  We show that the recently synthesized BF3-doped polyaniline (PANI) exhibits
remarkable stability against thermal ageing. Unlike the protonated PANI, which
shows rapid degradation of the conductivity on heating in air, BF3-doped PANI
shows more than an order of magnitude improvement in conductivity. We employ
x-ray photoelectron spectroscopy (XPS), fourier transform infra-red (FTIR)
spectroscopy, and x-ray diffraction (XRD) to understand this unexpected
phenomenon.
