A magnetic field-directed self-assembly solid contact has been proposed for developing an all-solid-state polymeric membrane Ca2+-selective electrode. The solid contact is prepared by physically adsorbing magnetic graphene powder on a magnetic gold electrode under the direction of the magnetic field. The proposed method for preparing solid contact avoids using the aqueous solutions and is simple, fast and general as compared to the multilayer drop-casting and electrodeposition methods. The all-solid-state Ca2+-selective electrode based on magnetic graphene as solid contact shows a stable potential response in the linear range of 1.0 × 10-6-1.0 × 10-3 M with a slope of 28.2 mV/decade, and the detection limit is about 4.0 × 10-7 M. Additionally, the magnetic graphene-based electrode shows a comparable potential stability performance to other graphene-based all-solid-state ion-selective electrodes, such as reduced undesirable water layer and insensitive to the interferences of O2, CO2 and light. This work provides a favorable way to prepare solid contact for use in the field of all-solid-state ion-selective electrodes.

中文翻译：

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一种用于构建全固态聚合物膜 Ca 2+ 选择性电极的磁场定向自组装固体接触

已经提出了一种磁场定向自组装固体接触，用于开发全固态聚合物膜 Ca2+ 选择性电极。通过在磁场方向下将磁性石墨烯粉末物理吸附在磁性金电极上制备固体触点。与多层滴铸和电沉积方法相比，所提出的制备固体接触的方法避免使用水溶液，并且简单、快速和通用。基于磁性石墨烯作为固体接触的全固态 Ca2+ 选择性电极在 1.0 × 10-6-1.0 × 10-3 M 的线性范围内表现出稳定的电位响应，斜率为 28.2 mV/decade，并且检测限约为 4.0 × 10-7 M。此外，基于磁性石墨烯的电极显示出与其他基于石墨烯的全固态离子选择性电极相当的潜在稳定性性能，例如减少了不需要的水层，并且对 O2、CO2 和光的干扰不敏感。这项工作为制备用于全固态离子选择性电极领域的固体接触提供了一种有利的方法。