Oxidant aggregate-induced porosity in vapour-deposited polymer films and correlated impact on electrochemical properties
Oxidant aggregate-induced porosity in vapour-deposited polymer films and correlated impact on electrochemical properties
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气相沉积聚合物薄膜中氧化剂聚集引起的孔隙率及其对电化学性能的相关影响
DOI：
10.1080/10610278.2019.1623892
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发表时间：
2019
影响因子：
3.3
通讯作者：
Andrew, Trisha L.
中科院分区：
文献类型：
--
作者：
Viola, Wesley;Zhang, Lushuai;Andrew, Trisha L.
持久掺杂的共轭聚合物由于其与离子电流和电子电流相互作用的独特能力，是能量存储、柔性电子产品和生物传感器不可或缺的一部分。为了最大限度地提高这些领域设备的性能，研究重点是控制材料特性，以优化两种类型电荷载体的电导率。挑战在于改善离子传输，这通常是氧化还原过程中的限速步骤，而不牺牲电子电导率或所需的机械性能。在这里，我们报告了气相沉积导电聚合物薄膜中纳米结构的控制，并将薄膜结构的变化与最终的电化学性能相关联。通过利用反应气相沉积过程中氧化剂纳米聚集体的生长来实现结构控制。相对于致密薄膜，多孔薄膜在电化学测试中表现出更快的响应时间。扫描速率分析证实了扩散限制充电动力学的转变，并证明了孔隙率在通过电活性聚合物的离子传输中发挥的重要作用。有利的是，连续聚合物网络在纳米结构膜中保持明显，确保保持高电子电导率以及高孔隙率。我们发现，即使聚合物厚度增加十倍，这种增强的性能仍然保留。本文报道的薄膜可以用作柔性电化学装置中的坚固电极。
Persistently doped conjugated polymers are integral for energy storage, flexible electronics, and biosensors due to their unique ability to interact with both ionic and electronic currents. To maximise the performance of devices across these fields, research has focused on controlling material properties to optimise conductivities of both types of charge carriers. The challenge lies in improving ionic transport, which is typically the rate-limiting step in redox processes, without sacrificing electronic conductivity or desirable mechanical properties. Here we report on control of nanostructure in vapour deposited conducting polymer films and correlate changes in film structure with resulting electrochemical properties. Structural control is enabled by exploiting the growth of oxidant nanoaggregates during the reactive vapour deposition process. Relative to dense films, porous films exhibit faster response times in electrochemical testing. Scan rate analysis confirms a transition away from diffusion-limited charging kinetics and demonstrates the important role that porosity can play in ion transport through electroactive polymers. Advantageously, continuous polymer networks remain evident in nanostructured films, ensuring that high electronic conductivities are maintained along with high porosity. We find that such enhanced properties are retained even as polymer thickness increases ten-fold. The films reported herein may serve as robust electrodes in flexible electrochemical devices.
影响因子：
17.1
作者：
D'Arcy, Julio M.;El-Kady, Maher F.;Kaner, Richard B.
通讯作者：
Kaner, Richard B.
影响因子：
4
作者：
Im, Sung Gap;Gleason, Karen K.;Olivetti, Elsa A.
通讯作者：
Olivetti, Elsa A.
通过水解辅助气相聚合制备金属氧化物辅助 PEDOT 纳米结构用于储能
DOI：
--
发表时间：
2018
期刊：
影响因子：
--
作者：
Hongmin Wang;Yifan Diao;M. Rubin;L. Santino;Yang Lu;Julio M. D’Arcy
通讯作者：
Julio M. D’Arcy