Abstract
The competitive adsorption of the Na salt of phytic acid (PA) and 4-methyl-4H-1,2,4-triazole-3-thiol (4-MTTL) was investigated by using the surface-enhanced Raman scattering (SERS) technique and electrochemical measurements. On the basis of the recorded SERS spectra, it was found that PA molecules could competitively occupy the silver surface modified with 4-MTTL monolayers and that the competitive adsorption of 4-MTTL at the silver surface with the PA monolayers also happened, but the effect of coadsorption of PA on the structure of 4-MTTL monolayers was smaller than that of 4-MTTL on the PA monolayers. In addition, according to the electrochemical measurements, the only 4-MTTL monolayers or the only PA monolayers at the silver surface exhibited a reasonable stability. The coadsorption of 4-MTTL and PA formed a mixed film at the silver surface immersed in the solution with the coexistence of 4-MTTL and PA, and the film was unstable when a potential was applied.
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