Solvent effects on the characteristics of soluble polypyrrole

Chemical synthesis and charge transport mechanism in solution processed flexible polypyrrole films

“…This conductivity reduction was due to strong interaction between the PPy chains and solvent perturbing the molecular interaction between PPy and dopant. Such type of behavior is also reported for PPy-DBSA films [33].…”

“…It indicates that charge has to hop from three monomer units to four monomer units in PPy pellet with lowering temperature. Similarly in PPy film hopping distance increases from $ 8 monomer units to $11 monomer units of PPy with lowering in temperature from 300-80 K. The present results are also consistent with the Mott's requirement that R/r 41 and W4kT for applicability of 3d VRH model [32][33][34][35][36][37][38][39]. Thus, the temperature dependent activation energy and estimated values of Mott's hopping parameters indeed suggest that Mott's 3d-VRH model is quite appropriate for explaining the charge transport in both PPy pellet and film samples in the temperature range of 80-300 K.…”

“…This suggests that after solution processing, PPy becomes more sensitive towards temperature changes. This may be due to the solvent used for solution processing, perturbing the molecular interaction between conducting islands of doped PPy [33]. The hopping of charge carriers takes place between these conducting islands and temperature dependence of conductivity becomes stronger in PPy films as compared with pelletized sample.…”

Patterning ability of conducting polypyrrole thin films by positive photoresist

“…Position and shape of the bipolaron/polaron bands have been shown to be very dependent on environmental factors such as deposition surface [3,9,38], solvent [3,42,43] and the dopant ions [38,39,44,45]. UV-Vis-NIR spectra of thin films of PPy-a-NSA, PPy-(AQSANa,SSCA) and PPy-CSA deposited on modified glass surfaces for 40 min are shown in Fig.…”

Photoluminescence of a soluble polypyrrole based on N-vinylpyrrole

“…In recognition of these problems, efforts are being made to functionalize pyrrole by N-alkylation or C-alkylation of heterocyclic groups [3][4][5][6][7][8], by doping with anionic surfactants [9][10][11][12][13][14], or by preparing colloidal polymers [15][16][17][18] to increase solubility.…”