Zinc oxide (ZnO) is an n-type II-VI semiconductor material that has gained prominence in recent decades due to the possibility of applications in the most diverse scientific areas, such as photonics, optoelectronics, magnetism, and biological systems. In this context, the scientific community seeks alternative synthetic methodologies to those already established in the literature, emphasizing the use of organic solvents, which are increasingly efficient, low-cost, and easy to reproduce. Thus, the present work proposed a method of colloidal aqueous synthesis, using different precursors of zinc and cobalt salts in a molar fraction according to the expression, Zn_1-xCo_xO (x = 0.05, 0.075, 0.10), mercaptosuccinic acid (MSA) as a stabilizing agent, in a stoichiometric ratio of 1:4 of Zn:MSA, and NaOH as a precipitating agent at pH = 11. The colloidal suspension obtained after 90 min of synthesis was frozen, remaining stable after the thawing of the suspension. A mixture of isopropyl alcohol and acetone was used to force the precipitation process. The precipitates obtained were washed with water and ethyl alcohol for subsequent heat treatment for one hour in an oven at 120 ºC and annealed at 300 ºC for two hours. The results confirmed the formation of pure and cobalt-doped ZnO nanoparticles from X-ray diffractometry characterization. To evaluate their properties, studies of compositional analysis and size distribution of ZnO nanoparticles using characterization techniques such as inductively coupled plasma spectroscopy (ICP) and transmission electron microscopy (TEM) are being carried out to obtain even more promising results in this field.