无机材料学报2026，Vol.41Issue(4)：462-468,中插5,8.DOI:10.15541/jim20250158
粉末热压法制备高性能n型PVDF/Ag2Se自支撑柔性复合热电薄膜
High-performance n-type PVDF/Ag2Se Free-standing Flexible Composite Thermoelectric Films Fabricated by Powder Hot-pressing
摘要
Abstract
Rapid development of applications in wearable devices,microelectronics,and internet of things has created an urgent demand for free-standing flexible thermoelectric films.Currently,research on n-type free-standing flexible thermoelectric films significantly lags behind,and there is an urgent need to enhance film performance through the optimization of preparation processes.In this study,high-performance n-type poly(vinylidene fluoride)/silver selenide(PVDF/Ag2Se)free-standing flexible thermoelectric composite films were developed using a simple and efficient powder hot-pressing method.The high-temperature and high-pressure conditions during hot pressing induced recrystallization and grain growth of Ag2Se,effectively reducing grain boundary density,significantly decreasing carrier scattering and interfacial resistance,thereby simultaneously enhancing carrier mobility,electrical conductivity and Seebeck coefficient.Meanwhile,the melted PVDF filled interstices of the Ag2Se conductive network during hot pressing,substantially improving material flexibility while increasing density.Experimental results demonstrate that the hot-pressed sample with 80%(in mass)Ag2Se exhibits outstanding room-temperature thermoelectric performance with an electrical conductivity of 277.0 S·cm-1 and a Seebeck coefficient of-135 μV·K-1,and thermoelectric power factor(PF)and estimated figure of merit(ZT)reach 509 μW·m-1·K-2 and 0.26,respectively.This performance not only significantly surpasses that of previously reported PVDF/Ag2Se free-standing films but also ranks among the highest for all reported Ag2Se-based organic/inorganic free-standing flexible thermoelectric films.Furthermore,mechanical tests reveal that the film maintains over 92%of its original conductivity after 500 bending cycles at a 5 mm radius,while exhibiting a maximum tensile strain four times greater than pure Ag2Se films.This study provides a novel strategy for synergistic optimization of thermoelectric performance and mechanical flexibility in organic/inorganic composite thermoelectric materials.关键词
硒化银/复合热电薄膜/自支撑/柔性/热压Key words
silver selenide/composite thermoelectric film/free-standing/flexible/hot-pressing分类
通用工业技术引用本文复制引用
徐子硕,胡悦娟,胡宇晨,陈立东,姚琴..粉末热压法制备高性能n型PVDF/Ag2Se自支撑柔性复合热电薄膜[J].无机材料学报,2026,41(4):462-468,中插5,8.基金项目
国家自然科学基金(U23A20685) （U23A20685）
国家重点研发计划(2024YFF0505900) National Natural Science Foundation of China(U23A20685) （2024YFF0505900）
National Key Research and Development Program of China(2024YFF0505900) （2024YFF0505900）
