All-organic PANI–DBSA/PVDF dielectric composites with unique electrical properties

Two percolation thresholds and remarkably high dielectric permittivity in pristine carbon nanotube/elastomer composites

“…A high dielectric constant is desirable for the mentioned applications of DEs, but the existing DE materials (Keplinger et al 2012;Kofod et al 2003;Stoyanov et al 2013) have rather low dielectric constants. To substantially improve the electrical properties, conducting fillers such as metals, conducting polymers, carbon nanotubes (CNTs) and carbon black are usually employed (Dang et al 2011;Hu et al 2014;Lu et al 2006;Shehzad et al 2013bShehzad et al , c, 2014Wang et al 2013). Among these fillers, CNTs stand out because of their high surface area and exotic electrical, mechanical and thermal properties.…”

Recent progress on nanostructured conducting polymers and composites: synthesis, application and future aspects

“…Compared to inorganic dielectric materials (i. e., ferroelectric ceramics) [246][247][248][249], polymer-based dielectric materials have received tremendous attentions because of their excellent mechanical properties, high electric breakdown field and ease of synthesis [250][251][252][253][254]. NCPs as a new class of conducting organic materials provided a unique opportunity as conducting fillers in polymer-based dielectric composites [255][256][257][258][259][260][261][262][263]. Different from other conductive fillers, NCPs exhibit two advantages: i) their electrical conductivity can be adjusted over a broad range by simple doping or de-doping process, which will give rise to unique dielectric/electric properties, and ii) their mechanical properties are similar to dielectric polymer matrix that offers excellent compatibility with the polymer matrix [264][265][266][267][268].…”

“…In a recent study, the interfacial polymerization method and encapsulation technique were used to guarantee a uniform distribution of NCPs in an insulated polymer matrix. Wang et al [255] and Shehzad et al [256] both worked on further improvement of the compatibility of the PANI in the polymer matrix using an organic dopants such as dodecylbenzene sulfonic acid (DBSA) and perfluorosulfonic acid (PFSA). The dielectric permittivity at the percolation threshold of 2.9 wt.% fillers, were raised by 50-fold compared to the polymer matrix at 100 Hz.…”

Surfactant Incorporated Co Nanoparticles Polymer Composites with Uniform Dispersion and Double Percolation

“…Low value of electrical percolation is the index of good dispersion [13]. It is also observed that shape of the percolation curve and value of percolation threshold depend strongly upon different factors like temperature, pressure, aspect ratio of fillers, additives used, and method of preparation [11,[14][15][16].…”