Thermogravimetry, Fourier transform infrarred spectroscopy and scanning electron microscopy were performed on polyfuran films to assess thermal stability. The influence of temperature on the structure and morphology of doped polyfuran conducting films was discussed. Thermal degradation began around 95 degrees C, although aromaticity, structure and ordered nodular morphology in the growth face and the honeycomb appearance in the cross-section were partially conserved until about 210 degrees C.