材料科学
聚苯胺
表面改性
离子键合
纳米技术
离子强度
膜
导电聚合物
二极管
化学工程
聚合物
光电子学
离子
化学
水溶液
有机化学
聚合
工程类
复合材料
生物化学
作者
Gregorio Laucirica,María Eugenia Toimil‐Molares,C. Trautmann,Waldemar A. Marmisollé,Omar Azzaroni
标识
DOI:10.1021/acsami.0c05102
摘要
Solid-state nanochannels have attracted substantial attention of the scientific community due to their remarkable control of ionic transport and the feasibility to regulate the iontronic output by different stimuli. Most of the developed nanodevices are subjected to complex modification methods or show functional responsiveness only in moderate-ionic-strength solutions. Within this project, we present a nanofluidic device with enhanced ionic current rectification properties attained by a simple one-step functionalization of single bullet-shaped polyethylene terephthalate (PET) nanochannels with polyaniline (PANI) that can work in high-ionic-strength solutions. The integration of PANI also introduces a broad pH sensitivity, which makes it possible to modulate the ionic transport behavior between anion-selective and cation-selective regimes depending on the pH range. Since PANI is an electrochemically active polymer, ionic transport also becomes dependent on the presence of redox stimuli in solution. We demonstrate that PANI-functionalized single-nanochannel membranes function as an efficient salinity gradient-based energy conversion device even in acidic concentrated salt solutions, opening the door to applications under a variety of novel operating conditions.
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