Precise modulation of the structure and composition of electrocatalysts is critical for promoting the kinetically sluggish process of oxygen reduction reaction(ORR)and oxygen evolution reaction(OER).Covalent organic f...Precise modulation of the structure and composition of electrocatalysts is critical for promoting the kinetically sluggish process of oxygen reduction reaction(ORR)and oxygen evolution reaction(OER).Covalent organic frameworks(COF)offer a novel way to create highly efficient electrocatalysts due to their tunable composition,structure and surface area.Herein,we report a high-efficiency bifunctional electrocatalyst comprising Co nanoparticles embedded within N-doped carbons(Co@NCs)for Zn-air batteries(ZABs).The Co@NC is yielded via the coordination of a triazine COF with Co-containing precursors and subsequent calcination under inert atmosphere.The as-prepared Co@NC exhibits remarkable ORR/OER performance and great potential in rechargeable ZABs.The liquid ZAB constructed with Co@NC provides both high specific capacity and power density.Remarkably,the ZAB exhibits a voltage gap of 0.8 V during discharge and charge cycles and high stability for 220 h compared to the Pt/C-assembled battery.This strategy for regulating electrocatalytic activities of COF-derived carbon materials could be expanded for creating various carbon catalysts.展开更多
We report a new facile light-induced strategy to disperse micron-sized aggregated bulk covalent organic frameworks(COFs)into isolated COFs nanoparticles.This was achieved by a series of metal-coordinated COFs,namely C...We report a new facile light-induced strategy to disperse micron-sized aggregated bulk covalent organic frameworks(COFs)into isolated COFs nanoparticles.This was achieved by a series of metal-coordinated COFs,namely COF-909-Cu,-Co or-Fe,where for the first time the diffusio-phoretic propulsion was utilized to design COF-based micro/nanomotors.The mechanism studies revealed that the metal ions decorated in the COF-909 backbone could promote the separation of electron and holes and trigger the production of sufficient ionic and reactive oxygen species under visible light irradiation.In this way,strong light-induced self-diffusiophoretic effect is achieved,resulting in good dispersion of COFs.Among them,COF-909-Fe showed the highest dispersion performance,along with a drastic decrease in particle size from 5μm to500 nm,within only 30 min light irradiation,which is inaccessible by using traditional magnetic stirring or ultrasonication methods.More importantly,benefiting from the outstanding dispersion efficiency,COF-909-Fe micro/nanomotors were demonstrated to be efficient in photocatalytic degradation of tetracycline,about 8 times faster than using traditional magnetic stirring method.This work opens up a new avenue to prepare isolated nanosized COFs in a high-fast,simple,and green manner.展开更多
Industrial growth in recent years led to air pollution and an increase in concentration of hazardous gases such as O<sub>3</sub> and NO. Developing new materials is important to detect and reduce air pollu...Industrial growth in recent years led to air pollution and an increase in concentration of hazardous gases such as O<sub>3</sub> and NO. Developing new materials is important to detect and reduce air pollutants. While catalytic decomposition and zeolites are traditional ways used to reduce the amount of these gases. We need to develop and explore new promising materials. Covalent organic framework (COF) has become an attractive platform for researcher due to its extended robust covalent bonds, porosity, and crystallinity. In this study, first principal calculations were performed for gases adsorption using COFs containing nitrogen and π-bonds. Different building blocks (BBs) and linkers (LINKs/LINK1 & LINK2) were investigated by means of density functional theory (DFT) calculations with B3LYP and 3-21G basis sets to calculate the binding energies of gases @COF systems. Electrostatic potential maps (ESPM), Mulliken charges and non-covalent interaction (NCI) are used to understand the type of interactions between gas and COFs fragments. O3 was found to bind strongly with COF system in comparison with NO which could make COF a useful selective material for mixed gases environment for sensing and removal application.展开更多
随着电子产品小型化和液晶显示器IC封装技术的快速发展,COF(Chip on Film)技术的应用市场得到了迅速扩大。按照片式减成方法制作的线宽/线距在50μm/50μm以下的精细线路,常常会出现导线过细或断线等缺陷。论文采用目前先进的RTR(Roll t...随着电子产品小型化和液晶显示器IC封装技术的快速发展,COF(Chip on Film)技术的应用市场得到了迅速扩大。按照片式减成方法制作的线宽/线距在50μm/50μm以下的精细线路,常常会出现导线过细或断线等缺陷。论文采用目前先进的RTR(Roll to Roll)生产工艺,选用12μm铜箔、15μm干膜,使用玻璃菲林进行图形转移,并运用正交设计法对影响精细线路品质的曝光能量、显影速度、蚀刻速度、蚀刻压力等因素进行优化试验。以精细线路的线宽和蚀刻系数作为评价标准,找出最佳参数,并分析了蚀刻压力对精细线路的影响机理。将最优化参数应用到生产中,使25μm/25μm的COF精细线路的成品率提高20%。最终实现25μm/25μm的COF精细线路的小批量生产。展开更多
随着晶片封装技术的不断发展,要求基板线路的精细度越来越高,50μm/50μm以下的COF(Chip on Flex)精细线路将成为未来发展的主流,但精细线路的制作一直是FPC生产上的难点,当线路在50μm/50μm以下时,成品率较低难以满足量产化的要求。...随着晶片封装技术的不断发展,要求基板线路的精细度越来越高,50μm/50μm以下的COF(Chip on Flex)精细线路将成为未来发展的主流,但精细线路的制作一直是FPC生产上的难点,当线路在50μm/50μm以下时,成品率较低难以满足量产化的要求。本文中以公司的现有设备为基础,通过传统片式生产线,选用12μm铜箔作为基材、15μm干膜作为抗蚀层,使用玻璃菲林进行图形转移,同时通过表面处理、改变曝光、显影和蚀刻参数等,对30μm/25μm的精细线路进行研制,并通过金相切片测试仪、三次元测试仪、AOI(Automatic Optical Inspector)等对产品进行检查。结果显示,线宽、蚀刻系数和成品率都能达到小批量生产的要求。展开更多
随着各种短、小、轻、薄液晶显示器越来越受到人们的欢迎，COF（chip on film）封装技术也得到了较快的发展。COF技术不仅仅是精细线路的制作和芯片的连接，而且该技术与其他的相关课题有着密切的联系。本文主要介绍了精细化线路COF基...随着各种短、小、轻、薄液晶显示器越来越受到人们的欢迎，COF（chip on film）封装技术也得到了较快的发展。COF技术不仅仅是精细线路的制作和芯片的连接，而且该技术与其他的相关课题有着密切的联系。本文主要介绍了精细化线路COF基板的制作技术现状和未来需要进一步解决的相关技术。展开更多
基金supported by the Natural Science Foundation of Shandong Province(ZR2019PB013)the Training Program of Innovation and Entrepreneurship for Undergraduates of Liaocheng University(CXCY2022277)。
文摘Precise modulation of the structure and composition of electrocatalysts is critical for promoting the kinetically sluggish process of oxygen reduction reaction(ORR)and oxygen evolution reaction(OER).Covalent organic frameworks(COF)offer a novel way to create highly efficient electrocatalysts due to their tunable composition,structure and surface area.Herein,we report a high-efficiency bifunctional electrocatalyst comprising Co nanoparticles embedded within N-doped carbons(Co@NCs)for Zn-air batteries(ZABs).The Co@NC is yielded via the coordination of a triazine COF with Co-containing precursors and subsequent calcination under inert atmosphere.The as-prepared Co@NC exhibits remarkable ORR/OER performance and great potential in rechargeable ZABs.The liquid ZAB constructed with Co@NC provides both high specific capacity and power density.Remarkably,the ZAB exhibits a voltage gap of 0.8 V during discharge and charge cycles and high stability for 220 h compared to the Pt/C-assembled battery.This strategy for regulating electrocatalytic activities of COF-derived carbon materials could be expanded for creating various carbon catalysts.
基金supported by Huazhong University of Science and Technology(No.2021XXJS036,3004013134)National Natural Science Foundation of China(No.51903099,82002879,22102059)+2 种基金the Innovation and Talent Recruitment Base of New Energy Chemistry and Device(No.B21003)China Postdoctoral Science Foundation(2021M692475,2021T140524,XJ2021037)support from the 100 Talents Program of the Hubei Provincial Government。
文摘We report a new facile light-induced strategy to disperse micron-sized aggregated bulk covalent organic frameworks(COFs)into isolated COFs nanoparticles.This was achieved by a series of metal-coordinated COFs,namely COF-909-Cu,-Co or-Fe,where for the first time the diffusio-phoretic propulsion was utilized to design COF-based micro/nanomotors.The mechanism studies revealed that the metal ions decorated in the COF-909 backbone could promote the separation of electron and holes and trigger the production of sufficient ionic and reactive oxygen species under visible light irradiation.In this way,strong light-induced self-diffusiophoretic effect is achieved,resulting in good dispersion of COFs.Among them,COF-909-Fe showed the highest dispersion performance,along with a drastic decrease in particle size from 5μm to500 nm,within only 30 min light irradiation,which is inaccessible by using traditional magnetic stirring or ultrasonication methods.More importantly,benefiting from the outstanding dispersion efficiency,COF-909-Fe micro/nanomotors were demonstrated to be efficient in photocatalytic degradation of tetracycline,about 8 times faster than using traditional magnetic stirring method.This work opens up a new avenue to prepare isolated nanosized COFs in a high-fast,simple,and green manner.
文摘Industrial growth in recent years led to air pollution and an increase in concentration of hazardous gases such as O<sub>3</sub> and NO. Developing new materials is important to detect and reduce air pollutants. While catalytic decomposition and zeolites are traditional ways used to reduce the amount of these gases. We need to develop and explore new promising materials. Covalent organic framework (COF) has become an attractive platform for researcher due to its extended robust covalent bonds, porosity, and crystallinity. In this study, first principal calculations were performed for gases adsorption using COFs containing nitrogen and π-bonds. Different building blocks (BBs) and linkers (LINKs/LINK1 & LINK2) were investigated by means of density functional theory (DFT) calculations with B3LYP and 3-21G basis sets to calculate the binding energies of gases @COF systems. Electrostatic potential maps (ESPM), Mulliken charges and non-covalent interaction (NCI) are used to understand the type of interactions between gas and COFs fragments. O3 was found to bind strongly with COF system in comparison with NO which could make COF a useful selective material for mixed gases environment for sensing and removal application.
文摘随着电子产品小型化和液晶显示器IC封装技术的快速发展,COF(Chip on Film)技术的应用市场得到了迅速扩大。按照片式减成方法制作的线宽/线距在50μm/50μm以下的精细线路,常常会出现导线过细或断线等缺陷。论文采用目前先进的RTR(Roll to Roll)生产工艺,选用12μm铜箔、15μm干膜,使用玻璃菲林进行图形转移,并运用正交设计法对影响精细线路品质的曝光能量、显影速度、蚀刻速度、蚀刻压力等因素进行优化试验。以精细线路的线宽和蚀刻系数作为评价标准,找出最佳参数,并分析了蚀刻压力对精细线路的影响机理。将最优化参数应用到生产中,使25μm/25μm的COF精细线路的成品率提高20%。最终实现25μm/25μm的COF精细线路的小批量生产。
文摘随着晶片封装技术的不断发展,要求基板线路的精细度越来越高,50μm/50μm以下的COF(Chip on Flex)精细线路将成为未来发展的主流,但精细线路的制作一直是FPC生产上的难点,当线路在50μm/50μm以下时,成品率较低难以满足量产化的要求。本文中以公司的现有设备为基础,通过传统片式生产线,选用12μm铜箔作为基材、15μm干膜作为抗蚀层,使用玻璃菲林进行图形转移,同时通过表面处理、改变曝光、显影和蚀刻参数等,对30μm/25μm的精细线路进行研制,并通过金相切片测试仪、三次元测试仪、AOI(Automatic Optical Inspector)等对产品进行检查。结果显示,线宽、蚀刻系数和成品率都能达到小批量生产的要求。
