Improved mechanical and electronic properties of Co-assembled folic acid gel with aniline and polyaniline

Priyadarshi Chakraborty, Partha Bairi, Bappaditya Roy, Arun K. Nandi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Co-assembled folic acid (F) gel with aniline (ANI) (ANI:F = 1:2, w/w) is produced at 2% (w/v) concentration in water/DMSO (1:1, v/v) mixture. The gel is rigid and on polymerization of the gel pieces in aqueous ammonium persulfate solution co-assembled folic acid - polyaniline (F-PANI) gel is formed. Both the co-assembled F-ANI and F-PANI gels have fibrillar network morphology, the fiber diameter and its degree of branching increase significantly from those of F gel. WAXS pattern indicates co-assembled structure with the F fiber at the core and ANI/PANI at its outer surface and the co-assembly is occurring in both F-ANI and F-PANI systems through noncovalent interaction of H-bonding and π stacking processes between the components. FTIR and UV-vis spectra characterize the doped PANI formation and the MALDI mass spectrometry indicates the degree of polymerization of polyaniline in the range 24-653. The rheological experiments support the signature of gel formation in the co-assembled state and the storage (G′) and loss (G″) modulii increase in the order F gel< F-ANI gel < F-PANI gel, showing the highest increase in G′ ≈ 1100% for the F-PANI gel. The stress at break, elasticity, and stiffness also increase in the same order. The dc-conductivity of F-ANI and F-PANI xerogels is 2 and 7 orders higher than that of F xerogel. Besides, the current (I)-voltage (V) curves indicate that the F-xerogel is insulator, but F-ANI xerogel is semiconductor showing both electronic memory and rectification; on the other hand, the F-PANI xerogel exhibits a negative differential resistance (NDR) property with a NDR ratio of 3.0.

Original languageEnglish
Pages (from-to)3615-3622
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number5
StatePublished - 12 Mar 2014
Externally publishedYes


  • folic acid
  • negative differential resistance
  • polyaniline
  • rectification
  • rheology
  • supramolecular gel


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