CJCU

Chem. J. Chinese Universities ›› 2000, Vol. 21 ›› Issue (5): 766.

• Articles • Previous Articles     Next Articles

Studies on Electroless Deposition Catalyzed by Gold in Photographic Gelatin Layer with Positron Annihilation

ZHANG Yi-Heng1, GONG Zhu-Fang2, ZHANG Guang-Xiang1, JIANG Zhi-Quan XU Xu-Guo1, YAN Tian-Tang1, YU Shu-Qin1, ZHUANG Si-Yong3, PENG Bi-Xian4   

  1. 1. Department of Applied Chemistrys, University of Science and Technology of China, Hefei 230026, China;
    2. Deportment of Modern Physics, University of Science and Technology of China, Hefei 230026, China;
    3. Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;
    4. Institute of Fine Chemical Industry, East China University of Science and Technology, Shanghai 200237, China;
    5. Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing 100101, China
  • Received:1999-05-11 Online:2000-05-24 Published:2000-05-24

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Abstract: The mechanism of action of free volume holes in photographic gelatin on the electroless deposition process has been studied by Positron Annihilation Technology (PAT) in this paper. The results show that after complete activation, the average volume of the free volume holes in photographic decreas- es by about 0.011 nm3, which is equivalent to the volume of a gold atom. In the view of statistical average concept, every free volume hole is filled with a gold atom to catalyze the electroless copper deposition. Thus the imaging feature formed in the physical development is not filament, but spherical stacks. After electroless copper deposition is accomplished, the average volume of the free volume holes in photographic gelatin decreases by about 0.020 nm3, which is equivalent to the volume of three copper atom. Therefore the deposition of copper in isotropic and spherical form was not hindered by free volume holes in photographic gelatin.

Key words: Electroless deposition, Positron annihilation technology, Photographic gelatin

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