Reusable, Ultrasensitive, Patterned Conjugated Polyelectrolyte–Surfactant Complex Film with a Wide Detection Range for Copper Ion Detection

Abstract

Conjugated polyelectrolytes (CPEs) are emerging as promising materials in the sensor field because they enable high-sensitivity detection of various substances in aqueous media. However, most CPE-based sensors have serious problems in real-world application because the sensor system is operated only when the CPE is dissolved in aqueous media. Here, the fabrication and performance of a water-swellable (WS) CPE-based sensor driven in the solid state are demonstrated. The WS CPE films are prepared by immersing a water-soluble CPE film in cationic surfactants of different alkyl chain lengths in a chloroform solution. The prepared film exhibits rapid, limited water swellability despite the absence of chemical crosslinking. The water swellability of the film enables the highly sensitive and selective detection of Cu 2+ in water. The fluorescence quenching constant and the detection limit of the film are 7.24 × 10 6 L mol −1 and 4.38 nM (0.278 ppb), respectively. Moreover, the film is reusable via a facile treatment. Furthermore, various fluorescent patterns introduced by different surfactants are successfully fabricated by a simple stamping method. By integrating the patterns, Cu 2+ detection in a wide concentration range (nM−mM) can be achieved.

Conjugated Polyelectrolytes: Illuminating the Path to Neurodegenerative Disorders Detection and Treatment

“…CPEs can be built with certain ligands that have great selectivity for various metal ions, enabling personalized treatments at various stages of neurodegeneration . CPEs possessing distinct metal-chelating properties exhibit promising prospects in revolutionizing the strategies for addressing neurodegenerative disorders and environmental challenges. − The unique combination of optical, electrochemical, and metal-binding characteristics exhibited by these entities present a vast array of potential applications, spanning from tailored therapeutic interventions targeting AD.…”

Portable and non-invasive fluorescent thin films from photocatalytically active carbon dots for selective and trace-level detection of picric acid

“…[43][44][45] Many polymeric platforms have been reported to form a film-based fluorescent platform for detecting potential pollutants by incorporating various PL sensing probes. Howsoever, most of the FL polymeric sensor strips or films reported so far [46][47][48] lack the combined merits of a simple fabrication procedure, high LOD with good selectivity, portability, less toxicity, least photo bleachability and multicycle detection ability. Cross-linking with starch, 49 physical incorporation with PVA, 50 TLC plates 51 or SiO 2 based nanomesh scaffold technology, 52 etc.…”