To provide new silver ink in which silver nanoparticles are dispersed at relatively high concentration in a liquid medium of alicyclic and aromatic hydrocarbons such as diethylbenzene and decalin.
The silver ink contains silver particles dispersed in a liquid medium of aromatic hydrocarbons at a silver concentration of 20 to 60 mass%, the silver particles adsorbing octyl gallate, dodecyl gallate or castor oil to the surfaces and having a crystal grain diameter Dx by X-ray analysis of 1 to 40 nm, preferably 1 to 15 nm; and when the liquid is left to stand after stirring, the liquid maintains the dispersion state at least for 168 hours. In particular, combinations of diethylbenzene/octyl gallate, diethylbenzene/dodecyl gallate, diethylbenzene/castor oil, decalin/octyl gallate and decalin/dodecyl gallate are preferable.
SASAKI SHINYA
NAKANOYA TARO
Kenji Wada
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