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    20 October 2020, Volume 42 Issue Album-4
    Article
    Controllable Liquid Transfer for Preparing Oriented Polymer Thin Films: Toward the Enhanced Performance of PLED
    MENG Lili, CHEN Linlin, ZHANG Xiaoliang, XIE Linghai, LIU Huan
    2021, 42(Album-4):  1-8.  doi:10.7503/cjcu20200478
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    We demonstrated a facile solution process guided by the conical fibers array(CFA), based on which bulky polydiarylfluorene(PODPF) were oriented on substrate. After thermal annealing at ca. 240 ℃, PODPF changed from the amorphous-phase to compact π-π stacking β-phase, leading to a PODPF film with higher orientations and larger crystallized sizes. It is proposed that the CFA enables finely controlling the wetting and dewetting processes under directional stress, guiding the disorganized polymer transform into orientation. Using the as-prepared PODPF films as the active layer, a polymer light-emitting diodes(PLEDs) device was developed, which exhibited higher current efficiency of 1.53 cd/A(5.6 V) and more stable electroluminescence compared with that of the spin-coating one. We envision that the as-developed approach offers new inspiration for fabricating high-performance polymer films.

    Review
    Surface and Interface Chemistry in Flexible Electronics
    JI Shaobo, CHEN Xiaodong
    2021, 42(Album-4):  1-19.  doi:10.7503/cjcu20200644
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    Flexible electronics is an emerging research hotspot, which involves chemistry, physics, mate- rials, etc.. As an interdisciplinary topic, flexible electronics have been used in various fields, such as wea-rable devices, bio-medical applications, artificial intelligence. The fabrication of flexible devices requires the integration of different materials including flexible substrates, conductive materials, and functional components. Their integration is limited by their surface properties and interfacial interactions, their function and reliability are also influenced by the stability of their interfacial bindings. Thus surface and interface treatments, including chemical treatments, are important for fabrication and functionalization of flexible electronic devi-ces. In this review, the application of surface/interface chemistry in flexible electronics will be cataloged into 3 types. Firstly, electrochemical reactions on surface, which are the bases for flexible chemical sensors and can be used to control the loading/release of chemicals on device surfaces. Secondly, surface modification, which can improve the processability of materials by varying their surface properties, and endow the devices with specific properties, functions, or protections. Lastly, interfacial connections, which link different materials and layers through covalent bonding or chemical process assisted physical entanglement, to improve the stability of the whole device. Summary and examples for each type will be given, followed by discussion of existing problems, possible future developments, and application potentials.

    Improving the Detection Performance of Surface-assisted Laser Desorption/ionization Mass Spectrometry by Silicon Nanostructures
    DOU Shuzhen, WANG Zhongshun, LÜ Nan
    2021, 42(Album-4):  1-11.  doi:10.7503/cjcu20200506
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    Various technologies of constructing silicon nanostructures are summarized. Recent research progress on improving the performance of surface assisted laser desorption/ionization mass spectrometry(SALDI-MS) by silicon-based nanostructures is reviewed, and the functionalized silicon nanostructure surfaces to promote laser desorption/ionization(LDI) is prospected.

    Research Progress of Graphene-based Hemostatic Sponges
    DU Fanglin, WU Bingxin, LIU Jiao, XU Congcong, LI Guofeng, WANG Xing
    2021, 42(Album-4):  1-11.  doi:10.7503/cjcu20200496
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    Graphene-based sponge, constructed by two-dimensional carbon nanosheets, is a new type of trauma hemostatic material. It has features of hierarchical porous structures, ultrafast liquid absorption capacity, and versatile surface functionalization. Therefore, it has been used as a platform to achieve multifunctional composites, showing the great applications in the field of trauma hemostasis. This review summaries the research progress focusing on the applications and mechanism researches of graphene-based hemostatic sponges, and suggests its prospects for its development.

    Advances in Lithium Metal Batteries Based on Surface Interface Reaction and Optimization
    WANG Zengqiang, SUN Yiling, QIAN Zhengfang, WANG Renheng
    2021, 42(Album-4):  1-14.  doi:10.7503/cjcu20200508
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    Lithium(Li) metal has high theoretical specific capacity, a low reduction potential, so is one of the ideal materials for the anode of lithium batteries. During the long-term cycling, however, lithium metal has problems such as interface deterioration and serious energy loss due to lithium dendrites growing. The optimization of interface reaction between lithium metal electrodes and electrolytes is a significant research direction. In the paper, the hazards caused by lithium dendrites was outlined, as well as comprehensively reviewing methods adopted to solve this problem from analysis and inhibition of lithium dendritic deposition, including the formation and protection mechanisms of solid electrolyte interface, surface modification, three-dimensio-nal lithium anode, liquid/solid electrolytes, etc. Besides, the advantages and disadvantages of methods above are summarized, and research prospects to lithium metal batteries is expected in the energy field simultaneously.

    Article
    Preparation of Carboxyl-betaine Polyurethane Hydrogel and Study on Its Underwater Anti-crude-oil-adhesion Property
    WANG Aqiang, ZHU Yuzhang, JIN Jian
    2021, 42(Album-4):  1-7.  doi:10.7503/cjcu20200697
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    Quaternary ammonium ionic diol was synthesized by nucleophilic substitution reaction between ethyl 4-bromobutyrate and N-Methyldiethanolamine. Then, polyurethane prepolymer was prepared via the polymerization of the quaternary ammonium ionic diol and hexamethylene diisocyanate(HDI) trimer. By the process of alkaline hydrolysis, carboxyl-betaine polyurethane hydrogel with different hydrolysis time was finally obtained. The result shows the underwater oil contact angles of hydrolyzing-for-60-min carboxyl-betaine polyurethane hydrogel for cetane, kerosene, petroleum ether, isooctane and even crude oil are all above 160° and the corresponding underwater oil-adhesion forces are all 0. Carboxyl-betaine polyurethane hydrogel with excellent underwater anti-crude-oil-adhesion was successfully prepared.

    Review
    Selenium-containing Surface/interface Chemistry
    XIA Jiahao, XU Huaping
    2021, 42(Album-4):  1-8.  doi:10.7503/cjcu20200572
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    Selenium is an essential element to human body. Our research group has recently revealed many unique features of selenium-containing bonds. For instance, diselenide bond has dual redox response, and it is also a type of dynamic bond which can undergo exchange reaction under visible light irradiation. Combing those interesting properties of selenium-containing bonds with surface/interface chemistry can endow system with unique responsive behaviors. This article reviews the recent progresses we made in the field of selenium-containing surface/interface chemistry. We used single molecule force spectroscopy to study the nature of selenium-containing bonds in the force point of view, and used interface chemistry to modulate the equilibrium of diselenide dynamic exchange reaction. Additionally, we achieved reversible surface modification, two- dimensional material functionalization and layer-by-layer nanocomposite film fabrication based on the redox and light response of diselenide bond, which may find potential applications in fields like biomedical research and liquid transfer.

    Research Progress of Metal-organic Frameworks in the Field of Chemical Separation and Analysis
    WANG Longjie, FAN Hongchuan, QIN Yu, CAO Qiue, ZHENG Liyan
    2021, 42(Album-4):  1-10.  doi:10.7503/cjcu20200494
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    Metal-organic frameworks(MOFs) are known as a class of porous materials which are formed by metal ions and organic ligands through coordination bonds. Extensive attentions have been attracted due to their large surface area, adjustable pores and controllable surface properties and so forth. The surface properties of MOFs can be regulated through selection of organic ligands and metal ions, as well as post-modification. Thus, many applications of MOFs were expanded in separation and analysis field according to improving selective adsorption, specific recognition and other properties. In this review, we focuse on the relationship between the surface properties and separation performance of MOFs, and summarize some relative works in separation and analysis field of MOFs in recent years, and look forward to the future research of MOFs.

    Article
    Carbon-doped Oxygen-deficient TiO2 Fibers Synthesized without Adding External Carbon Sources and Their Photocatalytic Activity
    ZHOU Shuai, WANG Juan
    2021, 42(Album-4):  1-8.  doi:10.7503/cjcu20200625
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    The carbon-doped oxygen-deficient TiO2(C-TiO2-n) fiber photocatalysts were prepared by sol-gel method combined with centrifugal spinning technology and heat treatment under steam. The structure, component and properties of the C-TiO2-n fibers as well as the effect of carbon doping on the photocatalytic activity of C-TiO2-n fibers were investigated. The results confirm that the introduction of carbon into TiO2 can be realized using the organic components in the fiber precursor as carbon sources without the introduction of external carbon sources. The introduction of carbon components effectively improved the light harvesting ability of photocatalysts and inhibited the recombination of photoinduced carriers. In the photocatalytic degradation experiment with azo dye reactive brilliant red(X-3B) as the target pollutant, C-TiO2-n fibers showed excellent photocatalytic activity and cycling stability. After visible light irradiation of 60 min, the degradation rate of X-3B over C-TiO2-n fibers reached 96.99%, and the kinetic constant was 0.0556 min-1, 19.86 times higher than that of TiO2-n fibers.

    Review
    Status and Prospect of Surface Wettability of Molecular Self-assembled Monolayers
    MA Zhuoyuan, WANG Dayang
    2021, 42(Album-4):  1-12.  doi:10.7503/cjcu20200620
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    This article aims to revisit the research of surface wetting on self-assembled monolayers(SAMs) of organic molecules. It starts with a brief overview of the growth mechanism governing the self-assembly of organic molecules, followed by discussion of temperature-induced phase transition of SAMs. In the following sections, the surface wettability of SAMs is discussed in three main aspects on the basis of a collection of studies reported in a time span of 100 years, including (1) the contribution of terminal methyl groups to total surface energy of SAMs; (2) manifestation of the interactions between terminal polar groups and their interactions with water in SAM surface wettability, and the newly-discovered effect of molecular-level roughness of SAMs on their surface wettability. These studies will be put in new prospective in order to shift conventional thermodynamic description of surface wetting phenomena to new molecular-level interpretation and design of surface wettability.

    Recent Development on Surface-interface Chemistry of All-solid-state Lithium Batteries
    ZOU Junyan, ZHANG Yanyan, CHEN Shi, SHAO Huaiyu, TANG Yuxin
    2021, 42(Album-4):  1-12.  doi:10.7503/cjcu20200643
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    Owing to the potential safety hazards such as electrolyte leakage and flammability of traditional lithium batteries, nonflammable all-solid-state electrolytes are considered to be ideal electrolyte candidates for lithium batteries. However, how to effectively reduce the interface resistance between the solid-state electrolyte and the electrode is the key to the development of all-solid-state lithium batteries. In this article, we review the research progress in surface modification of all-solid-state lithium battery electrodes and electrolytes. The classic methods of improving the interface contact and reducing the interface resistance are also discussed. Based on the traditional methods, new surface modification technologies will provide new ideas for improving the performance of all-solid-state lithium batteries in the future.

    Research Progress of Noble Metal⁃based Nanozymes
    CAI Rui, LIU Jianbo, WU Xiaochun
    2021, 42(Album-4):  1-14.  doi:10.7503/cjcu20200591
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    Noble metal nanomaterials are a kind of special nanomaterials with unique optical, electrical, and catalytic properties. The noble metal-based nanozymes are a new research frontier of noble metal nanomaterials in biomedical field. Noble metal-based nanozymes possess good stability, controllable enzyme-like activity, multiple enzyme-like activities, and excellent biocompatibility and hold great potential in biomedical applications. In this review, we summarized the enzyme mimic types, enzyme catalytic mechanisms, activity regulation, and potential biomedical applications of noble metal-based nanozymes.

    Application of Conductive Polymer in Nerve Interface Electrode
    FAN Wenqian, ZHONG Zhengxiang, TIAN Gongwei, WANG Yu, GONG Guifen, QI Dianpeng
    2021, 42(Album-4):  1-10.  doi:10.7503/cjcu20200583
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    As a medium of information communication between human body and external devices, neural interface electrode provides an effective tool for people to further explore the working mechanism of nervous system. Most of the traditional nerve electrodes are made from metal or semiconductor materials. These materials have become the main preparation materials of early nerve electrode because of their inert material characteristics and excellent electrical conductivity. However, due to the mechanical mismatch caused by excessive rigidity and smooth surface, and the high electrochemical impedance with biological tissues, these materials limit the further development of nerve electrode. As an organic conductive material, conductive polymer has the characteristics of softness(Young’s modulus is about 0.01—10 GPa) and conductivity(the conductivity of highly doped conductive polymer is in the metal range of 100—105 S/cm), which is an effective material for nerve electrode preparation. In recent years, conductive polymers have been used to modify or even replace the traditional electrode materials to reduce the interface impedance and improve the sensitivity of electrode detection; At the same time, it can increase the stability of electrode implanted in vivo for a long time by reducing the strain mismatch between the electrode and tissue, the inflammatory reaction, and further introducing functional biomacromolecules into the conductive polymer to reduce the rejection of biological tissue to the electrode. In this paper, we will discuss and summarize the application of conductive polymer materials in neural electrode. Herein, three aspects of conducting polymer, including polymer coating nerve electrode, all polymer neural electrode and conductive polymer composite material neural electrode, are discussed respectively. The application prospect and existing problems of conductive polymer in neural interface electrode are analyzed, which can provide reference for the further development of neural interface electrode in brain science, bioelectronic medicine and other frontier fields.

    Research Progress in Droplet Deposition on Superhydrophobic Plant Leaves
    CUI Yingtao, WANG Shun, LI Wei, CUI Shumin, HUANG Yanjie, LI He, DUAN Hu, SONG Meirong, DONG Zhichao, WANG Yilin, JIANG Lei
    2021, 42(Album-4):  1-13.  doi:10.7503/cjcu20200621
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    Ubiquitous superhydrophobic plant leaves in nature can easily cause great losses for impinging agrochemical droplets via bouncing and splashing. So, increasing the efficiency of droplet deposition is crucially significant to improve pesticide utilization. Based on the progress scientists have made on enhancing droplet deposition, this paper starts from the analysis of the impact kinetic characteristics of water droplets on the superhydrophobic surface, takes the physical and chemical properties of the droplets after the additives into consideration, systematically summarizes the method and mechanism of the deposition of water droplets on the leaves of superhydrophobic plants. In addition, we conclude that screening additives and exploring mechanisms should consider not only the properties of the additives but also the substrate structure and impact dynamics characteristics. Finally, we propose that future research should focus on the influence of single droplet size, substrate motion and elasticity, and environmental factors on deposition. This work plays significant role not only in pesticide spraying but also in many other fields such as biomedicine, mechanical engineering, coating spraying, ink printing and so on.

    Article
    Intelligent Controllable Microreactor Based on Superhydrophilic Nanochannel
    WANG Can, WANG Dianyu, MIAO Weining, TIAN Ye
    2021, 42(Album-4):  1-8.  doi:10.7503/cjcu20200650
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    The anodic alumina oxide(AAO) porous membrane was treated with low-temperature air plasma to obtain superhydrophilic nanochannels. An oil-soluble ferrofluid was introduced on the AAO membrane, and an intelligent and controllable microreactor was constructed by adjusting the direction and strength of the external magnetic field. The intelligent microreactor has the characteristics of multilevel gating, high current-gating ratio, and long-term cycle stability. It was used in homogeneous and heterogeneous reactions and characterized by fluorescence spectrophotometer and scanning electron microscope. The results showed that the reaction products have different yields and structures under different gated states, and have good application prospects in the controllable reaction of microreactors.

    Break of Metal-organic Chains Induced by 4,4′-Dihydroxybiphenyl on Surfaces
    XU Zhichao, LI Xuechao, TANG Yanning, ZHANG Haiming, CHI Lifeng
    2021, 42(Album-4):  1-5.  doi:10.7503/cjcu20200661
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    Metal-organic hybrid structures are common intermediates in on-surface reactions. To break metal-organic bonds of the hybrid structures needs to overcome a higher activation barrier, which often leads to a series of competitive side reactions and even desorption of target products. Scanning tunneling microscope(STM) has been used to show that the oxygen terminal of 4,4′-dihydroxybiphenyl can effectively reduce the bond breaking barrier of the metal-organic hybridization system, so that the transfer of metal-organic hybrids can be carried out at a lower temperature. This result provides a new method to regulate the intermediates of on-surface reactions.

    Density Functional Theoritical Studies on the Promising Electrocatalyst of M-BHT(M=Co or Cu) for CO2 Reduction to CH4
    YANG Tao, YAO Huiying, LI Qing, HAO Wei, CHI Lifeng, ZHU Jia
    2021, 42(Album-4):  1-8.  doi:10.7503/cjcu20200729
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    Two-dimensional metal organic frame materials show excellent electrocatalytic activity for CO2 reduction reaction because of their unique electronic structures and abundant catalytic sites. Herein, based on density functional theory calculations, we found that monolayer Co-BHT(BHT=benzenehexathiol) exhibits promising electrocatalytic activity in CO2 reduction to CH4. The Gibbs free energy change calculations reveal that the optimal reaction path of CO2 reduction to CH4 on Co-BHT is CO2*COOH→*CO→*CHO→ *CHOH→*CH→*CH2*CH3→CH4, with the rate-limiting step of *CO→*CHO. The Gibbs free energy change of the rate-limiting step(ΔGL) is 0.66 eV, lower than that on both 2D Cu-C3N4(ΔGL=0.75 eV) and traditional Cu(211)(ΔGL=0.74 eV). Furthermore, the studies for monolayer Cu-BHT were also carried out, where the optimal reaction path is different, and the rate-limiting step is CO2*COOH with the ΔGL of 0.76 eV. The lower ΔGL of CO2 reduction on Co-BHT than that on Cu-BHT may be attributed to its higher d-band center compared with that of Cu-BHT, which leads to stronger interactions with the intermediates. Our work predicts the promising electrocatalytic activity of Co-BHT and provides useful insights into the catalytic mechanism and performance of Metal-BHT for CO2 reduction to CH4.

    Synthesis of Li2FeP2O7 Cathode Material at Different Temperatures and Its Electrochemical Performance for Lithium Ion Batteries
    WANG Renheng, XIAO Zhe, LI Yan, SUN Yiling, FANG Shuting, ZHENG Junchao, QIAN Zhengfang, HE Zhenjiang
    2021, 42(Album-4):  1-8.  doi:10.7503/cjcu20200630
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    The cathode material Li2FeP2O7 was synthesized via freeze-drying and followed by solid state sintering method. X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and Fourier transform infrared spectroscopy(FTIR) were used to characterize the structure, composition and morphology of the material. In addition, the electrochemical performance of the Li2FeP2O7 material was investigated by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS). It was found that the greatest particle quality could be acquired when the synthesis temperature of Li2FeP2O7 was 590 ℃. The discharge specific capacity reached 55.0 mA·h·g?1 at 1.6C, which was much higher than that of the samples synthesized at other temperatures. The Li2FeP2O7 synthesized at 590 ℃ had a low impedance and a large exchange current density, which facilitated the diffusion of lithium ions and improved the electrochemical performance.

    Helical Structure and Circularly Polarized Luminescence of Naphthalene Derived Amphiphilic Molecules Through Air/water Interface Assembly
    MENG Yan, WANG Xiufeng, ZHANG Li, LIU Minghua
    2021, 42(Album-4):  1-7.  doi:10.7503/cjcu20200560
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    Langmuir-Blodgett(LB) technology precisely control the arrangement and stacking of molecules to construct ordered ultrathin films and assemblies on the two-dimensional air/water interface. Meanwhile, the asymmetric environment of the interface can also effectively amplify chirality of the assembly. In this paper, two chiral amphiphilic molecules with different substitution positions of naphthalene ring were studied. NN′-bisoctadecyl-α-naphthalene-L-amino-glutamic acid diamide(1NLG) and NN′-bisoctadecyl-β-naphthalene-L-amino-glutamic acid diamide(2NLG) were spread and assembled at air/water interface. It was showed that the substitution position affected the arrangement of amphiphilic molecules at the air/water interface. 1NLG formed uniform nanobelt structure, while 2NLG formed left-handed helix structures. Also, 2NLG LB films exhibited circularly polarized luminescence(CPL), and its dissymmetry factor(glum) was significantly enhanced than that of three-dimensional assemblies(supramolecular gel), indicating that the interface promoted the amplification of supramolecular chirality.