Abstract
Interaction of polyaniline (PANI) with a protonating dopant, dodecylbenzenesulfonic acid (DBSA), and an organic electron acceptor, pentadecyltetracyanoquinodimethane (C 15TCNQ), is studied in DMSO solutions, using optical absorption spectroscopy. Each of the two agents alone induces an absorption band at 417 nm, attributable to cation-radicals of PANI. Free carrier absorbance in the near-infrared is absent in the case of C 15TCNQ. Moreover, the charge-transfer interaction between PANI and C 15TCNQ suppresses a transition to the conductive state. When PANI/C 15TCNQ mixtures are aged, a new band near 500 nm appears that can be attributed to an adduct of PANI and C 15TCNQ.
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