Tunable electrical conductivity and dielectric properties of triglycine sulfate-polypyrrole composite

Abstract Triglycine sulfate (TGS) crystals were grown from aqueous solution using a slow evaporation technique. Polypyrrole (PPy)/TGS composites were prepared by ex situ technique employing solvent casting method. TGS crystal showed a second-order phase transition at 49 °C, which confirms its ferroelectric nature. The XRD pattern of PPy/TGS composites showed the effective filler-polymer matrix interaction. The morphologies of the composites were analyzed through field emission transmission electron microscopy. A gradual increment in DC conductivity of PPy was observed with increase in temperature, revealing its semi-conducting behavior. PPy/TGS composites also demonstrated a similar trend but with drastic decrement in conductivity value, highlighting the insulating behavior of TGS. The dielectric loss of the composites was significantly lower compared to PPy. Despite low dielectric permittivity, PPy/TGS composite can be effectively utilized as memory devices due to its low dielectric loss.

[1]  S. Bose,et al.  In-situ synthesis and characterization of electrically conductive polypyrrole/graphene nanocomposites , 2010 .

[2]  A. Venkataraman,et al.  Transport Properties of Polypyrrole Films Doped with Sulphonic Acids , 2009 .

[3]  Synthesis and characterization of polypyrrole dodecylbenzenesulfonate‐titanium dioxide nanocomposites , 2010 .

[4]  J. Novotný,et al.  Broadband infrared detectors on the basis of PATGS/Pt(IV) single crystals , 2005 .

[5]  C. L. Choy,et al.  Properties of triglycine sulfate/poly(vinylidene fluoride-trifluoroethylene) 0-3 composites , 2006 .

[6]  David A. Hall,et al.  Nonlinear dielectric properties of particulate barium titanate–polymer composites , 2008 .

[7]  B. Satish,et al.  Piezoelectric properties of ferroelectric PZT-polymer composites , 2001 .

[8]  K. Sreenivas,et al.  Growth of 4-(dimethylamino) benzaldehyde doped triglycine sulphate single crystals and its characterization , 2009 .

[9]  S. Bose,et al.  Electrochemical performance of a graphene–polypyrrole nanocomposite as a supercapacitor electrode , 2011, Nanotechnology.

[10]  E. H. El-Ghazzawy,et al.  Study of dielectric properties of polypyrrole prepared using two different oxidizing agents , 2006 .

[11]  A. Epstein,et al.  Electron spin resonance signal of nanocomposite of conducting polypyrrole with inorganic clay , 2004 .

[12]  Chao Yang,et al.  Acid blue AS doped polypyrrole (PPy/AS) nanomaterials with different morphologies as electrode materials for supercapacitors , 2011 .

[13]  S. K. Srivastava,et al.  Enhancements in Conductivity and Thermal Stabilities of Polypyrrole/ Polyurethane Nanoblends , 2011 .

[14]  P. Ramasamy,et al.  Growth of TGS single crystal by conventional and SR method and its analysis on the basis of mechanical, thermal, optical and etching studies , 2008 .

[15]  N. Theresita Shanthi,et al.  Growth, structural, mechanical, spectral and dielectric characterization of NaCl-added Triglycine sulfate single crystals , 2009 .

[16]  Tzong‐Ming Wu,et al.  Synthesis, characterization, and electrical properties of polypyrrole/multiwalled carbon nanotube composites , 2006 .

[17]  S. R. Vadera,et al.  Study of the dielectric properties of barium titanate–polymer composites , 2006 .

[18]  Ravindra B. Lal,et al.  Growth and properties of triglycine sulfate (TGS) crystals: Review , 1993 .

[19]  P. Ramasamy,et al.  Investigations on the electrical and mechanical properties of triglycine sulphate single crystals modified with some rare earth metal ions , 2003 .

[20]  R. Lal,et al.  Growth and Characterization of Doped TGS Crystals for Infrared Devices , 2002 .

[21]  Qiang Wang,et al.  Polypyrrole/Silicon Carbide Nanocomposites with Tunable Electrical Conductivity , 2010 .

[22]  Yen-Wen Lin,et al.  Synthesis and characterization of conductive polypyrrole/multi-walled carbon nanotubes composites with improved solubility and conductivity , 2009 .

[23]  J. Zha,et al.  Improving dielectric properties of BaTiO₃/ferroelectric polymer composites by employing surface hydroxylated BaTiO₃ nanoparticles. , 2011, ACS applied materials & interfaces.

[24]  S. Im,et al.  Preparation and characterization of polyaniline nanoparticles synthesized from DBSA micellar solution , 2002 .