxidative stress and inflammation,and regulating cell metabolism,growth,survival,proliferation,angiogenesis,differentiation of Schwann cell and myelin formation.In current study,novel graphene foam(GF)/hydrogel-based scaffold was developed to deliver ADSCs for treatment of DPNI.GF/hydrogel scaffold exhibited excellent mechanical strength,suitable porous network,superior electrical conductivity,and good biocompatibility.In vitro results revealed that GF/hydrogel scaffold could obviously accelerate proliferation of Schwann cells.Moreover,in vivo experiments demonstrated that ADSCs-loaded GF/hydrogel scaffold significantly promoted the recovery of DPNI and inhibited the atrophy of targeted muscles,thus providing a novel and attractive therapeutic approach for DPNI patients.

关键词： peripheral nerve injury(PNI) diabetes mellitus(DM) adipose-derived stem cells(ADSCs) graphene hydrogel scaffold

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Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO_(2) single crystals

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Fundamental Research 2022年第3期2卷 456-461页

作者： Meng Ran Chao Zhao Xiang Xu Xiao Kong Younghee Lee Wenjun Cui Zhi-Yi Hu Alexander Roxas zhengtang luo Huiqiao Li Feng Ding Lin Gan Tianyou Zhai State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Centre for Multidimensional Carbon Materials Institute for Basic ScienceSchool of Materials Science and EngineeringUlsan National Institute of Science and TechnologyUlsanSouth Korea Center for Integrated Nanostructure Physics Institute for Basic ScienceSungkyunkwan UniversitySuwonSouth Korea State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CentreWuhan University of TechnologyWuhan 430074China Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

In-plane anisotropy(IPA)due to asymmetry in lattice structures provides an additional parameter for the precise tuning of characteristic polarization-dependent properties in two-dimensional(2D)materials,but the narrow range within which such method can modulate properties hinders significant development of related devices.Herein we present a novel periodic phase engineering strategy that can remarkably enhance the intrinsic IPA obtainable from minor variations in asymmetric structures.By introducing alternant monoclinic and rutile phases in 2D VO_(2)single crystals through the regulation of interfacial thermal strain,the IPA in electrical conductivity can be reversibly modulated in a range spanning two orders of magnitude,reaching an unprecedented IPA of 113.Such an intriguing local phase engineering in 2D materials can be well depicted and predicted by a theoretical model consisting of phase transformation,thermal expansion,and friction force at the interface,creating a frame-work applicable to other 2D materials.Ultimately,the considerable adjustability and reversibility of the presented strategy provide opportunities for future polarization-dependent photoelectric and optoelectronic devices.

关键词： Periodic phase engineering Two-dimensional VO_(2) Interfacial strain In-plane anisotropy Electrical anisotropy Chemical vapor deposition

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Synthesis of hexagonal boron nitrides by chemical vapor deposition and their use as single photon emitters

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Nano Materials Science 2021年第3期3卷 291-312页

作者： Hongwei Liu Chae Young You Jingwei Li Patrick Ryan Galligan Jiawen You Zhenjing Liu Yuting Cai zhengtang luo Department of Chemical and Biological Engineering the Hong Kong University of Science and TechnologyClear Water BayKowloon999077Hong Kong

Two-dimensional(2D)hexagonal boron nitride(hBN),due to its extraordinary thermal,chemical,and optical properties,has arisen as an enticing material for the research community to explore for various applications,including the use of site defects in hBN as single photon emitters(SPEs).In this review,we systematically summarize recent advanced strategies towards the controllable synthesis of 2D hBN using chemical vapor deposition,towards a full control of the domain size,orientation,morphology,layer number,and stacking order,etc.Moreover,we review the underlying mechanisms for single photon emission(SPE)in hBN and methods to selectively generate and tune the SPEs.Defects(e.g.,carbon substituted defects)are discussed for the potential use as emission sites.We finally give an outlook of future challenges and opportunities on desirable hBN synthesis and further investigation of SPEs in hBN,targeting to utilize hBN as single photon emitters in an industrial scale.

关键词： hBN CVD Controllable synthesis Single photon emission

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Evolution of the Raman spectrum of graphene grown on copper upon oxidation of the substrate

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Nano Research 2014年第11期7卷 1613-1622页

作者： XiuliYin Yilei Li Fen Ke Chenfang Lin Huabo Zhao Lin Gan zhengtang luo Ruguang Zhao Tony F. Heinz Zonghai Hu State Key Laboratory for Artificial Microstructures and Mesoscopic Physics School of Physics Peking University Beijing 100871 China Collaborative Innovation Center for Quantum Matter Beijing China Departments of Physics and Electrical Engineering Columbia University New York NY 10027 USA Department of Chemical and Biomolecular Engineering Hang Kong University of Science and Technology Kowloon Hang Kong China

在在一部铜电影上种的单个层的 graphene 的拉曼光谱的重要变化在发生在周围的条件下面的内在的底层的自发的氧化以后被观察。graphene G 和 2D 拉曼模式的频率被发现经历红移动，当二个乐队的紧张由超过一个数量级变化时。为了理解这... 详细信息

在在一部铜电影上种的单个层的 graphene 的拉曼光谱的重要变化在发生在周围的条件下面的内在的底层的自发的氧化以后被观察。graphene G 和 2D 拉曼模式的频率被发现经历红移动，当二个乐队的紧张由超过一个数量级变化时。为了理解这些的起源，完成，我们进一步由扫描通道描绘了样品显微镜学(STM ) ，扫描通道光谱学(圣) ，和原子力量显微镜学(AFM ) 。没有破坏 graphene overlayer 的水晶的顺序或改变做水平的搬运人，底层的氧化在底层生产了可估计的折皱。我们以 graphene 层的折皱导致的张力的紧张解释拉曼频率的红移动。在有氧化的拉曼紧张的变化从对在散布过程的拉曼结合 graphene 层的光的效率的薄亚铜的氧化物电影的影响产生。

关键词：氧化石墨拉曼光谱生长扫描隧道显微镜演化铜基原子力显微镜氧化亚铜薄膜

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Enhancement of MoTe2 near-infrared absorption with gold hollow nanorods for photodetection

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Nano Research 2020年第6期13卷 1636-1643页

作者： Jiawen You Ye Yu Kai Cai Dongming Zhou Haiming Zhu Renyan Wang Qingfu Zhang Hongwei Liu Yuting Cai Dong Lu Jang-Kyo Kim Lin Gan Tianyou Zhai zhengtang luo Department of Chemical and Biological Engineering William Mong Institute of Nano Science and Technology and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Straße 6Dresden01069Germany State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Chemistry Zhejiang UniversityHangzhou310027China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen518000China Guangzhou HKUST Fok Ying Tung Research Institute Guangzhou511458China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Infrared(IR)light photodetection based on two dimensional(2D)materials of proper bandgap has attracted increasing attention.However,the weak IR absorption in 2D materials,due to their ultrathin attribute and indirect bandgap in multilayer structures,degrades their performance when used as IR photodetectors.In this work,we utilize the fact that few-layer MoTe2 flake has a near-IR(NIR)bandgap and demonstrate a^60-fold enhancement of NIR response by introducing a gold hollow nanorods on the surface.Such gold hollow nanorods have distinct absorption peak located also at the NIR regime,therefore induces strong resonance,benefitting NIR absorption in MoTe2,resulting in strong near-field enhancement.With the evidence from steady and transient state optical spectra,we confirm that the enhancement of NIR response originates only photon absorption,rather than electron transport at interfaces as observed in other heterostructures,therefore,precluding the requirement of high-quality interfaces for commercial applications.

关键词： NIR photodetection LSPR MoTe2 gold hollow nanorods

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Scalable and ultrafast epitaxial growth of single-crystal graphene wafers for electrically tunable liquid-crystal microlens arrays

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Science Bulletin 2019年第10期64卷 659-668页

作者： Bing Deng Zhaowei Xin Ruiwen Xue Shishu Zhang Xiaozhi Xu Jing Gao Jilin Tang Yue Qi Yani Wang Yan Zhao Luzhao Sun Huihui Wang Kaihui Liu Mark H. Rummeli Lu-Tao Weng zhengtang luo Lianming Tong Xinyu Zhang Changsheng Xie Zhongfan Liu Hailin Peng Center for Nanochemistry (CNC) Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Beijing Graphene Institute (BCl) Beijing 100094 China Wuhan National Laboratory for Optoelectronics School of Automation National Key Laboratory of Science and Technology on Multispectral Information Processing Huazhong University of Science & Technology Wuhan 430074 China Department of Chemical and Biological Engineering Materials Characterization and Preparation Facility The Hong Kong University of Science and Technology Hong Kong 999077 China State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing 100871 China Institute of Functional Nano and Soft Materials (FUNSOM) J iangsu Key Laboratory for Carbon-Based Functional Materials and Devices and Joint International Research Laboratory of Carbon-Based Functional Materials and Devices Soochow University Suzhou 215123 China Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province College of Energy Soochow Institute for Energy and Materials Innovations Soochow University Suzhou 215006 China Centre of Polymer and Carbon Materials Polish Academy of Sciences Zabrze 41-819 Poland Wuhan National Laboratory for Optoelectronics Huazhong University of Science & Technology Wuhan 430074 China

The scalable growth of wafer-sized single-crystal graphene in an energy-efficient manner and compatible with wafer process is critical for the killer applications of graphene in high-performance electronics and optoelectronics. Here, ultrafast epitaxial growth of single-crystal graphene wafers is realized on singlecrystal Cu90Ni10(1 1 1) thin films fabricated by a tailored two-step magnetron sputtering and recrystallization process. The minor nickel(Ni) content greatly enhances the catalytic activity of Cu, rendering the growth of a 4 in. single-crystal monolayer graphene wafer in 10 min on Cu90Ni10(1 1 1), 50 folds faster than graphene growth on Cu(1 1 1). Through the carbon isotope labeling experiments, graphene growth on Cu90Ni10(1 1 1) is proved to be exclusively surface-reaction dominated, which is ascribed to the Cu surface enrichment in the Cu Ni alloy, as indicated by element in-depth profile. One of the best benefits of our protocol is the compatibility with wafer process and excellent scalability. A pilot-scale chemical vapor deposition(CVD) system is designed and built for the mass production of single-crystal graphene wafers, with productivity of 25 pieces in one process cycle. Furthermore, we demonstrate the application of single-crystal graphene in electrically controlled liquid-crystal microlens arrays(LCMLA), which exhibit highly tunable focal lengths near 2 mm under small driving voltages. By integration of the graphene based LCMLA and a CMOS sensor, a prototype camera is proposed that is available for simultaneous light-field and light intensity imaging. The single-crystal graphene wafers could hold great promising for highperformance electronics and optoelectronics that are compatible with wafer process.

关键词： Graphene Ultrafast growth CuNi(1 1 1)thin film Single crystal wafer Liquid crystal microlens arrays

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Effects of substrate and transfer on CVD-grown graphene over sapphire-induced Cu films

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Science China Chemistry 2014年第6期57卷 895-901页

作者： HU BaoShan WEI ZiDong AGO Hiroki JIN Yan XIA MeiRong luo zhengtang PAN QingJiang LIU YunLing School of Chemistry and Chemical Engineering Chongqing University Institute for Materials Chemistry and Engineering Kyushu University Department of Chemical and Biomolecular Engineering Hongkong University of Science and Technology Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationHeilongjiang University State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin University

We differentiated the effects of Cu films deposited on single crystalline a-,r-,and c-plane sapphire substrates upon graphene films synthesized with atmospheric pressure chemical vapor deposition(CVD).The data illustrate that the realization of high-crystalline Cu film is dependent not only on the crystallinity of underlying substrate,but also on the symmetric match of crystallographic geometry between metal film and substrate.We also systematically investigated the effects of PMMA removal on the Raman ID/IG and IG/I2D values of transferred graphene.The results reveal that different PMMA removal methods do not alter the ID/IG values;instead,the residue of PMMA increases the IG/I2D values and the thermal decomposition of PMMA leads to higher IG/I2D values than the removal of PMMA with acetone.The effects of PMMA removal on variations of the Raman spectra are also discussed.

关键词：蓝宝石衬底 CVD 石墨聚甲基丙烯酸甲酯 PMMA 铜膜生长转让

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聚合物纳米粒子乳液的制备及性能研究——添加组分对乳胶粒子形态及胶膜吸水率的影响

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离子交换与吸附 2001年第1期17卷 70-77页

作者：侯有军任力罗正汤曾繁森华南理工大学材料学院!广州 510641

本文采用种子微乳液聚合方法，经后期氨化反应，合成了聚丙烯酸酯纳米粒子乳液。讨论了乳化剂、缓冲剂和水溶性丙烯酸单体等添加组分对乳胶粒子形态和胶膜吸水率的影响，并探讨了微乳液聚合的反应机理。

关键词：纳米粒子乳液聚合种子微乳液聚合氨化反应

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