Abstract
Recently, new additions to nonconjugated conductive polymers have been made that include: poly(β-pinene), poly(ethylenepyrrolediyl) derivative and polynorbornene. These polymers have different double-bond number fractions per repeat compared to previously reported nonconjugated conductive polymers. Upon doping with electron acceptor (e.g. iodine) the conductivities increase more than ten orders of magnitude to levels consistent with their double-bond number fractions. Radical cations that are formed upon doping have dimensions less than a nanometer leading to unexpectedly large nonlinear optical effects. The measured Kerr coefficient of doped polyisoprene is ∼1.6 × 10-10 m/V2 at 633 nm. For doped poly(β-pinene) the Kerr coefficient is ∼1.2 × 10-10 m/V2 and for poly(ethylenepyrrolediyl) derivative it is ∼1.2 × 10-9m/V2. Exceptionally large two-photon absorption coefficient (∼2.6 cm/MW at 810 nm) has been measured for doped poly(β-pinene). The mechanism of the nonlinear optical effect has been explained using a model of subnanometer size metallic quantum dots. These novel materials with wide transparency are expected to have significant applications in photonics.
Published Version
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