Rani, Joseph(John Wiley & Sons, Inc., June 21, 2001)
[+]
[-]
Abstract:
ABSTRACT: Polyaniline was synthesized by using ammonium persulfate initiator in the
presence of 1M HC1. It was dried under different drying conditions like room temperature
drying (for 48 h), oven drying (at 50-60°C for 8 h under a vacuum), and vacuum
drying (at room temperature for 16 h). The conductivities of these samples were
measured at microwave frequencies. These samples were also pelletized and the
measurements were repeated. The cavity perturbation technique was used for the
study.
Anantharaman, M R; Venkitachalam, S; Saravanan, S; Rajeev, Ashokan R; Joseph, Mathai C; Sajeev, U S(Springer India, January 10, 2006)
[+]
[-]
Abstract:
Polyaniline is a widely studied conducting polymer and is a useful material in its bulk and thin
film form for many applications, because of its excellent optical and electrical properties. Pristine and iodine
doped polyaniline thin films were prepared by a.c. and rf plasma polymerization techniques separately for the
comparison of their optical and electrical properties. Doping of iodine was effected in situ. The structural
properties of these films were evaluated by FTIR spectroscopy and the optical band gap was estimated from
UV-vis-NIR measurements. Comparative studies on the structural, optical and electrical properties of a.c. and
rf polymerization are presented here. It has been found that the optical band gap of the polyaniline thin films
prepared by rf and a.c. plasma polymerization techniques differ considerably and the band gap is further reduced
by in situ doping of iodine. The electrical conductivity measurements on these films show a higher value
of electrical conductivity in the case of rf plasma polymerized thin films when compared to the a.c. plasma polymerized
films. Also, it is found that the iodine doping enhanced conductivity of the polymer thin films considerably.
The results are compared and correlated and have been explained with respect to the different
structures adopted under these two preparation techniques
Description:
Bull. Mater. Sci., Vol. 29, No. 2, April 2006, pp. 159–163
Girijavallabhan, C P; Radhakrishnan, P; Nampoori, V P N; Sajan, D George; Saravanan, S; Venkatachalam, S(Physical Review, American Physical Society, June 8, 2004)
[+]
[-]
Abstract:
Thermal diffusivity of the composites of camphor sulphonic acid (CSA) doped polyaniline (PANI) and its
composites with cobalt phthalocyanine (CoPc) has been measured using open cell photoacoustic technique.
Analysis of the data shows that the effective thermal diffusivity value can be tuned by varying the relative
volume fraction of the constituents. It is seen that polaron assisted heat transfer mechanism is dominant in CSA
doped PANI and these composites exhibit a thermal diffusivity value which is intermediate to that of CSA
doped PANI and CoPc. The results obtained are correlated with the electrical conductivity and hardness
measurements carried out on the samples.
Anantharaman, M R; V P N Nampoori; Radhakrishnan, P; Girijavallabhan, C P; Sajan, D George; Saravanan, S; Venkatachalam, S(Physical Review, American Physical Society, June 8, 2004)
[+]
[-]
Abstract:
Thermal diffusivity of the composites of camphor sulphonic acid (CSA) doped polyaniline (PANI) and its
composites with cobalt phthalocyanine (CoPc) has been measured using open cell photoacoustic technique.
Analysis of the data shows that the effective thermal diffusivity value can be tuned by varying the relative
volume fraction of the constituents. It is seen that polaron assisted heat transfer mechanism is dominant in CSA
doped PANI and these composites exhibit a thermal diffusivity value which is intermediate to that of CSA
doped PANI and CoPc. The results obtained are correlated with the electrical conductivity and hardness
measurements carried out on the samples