LAUSR

Abstract The spectral study of binding of oxazine (NB) and thiazine (AA, AB, AC, MB and TB O) dyes with cationic cetyltrimethylammonium bromide (CTAB) and non ionic tween 80, surfactant has been done in alkaline medium at lab temperature. All dyes show blue shifting in their λmax value in presence of both CTAB and tween 80 but high absorbance with CTAB. Since, the dye which shows less blue shifting in its λmax and more absorbance value with CTAB/tween 80 is considered more stable. Therefore, the dyes MB, TB O and AA (less blue shifting) are more stable than AB, AC and NB (more blue shifting) in presence of CTAB/tween 80. It means the dyes may be more solubilized and stabilized with CTAB than tween 80 and the stability of dye-CTAB/tween 80 is directly proportional to the electrical output in photogalvanic cells. The order of stability of these dyes on the basis of blue shifting with CTAB/tween 80 is: MB > AA > TB O > AB > AC > NB. Hence, this type of study may be helpful for choosing a stable dye-surfactant combination and to understand the reason for stability and higher electrical output of the photogalvanic cell for solar energy conversion and storage.