Wet Chemical Synthesis of Entangled Nano-fibrous Conducting Polyaniline (PANI) Mesh: Effect of Heating and Stirring

Abstract

An effect of heating and stirring in a facile wet chemical route to synthesize entangled nanofibrous mesh of doped polyaniline (PANI) was reported. The structural, morphological, and optical properties of PANI nano-fibers were found to be dependent on synthesis temperature and stirring. The XRD analysis confirms nano PANI formation with 2θ peaks around 15°, 21°, and 25° for (011), (020), and (200) crystal planes, respectively. The average crystallite size varies between 25 nm to 60 nm due to change in synthesis conditions. The SEM analysis reveals the clustered granule formation for PANI sample synthesized at 28 and 60 ° under continuous stirring, whereas, unstirred synthesis at 60 ° shows entangled nano-fibrous mesh morphology. The TGA study shows better thermal stability for PANI mesh over granular PANI. The FTIR spectra validates the emeraldine salt PANI formation with peaks corresponding to C-H, C-N, N=Q=N, N=B=N, and N-H vibration bands. The UV-Vis analysis shows the major absorbance peaks around λ: 340 nm (π-π* transition of benzenoid ring), and λ: 800 nm (π-π*, polaron-π*, π-polaron transitions). The dense entangled nano-fibrous coating of PANI synthesized at 60 ° without stirring shows highest electrical conductivity of 3.79 S·cm^-1.

Keywords

polyaniline / nano-fibrous mesh / optical property / electrical conductivity

References

[1] Wise DL, Wnek GE, et al. Photonic Polymer Systems FunDamentals, Methods, and Applications, 1998, 1: 968.

[2] TA Skotheim. Handbook of Conducting Polymers, 1997 2nd ed. Boca Raton: CRC Press. 1-1 059.

[3] Li D, Huang J, Kaner R. Polyaniline Nanofibers: A Unique Polymer Nanostructure for Versatile Applications. Acc. Chem. Res, 2009, 42: 135-145.

[4] Wei H, Yan X, et al. Electropolymerized Polyaniline Stabilized Tungsten Oxide Nanocomposite Films: Electrochromic Behavior and Electrochemical Energy Storage. J. Phys. Chem. C, 2012, 116: 25 052-25 064.

[5] Yu Y, Che B, et al. Carbon Nanotube/Polyaniline Core-shell Nanowires Prepared by in Situ Inverse Microemulsion. Synth. Met., 2005, 150: 271-277.

[6] Na L, Jianxiong X, et al. Synthesis of Polyaniline-Coated Ordered Mesoporous Carbon Composite Electrode Material for Supercapacitor and Its Enhanced Electrochemical Performance. J. Nanosci. Nanotechnol., 2015, 15: 4 961-4 968.

[7] Su Z, Pan D, et al. Synthesis, Properties and Application of Polyaniline/ Titanium Carbide Nanoparticles Modified Electrode. Int. J. Electrochem. Sci., 2015, 10: 2 413-2 420.

[8] Wang N, Li J, et al. Synthesis of Polyaniline/TiO₂ Composite with Excellent Adsorption Performance on Acid Red G. RSC Adv., 2015, 5: 21 132-21 141.

[9] Joseph N, Varghese J, et al. Self Assembled Polyaniline Nanofibers with Enhanced Electromagnetic Shielding Properties. RSC Adv., 2015, 5: 20 459-20 466.

[10] Bhagwat AD, Sawant SS, Mahajan CM. Facile Rapid Synthesis of Polyaniline (PANI) Nanofibers. Journal of Nano- and Electronic Physics, 2016, 8(1): 1 037

[11] Ć-Marjanović G. Recent Advances in Polyaniline Research: Polymerization Mechanisms, Structural Aspects, Properties and Applications. Synth. Met., 2013, 177: 1-47.

[12] Li D, Kaner RB. Shape and Aggregation Control of Nanoparticles: Not Shaken, Not Stirred. J. Am. Chem. Soc., 2006, 128(3): 968-975.

[13] Zhang X, Goux WJ, Manohar SK. Synthesis of Polyaniline Nanofibers by “Nanofiber Seeding”. J. Am. Chem. Soc., 2004, 126(14): 4 502-4 503.

[14] Anilkumar P, Jayakannan M. Large-scale Synthesis of Polyaniline Nanofibers Based on Renewable Resource Molecular Template. J. App. Poly. Sci., 2009, 114: 3 531-3 541.

[15] Long YZ, Li MM, et al. Recent Advances in Synthesis, Physical Properties and Applications of Conducting Polymer Nanotubes and Nanofibers. Prog. Poly. Sci., 2011, 36: 1 415-1 442.

[16] Song E, Choi J. Conducting Polyaniline Nanowire and Its Applications in Chemiresistive Sensing. Nanomaterials, 2013, 3(3): 498-523.

[17] Rahy A, Yang D. Synthesis of Highly Conductive Polyaniline Nanofibers. Mater. Lett., 2008, 62(28): 4 311-4 314.

[18] Kavitha B, Kumarand K, Narsimlu N. Synthesis and Characterization of Polyaniline Nano-fibers. Ind. J. Pure Appl. Phys., 2013, 55: 207-209.

[19] Klug H, Alexander L. X-Ray Diffraction Procedures: For Polycrystalline and Amorphous Materials, 1974 2nd ed. New York: John Wiley and Sons. 1-992.

[20] Mahajan CM, Godbole AG, et al. Characterization of Transparent Conducting Al: ZnO Thin Films Deposited by Chemical Spray Pyrolysis. Advanced Materials Research, 2009, 67: 103-108.

[21] Mahajan CM, Pendharkar M, et al. Spray Deposited Nanocrystalline ZnO Transparent Electrodes: Role of Precursor Solvent. Journal of Nano- and Electronic Physics, 2016, 8(2): 2026

[22] Mostafaei A, Zolriasatein A. Synthesis and Characterization of Conducting Polyaniline Nanocomposites Containing ZnO Nanorods. Progress in Natural Science: Materials International, 2012, 22: 273-280.

[23] Dong C, Xiao K, Chen T, et al. Characterization and Comparison of Conducting Polyaniline Synthesized by Three Different Pathways. J. Wuhan Univ. Technol.-Mat. Sci. Ed., 2011, 26: 1 068-1 072.

[24] Giri S, Ghosh D, Das CK. Effect of Ruthenium (III) Incorporation in Polyaniline Backbone: Materials for Supercapacitor Energy Storage Application. Nano, 2013, 8(3): 1 350 026

[25] Tang SJ, Wang AT, et al. Polymerization of Aniline under Various Concentrations of APS and HCl. Polymer Journal, 2011, 43: 667-675.

[26] Dutt S, Siri PF. Controlling the Polypyrrole Microstructures Using Swollen Liquid Crystals as Structure Directing Agent. J. Appl. Polym. Sci., 2014, 4(10): 105 305

[27] Qiang J, Yu Z, et al. Polyaniline Nanofibers Synthesized by Rapid Mixing Polymerization. Synth. Met., 2008, 158: 544-547.

[28] Stejskal J, Kratochvil P, Radhakrishnan N. Polyaniline Dispersions 2. UV-Vis Absorption Spectra. Synth. Met., 1993, 61: 225-231.