Genetically Induced In Situ‐Poling for Piezo‐Active Biohybrid Nanowires
Genetically Induced In Situ‐Poling for Piezo‐Active Biohybrid Nanowires
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DOI：
10.1002/adma.201805597
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发表时间：
2018-12
影响因子：
29.4
通讯作者：
Stefan Kilper;Timotheus Jahnke;M. Aulich;Z. Burghard;D. Rothenstein;J. Bill
中科院分区：
文献类型：
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作者：
Stefan Kilper;Timotheus Jahnke;M. Aulich;Z. Burghard;D. Rothenstein;J. Bill
多晶压电活性材料只有在具有定向晶体方向和排列的本征偶极矩的粒子组成时才表现出高的宏观压电响应。对于铁电材料，偶极子的合成后排列通常是通过电极化过程来实现的。然而，有许多技术上有趣的非铁电压电活性材料，如氧化锌（ZnO）。这些材料在制造过程中要求其本征偶极子的排列。因此，必须开发原位极化技术。本研究利用转基因M13噬菌体模板产生力场，直接控制ZnO偶极子极化。通过对M13噬菌体模板进行基因修饰，ZnO/M13噬菌体杂交纳米线的压电响应比基于未修饰的M13野生型（wt）噬菌体模板的杂交纳米线提高了一倍。因此，由取向ZnO纳米晶体组成的压电活性结构域的形成是由基因修饰直接诱导的。通过将单个M13噬菌体的纤维状结构与ZnO的生物增强机电性能相结合，制备出长度≈1.1µm，厚度≈63.5 nm的杂交纳米线，用于转基因M13噬菌体模板，其压电系数高达d33 = 7.8 pm V−1。
Polycrystalline piezo‐active materials only exhibit a high macroscopic piezoresponse if they consist of particles with oriented crystal directions and aligned intrinsic dipole moments. For ferroelectric materials, the postsynthesis alignment of the dipoles is generally achieved by electric poling procedures. However, there are numerous technically interesting non‐ferroelectric piezo‐active materials like zinc oxide (ZnO). These materials demand the alignment of their intrinsic dipoles during the fabrication process. Therefore, in situ‐poling techniques have to be developed. This study utilizes genetically modified M13 phage templates for the generation of force fields, which directly control the ZnO dipole poling. By genetic modification of M13 phage template, the piezoelectric response of the ZnO/M13 phage hybrid nanowire is doubled compared to the hybrid nanowire based on unmodified M13 wild type (wt) phage templates. Thus, the formation of piezo‐active domains consisting of oriented ZnO nanocrystals is directly induced by the genetic modification. By the combination of the fiber‐like structure of individual M13 phages with the bioenhanced electromechanical properties of ZnO, hybrid nanowires with a length of ≈1.1 µm and a thickness of ≈63.5 nm are fabricated with a high piezoelectric coefficient of up to d33 = 7.8 pm V−1 for genetically modified M13 phage templates.