Preparation and Characterization of Conjugated Composite of Kevlar and p-Polyphenylenediamine with a Great Light Sensing Behavior

Abstract

A novel conductive and conjugated composite, comprising Kevlar and p-polyphenylenediamine (Kevlar/PPPD) nanocomposite, was successfully synthesized. These techniques provided valuable insights into the structural and optical properties of the Kevlar composite, affirming its potential for applications in polymer photodetectors. Subsequently, the Kevlar/PPPD nanocomposite underwent rigorous testing to evaluate its performance as a photodetector. During these experiments, the current density generated by the nanocomposite (J_ph) was measured under two distinct conditions: in the absence of light (dark) and in the presence of light. The results revealed a notable increase in current, rising from 0.32 mA in the dark to 0.58 mA under illuminated conditions. Additionally, the study assessed two crucial parameters, namely photoresponsivity (R) and specific detectivity (D). The R values displayed a consistent decrease, transitioning from an initial value of 2.7 mA/W to a lower value of 1.65 mA/W. Similarly, the specific detectivity (D) values declined from 6.2×10⁷ to 3.8×10⁷ Jones, corresponding to wavelengths of 340 and 540 nm, respectively. What sets this research apart is the Kevlar/PPPD composite’s ability to respond effectively to a range of wavelengths, encompassing ultraviolet (UV), visible (Vis), and near-infrared (IR) regions. This broad-spectrum responsiveness positions the Kevlar composite as a highly promising candidate for various photodetection applications. Consequently, the Kevlar/PPPD composite demonstrates its versatility and potential suitability for deployment as a photodetector in a diverse array of applications.