Bilayer Nanomesh Structures for Transparent Recording and Stimulating Microelectrodes
Bilayer Nanomesh Structures for Transparent Recording and Stimulating Microelectrodes
复制标题
DOI：
10.1002/adfm.201704117
复制
发表时间：
2017-12-22
影响因子：
19
通讯作者：
Fang, Hui
中科院分区：
文献类型：
--
作者：
Qiang, Yi;Seo, Kyung Jin;Fang, Hui
纳米金属已经成为未来软生物电子学的一种很有前途的生物相容电极材料。然而，金属/电解液界面本质上是电容的，严重限制了它们的电化学性能，特别是对鳞片电极来说，这是高分辨率脑成像所必需的。在这里，一种创新的双层纳米网格方法被展示来解决这一限制，同时保持纳米网格的优势。在金纳米网格模板上电镀低阻抗涂层，在1 kHz下获得了30K的阻抗和1 mC cm(-2)的电荷注入极限，分别比未涂覆的电极提高了4.3倍和12.8倍，同时在550 nm处保持了约70%的透明度。透过率、阻抗、电荷注入极限、循环电荷注入和光诱导伪影的系统表征表明，双层纳米网格微电极具有令人鼓舞的性能。本文提出的双层纳米网格方法有望使下一代大规模透明生物电子学在生物学中具有广泛的实用价值。
Nanomeshed forms of metal have emerged as a promising biocompatible electrode material for future soft bioelectronics. However, metal/electrolyte interfaces are intrinsically capacitive, severely limiting their electrochemical performance, especially for scaled electrodes, which are essential for high-resolution brain mapping. Here, an innovative bilayer nanomesh approach is demonstrated to address this limitation while preserving the nanomesh advantage. Electroplating low-impedance coatings on a gold nanomesh template achieves an impedance < 30 k at 1 kHz and a charge injection limit of 1 mC cm(-2) for 80 x 80 mu m(2) microelectrodes, a 4.3x and 12.8x improvement over uncoated electrodes, respectively, while maintaining a transparency of approximate to 70% at 550 nm. Systematic characterization of transmittance, impedance, charge injection limits, cyclic charge injection, and light-induced artifacts reveal an encouraging performance of the bilayer nanomesh microelectrodes. The bilayer nanomesh approach presented here is expected to enable next-generation large-scale transparent bioelectronics with broad utility in biology.