Studies on Production of Fine Silver Powder by Reduction with Organic Reductant.

Reduction of silver nitrate solution with some reducing agents was studied to obtain fine silver powder suitable for conductive paste.In ammoniacal solution, sub-micron spherical silver particles were obtained by use of hydroquinone, pyrogallol, and 3, 4-dihydroxytoluene; uene as a reducing agent. Reduction rates with the reductants were very fast and completed within a few seconds with almost 100% yields.From the result of X-ray diffraction and the observations of internal structure by transmission electron microscope, it was considered that the spherical particles were resulted from the agglomeration of crystallittes about 20nm in size.