Polymer matrix composites with high dielectric constants and low dielectric losses are in high demand for flexible electronics.However,simultaneously satisfying these requirements poses a significant scientific challe...Polymer matrix composites with high dielectric constants and low dielectric losses are in high demand for flexible electronics.However,simultaneously satisfying these requirements poses a significant scientific challenge owing to the intrinsic trade-off relationship.Herein,we utilized the in situ controllable reduction of graphene oxide(GO)within a poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene)(P(VDF-Tr FE-CFE))matrix to regulate the dielectric properties.The as-obtained composite exhibited a high relative dielectric constant of 1415coupled with a low loss tangent of 0.380 at 100 Hz.Experimental and theoretical studies indicate that the increased degree of electron conjugation and conductivity of the reduced GO(RGO)are responsible for the high-k.The constrained reduction degree of GO,combined with its homogeneous dispersion in the polymer matrix,effectively suppresses long-range charge carrier migration,thereby minimizing dielectric loss.This novel strategy could be successfully applied to both organic and aqueous systems.Furthermore,a high-performance flexible capacitive proximity sensor was exemplified by the optimization of both the dielectric layer and electrode pattern,exhibiting excellent sensitivity and stability.The fundamental mechanisms elucidated in this study provide crucial design principles for developing dielectric PMCs with tailored properties,thereby opening new avenues for advanced flexible electronic applications.展开更多
[目的]对“十四五”时期省级层面数字健康政策进行梳理和量化评价,为政策制定和完善提供对策建议。[方法]采用ROST CM 6.0软件对11份数字健康政策进行文本挖掘,构建政策一致性(Policy Modeling Consistency,PMC)指数模型,包含9个一级变...[目的]对“十四五”时期省级层面数字健康政策进行梳理和量化评价,为政策制定和完善提供对策建议。[方法]采用ROST CM 6.0软件对11份数字健康政策进行文本挖掘,构建政策一致性(Policy Modeling Consistency,PMC)指数模型,包含9个一级变量和39个二级变量,并对政策文本进行量化分析。[结果]11项政策的PMC指数均值为6.41,其中3项是优秀政策,8项是可接受政策。一级变量X_(1)政策性质(0.89)、X_(8)政策功能(0.87)、X_(9)政策评价(0.86)评分较高;X_(2)政策时效(0.33)、X_(3)发布机构(0.34)、X_(5)政策对象(0.73)、X_(7)政策内容(0.76)评分较低。[结论]我国省级层面数字健康政策仍有一定的提升空间。建议强化政策短期突破、中期布局与长期引领的有机衔接,建立政府主导、多元协同、共建共享的治理体系,着力提升政策体系的均衡性与完整性,激发区域创新发展活力。展开更多
基金financially supported by the Innovation and Technology Commission of the Hong Kong SAR Government(No.MRP/020/21)Hong Kong Polytechnic University(No.847A)+1 种基金RI-Wear Seed Fund of Poly U(1-CD8J)Start-up Fund of Poly U(1-BD49)。
文摘Polymer matrix composites with high dielectric constants and low dielectric losses are in high demand for flexible electronics.However,simultaneously satisfying these requirements poses a significant scientific challenge owing to the intrinsic trade-off relationship.Herein,we utilized the in situ controllable reduction of graphene oxide(GO)within a poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene)(P(VDF-Tr FE-CFE))matrix to regulate the dielectric properties.The as-obtained composite exhibited a high relative dielectric constant of 1415coupled with a low loss tangent of 0.380 at 100 Hz.Experimental and theoretical studies indicate that the increased degree of electron conjugation and conductivity of the reduced GO(RGO)are responsible for the high-k.The constrained reduction degree of GO,combined with its homogeneous dispersion in the polymer matrix,effectively suppresses long-range charge carrier migration,thereby minimizing dielectric loss.This novel strategy could be successfully applied to both organic and aqueous systems.Furthermore,a high-performance flexible capacitive proximity sensor was exemplified by the optimization of both the dielectric layer and electrode pattern,exhibiting excellent sensitivity and stability.The fundamental mechanisms elucidated in this study provide crucial design principles for developing dielectric PMCs with tailored properties,thereby opening new avenues for advanced flexible electronic applications.
文摘[目的]对“十四五”时期省级层面数字健康政策进行梳理和量化评价,为政策制定和完善提供对策建议。[方法]采用ROST CM 6.0软件对11份数字健康政策进行文本挖掘,构建政策一致性(Policy Modeling Consistency,PMC)指数模型,包含9个一级变量和39个二级变量,并对政策文本进行量化分析。[结果]11项政策的PMC指数均值为6.41,其中3项是优秀政策,8项是可接受政策。一级变量X_(1)政策性质(0.89)、X_(8)政策功能(0.87)、X_(9)政策评价(0.86)评分较高;X_(2)政策时效(0.33)、X_(3)发布机构(0.34)、X_(5)政策对象(0.73)、X_(7)政策内容(0.76)评分较低。[结论]我国省级层面数字健康政策仍有一定的提升空间。建议强化政策短期突破、中期布局与长期引领的有机衔接,建立政府主导、多元协同、共建共享的治理体系,着力提升政策体系的均衡性与完整性,激发区域创新发展活力。
