Sensing of some interesting NACs through fluorescence quenching studies.

摘要

The development of reliable detection of explosives is one of the pressing concerns in antiterrorism efforts and environmental pollution controls. Different sensors have been developed for detection and trace detection of explosive materials and High energy Materials (HEMS). However these are found to have limitation in terms of cost and easy adaptability. In recent studies fluorescence-based sensing technology has emerged as one of the most promising approaches for trace explosives detection due to the advantages such as short response time, excellent sensitivity, and instrumental simplicity. Herein, we report the synthesis of camphor sulfonic acid doped polyaniline (CSA-PANI) synthesised through chemical route and its characterization employing various experimental tools. We report the efficiency of our CSA-PANI as fast, sensitive, selective, reliable and cost effective material for detection of nitro-aromatic explosives (NACs) like picric acid and Para-Nitrotoluene. The successful demonstration through fluorescence quenching of conjugated polymers of NACs is envisaged with N-methyl pyrrolidone as solvent. Quenching efficiency has been estimated by Stern-Volmer equation. The mechanism for the ultra sensitivity of CSA-PANI to detect PA is attributed to the "molecular-wire effect", through photo induced electron transfer (PET) process is evidenced from spectroscopic and redox studies.