2.1. Materials
High purity chemicals, cyclohexane, n-butanol (spectroscopic
grade), cadmium sulfate, sodium sulfite and selenium powder
were obtained from Sigma-Aldrich and were used without any
further purification. Cetyl trimethyl ammonium bromide (CTAB),
was from Sigma-Aldrich, was recrystallized twice from ethanol
[47]. Ammoniated cadmium sulfate, (Cd[NH3]4SO4) solution was
used as cadmium precursor. Sodium selenosulfate, Na2SeSO3
solution was used as the selenium precursor, which was prepared
by the reported procedure [48].