Abstract:Ruthenium dioxide (RuO2) exhibits high electrical resistance stability and a low temperature coefficient of resistance, making it widely used as the conductive phase in the preparation of thick-film resistor pastes. By employing anhydrous ruthenium chloride as the raw material and water as the reaction medium, monodisperse RuO2 powder with high sphericity through a liquid phase chemical reducing hydrothermal precipitation method were obtained. The morphology, particle size, and agglomeration of RuO2 powder were analyzed by using scanning electron microscopy (SEM), while the crystal phase of the powder was detected using an X-ray diffractometer (XRD). Additionally, the resistive properties of both RuO2 and RuO2/CuO were tested using an electrochemical workstation. The results showed that the monodispersed, high-sphericity, and uniformly sized nano RuO2 exhibited the lowest impedance, and its conductivity was significantly superior to RuO2 particles with obvious agglomeration. Moreover, compared to CuO, RuO2/CuO also displayed superior conductivity.