Nickel sulfate solution

Catalog Number	ACEP7786814
CAS Number	7786-81-4
Molecular Formula	NiSO4

Case Study

Nickel Sulfate Solution for Controlled Electroplating of Nickel Microelectrodes with Nanogaps

Valladares, Luis De Los Santos, et al. Nanotechnology 21.44 (2010): 445304.

In this study, Nickel sulfate solution (NiSO₄) was employed as the key electrolyte component for fabricating nickel microelectrodes with nanogaps through a controlled electroplating technique. The process allowed for precise control over the gap widths, which are crucial for applications requiring nanoscale features. The electrolyte consisted of 50 mM NiSO₄ and 500 mM boric acid (H₃BO₃), chosen for its ability to maintain pH stability, reduce hydrogen evolution, and enhance current efficiency during electroplating.
The electroplating process was carefully controlled by adjusting electrochemical parameters such as the applied potential and electrolyte composition. As the deposition progressed, the gap between the electrodes decreased exponentially, and the gap size could be stopped at a desired time to achieve various nanogap widths. This method enabled the creation of extremely small gaps beyond the resolution of e-beam lithography with high yield (~100%) and reproducibility.
Once the gap closed, it could be reopened using the ex situ Electrochemical Impedance-Based Junction (EIBJ) technique. Additionally, applying an external magnetic field corrected the I-V asymmetry, likely due to the alignment of magnetic moments in the nickel electrodes. This research demonstrates that Nickel sulfate solution is a highly effective electrolyte for fabricating controlled nanogaps in microelectrodes, offering a versatile and accessible approach for high-performance electroplating applications.

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