用叉指电极阵列和纳米天平原位分析磺化聚醚酮薄膜的水合作用和离子导电性

IF 0.8 Q4 INSTRUMENTS & INSTRUMENTATION Journal of Sensors and Sensor Systems Pub Date : 2022-02-23 DOI:10.5194/jsss-11-51-2022
H. Wulfmeier, Niklas Warnecke, L. Pasquini, H. Fritze, P. Knauth
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引用次数: 1

摘要

摘要质子导电聚合物,如磺化聚醚醚酮(SPEEK),具有很大的工业价值。这种质子交换膜显示出吸收水和水蒸气的高趋势。水的加入不仅会导致质量和尺寸的变化,还会导致电导率的几个数量级的变化。Bothproperty对材料的潜在应用有很大影响,因此必须精确了解。由于水合作用受到扩散控制,薄膜的行为可能与大块试样不同。然而,确定薄膜样品中发生的小质量变化是非常具有挑战性的。在这项工作中,提出了一种新的测量装置来同时表征聚合物薄膜的质量变化和电导率。基于在厚度剪切模式(TSM)下工作的高精度压电谐振器,利用具有纳米探针的谐振压电光谱(RPS)测量了质量变化。这种纳米天平的质量分辨率为±7.9 电化学阻抗谱和叉指电极阵列用于电导率测量。通过比较两种不同磺化度(DS)的SPEEK薄膜,验证了该方法。测量设置中的相对湿度(RH)在~2的范围内逐步变化 % < RH < ∼ 85 %. 对于两种材料组成,DS = 0.5和DS = 0.9,给出并讨论了质量吸收、水合数和质子电导率随RH的变化。这种新设计的实验装置允许对上述性质进行原位表征;它不仅可以监测静态数据,还可以监测水合过程的动力学。据作者所知,这是第一个同时原位测量装置,用于同时传感聚合物薄膜材料水合引起的质量和电导率变化。
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In situ analysis of hydration and ionic conductivity of sulfonated poly(ether ether ketone) thin films using an interdigitated electrode array and a nanobalance
Abstract. Proton-conducting polymers, such as sulfonated poly(ether ether ketone) (SPEEK), are of great industrial interest. Such proton exchange membranes show high tendencies for water and water vapor uptake. The incorporation of water not only leads to mass and dimensional changes, but also to changes in conductivity by several orders of magnitude. Both properties highly impact the potential application of the materials and, therefore, have to be known precisely. As hydration is diffusion controlled, thin films may behave differently to bulk specimens. However, the determination of small mass changes occurring in thin-film samples is very challenging. In this work, a new measurement setup is presented to simultaneously characterize the mass change and the conductivity of thin polymer films. The mass change is measured by resonant piezoelectric spectroscopy (RPS) with a nanobalance, which is based on high-precision piezoelectric resonators operating in thickness-shear mode (TSM). The mass resolution of this nanobalance is ±7.9 ng. Electrochemical impedance spectroscopy and an interdigitated electrode array are used for conductivity measurements. The approach is validated by comparing two SPEEK films with different degrees of sulfonation (DS). The relative humidity (RH) in the measurement setup was changed stepwise within the range ∼ 2 % < RH < ∼ 85 %. For both material compositions, DS = 0.5 and DS = 0.9, the mass uptake, the hydration number and the proton conductivity are presented and discussed depending on RH. This newly designed experimental setup allows for in situ characterization of the properties mentioned above; it can monitor not only the data for the stationary state, but also the dynamics of the hydration. To the authors' knowledge this is the first simultaneous and in situ measurement device for simultaneously sensing mass and conductivity change due to hydration of polymeric thin-film materials.
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来源期刊
Journal of Sensors and Sensor Systems
Journal of Sensors and Sensor Systems INSTRUMENTS & INSTRUMENTATION-
CiteScore
2.30
自引率
10.00%
发文量
26
审稿时长
23 weeks
期刊介绍: Journal of Sensors and Sensor Systems (JSSS) is an international open-access journal dedicated to science, application, and advancement of sensors and sensors as part of measurement systems. The emphasis is on sensor principles and phenomena, measuring systems, sensor technologies, and applications. The goal of JSSS is to provide a platform for scientists and professionals in academia – as well as for developers, engineers, and users – to discuss new developments and advancements in sensors and sensor systems.
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