Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Bredgatan 33, Norrköping, 60174, Sweden.
Bioelectronics Materials and Devices Laboratory, Central European Institute of Technology, Brno University of Technology, Purkyňova 123, Brno, 61200, Czech Republic.
Adv Healthc Mater. 2024 Sep;13(24):e2302400. doi: 10.1002/adhm.202302400. Epub 2024 May 27.
Platinum is the most widespread electrode material used for implantable biomedical and neuroelectronic devices, motivating exploring ways to improve its performance and understand its fundamental properties. Using reactive magnetron sputtering, PtO is prepared, which upon partial reduction yields a porous thin-film form of platinum with favorable properties, notably record-low impedance values outcompeting other reports for platinum-based electrodes. It is established that its high electrochemical capacitance scales with thickness, in the way of volumetric capacitor materials like IrO and poly(3,4-ethylenedioxythiophene), PEDOT. Unlike these two well-known analogs, however, it is found that PtO capacitance is not caused by reversible pseudofaradaic reactions but rather due to high surface area. In contrast to IrO, PtO is not a reversible valence-change oxide, but rather a porous form of platinum. The findings show that this oxygen-containing form of Pt can place Pt electrodes on a level competitive with IrO and PEDOT. Due to its relatively low cost and ease of preparation, PtO can be a good choice for microfabricated bioelectronic devices.
铂是最广泛应用于植入式生物医学和神经电子设备的电极材料，这促使人们探索提高其性能和理解其基本特性的方法。使用反应磁控溅射制备了 PtO，部分还原后得到具有良好性能的多孔薄膜形式的铂，特别是记录低阻抗值优于其他基于铂的电极的报告。研究表明，其高电化学电容与其厚度成正比，与 IrO 和聚(3,4-乙撑二氧噻吩)PEDOT 等体积电容器材料相似。然而，与这两种众所周知的类似物不同，发现 PtO 的电容不是由可逆赝法拉第反应引起的，而是由于高表面积。与 IrO 不同，PtO 不是可逆的价态变化氧化物，而是铂的多孔形式。研究结果表明，这种含氧形式的 Pt 可以使 Pt 电极与 IrO 和 PEDOT 竞争。由于其相对较低的成本和易于制备，PtO 可以成为微制造生物电子设备的一个不错的选择。
