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Dynamic photoelectrical regulation of ECM protein and cellular behaviors

Bioactive Materials 2023年第4期22卷 168-179页

作者： Xiaozhao Wang Cai Yao Xudong Yao Junxin Lin Rui Li Kun Huang Weiming Lin Xiaojun Long Chao Dai Jiajun Dong Xuegong Yu a Wenwen Huang Wenjian Weng Qi Wang Hongwei Ouyang Kui Cheng School of Materials Science and Engineering State Key Laboratory of Silicon MaterialsCyrus Tang Center for Sensor Materials and ApplicationsZhejiang UniversityHangzhou310027China Dr.Li Dak Sum&Yip Yio Chin Center for Stem Cells and Regenerative Medicine Department of Orthopedic Surgery of the Second Affiliated HospitalZhejiang University School of MedicineHangzhou310058China Department of Sports Medicine Zhejiang University School of MedicineHangzhou310058China Zhejiang University-University of Edinburgh Institute Zhejiang University School of MedicineKey Laboratory of Tissue Engineering and Regenerative Medicine of Zhejiang ProvinceZhejiang University School of MedicineHangzhou314400China China Orthopedic Regenerative Medicine Group(CORMed) Hangzhou310058China School of Chemistry Zhejiang UniversityHangzhou310027China International Institutes of Medicine The Fourth Affiliated HospitalZhejiang University School of MedicineNo.N1Shangcheng AvenueYiwu322000China

Dynamic regulation of cell-extracellular matrix(ECM)-material interactions is crucial for various biomedical applications.In this study,a light-activated molecular switch for the modulation of cell attachment/detachment behaviors was established on monolayer graphene(Gr)/n-type Silicon substrates(Gr/Si).Initiated by light illumination at the Gr/Si interface,pre-adsorbed proteins(bovine serum albumin,ECM proteins collagen-1,and fibronectin)underwent protonation to achieve negative charge transfer to Gr films(n-doping)throughπ-πinteractions.This n-doping process stimulated the conformational switches of ECM proteins.The structural alterations in these ECM interactors significantly reduced the specificity of the cell surface receptor-ligand interaction(e.g.,integrin recognition),leading to dynamic regulation of cell adhesion and eventual cell detachment.RnA-sequencing results revealed that the detached bone marrow mesenchymal stromal cell sheets from the Gr/Si system manifested regulated immunoregulatory properties and enhanced osteogenic differentiation,implying their potential application in bone tissue regeneration.This work not only provides a fast and feasible method for controllable cells/cell sheets harvesting but also gives new insights into the understanding of cell-ECM-material communications.

关键词： Graphene Protein conformational change Charge transfer Cell-materials interaction n-doping

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Grain Size and n-doping Effects on Mechanical Response of Ultrananocrystalline Diamond Film Under Shear Loading

Grain Size and N-Doping Effects on Mechanical Response of Ul...

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The second Asia-Pacific International Conference on Computational Methods in Engineering（ICOME2006）

作者： Luming Shen1 Zhen Chen2 1 Department of Civil Engineering Monash University Clayton Campus Victoria 3800 Australia 2 Department of Civil and Environmental Engineering University of Missouri-Columbia Columbia MO 65211-2200 USA

Due to the lack of thorough understanding of the ultrananocrystalline diamond （UnCD） growth mechanism, a simple procedure is proposed to form a polycrystalline UnCD block with an artificial grain boundary （GB）. The mechanical responses of the resulting UnCD films with various grain sizes are investigated by applying displacement–controlled shear loading in the molecular dynamics simulations. By randomly adding different numbers of nitrogen （n） atoms into the GBs of these polycrystalline UnCD films, the effects of n atom number density and GB width on the mechanical properties of UnCD are also studied. It appears that the initial shear moduli of pure and n-doped UnCD films are size-insensitive, although their shear strengths decrease with the specimen size. The initial shear modulus of n-doped UnCD is insensitive to the GB width, while the shear strength decreases with both the n atom number density and the GB width.

关键词： Ultrananocrystalline Diamond Molecular Dynamics n-doping Size Effect Mechanical Properties.

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A new Approach for Heavy <i>n</i>-doping Process in Ge Epilayers Using Specific Solid Source

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Optics and Photonics Journal 2018年第2期8卷 11-19页

作者： Luong Thi Kim Phuong Hong Duc University Thanh Hoa City Viet Nam

As an indirect band gap material, Germanium (Ge) has low efficiency of radiative recombination in the wavelength area of about 1550 nm. However, the difference between the direct and indirect band gap is very small (~140 meV) and photoluminescence emission ability of Ge could be greatly enhanced by heavy n-doping process. In this work, Ge growth directly on Si (001) substrate by molecular beam epitaxial (MBE) technique and a high n-doping level in Ge was obtained owning to using GaP decomposition source. The GaP solid source produces P2 molecules instead of P4 molecules, which have higher sticking coefficient than that of P4 comparing to the traditional doping method from PH3 gas precursor molecules. The dependence of optical property on Ge film thickness is also studied. The out-diffusion phenomenon of phosphorus dopant has been observed through SIMS profile analysis. An activated phosphorus concentration can be achieved up to more than 2 × 1019 atoms?cm&minus3 confirmed by Hall effect measurement. This result contributes to realization of Ge-on-Si devices for optoelectronic applications.

关键词： Germanium Heavy n-doping GaP Source Photoluminescence Optoelectronic Applications

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Biomass-derived bifunctional electrocatalysts for oxygen reduction and evolution reaction: A review

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Journal of Energy Chemistry 2022年第2期31卷 149-172页

作者： Satpal Singh Sekhon Jaeyoung Lee Jin-Soo Park Future Environment and Energy Research Institute Sangmyung UniversityCheonan 31066Republic of Korea Department of Physics Guru Nanak Dev UniversityAmritsar 143005India Ertl Center for Electrochemistry and Catalysis Gwangju Institute of Science and Technology123 Cheomdangwagi-roBuk-guGwangju 61005Republic of Korea Department of Green Chemical Engineering College of EngineeringSangmyung UniversityCheonan 31066Republic of Korea

Oxygen electrode catalysts are important as inter-conversion of O_(2) and H_(2)O is crucial for energy technologies.However,the sluggish kinetics of oxygen reduction and evolution reactions(ORR and OER)are a hindrance to their scalable production,whereas scarce and costly Pt and Ir/Ru-based catalysts with the highest electrocatalytic activity are commercially unviable.Since good ORR catalysts are not always efficient for OER and vice versa,so bifunctional catalysts on which OER and ORR occurs on the same electrode are very desirable.Alternative catalysts based on heteroatom-doped carbon nanomaterials,though showed good electrocatalytic activity yet their high cost and complex synthesis is not viable for scalable production.To overcome these drawbacks,biomass-derived heteroatom-doped porous carbons have recently emerged as low-cost,earth-abundant,renewable and sustainable environment-friendly materials for bifunctional oxygen catalysts.The tunable morphology,mesoporous structure and high concentration of catalytic active sites of these materials due to heteroatom(n)-doping could further enhance their ORR and OER activity,along with tolerance to methanol crossover and good durability.Thus,biomassderived heteroatom-doped porous carbons with large surface area,rich edge defects,numerous micropores and thin 2 D nanoarchitecture could be suitable as efficient bifunctional oxygen catalysts.In the present article,synthesis,n-doping,ORR/OER mechanism and electrocatalytic performance of biomassderived bifunctional catalysts has been discussed.The selected biomass(chitin,eggs,euonymus japonicas,tobacco,lysine and plant residue)except wood,act as both C and n precursor,resulting in n selfdoping of porous carbons that avoids the use of toxic chemicals,thus making the synthesis a facile and environment-friendly green process.The synthetic strategy could be further optimized to develop future biomass-based n self-doped porous carbons as metal-free high performance bifunctional oxygen catalysts for commercial energy applications

关键词： Bifunctional catalysts Biomass ORR OER n-doping Porous carbons

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Agar-derived nitrogen-doped porous carbon as anode for construction of cost-effective lithium-ion batteries

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中国化学快报:英文版 2023年第8期34卷 370-375页

作者： Tong Wang Jingquan Sha Wenwen Wang Yuhan Ji Zhi-Ming Zhang Institute for new Energy Materials&Low Carbon Technologies School of Chemistry and Chemical EngineeringTianjin University of TechnologyTianjin 300384China School of Chemistry Chemical Engineering and MaterialsJining UniversityQufu 273100China

Balancing cost and performance of porous carbon(PC)as anode for lithium-ion battery(LIBs)is the key to effectively promote commercial application.Herein,low-cost n-doped PC(nPC-Ts,T=600,750 and 900°C)were facilely prepared in batches via one-pot pyrolysis of agar with different carbonization temperature.The nPC-750 with specific surface area of 2914 m^(2)/g and n content of 2.84%exhibits an ultrahigh reversible capacity of 1019 mAh/g at 0.1 A/g after 100 cycles and 837 mAh/g at 1 A/g after 500 cycles.Remarkably,the resulting LIBs exhibit an ultrafast charge-discharge feature with a remarkable capacity of 281 mAh/g at 10 A/g and a superlong cycle life with a capacity retention of 87%after 5000 cycles at 10 A/g.Coupling with LiFePO_(4)cathode,the fabricated lithium-ion full cells possess high capacity,excellent rate and cycling performances(125 mAh/g at 100 mA/g,capacity retention of 95%,after 220 cycles),highlighting the practicability of this nPC-750 as the anode materials.

关键词： Agar Porous carbon n-doping Anode Lithium-ion battery

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Acceptor-acceptor-type Organoboron Conjugated Polymers:Effect of Backbone Configuration on Thermoelectric Performance

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Chinese Journal of Polymer Science 2023年第1期41卷 108-116页

作者： Chang-Shuai Dong Bin Meng Jun Liu Li-Xiang Wang State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China University of Science and Technology of China Hefei230026China

The development of n-type polymer thermoelectrics lags far behind that of p-type ones in view of material diversity and performance.new structural insights into the thermoelectric performance are needed for efficient n-type polymer thermoelectric materials.Herein,we developed three acceptor-acceptor type organoboron polymers and investigated the effect of backbone configuration on thermoelectric performance.The three polymers are designed based on double B←n bridged bipyridine(BnBP)unit with monomeric thieno[3,4-c]pyrrole-4,6-dione(TPD),TPD dimer and TPD trimer as the copolymerizing units,respectively.The three polymers show similar low LUMO energy levels but different backbone configuration.Compared with the wavy backbone configuration,the pseudo-straight backbone configuration imparts the polymer with much enhanced crystallinity and electron mobility.As a result,after n-doping,the polymer with pseudo-straight configuration shows much higher electronic conductivity and power factor.We think these findings could serve as important guidelines for molecular design toward efficient n-type polymer thermoelectric materials.

关键词： Organoboron polymers Acceptor-acceptor type conjugated polymers n-Type polymer thermoelectrics n-doping

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Toward stable photoelectrochemical water splitting using niOOH coated hierarchical nitrogen-doped ZnO-Si nanowires photoanodes

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Journal of Energy Chemistry 2022年第8期31卷 45-55,I0002页

作者： Indrajit V.Bagal Maheswari Arunachalam Ameer Abdullah Aadil Waseem Mandar AKulkarni Soon Hyung Kang Sang-Wan Ryu Department of Physics Chonnam National UniversityGwangju 61186Republic of Korea Department of Chemistry Education Chonnam National UniversityGwangju 61186Republic of Korea Optoelectronic Convergence Research Center Chonnam National UniversityGwangju 61186Republic of Korea

Photoelectrochemical(PEC)water splitting is regarded as the most promising method to generate“green hydrogen”,and zinc oxide(ZnO)has been identified as one of the promising candidates for PEC water splitting owing to its straddling band alignment with the water redox level.However,its PEC performance is limited due to its wide bandgap and anticipated by photocorrosion in an aqueous medium.In this work,we present strategic improvements in the PEC water splitting performance of ZnO nanowires(nWs)by nitrogen(n)-doping along with photostability by the core–shell deposition of a niOOH cocatalyst.Highly crystalline hierarchical ZnO nWs were fabricated on Si nWs(ZnO-Si HnWs)using a metal organic chemical vapor deposition approach.The nWs were then n-doped by annealing in an nH_(3) atmosphere.The n-doped ZnO-Si HnWs(n:ZnO-Si HnWs)showed enhanced visible light absorption,and suppressed recombination of the photogenerated carriers.As compared to ZnO-Si HnWs(0.045 m A cm^(-2) at 1.23 V vs RHE),the n:ZnO-Si HnWs(0.34 m A cm^(-2) at 1.23 V vs RHE)annealed in nH^(3) ambient for 3 h at 600℃showed 7.5-fold enhancement in the photocurrent density.niOOH-deposited n:ZnO-Si HnW photoanodes with a photostability of 82.21%over 20000 s showed 10.69-fold higher photocurrent density(0.48 m A cm^(-2) at 1.23 V vs RHE)than ZnO-Si HnWs.

关键词： Hierarchical nWs MOCVD niOOH cocatalyst n-doping Photoelectrochemical water splitting

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Facile solution-processed molybdenum oxide as hole transporting material for efficient organic solar cell

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Journal of Energy Chemistry 2022年第6期31卷 108-114,I0004页

作者： Qian Kang Chenyi Yang Bowei Xu Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesInstitute of Chemistry Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Chemical Resource Engineering College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

The large energy barrier in hole extraction still remains a great challenge in developing hole transporting layer (HTL) materials for organic solar cells (OSCs).Thus,solution-processed HTL materials with excellent hole collection ability and good compatibility with large-area processing technique are strongly desired for OSCs.Herein,we developed a cost-effective and solution-processed MoO_(3)HTL for efficient OSCs.By adding a small amount of glucose as reducing reagent into the ammonium molybdate precursor solution,a deeply n-doped MoO_(3),namely G:Mo,was prepared through the sol–gel method.Compared to pristine MoO_(3),the conductivity of G:Mo was enhanced by two orders of magnitude,which greatly improved the hole collection ability of the HTL.OSCs with G:Mo can exhibit comparable PCE to the PEDOT:PSS device.Using PBDB-TF:BTP-eC9 as the active layer,a PCE of 17.1%is obtained for the device,which is the highest PCE value for OSC using a solution-processed MoO_(3)HTL.More importantly,G:Mo is well compatible with the blade-coating processing.The OSC using a blade-coated G:Mo showed almost no PCE loss as compared to the device with spin-coated G:Mo HTL.The results from this work indicate that G:Mo is a promising HTL material for the practical production of OSCs.

关键词： Printable n-doping Molybdenum oxide High conductivities Anode interlayers

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Co_(2)n nanoparticles Anchored on n-Doped Active Carbon as Catalyst for Oxygen Reduction Reaction in Zinc–Air Battery

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Energy & Environmental Materials 2022年第3期5卷 935-943页

作者： Xianli Wu Guosheng Han Hao Wen Yanyan Liu Lei Han Xingyu Cui Jiajing Kou Baojun Li Jianchun Jiang Research Center of Green Catalysis College of ChemistryZhengzhou University100 Science RoadZhengzhou 450001China national Engineering Laboratory for Biomass Chemical Utilization Institute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjing 210042China College of Science Henan Agricultural UniversityZhengzhou 450002China Davidson School of Chemical Engineering Purdue University480 Stadium Mall DriveIN 47906United States State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University28 Xianning West RoadXi'an 710049China

The development of efficient catalytic electrode toward oxygen reduction reaction(ORR)is still a great challenge for the wide use of zinc–air batteries.Herein,Co_(2)n nanoparticles(nPs)anchored on n-doped carbon from cattail were verified with excellent catalytic performances for ORR.The onset and half-wave potentials over the optimal catalyst reach to 0.96 V and 0.84 V,respectively.Current retention rates of 96.8%after 22-h test and 98.8%after running 1600 s were obtained in 1 M methanol solution.Density functional theory simulation proposes an apparently increased electronic states of Co_(2)n in n-doped carbon layer close to the Fermi level.Higher charge density,favorable adsorption,and charge transfer of intermediates originate from the coexistence of Co_(2)n nPs and n atoms in carbon skeleton.The superior catalytic activity of composites also was confirmed in zinc–air batteries.This novel catalytic property and controllable preparation approach of Co_(2)ncarbon composites provide a promising avenue to fabricate metal-containing catalytically active carbon from biomass.

关键词： catalytically active carbon Co2n nanoparticles n-doping oxygen reduction reaction zinc–air battery

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High fill factor over 82%enabled by a biguanide doping electron transporting layer in planar perovskite solar cells

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Frontiers of Optoelectronics 2018年第4期11卷 360-366页

作者： Ru GE Fei QIn Lin HU Sixing XIOnG Yinhua ZHOU Wuhan national Laboratoly for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and Technology Wuhan 430074China

n-type doping in electron transport materials is an effective way to improve the electron collection and enhance the performance of the perovskite solar cells (PSCs). Here, for the first time, an antibiotic and antimicrobial compound of 1-(o-Tolyl) biguanide (oTb) is used to dope the electron transport material of phenyl-C61-butyric acid methyl ester (PCBM). The oTb doping into the PCBM can increase the conductivity and reduce the work function of the PCBM. The oTb doping can significantly enhance the fill factor (FF) of the perovskite solar cells with the structure of glass/ITO/niOx/MAPbI3/(oTb)PCBM/(PEIE)/Ag. For the cells without PEIE (polyethylenimine ethoxylated) coating, the oTb doping increases the FF from 0.57 to 0.73. S-shaped of the current density-voltage (J-V) characteristic under illumination is removed after the oTb doping. For the cells with PEIE coating between the (oTb)PCBM and Ag, the oTb doping increases the FF from 0.70 to 0.82. These results show the potential of the oTb as an n-dopant in the applications of perovskite solar cells.

关键词： perovskite solar cells n-doping biguanide fill factor (FF) electron transporting layer

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