Hybrid materials of polyaniline and acidic hexaniobate nanoscrolls: high polaron formation and improved thermal properties

Abstract

New hybrid materials of polyaniline and hexaniobate nanoscrolls were prepared by the mixture of the dispersions. These materials show high doping of polyaniline and high thermal stability.

Ternary nanocomposites of reduced graphene oxide, polyaniline and hexaniobate: hierarchical architecture and high polaron formation

“…This indicates that the formation of polaron segments in the PANI chains is further induced by the interaction with rGO and hexNb components. This behaviour of high polaron formation induced by hexNb nanoparticles has been reported by us before [ 7 ]. The results of XPS spectra at N 1s core level are supported by resonance Raman spectroscopy, as shown below.…”

“…Fig. 3 shows that the particles on the surface of rGO/PANI/hexNb exhibit a scroll-like shape (high aspect ratio), which is very similar to well-described hexNb nanoscrolls [ 7 , 37 – 38 ]. These results show the interesting hierarchical architecture of the ternary nanocomposite of rGO flakes coated with PANI and decorated by hexNb nanoscrolls.…”

“…The inorganic phase induces a secondary doping of the conductor polymer. In another work [ 7 ], Raman and EPR spectra also revealed that a PANI/hexNb nanocomposite prepared by the self-assembly approach exhibits a higher conversion of bipolaronic to polaronic segments compared to the neat polymer and a superior thermal stability (the doped form of PANI is observed even after heating at 150 °C for 90 min).…”

“…1 ). Moreover, strong interactions of PANI chains with acidic surfaces of H 2 K 2 Nb 6 O 17 may dramatically affect the doping state of the polymeric chains [ 6 – 7 ], which is an interesting feature regarding applications of PANI-based materials.…”

Síntese e caracterização de hidro-esponjas de polímeros condutores

“…A banda localizada na região entre 1510-1480 cm -1 é muito importante na caracterização da estrutura polimérica da PANI, uma vez que esta região está associada aos dois tipos de portadores de carga da PANI, polarons e bipolarons, podendo indicar a população relativa entre os mesmos [200,201,203]. Uma análise detalhada desta importante região do espectro tem sido reportada para materiais híbridos de PANI/hexaniobato e tem mostrado que as populações relativas polarons/bipolarons são sensíveis à interação entre cadeia polimérica e a alta acidez da superfície do hexaniobato [204][205]. Estes resultados estão associados com as mudanças conformacionais (dopagem secundária) e a alta dopagem das cadeias poliméricas da PANI.…”