Abstract
Deposition of metallic powders from aqueous solutions without an external current source is presented. Metallic powders can successfully be produced via galvanic displacement reaction or by electroless deposition from homogenous aqueous solutions or slurries. Formation of powders such as Cu, Ni, Co, Ag, Pd, and Au from homogenous solutions using an appropriate reducing agent or Ag via galvanic displacement reaction was demonstrated. The hydrolysis of metallic ions is a crucial step in the deposition metallic powders via electroless deposition from homogenous solutions. To confirm that the hydrolysis phenomenon is essential in the electroless deposition of metallic powders, oxides, such as Ag2O, Cu2O, and CuO, were suspended in water. It was clearly demonstrated that these oxides can be successfully reduced with an appropriate reducing agent, leading to the precipitation of metallic powders.
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