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Description
In this work, nickel compound quantum dots (Ni-QDs) are synthesized by electrochemical process. The electrochemical process known as a facile method is used to prepare Ni-QDs colloid solution. Ni-QDs are synthesized using nickel-metal rods (2 mm in dimension and 5 cm in length) dipped into an electrolyte solution of potassium chloride and citric acid at 0.4M and 0.1M concentrations, respectively, then applied voltages at 1,3 and 6 V for the synthesis process. As the result, Ni-QDs are characterized for size and stability by transmission electron microscopy (TEM), dynamic light scattering (DLS) and Zeta potential technique. The absorption spectra of Ni-QDs are indicated via ultraviolet-visible spectroscopy (UV-vis) at 390, 655, and 731 nm of wavelength which can be assigned to absorption peaks of Ni (OH)2 and NiCl2, respectively. The crystalline structure and photoluminescence properties of Ni-QDs are examined with X-ray diffractometry (XRD), and photoluminescence spectroscopy. It is found that the Ni-QDs growth rate can be controlled by the various voltages applied in the synthesis process. The smallest size and high yield of Ni-QDs are achieved with the low voltage applied (1V), while the higher voltage process produced a strong chemical reaction resulting in the lower yield of Ni-QDs due to the large particles of the obtained products. Thus, the influence of voltage in the synthesis of Ni-QDs is important to optimize the quality of Ni-QDs.
