Electrical conductivity manipulation and switching phenomena of poly(p-phenylenebenzobisthiazole) thin film by doping process

Abstract

Current-voltage (i-v) characteristics of dry poly(p-phenylenebenzobisthiazole) (PBZT) thin films are studied before and after various doping processes. Conductivity switching phenomenon is observed after doping with HCl and H 2 SO 4 acidic solutions at different concentration levels. The conductivity is 10 folds higher in a relatively high sweeping voltage range (0.2-0.3 V) than that sweeping in a lower range of 0-0.1 V. The conductivity switching phenomenon becomes more obvious with an increase of acid concentration. HCl shows to be more favorable for a quick and efficient switching behavior than H 2 SO 4 . The reduction of PBZT with metal (Fe, Cu and Pd) doping process produces linear conductivity along the whole sweeping range of voltage. A 30% electrical conductivity enhancement is observed after applying an external dc voltage on the acid soaked PBZT film and different voltages enhance the conductivity to the same level. The conductivity returns gradually after removing the applied voltage. Four-point probe conductivity measurements, FT-IR, scanning electron microscopy, EDAX elemental analysis, X-ray diffraction and TGA thermal analysis were used for better understanding the doping processes and conductivity switching mechanisms. A molecular structure transformation during the doping process is proposed.

Enhanced Electrical Switching and Electrochromic Properties of Poly(p‐phenylenebenzobisthiazole) Thin Films Embedded with Nano‐WO3

“…These casted films clearly display electrical switching phenomenon that behaves like a diode, in which the current is strongly dependent on the applied voltage. This electric characteristic is consistent with our prior results obtained from the as‐received PBZT thin films through acid doping process 31. In this case, the voltage‐dependent (non‐linear) current can be roughly divided into three stages, the first stage is from −1.0 V to −0.5 V, which represents the high electrical conductivity together with a transition to a lower conductivity; the second stage is from −0.5 V to 0.5 V, which reflects a lower conductivity from the linear I–V curve; the third stage is above 0.5 V, and the electrical conductivity switches to a higher value.…”

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

“…Since the behavior of PNCs is greatly influenced by their microstructures, the properties of matrix and fillers, filler distributions, interfacial bonding, and processing method should all be considered [123,126]. Mechanical properties of composites are more related to particle size, loading, and filler-matrix interfacial adhesion [44].…”

Rapid Determination of Phenolic Compounds in Water Samples: Development of a Paper‐based Nanobiosensor Modified with Functionalized Silica Nanoparticles and Potato Tissue

“…where I p (A) is the peak current, n is the number of electrons transferred in the redox reaction (n = 1 for Fe 3 + / Fe 2 + ), A (cm 2 ) is the electroactive surface area, D (cm 2 /s) is the diffusion coefficient (6 × 10 6 for Fe 3 + /Fe 2 + ), C (M) is the concentration of the reaction species in the electrolyte (0.01 M for Fe 3 + /Fe 2 + ) and v (V/s) is the scan rate (0.1 V/ s) [41,42]. In this study the calculated electroactive surface area for SN-PA/SPE was 6.92 × 10 À 11 cm 2 .…”