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Science China Chemistry 2022年第7期65卷 1225-1264页

作者： Mingliang Zhu Yunlong Guo yunqi liu Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Recent advances in organic electronics of novel materials and optoelectronic devices spark great interest in the design and synthesis of high-performance polymer semiconductors. During the last decade, isoindigo(ⅡD) and its derivatives have sprung up as common electron-deficient building blocks and obtained extensive applications in organic field-effect transistors(OFETs).In this review, we first present the current status, basic principles, and general material design strategies for OFETs. Then,multiple ⅡD-type acceptors, mature synthetic routes to monomers, and typical ⅡDs-based conjugated polymers are *** also introduce side-chain engineering and cutting-edge applications, like stretchable transistors, sensing, active-matrix driving, etc., of the classic copolymer poly(isoindigo-co-bithiophene). Green polymerization approaches towards conjugated polymers incorporating ⅡDs are subsequently discussed for efficient polymerization. Finally, we conclude this review and propose in-depth prospects with respect to material synthesis and device applications. Undoubtedly, ⅡDs-based conjugated polymers would occupy a significant position in the future of organic electronics, due to diverse building blocks, mature synthetic pathways, tunable side chains, and unique optoelectronic properties.

关键词： isoindigos green synthesis cutting-edge applications polymer field-effect transistors

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Recent progress in stretchable organic field-effect transistors

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Science China(Technological Sciences) 2019年第8期62卷 1255-1276页

作者： liu Kai GUO YunLong liu yunqi Beijing National Laboratory for Molecular Sciences Organic Solid Laboratory Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Department of Chemistry University of Chinese Academy of Sciences Beijing 100049 China

Stretchable organic field-effect transistors (STOFETs) employing organic semiconductors as active layers are highly attractive ongoing from health monitoring to biological research owing to some favorable advantages over their inorganic counterpart, including light weight, low cost, solution processing, high flexibility and simple adjustment of functionalities through molecular design. Although the development of STOFETs with original electrical performances under large mechanical deformation remain rudimentary, major efforts have recently been devoted to the investigation on STOFETs, and remarkable advances in stretchable components and novel fabrication methods have been achieved. A detailed overview of the advantages, challenges and current achievements in STOFETs was given including stretchable electrodes, semiconductors, dielectrics and substrates. Furthermore, conclusions and prospects for the future development of STOFETs with both high stretchability and superb electrical performances fabricated using intrinsically stretchable components are proposed.

关键词： STOFETs organic semiconductor high stretchability high carrier mobility

Multifunction-oriented high-mobility polymer semiconductors

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National Science Review 2024年第3期11卷 16-19页

作者： Mingliang Zhu Yunlong Guo yunqi liu Beijing National Laboratory for Molecular Sciences Organic Solids Laboratory Institute of Chemistry Chinese Academy of Sciences School of Chemical Sciences University of Chinese Academy of Sciences

The discovery of conductive polyacetylene has initiated interdisciplinary research into condensed matter physics and synthetic chemistry in organic electronics. Unlike their inorganic and small-molecule counterparts, polymer semiconductors possess the inherent advantages of facile solution processing,large-area manufacturing, excellent mechanical strength and intrinsic flexibility.

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Mechanisms of the epitaxial growth of two-dimensional polycrystals

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npj Computational Materials 2022年第1期8卷 1016-1026页

作者： Jichen Dong yunqi liu Feng Ding Centre for Multidimensional Carbon Materials Institute for Basic ScienceUlsan44919Korea Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China School of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan44919Korea

In the epitaxial growth of two-dimensional(2D)materials on substrates,2D polycrystals with various shapes have been broadly observed,but their formation mechanisms are still highly *** we present a complete study on the formation mechanisms of various 2D *** structures of the 2D polycrystals are dependent on the symmetries of both the 2D material and the *** build four complete libraries of 2D polycrystals for(i)threefold symmetric 2D materials on two-or six-fold symmetric substrates(i.e.,family-Ⅲ/Ⅱor-Ⅲ/Ⅵ),(ii)threefold symmetric 2D materials on fourfold symmetric substrates(***-Ⅲ/Ⅳ),(iii)fourfold symmetric 2D materials on three-or six-fold symmetric substrates(i.e.,family-Ⅳ/Ⅲor-Ⅳ/Ⅵ),and(iv)sixfold symmetric 2D materials on fourfold symmetric substrates(i.e.,family-Ⅵ/Ⅳ),*** four libraries of 2D polycrystals are consistent with many existing experimental observations and can be used to guide the experimental synthesis of various 2D polycrystals.

关键词： symmetric polycrystals epitaxial

Intrinsically flexible displays: key materials and devices

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National Science Review 2022年第6期9卷 171-188页

作者： Zhiyuan Zhao Kai liu Yanwei liu Yunlong Guo yunqi liu Key Laboratory of Organic Solids Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences

Continuous progress in flexible electronics is bringing more convenience and comfort to human lives. In this field, interconnection and novel display applications are acknowledged as important future ***, it is a huge scientific and technical challenge to develop intrinsically flexible displays due to the limited size and shape of the display panel. To address this conundrum, it is crucial to develop intrinsically flexible electrode materials, semiconductor materials and dielectric materials, as well as the relevant flexible transistor drivers and display panels. In this review, we focus on the recent progress in this field from seven aspects: background and concept, intrinsically flexible electrode materials, intrinsically flexible organic semiconductors and dielectric materials for organic thin film transistors(OTFTs), intrinsically flexible organic emissive semiconductors for electroluminescent devices, and OTFT-driven electroluminescent devices for intrinsically flexible displays. Finally, some suggestions and prospects for the future development of intrinsically flexible displays are proposed.

关键词： intrinsically flexible display intrinsically flexible electrode organic semiconductor transistor driver electroluminescent device

Ultra-deep desulfurization by reactive adsorption desulfurization on copper-based catalysts

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Journal of Energy Chemistry 2019年第2期28卷 8-16页

作者： Yaqing liu Hongying Wang Jinchong Zhao yunqi liu Chenguang liu State Key Laboratory of Heavy Oil Processing Key Laboratory of CatalysisChina National Petroleum Corporation (CNPC)China University of Petroleum

In this paper,a novel copper-based catalyst for FCC gasoline improving the ability of removal the sulfur and avoiding the loss of the octane number from olefin saturation by reactive adsorption desulfurization(RADS) was *** series of Cu/Zn O-Al_2 O_3 catalysts were characterized by X-ray powder diffraction(XRD),N_2 adsorption analysis and temperature-programmed reduction(TPR) studies,X-ray photoelectron spectroscopy(XPS),scanning electron microscope(SEM) and transmission electron microscopy(TEM).The experiment results showed that the catalysts had an optimum desulfurization ability with copper loading 6 wt%,which the sulfur contents of product decreased less than 10 μg/g and olefin contents decreased from 16.19% to 14.14% for the long period *** appropriate Cu loading content could lead to the high active and low apparent activation energy(E_a).Therefore,the Cu-based catalyst may become a novel catalyst for second-generation for reactive adsorption desulfurization,which achieves the high desulfurization active and low olefins saturation to satisfy the upgrading the product.

关键词： Cu/ZnO-Al2O3 Desulfurization activity Octane number Olefins saturation Stability

Weakening internal diffusion effect in selective hydrodesulfurization of FCC gasoline by novel designed eggshell CoMoS/Al_2O_3 catalysts

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Journal of Natural Gas Chemistry 2012年第2期21卷 194-199页

作者： Bin liu Yongming Chai Yajing Wang yunqi liu Chenguang liu State Key Laboratory of Heavy Oil Processing Key Laboratory of CatalysisChina National Petroleum Corp.(CNPC)China University of Petroleum(East China)Qingdao 266555ShandongChina

A simple method for preparation of presulfided eggshell CoMoS/γ-Al2O3 catalysts with sharp boundary is developed, through which the eggshell thicknesses of Co and Mo could be easily regulated by controlling the impregnation time. According to the results characterized by EDS, XRD, HRTEM and FT-IR of adsorbed CO, the active component structures, the nature and/or the amount of active sites on the eggshell catalyst are similar to these on the uniform catalyst. The evaluation results of the catalytic performance in selective hydrodesulfurization （HDS） of FCC gasoline show the presence of significant internal diffusion inhibition effect on HDS of S-compounds especially in the uniform catalyst. Compared with uniform catalyst, the eggshell catalyst could remarkably reduce such an internal diffusion inhibition effect due to a shortened diffusion path of the reactants, thus showing higher HDS activity and selectivity.

关键词： CoMoS/γ-Al2O3 eggshell catalyst uniform catalyst internal diffusion hydrodesulfurization

Direct synthesis of unnatural amino acids and modifications of peptides via LADA strategy

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Chinese Chemical Letters 2024年第1期35卷 237-242页

作者： yunqi liu Junliang Zhou Zhankui Sun Shanghai Frontiers Science Center for Drug Target Identification and Drug Delivery School of Pharmaceutical SciencesShanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Pharm-X CenterSchool of Pharmaceutical SciencesShanghai Jiao Tong UniversityShanghai 200240China AI Pharma Center Zhangjiang Institute for Advanced StudyShanghai Jiao Tong UniversityShanghai 201203China Shanghai Artificial Intelligence Laboratory Shanghai 200232China

Unnatural amino acids(UAAs)have broad applications in pharmaceutical sciences and biological *** synthetic methods for UAAs mainly rely on asymmetric catalysis and often require several *** is a lack of direct and simple *** address this challenge,we designed the LADA(labeling-activation-desulfurization-addition)strategy:selective labeling and activation of cysteine residues,the photocatalytic desulfurization and the subsequent radical addition to *** composed of two steps,it is one-pot synthesis and has advantages such as high functional group tolerance,biocompatible reaction condition,and retained *** highly efficient strategy was successfully applied in the direct synthesis of unnatural amino acids and modifications of peptides with more than 50 examples.

关键词： Unnatural amino acids Peptide modifications Desulfurization Cysteine Radical addition

Current development in wearable glucose meters

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Chinese Chemical Letters 2021年第12期32卷 3705-3717页

作者： Qiuyuan Chen Yan Zhao yunqi liu Department of Materials Science Fudan UniversityShanghai 200433China

Diabetes is one of the most disturbing chronic diseases in the world. The improvement of treatment efficiency brought by self-monitoring of blood glucose can relieve symptoms and reduce complications,which is considered as the gold standard of diabetes diagnosis and nursing. Compared to the traditional finger pricking measurement with painful and discontinuous processes, continuous blood glucose monitoring(CGM) presents superior advantages in wearable and continuous assessment of blood glucose levels. However, widely used implantable CGM systems at present require implantation operation and are highly invasive, so it is hard to be accepted by users. Except for the blood, available fluids in humans,such as interstitial fluid(ISF), sweat, tears and saliva, also contain glucose associated with blood sugar and can be extracted more easily. Therefore, these more accessible fluids are expected to realize minimized traumatic blood glucose monitoring. This review introduces the latest development of wearable minimally-/non-invasive CGM device, focusing on the types of blood substitute biological fluid and suitable monitoring approaches. We also analysis the merits and drawbacks of each method, and discuss the properties such as sensitivity, stability and convenience of each meter. Beyond highlighting recent key work in this field, we discuss the future development trend of wearable minimally-/non-invasive glucose meters.

关键词： Diabetes Glucose sensors Noninvasive Electrochemical Healthcare systems Wearable devices

Effect of Ti Addition on the Microstructure and Property of FeAlCuCrNiMo0.6 High-Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2020年第7期33卷 957-967页

作者： Yunhai Su Xuewei Liang yunqi liu Zhiyong Dai School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

FeAlCuCrNiMo0.6Tix(x=0.2,0.6,0.8) high-entropy alloys were fabricated with flux-cored wire and surfaced on low-carbon steel by gas metal arc *** effect of Ti addition on the microstructures and properties of FeAlCuCrNiMo0.6Tix HEAs surfacing layer was systematically *** results show that FeAlCuCrNiMo0.6Tix HEAs surfacing layer exhibits a majority of BCC solid solution based on Fe-Cr phase and a small amount of MC *** and wear tests results show that the addition of Ti can significantly improve the microhardness and wear resistance of the surfacing *** microhardness of surfacing layer can reach up to 642 HV0.5,which is about 2.8 times that of the ***,the wear mass loss is *** corrosion test results show that the addition of Ti can improve the corrosion resistance of surfacing layer,which is better than 304 stainless steel *** the increase in Ti,the corrosion resistance increases first and then *** the Ti content is 0.6,the self-corrosion current density of polarization curve is the smallest,the capacitive impedance radius of electrochemical impedance spectroscopy is the largest,and the corrosion resistance effect is the best.

关键词： corrosion resistance wear