Raman spectra of polypyrrole and its 2,5-13C-substituted and C-deuterated analogues in doped and undoped states

Conducting polymer gas sensors part II: response of polypyrrole to methanol vapour

Electrical conductivity and thermoelectric power of polypyrrole with different doping levels

The growth of polypyrrole films on electrodes

Chemical synthesis of highly conducting polypyrrole by the use of copper(II) perchlorate as an oxidant

Characterisation of the transport properties of conducting polypyrrole films

A series of conducting polypyrrole films was prepared from aqueous TsONa solution of different concentrations, and investigated by means of elemental analyses and scanning electron microscopy. The results show that the different concentrations of the supporting electrolyte TsONa do not only cause different amounts of counter ions in the film, but also cause a different structure and morphology of the film.

Structure and amounts of counter ions in polypyrrole films prepared from aqueous solutions of sodium tosylate

Structural characterisation of conducting polymers by small angle neutron scattering

We present a new type of photoconductive GaAs switch, which can be integrated directly onto an already existing high-T, circuit. Our test circuit consists of two coupled coplanar transmission lines made of gold on top of a YBa,Cu,O, layer grown on a MgO substrate. When the photoconductive switch is irradiated with femtosecond laser pulses, subpicosecond (0.4 ps) electric pulses are created. These pulses are capable of propagating more that 1 mm along the transmission line. The pulses were detected with a photoconductive sampling technique, and results are presented at both room temperature and at 81 K. The photoconductive switch is useful both'as an optical trigger generating pulses and in the sampling system detecting the pulses. This switch can be used to characterize high-T, circuits e.g. SFQ logic in the subpicosecond time domain.

Yueqiang Shen

Papers

Characterisation of the transport properties of conducting polypyrrole films

Structure and amounts of counter ions in polypyrrole films prepared from aqueous solutions of sodium tosylate

Structural characterisation of conducting polymers by small angle neutron scattering

nd propagation of subpicosecond pulses in a photoconducti~e GaAs rated onto a goldNBa,Cu,O, coplanar transmission line structure