In situ growth of quasi-superhydrophobic porous NiCo₂S₄ nanosheet arrays with a one-step electrodeposition method was provided. A calcium ion-selective electrodes (Ca²⁺-ISE) was subsequently constructed by using the prepared NiCo₂S₄ as a solid contact layer. The proposed Ca²⁺-ISE exhibits a good Nernstian slope of 30.7 ± 0.3 mV/dec and a detection limit of 1.6 × 10⁻⁷ M. Due to the large redox capacitance of 1.8 mF, the Ca²⁺-ISE based on NiCo₂S₄ nanosheet arrays shows a high potential stability of 1.9 ± 0.5 μV/h over 90 h. Excellent reproducibilities for the NiCo₂S₄-based Ca²⁺-ISEs can be obtained with the single batch and batch-to-batch E° standard deviations of 0.3 (n = 6) and 0.7 mV (n = 5), respectively. The NiCo₂S₄ nanosheet arrays have a large contact angle of 148 ± 1.4^°, which effectively suppresses the formation of a water layer at the sensing membrane/NiCo₂S₄ interface.

提供了采用一步电沉积法原位生长准超疏水多孔NiCo ₂ S _{4纳米片阵列。}随后通过使用制备的NiCo ₂ S ₄作为固体接触层来构建钙离子选择性电极(Ca ^{2+ -ISE)。}所提出的 Ca ²⁺ -ISE 表现出 30.7 ± 0.3 mV/dec 的良好能斯特斜率和 1.6 × 10 ^-7  M 的检测限。由于 1.8 mF 的大氧化还原电容，基于 NiCo的 Ca ^{2+ -ISE} ₂ S ₄纳米片阵列在 90 小时内表现出 1.9 ± 0.5 μV/h 的高电位稳定性。NiCo _{2具有出色的重现性}基于S ₄的 Ca ²⁺ -ISE 可以分别以0.3 (n = 6) 和 0.7 mV (n = 5)的单批次和批次间E°标准偏差获得。NiCo ₂ S ₄纳米片阵列具有148±1.4 ^{°的大接触角，有效抑制了传感膜/NiCo} ₂ S ₄界面处水层的形成。