Abstract
The 488.0 and 1064 nm-excited Raman spectra have been measured for dipping films of 2-octadecyl-7,7,8,8-tetracyanoquinodimethane (octadecyl-TCNQ) and docosylpyridinum-TCNQ salt and mixed-stack charge transfer films of octadecyl-TCNQ doped with 3,3′,5,5′-tetramethylbenzidine (TMB) deposited on silver mirror. The 488 nm-excited Raman and 1064-nm excited FT-Raman spectra of dipping films of octadecyl-TCNQ and docosylpyridinum-TCNQ salt and CT film of octadecyl-TCNQ doped with TMB on the silver mirror gave very intense Raman bands with a high signal-to-noise ratio owing to the SERS effect. From the frequency of a C≡N stretching band of the CT film of octadecyl-TCNQ doped with TMB on silver mirror, the degree of CT can be calculated to be 0.42, suggesting that the CT film is in a quasi-neutral state. The C≡N stretching band of the dipping film of docosylpyridinium-TCNQ salt indicates the strong interaction of TCNQ group with silver mirror surface.
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