最新刊期
卷 51 ， 期 5 ， 2020
- 摘要：Optoelectronic devices based on semiconductor polymers have attracted extensive attention due to their solution processability, light weight, flexibility and low cost. The fabrication of polymer optoelectronic devices with high integration and performance requires controllable patterning technology. The past decade has witnessed the rapid development of different strategies, which focus on patterning conducting polymers with high precision and resolution. Herein, we summarized processing and patterning methods including photolithography, moulding and printing, and our patterning techniques based on the superwetting interface, which introduced a capillary force to steer the dewetting dynamics and mass transport process. The asymmetric-wettability topographical surfaces were integrated onto a 3D template by a selective modification process. For a topographical template with periodically arranged micropillars, two dewetting mechanism were allowed. We then briefly summarized the recent researches and developments of these polymer patterning technologies in the fields of field-effect transistors, photodetectors, vapor sensors, light-emitting diodes and solar cells. Finally, an outlook is provided with regard to the concerns and challenges for the future study on the mechanism and the integrated optoelectronic devices of conducting polymer in this field. We speculate that this article could serve as a trigger for future development in the fields of polymer functional materials pattern.关键词：Semiconducting polymer;Pattern;Optoelectronic devices;Superwettability
- 250
- |
- 92
- |
- 3
发布时间：2021-01-26 - 摘要：Block copolymers can microphase separate into a variety of well-defined nanoscale structures. Conjugated polymers are a kind of semi-rigid macromolecules with special mechanical, conducting, and optoelectronic properties. All-conjugated block semiconducting copolymers have gained immense interest because they combine the optoelectronic properties of conjugated polymers with the fascinating self-assembly properties of block copolymers. In this feature article, we introduced some research progresses on poly(3-alkylthiophene) and poly(3-alkylselenophene)-based all-conjugated diblock copolymers, focusing on controlling the condensed structure of these two systems in our group. By tuning their molecular structures (such as main/side chains, the length of alkyl side chains and side substitutions,etc.), and the post-treatment in their solution and film states (such as changing solvents, aging, thermal and solvent annealing, etc.), the synergy and competition between two basic phase transitions, that is, their microphase-separated behavior and crystalline behavior were systematically studied and clarified. As a result, their condensed structures were efficiently tuned. Furthermore, their optoelectronic properties such as charge mobilities based on their different condensed structures were investigated to build up the relationship among their chemical structures, condensed structures, and device performance. As poly(3-alkylthiophene) and poly(3-alkylselenophene) are model systems with simple molecular structures, the rules and knowledge about controlling their condensed structures obtained from these model systems are expected to be applied in other conjugated systems with more complexed molecular structures and better properties.关键词：Block copolymer;Conjugated polymer;Condensed structure;Microphase separation;Optoelectronic property
- 133
- |
- 55
- |
- 0
发布时间：2021-01-26 - 摘要：Organic polymer semiconductors and field-effect transistors (OFET) are the frontier interdisciplinary research directions of chemistry, materials, semiconductors and microelectronics. Polymer semiconductors are the important research contents in this field, among which ambipolar semiconducting polymer materials, which have the double carrier transport ability, have received extensive attention in the academic field. This unique property gives ambipolar semiconducting polymers many applications, such as low-cost logic circuit, organic light-emitting transistors (OLETs), low-energy cost memory device, and near infrared detectors. In this feature article, the research progress of ambipolar polymer semiconductors and transistors is summarized. First, we give brief introduction of the configuration of OFETs and its related parameters. And then, our research work in designing new ambipolar polymers based on bis-acceptors or enhancing acceptor ability with withdraw group are introduced. In fact, except designing of polymer structures, solution-process methods are also very important for low-cost and large-area organic devices. Therefore, different solution-processing technologies, such as spin-coating, sheer-coating, bar-coating, inkjet printing, screen printing, and slot-die, are discussed for achieving high performance OFETs. Further, functional application of D-A ambipolar polymer semiconductors in inverter circuit, OLETs, and memory devices are mainly described in this paper. Finally, the scientific problems and development direction in the research process of ambipolar polymer semiconductors and devices are also discussed.关键词：High performance;Ambipolar;Polymer semiconductors;Transistors
- 160
- |
- 60
- |
- 3
发布时间：2021-01-26 -
Molecular Design and Device Performance of Thermally Activated Delayed Fluorescent Polymer Materials
摘要：Thermally activated delayed fluorescence (TADF) polymer materials have achieved rapid development since their application in organic light emitting diodes (OLEDs). So far, various TADF polymer materials with different molecular structures and excellent properties have been reported, of which external quantum efficiency of OLEDs have achieved 23.5%. They possess all-organic chemical structures without heavy metals, 100% theoretical internal quantum efficiency, and the advantages of large-area manufacturing by solution process. Nevertheless, when using polymers to develop low-cost display or device, there are still many problems to be overcome, such as, the lower quantum efficiency compared to small molecules, efficiency roll-off at high brightness, and poor device stability. In addition, the efficiency development of devices with different colors of light is obviously uneven and the efficiency of high-color purity devices is poor. Herein, we summarize the research progresses of TADF polymers with different structures and discuss the efficiency development of three primary colors and white OLEDs devices. The emphasis of this review is especially focused on our research work on linear TADF polymers design and their LOEDs device performance, and summarizes our research on TADF polymer color tuning and efficiency inprovement. In addition, the problems and future development of TADF polymers were also discussed in the end.关键词：Thermally activated delayed fluorescence;Polymer;Solution processing;Organic light-emitting diodes- 266
- |
- 80
- |
- 4
发布时间：2021-01-26 - 摘要：Electrostatic capacitors with extremely fast discharge speed and ultra-high power density, are an important class of energy storage element in advanced electrical and electronic systems. Polymer dielectrics are widely employed as capacitor dielectric materials because of their high breakdown strength, the ability to self-heal, low loss and low cost. However, polymer dielectrics usually show low energy density and poor thermal stability, which restrict their applications in high power electronics and compact power modules. In order to improve the energy density and temperature capability of polymer dielectrics, we have carried out a series of study. This review focuses on our recent progress in developing high-performance polymer-based dielectric materials and in understanding the corresponding dielectric phenomena. The main content includes the synthesis and characterization of PVDF-based ferroelectric polymers, copolymers and nanocomposites, and polymer-based high temperature dielectrics, as well as the investigation of interfacial property in the polymer matrix/inorganic nanoparticle composite system. At the end of this review, we summarize the existing challenges and propose the future directions in the field of polymer-based capacitor dielectrics.关键词：Polymer dielectrics;Nanocomposites;Energy storage density;Interface
- 223
- |
- 77
- |
- 7
发布时间：2021-01-26 - 摘要：Liquid crystals, featured by self-assembly property and stimuli responsiveness, have attracted intensive attention not only in fundamental material sciences, but also in advanced functional applications. At different phases, liquid crystals exhibit distinguished structures, such as layered focal conic domains and oil streaks in smectics, lying or standing helical structures in cholesterics, and cubic lattices stacked by double-twisted structures in blue phases. These hierarchical structures present novel optical, mechanical and electromagnetic characteristics, which can be further modulated by external stimuli. In recent years, high-quality liquid crystal hierarchical structures have been realized in large scalesvia optimizing material components and introducing external confinements. Multi-dimensional manipulations of these hierarchical structures have been achieved by adopting various external stimuli. A series of remarkable applications of such liquid crystal hierarchical structures in particle manipulation, surface modification and optical devices have been demonstrated. This paper reviews the latest research progress in above fields and aims to extend the understanding of soft matter architectures.关键词：Liquid crystal;Photoalignment;Soft matter;Particle manipulation;Optical device
- 140
- |
- 48
- |
- 3
发布时间：2021-01-26 - 摘要：The crystallization of polymers under nano-confinement has attracted great attention in recent years. Anodic aluminum oxide (AAO) template with uniform nano-cylinders provides an ideal model system for constructing one-dimensional nano-confinement environments. For crystalline polymers under confinement, the nucleation mechanism, crystal orientation, crystallization kinetics, crystallinity, and polymorphic preference are much different from those of the bulk. In the present paper, the research advances on the crystallization mechanism under confinement in AAO templates are summarized with an emphasis on the research results from the authors’ group. The discussions are divided into four sections. (1) Nucleation. There is still a lack of a strict criterion for nucleation mechanism, especially the discrimination between homogeneous and surface nucleation. The frequently reported “multiple nucleation events” prove to result from percolation due to surface residue. The interaction between the polymer and the AAO wall plays an important role in the nucleation of poly(lactic acid). (2) The anisotropic crystalline growth. This section deals with the factors that govern the orientation, including the kinetic selection model, thermodynamic stability, and interfacial interactions. (3) Crystallization kinetics. The Avrami index decreases under confinement. First-order kinetics is observed for polymers within AAO. The Avrami index, that is remarkably smaller than 1, can be explained by the competition growth of multiple nuclei with different growth rates within one pore. (4) Crystallinity and polymorphic preference. The metastable crystalline modifications that are not favored in bulk become more pronounced under confinement within AAO, which provides a method to prepare functional nano-fibers. The questions to be solved on this topic are proposed.关键词：Polymer crystallization;Nucleation;Orientation;Crystallization kinetics;Nano-confinement
- 177
- |
- 56
- |
- 3
发布时间：2021-01-26 - 摘要：Conducting polymer/noble metal nanoparticle hybrids have aroused increasing interest due to their potential application in fields of catalysis, sensing, surface-enhanced Raman, photo-thermal therapy and so on. The incorporation of conducting polymers with noble metal nanoparticles can produce new hybrids showing distinct properties that are not observed in the individual components. In general, the strategies in the synthesis of conducting polymer/noble metal nanoparticle hybrids involve the direct mixing of conducting polymers and noble metal nanoparticles, redox reaction between conducting polymers and noble metal ions, redox reaction between aniline monomers and noble metal ions, as well as aniline monomer polymerization in the presence of noble metal nanoparticles. Noble metal nanoparticles are either supported on surfaces of conducting polymer nanostructures or embedded in conducting polymer matrix. Our research focuses on the controllable synthesis of polyaniline/noble metal nanoparticle hybrids with compact interactions, which will show potential application as advanced nanocatalysts in diverse catalytic reactions. This fearfure artcle aims at reviewing our work in recent years on the synthetic strategies and catalysis application of polyaniline/noble metal nanoparticle hybrids. The supported polyaniline/noble metal nanoparticle hybrids can be synthesized through the redox reaction between polyaniline and noble metal ion, where the configuration of hybrids and size of supported noble metal nanoparticles are determined by polyaniline nanostructures and functional doping acids. The embedded polyaniline/noble metal nanoparticle hybrids can be synthesized through the redox reaction between aniline monomer and noble metal ion, where the functional substituents in aniline monomer play the determining role in reducing the size of noble metal nanoparticles in hybrids. In addition, the polymerization of aniline monomer on surfaces of noble metal nanoparticles can also lead to embedded polyaniline/noble metal nanoparticle hybrids with compact interaction. Polyaniline/noble metal nanoparticle hybrids have been successfully applied as nanocatalysts in nitrophenol reduction, alcohol oxidation, Suzuki-Miyaura cross-coupling, and Ullmann reactions. In particular, a novel yolk-in-shell nanostructure of polyaniline/Au hybrids have been emphasized and the synergistic catalytic effect of polyaniline for Au nanoparticles has been discussed.关键词：Conducting polymer;Polyaniline;Noble metal nanoparticle;Hybrid;Catalysis
- 160
- |
- 46
- |
- 4
发布时间：2021-01-26 - 摘要：As an emerging class of bioinspired materials, slippery liquid-infused porous surfaces (solid-liquid composite surface) inspired by Nepenthes pitcher plants, which are fabricated by the infusion of lubricating fluids into porous surfaces, have attracted extensive attention because of their great value in fundamental research and practical applications. Interface adhesion is one of the most important properties of polymer solid-liquid composite materials. Adhesion between solid and liquid can be seen everywhere in human life, agriculture and industry, such as oil-water separation, droplet manipulation, lab on the chip, high efficiency heat exchanger, and water collection. Hence, accurate regulation of interface adhesion plays a vital role in promoting the development and application of such materials. This paper mainly reviews adhesion regulation of polymer solid-liquid interface from three aspects: stability, directivity, and intelligence. The first aspect mainly focuses on improving anti-adhesive stability and mechanical stability of the polymer solid-liquid composite surface by introducing nanoscale layered structures and hetero-structures into surface microstructure. The second aspect summarizes directional adhesion of polymer solid-liquid composite interface, designed by combining the directional polymer surfaces and lubricants. The third aspect highlights intelligent regulation of interface adhesion, which was achieved by introducing smart response element into the polymer solid-liquid composite interface to realize reversible regulation of the adhesion between the interface and liquid under the external field. Finally, the existing problems of this field are summarized and their future development directions are forecasted.关键词：Polymer solid-liquid composite interfaces;Liquid adhesion;Stability regulation;Directional regulation;Smart regulation
- 227
- |
- 79
- |
- 2
发布时间：2021-01-26 - 摘要：With great success of cancer immunotherapy in clinical practice, extensive attentions have been attracted to improve the efficacy of anti-tumor therapy by inducing anti-tumor immune response. However, there exists a complicated immunosuppressive tumor microenvironment within tumor tissue, which severely reduces the effectiveness of cancer immunotherapy. For a long period of time, polymeric materials have been used as important drug delivery carriers, but their applications in the regulation of tumor immune microenvironment are still in an infant stage. In this review, we described the characteristics of tumor immune microenvironment, which includes the presence of a variety of immune suppressive cells, such as regulatory T cells (Tregs), myeloid-derived suppressor cells (MDSCs) and tumor associated macrophage (TAMs),etc., as well as large amounts of cytokines and chemokines, metabolites, etc. secreted by immune cells and tumor cells. Then, we systemically summarized the strategies of polymeric materials in the regulation of tumor immunosuppressive environment, including enhancing tumor immunogenicity, regulating immunosuppressive cells, and cytokines as well as combination therapy. In the end, we discussed the perspective and challenges for advanced design of polymeric materials to regulate the tumor immune microenvironment, and concluded that by regulating or reversing the immunosuppressive microenvironment, anti-tumor efficacy can be effectively improved.关键词：Polymeric materials;Tumor immune microenvironment;Immunotherapy;Drug delivery
- 248
- |
- 62
- |
- 2
发布时间：2021-01-26 - 摘要：An unconventional resistivity-strain behavior — the resistivity of nickel/polyurethane composites decreases by more than six orders of magnitude under 20% tensile strain was observed for the first time, while the conductive network evolution mechanism responsible for such unusual behavior is still unclear. In this work, the frequency dependence of various parameters of two nickel/polyurethane composite systems with contrary strain sensing behaviors was investigated by means of impedance spectra (IS) to achieve better understanding. Through further analysis using fitting parameters of Nyquist plot, the changes in the resistance of aggregates and the resistance between aggregates under tension were calculated and two different evolution modes of conductive network for both composite systems were proposed. It is illustrated that the percolation behavior occurred under tension for the composite with 27.5 vol% filler concentration due to the dimensional change of these aggregates, which is named as stretch-induced percolation. However, no continuous conductive network is constructed in the matrix within the whole strain range for composite with 25 vol% filler loading, because such content is much lower than that in the percolation region. This study provides a new understanding for the variation in conductive network of conductive polymer composites (CPCs) during stretching, and offers a new strategy to investigate the evolution of conductive network in CPCs.关键词：Conductive network;Impedance spectra;Resistance in aggregate;Resistance between aggregates;Stretch-induced percolation
- 79
- |
- 35
- |
- 1
发布时间：2021-01-26
- Postal code：100190
- Tel：010-62588927 Email：gfzxb@iccas.ac.cn
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备05002797号-8
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0