Soluble conductive polypyrrole synthesized byin situ doping with ?-naphthalene sulphonic acid

One Step to Prepare Ag/PPy Composites with Different Soft Templates

“…In general, it can be seen that the characteristic PPy peaks are located at 1544 and 1446 cm -1 due to the pyrrole ring stretching and the conjugated C-N stretching mode, respectively. The peaks at 1294 and 1031 cm -1 are related to the in-plane vibrations of C-H, 1182 cm -1 is assigned to the C-N stretching mode [10], In addition, the peaks at 912, 673cm -1 corresponds to the stretching vibration of the SO 3 ¯ group, which indicates the β-NSA or SDS entering the resulting composites as dopant [11]. Furthermore, a very strong absorption band assignable to N-O stretch of NO 3 counterions observed at 1382 cm -1 , suggesting that the Ag/PPy composites are doped by NO 3 ¯ [12].…”

Decorating Polypyrrole Nanotubes with Au Nanoparticles by an In Situ Reduction Process

“…In Figure 3a, the absorption peak at 465 nm for the PPy nanotubes is assigned as the π – π * transition of PPy 24. In comparison with the PPy nanotubes, no new peak appears, but a blue shift from 465 to 420 nm for the PPy/Au nanotubes is observed when the reactions are carried out at 0 and 25 °C, which indicates that: 1) the amount of Au nanoparticles on the surface of the PPy nanotubes is so small that plasmon resonance absorption is very weak and is overlayed by the absorption of PPy, and 2) the conjugation degree of PPy decreases as a result of being partially over‐oxidized by HAuCl 4 30. Furthermore, with a temperature increase, the blue‐shift becomes more apparent.…”

Preparation and characterization of polypyrrole/selenium composites

“…The peak at 239 nm is due to π‐π * transition in PPy, while the peak at 486 nm is due to the transition from valance band to antibonding polaron state [11, 18]. The peaks observed at 588 and 657 nm are related with n →π * transition and polaron, respectively [19, 20].…”