【科学网】科学家发现具有大压电响应的可生物降解铁电分子晶体

近日，东南大学的熊仁根及其研究小组与美国马里兰大学的Shenqiang Ren以及南京大学的顾宁等人合作并取得一项新进展。经过不懈努力，他们发现具有大压电响应的可生物降解铁电分子晶体。相关研究成果已于2024年3月29日在国际权威学术期刊《科学》上发表。

该研究团队发现分子晶体HOCH2(CF2)3CH2OH[2,2,3,3,4,4-六氟戊烷-1,5-二醇(HFPD)]具有较高的压电性，在无极化条件下压电系数d33约为138皮库伦/牛顿，压电电压常数g33约为2450 × 10-3伏特/牛顿，具有良好的生物细胞相容性，在生理环境中具有良好的生物降解和生物安全性。HFPD可与聚乙烯醇复合，形成d33为34.3皮库仑/牛顿的柔性压电薄膜。该材料充分展现了分子晶体独特的压电特性，其迷人之处使其有望应用于瞬态可植入机电设备。

据悉，瞬时可植入压电材料是生物传感、药物输送、组织再生、抗菌和肿瘤治疗的理想材料。为了在人体中使用，它们必须表现出灵活性、生物相容性和生物可降解性。这些要求对传统的无机压电氧化物和压电聚合物来说是一个挑战。

附：英文原文

Title: Biodegradable ferroelectric molecular crystal with large piezoelectric response

Author: Han-Yue Zhang, Yuan-Yuan Tang, Zhu-Xiao Gu, Peng Wang, Xiao-Gang Chen, Hui-Peng Lv, Peng-Fei Li, Qing Jiang, Ning Gu, Shenqiang Ren, Ren-Gen Xiong

Issue&Volume: 2024-03-29

Abstract: 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)3CH2OH [2,2,3,3,4,4-hexafluoropentane-1,5-diol (HFPD)] with a large piezoelectric coefficient d33 of ~138 picocoulombs per newton and piezoelectric voltage constant g33 of ~2450 × 10-3volt-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 d33 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.

DOI: 10.1126/science.adj1946

Source: https://www.science.org/doi/10.1126/science.adj1946

期刊信息

Science：《科学》，创刊于1880年。隶属于美国科学促进会，最新IF：63.714