Quantum confinement effects in highly conducting, ultrathin polyaniline films pursued through spectroscopic investigations

CSA-doped PANI semiconductor nanofilms: synthesis and characterization

“…The absorption peak observed around 300 nm in all the spectra represents the p ? p* transition as reported by Varma [7] in his ultrathin PANI-CSA films of nanometer thickness. Absorption coefficient (a) and optical band gap (E g ) of PANI-CSA films with different PANI:CSA weight ratios (1:0.5, 1:1 and 1:2) were given in Table 3.…”

“…The disappearance of peak around 410 nm with a sharp high intense peak around 494 nm is due to the fully doped state which confirms the conducting PANI [30] which was not found in our PL analysis. Varma [7] too has already reported similar emission for PANI-CSA films of nano-thickness. The broad emission peak around 410 nm for all films is also due to the presence of heavier dopant ions (SO 3 -) in CSA-doped PANI [25].…”

“…The peaks at 804, 1302, 1474, 1557 and 3439 cm -1 corresponds to PANI-HCl and the peaks at 830, 1145, 1307, 1492 and 1589 cm -1 corresponds to PANI EB [21,22]. Similarly, the peaks at 749, 1250, 2922 and 3036 cm -1 corresponds to PANI-CSA [7,[21][22][23]. Table 2 shows the list of observed peaks with their corresponding functional groups.…”

“…Among all the conducting polymers, polyaniline (PANI) stand as the most potential conducting polymer due to its high electrical conductivity, charge transport mechanism, environmental stability and low synthesis cost. It finds application in bio sensors such as cholesterol sensor [1], glucose sensor [2], and gas sensors [3,4], electromagnetic shielding [5], light emitting devices [6,7], photovoltaic applications [8][9][10][11], light weight batteries [12], organic displays [13] etc. PANI demands several essential conditions for its high yield.…”

Measurement on the structural, morphological, electrical and optical properties of PANI-CSA nanofilms

“…Among all the conducting polymers, due to high electrical conductivity, charge transport mechanism, environmental stability and low synthesis cost, polyaniline (PANI) stands as the most potential conducting polymer. It finds application in bio sensors namely cholesterol sensor [1], glucose sensor [2], gas sensors [3,4] and in other fields such as electromagnetic shielding [5], light emitting devices [6,7], photovoltaic applications [8][9][10][11], light weight batteries [12], organic displays [13] etc. PANI can be tuned to either conducting or insulating nature by doping or dedoping procedure respectively, through reversible chemical, electrochemical process.…”