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Asymmetric side-chain engineering of organic semiconductor for ultrasensitive gas sensing

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Chinese Chemical Letters 2024年第3期35卷 428-433页

作者： Xiaoying Ma Xiaojuan Dai Lanyi Xiang Jiajun Chang Danfeng Zhi Haozhen Zhao Zhenjie Ni Ye Zou Xike Gao Fengjiao Zhang School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China laboratory of Organic Solids Institute of ChemistryChinese Academy of SciencesBeijing 100190China Key laboratory of Synthetic and Self-Assembly Chemistry for Organic functional Molecules Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China Binzhou Institute of Technology Binzhou 256606China

Molecular structure of organic semiconductor plays a critical role in determining the performance and functionality of organic electronic devices,by optimizing the electrical,optical and physicochemical *** alkyl chains are fundamental units in tailering the solubility and assemblability,among which the asymmetric properties have been reported as key element for controlling the packing motifs and intrinsic charge ***,we expanded the scope of molecular asymmetry dependent sensing features based on a new series of naphthalene diimides(NDI)-based derivatives substituted with a same branching alkyl chain but various linear-shaped alkyl chains(Cn-).A clear molecular stacking change,from head-to-head bilayer to head-to-tail monolayer packing model,is observed based on the features of anisotropic molecular interactions with the change in the chain *** importantly,a unique LUMO level shift of 0.17 eV is validated for NDI-PhC4,providing a record sensitivity up to 150%to 0.01 ppb ammonia,due to the desired molecular reactivity and device amplification *** results indicate that asymmetric side-chain engineering opens a route for breath healthcare.

关键词： Organic thin film transistor Asymmetric side chain Gas sensing Molecular stacking Energy level manipulating

Enhanced electrical properties and Vickers hardness of calcium bismuth niobate ceramics by W/Co substituted at B-site

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Journal of Advanced Dielectrics 2024年第4期14卷 92-103页

作者： Fei Wang Jia Yang Qing Yang Ning Chen Xinji Yang Mingyue Mo Jie Xing Zhi Tan Zhongqing Tian Fancheng Meng Yuheng Guo Huixing Lin Jianguo Zhu College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054P.R.China College of Materials Science and Engineering Sichuan UniversityChengdu 610064P.R.China School of Electronic Engineering Chengdu Technological UniversityChengdu 611730P.R.China Key laboratory of Inorganic functional Material and device Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899P.R.China

Calcium bismuth niobate(CBN)ceramic,as a core element of high-temperature piezoelectric sensors,has attracted widespread attention due to its high Curie temperature within the class of Aurivillius ***,CBN usually faces two *** piezoelectric constant and low *** this work,CBN-based ceramics with donor–acceptor ions(W/Co)co-substituted at B-site were prepared by solid-state reaction method,and structure–property relationship of ceramics was studied in ***-substitution of W/Co ions effectively improved the electrical property and hardness of CBN ***_(2)Nb_(1.91)(W_(2/3)Co_(1/3)T_(0.09)O_(9))exhibits enhanced electrical and mechanical properties including high resistivity of-10^(7)Ω·cm at 500℃,piezoelectric constant of-15.3 pC/N and hardness value of-3.57 *** values are two orders of magnitude,over two times,and 1.36 times higher than those of pure CBN ceramic,*** work provides a reference for exploring other bismuth-layered structural ceramics.

关键词： Calcium bismuth niobate ceramics donor and acceptor ions B-site electrical properties Vickers hardness

Insight into vertical piezoelectric characteristics regulated thermal transport in van der Waals two-dimensional materials

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Rare Metals 2024年第2期43卷 770-779页

作者： Dong-Hai Wei E Zhou Jin-Yuan Xu Hui-Min Wang Chen Shen Hong-Bin Zhang Zhen-Zhen Qin Guang-Zhao Qin State Key laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082China Hunan Key laboratory for Micro-Nano Energy Materials and device and School of Physics and Optoelectronics Xiangtan UniversityXiangtan411105China Institute of Materials Science Technical University of DarmstadtAlarich-Weiss-Str.264287DarmstadtGermany School of Physics and Microelectronics Zhengzhou UniversityZhengzhou450001China

The urgent demand of extreme(ultra-high/low)thermal conductivity materials is triggered by the high-power device,where exploring the theories and mechanisms of regulating thermal transport properties plays a key ***,we elaborately investigate the effect of vertical(out-of-plane)piezoelectric characteristics on thermal transport,which is historically *** different stacking-order(AA and AB)bilayer boron nitride(Bi-BN)in two-dimensional(2D)materials are selected as study *** performing state-of-the-art first-principles calculations,it is found that the polarization charge along the out-of-plane orientation ascends significantly with the increasing piezoelectric response in AB stacked Bi-BN(Bi-BN-AB)followed by the enhanced interlayer B–N atomic ***,the amplitude of phonon anharmonicity in Bi-BN-AB increases larger than that in the AA stacked Bi-BN(Bi-BN-AA),resulting in the dramatic weakening of the thermal conductivity by 20.34%under 18%*** research reveals the significant role of the vertical(out-of-plane)piezoelectric characteristic in regulating thermal transport and provides new insight into accurately exploring the thermal transport performance of 2D van der Waals materials.

关键词： Thermal conductivity Piezoelectric effect 2D materials Bilayer BN Strain engineering

Resist Thermal Shock Through Viscoelastic Interface Encapsulation in Perovskite Solar Cells

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Energy & Environmental Materials 2024年第6期7卷 238-245页

作者： Sai Ma Jiahong Tang Guizhou Yuan Ying Zhang Yan Wang Yuetong Wu Cheng Zhu Yimiao Wang Shengfang Wu Yue Lu Shumeng Chi Tinglu Song Huanping Zhou Manling Sui Yujing Li Qi Chen Beijing Key laboratory of Construction Tailorable Advanced functional Materials and Green Applications MIIT Key Laboratory for Low-dimensional Quantum Structure and DevicesExperimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Key laboratory of Microstructure and Properties of Solids College of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China Analysis and Testing Center Jiangnan UniversityWuxi 214122China School of Materials Science and Engineering Peking UniversityBeijing 100871China

Enhancing the lifetime of perovskite solar cells(PSCs)is one of the essential challenges for their *** the external encapsulation protects the perovskite device from the erosion of moisture and oxygen under various harsh ***,the perovskite devices still undergo static and dynamic thermal stress during thermal and thermal cycling aging,respectively,resulting in irreversible damage to the morphology,component,and phase of stacked ***,the viscoelastic polymer polyvinyl butyral(PVB)material is designed onto the surface of perovskite films to form flexible interface *** PVB interface encapsulation,the surface modulus of perovskite films decreases by nearly 50%,and the interface stress range under the dynamic temperature field(−40 to 85°C)drops from−42.5 to 64.8 MPa to−14.8 to 5.0 ***,PVB forms chemical interactions with FA+cations and Pb^(2+),and the macroscopic residual stress is regulated and defects are reduced of the PVB encapsulated perovskite *** a result,the optimized device's efficiency increases from 22.21%to 23.11%.Additionally,after 1500 h of thermal treatment(85°C),1000 h of damp heat test(85°C&85%RH),and 250 cycles of thermal cycling test(−40 to 85°C),the devices maintain 92.6%,85.8%,and 96.1%of their initial efficiencies,respectively.

关键词： device stability perovskite solar cells stress field surface modulus thermal shock

Cyclocarysaponins A–J, dammarane-type triterpenoid glycosides from the leaves of Cyclocarya paliurus

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Chinese Journal of Natural Medicines 2024年第10期22卷 955-964页

作者： XI Huiting YUAN Mingming XIE Jianhua WANG Yuanxing State Key laboratory of Food Science and Resources Nanchang University Jiangxi Institute for Drug Control NMPA Key Laboratory of Quality Evaluation of Traditional Chinese Patent Medicine Jiangxi Provincial Engineering Research Center of Drug and Medical Device Quality

Ten previously undescribed dammarane-type triterpenoid glycosides, cyclocarysaponins A–J(1–10), were isolated from the leaves of Cyclocarya paliurus(Batal.) Iljinskaja. The structures of these compounds were characterized through detailed spectroscopic analysis, including 1D and 2D nuclear magnetic resonance(NMR) and high-resolution electrospray ionization mass spectrometry(HR-ESI-MS). The cytotoxic activities of all isolates were assessed against five human cancer cell lines(Bel-7402, Caski, BGC-823, A2780, and HCT-116). Of the tested compounds, compounds 1, 7, and 9 exhibited selective cytotoxicity against one or more human cancer cell lines.

关键词： Cyclocarya paliurus Cyclocarysaponin Cytotoxic activities Juglandaceae Triterpenoid glycosides

A Generic Strategy to Create Mechanically Interlocked Nanocomposite/Hydrogel Hybrid Electrodes for Epidermal Electronics

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Nano-Micro Letters 2024年第5期16卷 120-133页

作者： Qian Wang Yanyan Li Yong Lin Yuping Sun Chong Bai Haorun Guo Ting Fang Gaohua Hu Yanqing Lu Desheng Kong College of Engineering and Applied Sciences National Laboratory of Solid State Microstructureand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023People’s Republic of China State Key laboratory of Analytical Chemistry for Life Science and Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210023People’s Republic of China College of Chemical Engineering and Technology Engineering Research Center of Seawater Utilization Technology of Ministry of EducationState Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300130People’s Republic of China Key laboratory of Intelligent Optical Sensing and Manipulation Nanjing UniversityNanjing 210093People’s Republic of China

Stretchable electronics are crucial enablers for next-generation wearables intimately integrated into the human *** the primary compliant conductors used in these devices,metallic nanostructure/elastomer composites often struggle to form conformal contact with the textured *** electrodes have been consequently developed based on conductive nanocomposite and soft hydrogels to establish seamless skin-device ***,chemical modifications are typically needed for reliable bonding,which can alter their original *** overcome this limitation,this study presents a facile fabrication approach for mechanically interlocked nanocomposite/hydrogel hybrid *** this physical process,soft microfoams are thermally laminated on silver nanowire nanocomposites as a porous interface,which forms an interpenetrating network with the *** microfoam-enabled bonding strategy is generally compatible with various *** resulting interlocked hybrids have a 28-fold improved interfacial toughness compared to directly stacked *** electrodes achieve firm attachment to the skin and low contact impedance using tissue-adhesive *** have been successfully integrated into an epidermal sleeve to distinguish hand gestures by sensing mus-cle *** nanocomposite/hydrogel hybrids reported here offer a promising platform to combine the benefits of both materials for epidermal devices and systems.

关键词： Stretchable electronics Epidermal electronics Silver nanowire Conductive nanocomposites Hydrogel

Effect of coil and chamber structure on plasma radial uniformity in radio frequency inductively coupled plasma

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Plasma Science and Technology 2024年第7期26卷 58-66页

作者：赵洋周晓华高升荣宋莎莎赵玉真 Shaanxi International Joint Research Center for Applied Technology of Controllable Neutron Source Xijing UniversityXi’an 710123People’s Republic of China Technological Institute of Materials&Energy Science(TIMES) Xi’an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion DeviceSchool of Electronic InformationXijing UniversityXi’an 710123People’s Republic of China

Enhancing plasma uniformity can be achieved by modifying coil and chamber structures in radio frequency inductively coupled plasma(ICP)to meet the demand for large-area and uniformly distributed plasma in industrial *** study utilized a two-dimensional self-consistent fluid model to investigate how different coil configurations and chamber aspect ratios affect the radial uniformity of plasma in radio frequency *** findings indicate that optimizing the radial spacing of the coil enhances plasma uniformity but with a reduction in electron ***,optimizing the coil within the ICP reactor,using the interior point method in the Interior Point Optimizer significantly enhances plasma uniformity,elevating it from 56%to 96%within the range of the model ***,when the chamber aspect ratio k changes from 2.8 to 4.7,the plasma distribution changes from a center-high to a saddleshaped ***,the plasma uniformity becomes ***,adjusting process parameters,such as increasing source power and gas pressure,can enhance plasma *** findings contribute to optimizing the etching process by improving plasma radial uniformity.

关键词： inductively coupled plasma fluid simulation optimized coil chamber aspect ratio plasma uniformity

Effect of nano-CaO particle on the microstructure,mechanical properties and corrosion behavior of lean Mg-1Zn alloy

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Journal of Magnesium and Alloys 2024年第2期12卷 794-814页

作者： Guangxin Shen Shaoyuan Lyu Leiting Yu Tianlu Li Chen You Xuewei Wang Minfang Chen Bin Jiang School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China Key laboratory of Display Materials and Photoelectric device(Ministry of Education) Tianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Function Materials Education Tianjin University of TechnologyTianjin 300384China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

The effects of nano-CaO contents on the microstructure,mechanical properties and corrosion resistance of lean Mg-1Zn alloy were *** results showed that the addition of nano-CaO significantly refined the grain size and improved mechanical properties of the Mg-1Zn *** the same time,CaO reacted with molten Mg in situ to form nano-MgO,whose corrosion product in SBF solution was the same with the degradation product of Mg matrix,resulting in the enhanced compactness of the Mg(OH)_(2) layer and reduced corrosion rate of *** Mg-1Zn alloy had lower corrosion resistance due to excessively large grain size and shedding of corrosion *** composite with 0.5 wt.%CaO had the best corrosion resistance with a weight loss of 9.875 mg·y^(-1)·mm^(-2)due to the small number of Ca_(2)Mg_(6)Zn_(3) phase and suitable grain *** for composites with high content of CaO(0.7 wt.%and 1.0 wt.%),they had lower corrosion resistance due to the coexistence of large number of Ca_(2)Mg_(6)Zn_(3) and Mg_(2)Ca at grain boundaries,especially for 1.0 wt.%CaO composite,resulting from the strong micro-galvanic corrosion.

关键词： Lean Mg alloy In situ MgO Nanoparticles Grain refinement Corrosion resistance

Defect engineered nickel hydroxide nanosheets for advanced pseudocapacitor electrodes

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Nano Research 2024年第6期17卷 5233-5242页

作者： Yaohang Gu Yuxuan Zhang Xuanyu Wang Ateer Bao Bo Ni Haijun Pan Xiaoyan Zhang Xiwei Qi School of Materials Science and Engineering Northeastern UniversityShenyang 110189China College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210China Key laboratory of Dielectric and Electrolyte functional Material Hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao 066004China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China

While the past years have witnessed great achievement in pseudocapacitors,the inauguration of electrode materials of high-performance still remains a formidable ***,the capacity and rate capability of the electrode depends largely on its electrical conductivity,which ensures fast charge transfer kinetics in both the grain bulk and grain ***,nickel hydroxides with oxygen vacancies are facilely fabricated via a hydrothermal *** active materials exhibit a high specific capacitance of 3250 F·g^(−1)and a high areal of capacitance of 14.98 F·cm^(−2)at 4.6 mA·cm^(−2).The asymmetric supercapacitor device based on our material delivers a high energy density of~71.6 Wh·kg^(−1)and a power density of~17,300 W·kg^(−1)and could retain~95%of their initial capacitance even after 30,000 *** addition,the defect-rich hydroxides demonstrate higher electrical conductivity as well as dielectric constant,which is responsible for the superior pseudocapacitive *** new scientific strategy in terms of taking the advantages of oxygen vacancies might open up new opportunities for qualified pseudocapacitive materials of overall high performances not only for nickel hydroxides but also for other metal hydroxides/oxides.

关键词： pseudocapacitors nickel hydroxides oxygen vacancies electrical conductivity