Preparation of Gold Nanoparticles using Photographic Materials (9) : Effect of Silver-halide Base

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  • 銀塩写真感光材料を用いた金微粒子の調製（9）基板ハロゲン化銀粒子の影響
  • ギンエン シャシン カンコウ ザイリョウ オ モチイタ キン ビリュウシ ノ チョウセイ(9)キバン ハロゲンカギン リュウシ ノ エイキョウ

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Abstract

<p>Effects of silver-halide base to the preparation of gold nanoparticles by gold-deposition development were analyzed by postfixation development on lonely latent image specks after the removal of silver halide or carbon-replica observation of silver-halide grains with depositing gold particles. Results of the postfixation development suggested that the acceleration of development rate by addition of ascorbic acid (AA) in the developer was due to the direct reduction of Au (I) ions by AA. Gold particles formed on silver halide surface at high concentration of AA had many fine protrusions, and participation of silver filaments formed by reduction of silver halide with AA was suggested. This acceleration by AA was more remarkable on octahedral grains than on cubic grains, and was due to the difference of latent image formation process. Effects of the crystal faces on silver-halide grain to the gold-deposition development process itself were not so significant.</p>

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