TiO2 colloid has been prepared by hydrolysis of titanium tetrabutoxide
while composite nano-particles of Ag/TiO2 were synthesized by photoreaction. The effects of the concentrations of reaction
pH value and the addition of ethanol on the radiochemical yield were studied. Under the optimum conditions
the composite nano-particles of (110Agm) Ag/TiO2 were synthesized with radiochemical yield of 93.6% and specific volume radioactivity of 0.6MBq/mL. The stability of (110Agm)Ag/TiO2 at pH =6.7 showed that the radiochemical yield remained to be 93.0% after 48h. The size of TiO2 and Ag/TiO2 determined by AFM microscopy were 1~2nm and 15~40nm