Analysis of Micro Structure and the Resistivity of Cu / Ni Thin Coat as a Low Temperature Sensor Using Electroplating Method Assisted with Magnetic Field Outside of the Ion Flow

摘要

Preservation of materials using liquid nitrogen media has been widely used. One of them is used in the medical field, namely cryonic technology. Cryonics is a method of preservation at cold temperatures using a cryoprotectant in liquid nitrogen. To maintain the quality of the material, a sensor that can detect the temperature of liquid nitrogen is needed. Low temperature sensors with Cu and Ni based Resistance Temperature Detector with layers (RTD) have been made, but these sensors have a layer of Ni deposits that are not yet homogeneous. So quality improvement is needed by adding an external magnetic field. Based on this, the aim of this research is to synthesize a thin layer of Cu / Ni using electroplating method assisted by external magnets parallel to the ion currents. The synthesis was carried out by placing Ni on the anode and Cu on the cathode at a distance of 4 cm, a voltage of 3 V, and a deposition time of 60 s. The electrolyte solution used is a mixture of NiSO4, NiCl2, H3BO3 and H_2O at 60 C. The magnetic field used is 0 G to 250 G at 50 G intervals by placing it parallel to the ion current. The Ni layer that has been formed is then characterized by measuring the thickness of the Ni layer, the microstructure with X-Ray Diffraction (XRD), chip resistivity, and sensor performance.