Abstract Graphene oxide membranes (GOMs) have become promising materials in several applications, such as nanofluidic devices, ion sieving, biosensors, lithium-based batteries, and supercapacitors. Understanding the transport properties of cations in the interlayer spacings between Graphene oxide (GO) sheets is crucial for developing GOMs for these applications. In this study, we used an impedance-based quartz crystal microbalance (QCM) to detect the in situ structural adaptivity of interlayer spacings and cation behaviors in GOMs for responses to cation adsorption. The results showed that different cations (K+, Na+, Li+, or Mg2+) could cause various marked changes in GOM properties, including dissipation, mass, and viscoelastic characteristics, thereby revealing significant selective GOM transport properties, which indicated the excellent cation sensing and identification ability of GOMs. The presence of K+ resulted in a decrease in the mass and dissipation properties of GOMs, as obtained from the Δf–ΔR response analysis, which demonstrated the sieving effect of the cations of the KCl-controlled GOMs in our previous work. Notably, Li+ has superior transport and adsorption performances compared to other cations. We believe that these findings might provide a novel route in cation sensing, identification analysis, or the extraction of cations.

中文翻译：

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使用石英晶体微天平原位观察氧化石墨烯膜对各种阳离子的选择性传输特性

摘要 氧化石墨烯膜 (GOM) 已成为多种应用中的有前途的材料，例如纳米流体装置、离子筛分、生物传感器、锂基电池和超级电容器。了解氧化石墨烯 (GO) 片之间层间距中阳离子的传输特性对于开发用于这些应用的 GOM 至关重要。在这项研究中，我们使用基于阻抗的石英晶体微量天平 (QCM) 来检测层间距和 GOM 中阳离子行为对阳离子吸附响应的原位结构适应性。结果表明，不同的阳离子（K+、Na+、Li+ 或 Mg2+）可以引起 GOM 特性的各种显着变化，包括耗散、质量和粘弹性特性，从而显示出显着的选择性 GOM 传输特性，这表明 GOM 具有优异的阳离子传感和识别能力。K+ 的存在导致 GOM 的质量和耗散特性降低，如从 Δf-ΔR 响应分析中获得的，这证明了我们之前工作中 KCl 控制的 GOM 阳离子的筛分效应。值得注意的是，与其他阳离子相比，Li+ 具有优越的传输和吸附性能。我们相信这些发现可能为阳离子传感、识别分析或阳离子提取提供一条新途径。与其他阳离子相比，Li+ 具有优越的传输和吸附性能。我们相信这些发现可能为阳离子传感、识别分析或阳离子提取提供一条新途径。与其他阳离子相比，Li+ 具有优越的传输和吸附性能。我们相信这些发现可能为阳离子传感、识别分析或阳离子提取提供一条新途径。