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纳米研究（英文版）
纳米研究（英文版）

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纳米研究（英文版）/Journal Nano ResearchCSCDCSTPCD北大核心EISCI
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    Synthesis of covalent organic framework materials and their application in the field of sensing

    Weiyu ZhangShiwei LiuQihua SunNing Tian...
    162-195页
    查看更多>>摘要：Covalent organic frameworks(COFs)are an emerging type of porous crystalline polymers formed by combining strong covalent bonds with organic building blocks.Due to their large surface area,high intrinsic pore space,good crystallization properties,high stability,and designability of the resultant units,COFs are widely studied and used in the fields of gas adsorption,drug transport,energy storage,photoelectric catalysis,electrochemistry,and sensors.In recent years,the rapid development of the Internet of Things and people's yearning for a better life have put forward higher and more requirements for sensors,which are the core components of the Internet of Things.Therefore,this paper reviews the recent progress of COFs in synthesis methods and sensing applications,especially in the last five years.This paper first introduces structure,properties,and synthesis methods of COFs and discusses advantages and disadvantages of different synthesis methods.Then,the research progress of COFs in different sensing fields,such as metal ion sensors,gas sensors,biomedical sensors,humidity sensors,and pH sensors,is introduced systematically.Conclusions and prospects are also presented in order to provide a reference for researchers concerned with COFs and sensors.
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    Micro/nanoelectrode-based electrochemical methodology for single cell and organelle analysis

    Chuchu XuDe YangYuchan WangRuolin Liu...
    196-206页
    查看更多>>摘要：Cells are the basic unit of life.Electrochemical analysis of single cells/organelles is essential for uncovering the molecular mechanisms of physiological and pathological processes that are difficult to elucidate on a larger scale.This paper provides an overview of the commonly used fabrication methods for micro/nanoelectrodes applied in the investigations of single cells/organelles as well as the corresponding electrochemical measurements over the last four years including extracellular measurement,combination of extra and intracellular measurement,intracellular reactive oxygen species and reactive nitrogen species(ROS/RNS)measurement,and isolated organelles measurement.
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    A confined growth strategy to construct 3DOM SiO2 nanoreactor in-situ embedded Co3O4 nanoparticles catalyst for the catalytic combustion of VOCs:Superior H2O and SO2 resistance

    Weigao HanShilin WuFang DongWeiliang Han...
    207-220页
    查看更多>>摘要：SO2 poisoning is a common problem in the catalytic combustion of volatile organic compounds(VOCs).In this work,we took three-dimensionally ordered macroporous and mesoporous(3DOM)SiO2 as the nanoreactor to protect active sites from SO2 erosion in the catalytic combustion of benzene.Simultaneously,the confined growth of metal active nanoparticles in the multi-stage pore is also full of challenges.And we successfully confined Co3O4 nanoparticles(NPs)in macroporous and mesoporous channels.Interestingly,the precursors'growth in the pore was controlled and nanoreactors with different pore sizes were prepared by adjusting the loading amount and preparation methods.It is discovered that the Co3O4 NPs confined in 3DOM SiO2 nanoreactor showed superior sulfur and water resistance.Density functional theory(DFT)calculations verified that the Co-Si catalyst had high SO2 adsorption energy(-0.48 eV),which illustrated that SO2 was hard to attach to the surface of the Co-Si catalyst.The SiO2 nanoreactor had low SO2 adsorption energy(-5.15 eV),which indicated that SO2 was easily absorbed on SiO2 nanoreactor.This illustrated that the SiO2 nanoreactor could protect effectively active sites from SO2 erosion.
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    Optimal geometrical configuration and oxidation state of cobalt cations in spinel oxides to promote the performance of Li-O2 battery

    Yu ZhangShuting ZhangMengwei YuanYufeng Li...
    221-227页
    查看更多>>摘要：Co3O4 is considered as one of promising cathode catalysts for lithium oxygen(Li-O2)batteries,which contains both tetrahedral Co2+sites(Co2+Td)and octahedral Co3+sites(Co3+Oh).It is important to reveal the effect of optimal geometric configuration and oxidation state of cobalt ion in Co3O4 to improve the performance of Li-O2 batteries.Herein,through regulating the synthesis process,Co2+and Co3+sites in Co3O4 were replaced with Zn and Al atoms to form materials with a unique Co site.The Li-O2 batteries based on ZnCo2O4 showed longer cycle life than that of CoAl2O4,suggesting that in Co3O4,the Co3+Oh site is a relatively better geometric configuration than Co2+Td site for Li-O2 batteries.Theoretical calculations revealed that Co3+oh sites provide higher catalysis activity,regulating the adsorption energy of the intermediate LiO2 and accelerating the kinetics of the reaction in batteries,which further leads to the change of the morphology of the discharge product and ultimately improves the electrochemical performance of the batteries.
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    Interfacial oxidized Pd species dominate catalytic hydrogenation of polar unsaturated bonds

    Pengyao YouShaoqi ZhanPengpeng RuanRuixuan Qin...
    228-234页
    查看更多>>摘要：The determination of catalytically active sites is crucial for the design of efficient and stable catalysts toward desired reactions.However,the complexity of supported noble metal catalysts has led to controversy over the locations of catalytically active sites(e.g.,metal,support,and metal/support interface).Here we develop a structurally controllable catalyst system(Pd/SBA-15)to reveal the catalytic active sites for the selective hydrogenation of ketones to alcohol using acetophenone hydrogenation as model reaction.Systematic investigations demonstrated that unsupported Pd nanocrystals have no catalytic activity for acetophenone hydrogenation.However,oxidized Pd species were catalytically highly active for acetophenone hydrogenation.The catalytic activity decreased with the decreased oxidation state of Pd.This work provides insights into the hydrogenation mechanism of ketones but also other unsaturated compounds containing polar bonds,e.g.,nitrobenzene,N-benzylidene-benzylamine,and carbon dioxide.
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    Boosting sodium-storage properties of hierarchical Na3V2(PO4)3@C micro-flower cathodes by tiny Cr doping:The effect of"four ounces moving a thousand pounds"

    Yongjia WangGuoshuai SuXiaoying LiLinrui Hou...
    235-244页
    查看更多>>摘要：Na3V2(PO4)3(NVP),as a great potential cathode candidate for Na-ion batteries(NIBs),has attracted enormous interest due to its three-dimensional(3D)large open framework for convenient Na+transport,yet its practical application is still limited by its inferior electron conductivity and sluggish Na+diffusion kinetics.Herein,the tiny Cr doped hierarchical NVP micro-flower cathodes(i.e.,Na3V2-xCrx(PO4)3@C,x ≤ 0.1),which are self-assembled with single-crystal nanoflake subunits in-situ coated with carbon nano-shell,are designed and fabricated via a scalable avenue.The optimized cathode,i.e.,Na3V1.94Cr0.06(PO4)3@C(NVCP-6),was endowed with more electro-active Na(2)sites and higher electronic/ionic conductivity for efficient sodium storage.Benefiting from these competitive merits,the NVCP-6,when evaluated as a cathode towards NIBs,exhibits an ultrahigh-rate capability of 99.8 mAh·g-1 at 200 C and superior stability of 82.2％over 7300 cycles at 50 C.Furthermore,the NVCP-6 based full NIBs display remarkable electrochemical properties in terms of both high-rate capacities and long-duration cycling properties at different temperatures(-20-50 ℃).The contribution,i.e.,the design of"four ounces can move a thousand pounds",here will promote the practical industrial application of NVP towards advanced NIBs.
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    In situ tracking of the lithiation and sodiation process of disodium terephthalate as anodes for rechargeable batteries by Raman spectroscopy

    Xiu-Mei LinChong HanXin-Tao YangJia-Sheng Lin...
    245-252页
    查看更多>>摘要：Organic compounds represent an appealing group of electrode materials for rechargeable batteries due to their merits of biomass,sustainability,environmental friendliness,and processability.Disodium terephthalate(Na2C8H4O4,Na2TP),an organic salt with a theoretical capacity of 255 mAh·g-1,is electroactive towards both lithium and sodium.However,its electrochemical energy storage(EES)process has not been directly observed via in situ characterization techniques and the underlying mechanisms are still under debate.Herein,in situ Raman spectroscopy was employed to track the de/lithiation and de/sodiation processes of Na2TP.The appearance and then disappearance of the-COOLi Raman band at 1625 cm-1 during the de/lithiation,and the increase and then decrease of the-COONa Raman band at 1615 cm-1 during the de/sodiation processes of Na2TP elucidate the one-step with the 2Li+or 2Na+transfer mechanism.We also found that the inferior cycling stability of Na2TP as an anode for sodium-ion batteries(SIBs)than lithium-ion batteries(LIBs)could be due to the larger ion radium of Na+than Li+,which results in larger steric resistance and polarization during EES.The Na2TP,therefore,shows greater changes in spectra during de/sodiation than de/lithiation.We expect that our findings could provide a reference for the rational design of organic compounds for EES.
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    Cobalt-doped TiO2@C hierarchical nanocomposites derived from Ti3C2 MXene as cathodes for hybrid magnesium-lithium batteries

    Xiaohui LiYakun TangLang LiuYue Zhang...
    253-261页
    查看更多>>摘要：TiO2 has been explored in hybrid magnesium-lithium batteries(HMLBs)due to the advantages of low self-discharge and small volume expansion during ion insertion.However,how to improve the inherently low ionic and electrical conductivity of TiO2 is the problem that needs to be solved.In this work,a smart strategy is adopted to prepare cobalt-doped TiO2@C(Co4+-TiO2@C)hierarchical nanocomposite derived from Co(Ⅱ)(OH)n@Ti3C2.Compared with TiO2@C(without cobalt doping),Co4+-TiO2@C shows the highest specific capacity(154.7 mAh·g-1 at 0.1 A·g-1 after 200 cycles)and extraordinary rate performance in HMLBs.The excellent electrochemical performance of Co4+-TiO2@C is ascribed to the synergistic effect of the hierarchical structure and cobalt-doping.Both experimental results and density functional theory(DFT)calculation reveal that the cobalt-doping has effectively improved the electronic conductivity and reduced the Li4 migration barrier.This work provides a new insight to design TiO2-based cathode materials with high-performance in HMLBs.
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    Real-time identification of multiple nanoclusters with a protein nanopore in single-cluster level

    Ling ZhangPeilei HeHuang ChenQingda Liu...
    262-269页
    查看更多>>摘要：It is important and challenging to analyze nanocluster structure with atomic precision.Herein,α-hemolysin nanopore was used to identify nanoclusters at the single molecule level by providing two-dimensional(2D)dwell time-current blockage spectra and translocation event frequency which sensitively depended on their structures.Nanoclusters such as Anderson,Keggin,Dawson,and a few lacunary Dawson polyoxometalates with very similar structures,even with only a two-atom difference,could be discriminated.This nanopore device could simultaneously measure multiple nanoclusters in a mixture qualitatively and quantitatively.Furthermore,molecular dynamics(MD)simulations provided microscopic understandings of the nanocluster translocation dynamics and yielded 2D dwell time-current blockage spectra in close agreement with experiments.The nanopore platform provides a novel powerful tool for nanocluster characterization.
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    Pd@Ir-LOD multienzyme utilizing endogenous lactate consumption cooperates with photothermal for tumor therapy

    Zichen YeYun LiJingchao LiXinyan Hu...
    270-281页
    查看更多>>摘要：Lactic acid(LA)plays a major role in the occurrence,development,and spread of cancer.Enlightened by its high accumulation in tumor site,a novel lactate oxidase(LOD)conjugated two-dimensional Pd@lr nanoplatform(Pd@lr-LOD,PIL)was fabricated to combine cascade reaction with photothermal for tumor therapy.In detail,the overexpressed LA in tumor microenvironment(TME)was a key factor to activate the PIL-based cascade reaction:(1)Plenty of H2O2 could be generated from LA by the catalysis of LOD with O2;(2)potent·OH was produced from H2O2 due to the peroxidase(POD)-like activity of PIL;(3)meantime,PIL's catalase(CAT)-like activity could decompose part H2O2 into O2 to achieve the purpose of LA cyclic oxidization.Moreover,the reduced glutathione(GSH)scavenging capability of PIL might protect the produced reactive oxygen species(ROS)from being cleared to further improve the cascade therapeutic effect.More importantly,PIL had excellent photothermal conversion efficiency(37.35％)and manifested a surprising temperature rising effect in tumor.Taken together,the decreasing LA concentration,accumulation of high-toxic ROS,the depletion of GSH together with the higher intra-tumoral temperature potently enhanced in vivo antitumor therapy.Therefore,a promising therapeutic tactic based on PIL integrating endogenous LA consumption,chemodynamic therapy(CDT),and photothermal therapy(PTT)has been put forward.
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