Biodegradable ferroelectric molecular crystal with large piezoelectric response

• 成果类型: Article
• 署名作者: Zhang, Han-Yue; Tang, Yuan-Yuan; Gu, Zhu-Xiao; Wang, Peng; Chen, Xiao-Gang; Lv, Hui-Peng; Li, Peng-Fei; Jiang, Qing; Gu, Ning; Ren, Shenqiang; Xiong, Ren-Gen
• 署名单位: Southeast University - China; Nanchang University; Nanjing University; Nanjing University; University System of Maryland; University of Maryland College Park
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12044
• DOI: 10.1126/science.adj1946
• 发表日期: 2024-03-29
• 页码: 1492-1498
• 关键词: room-temperature ferroelectricity; electromechanical coupling factor; total-energy calculations; elastic band method; giant piezoelectricity; perovskite; polarization; BEHAVIOR; films; nanoconfinement

摘要

Transient implantable piezoelectric materials are desirable for biosensing, drug delivery, tissue regeneration, and antimicrobial and tumor therapy. For use in the human body, they must show flexibility, biocompatibility, and biodegradability. These requirements are challenging for conventional inorganic piezoelectric oxides and piezoelectric polymers. We discovered high piezoelectricity in a molecular crystal HOCH2(CF2)(3)CH2OH [2,2,3,3,4,4-hexafluoropentane-1,5-diol (HFPD)] with a large piezoelectric coefficient d(33) of similar to 138 picocoulombs per newton and piezoelectric voltage constant g(33) of similar to 2450 x 10(-3) volt-meters per newton under no poling conditions, which also exhibits good biocompatibility toward biological cells and desirable biodegradation and biosafety in physiological environments. HFPD can be composite with polyvinyl alcohol to form flexible piezoelectric films with a d(33) of 34.3 picocoulombs per newton. Our material demonstrates the ability for molecular crystals to have attractive piezoelectric properties and should be of interest for applications in transient implantable electromechanical devices.