Synthesis of Ag_2S nano-sized clusters and their chemical sensitizations in AgCl cubic and {100} tabular microcrystal imaging systems

1 Introduction Since the 1990s, silver chloride {100} tabular grain emulsion has attracted much attention from research-ers working in different enterprises all over the world, such as Eastman Kodak1―5], Agfa-Gavaert6,7] and the Lucky Group Company in …

Synthesis of Ag2S nano-sized clusters and their chemical sensitizations in AgCl cubic and {100} tabular microcrystal imaging systems

In recent years much attention has been devoted to AgCl emulsion owing to its se-rial advantages and inimitable potential. But in the research of this emulsion a thorny problem remains unsolved till now, which is the improvement in sensitivity is always accompanied with high fog density. In this work 5 nm Ag2S particles were prepared and used as novel sensitizers in AgCl cubic and {100} tabular microcrystal emulsions. The novel sensitizer shows an effective sensitizing ability for silver chloride emulsion, and it is superior to the traditional Na2S2O3 sensi-tizer because by using it comparatively high sensitivity can be obtained with lower fog density. So the above sensitizing problem is going to be effectively solved. To discover the evolution mechanism of the sensitizer clusters and explain their excellent sensitizing properties, diffuse reflectance spectroscopy (DRS) was used as a probe on the AgCl microcrystal surface.