Turn‐off Fluorescent Sensing of Energetic Materials using Protonic Acid doped Polyaniline: A Spectrochemical Mechanistic Approach

The trace detection of energetic materials (EMs) is a challenge due to the very low vapor pressure possessed by these compounds. Polyaniline (PAni) possesses variable oxidation and reduction states, which makes it strike different from other conducting polymers in understanding the mechanism of fluo...

Full description

Saved in:
Bibliographic Details
Published in:Zeitschrift für anorganische und allgemeine Chemie (1950) 2021-02, Vol.647 (4), p.331-340
Main Authors: Patil, Veerabhadragouda B., Ture, Satish A., Yelamaggad, Channabasaveshwar V., Nadagouda, Mallikarjuna N., Venkataraman, Abbaraju
Format: Article
Language:English
Subjects:
Conducting polymers
Cyclic voltammetry
Dimethylformamide
Direct reduction
Doped polyaniline
Electron transfer
Energetic materials
Fluorescence
Fluorescence quenching
Limit of detection
Nanofibers
Oxidation
PETN
Polyanilines
Quenching
Raman spectroscopy
Selectivity
Trinitrotoluene
Vapor pressure
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The trace detection of energetic materials (EMs) is a challenge due to the very low vapor pressure possessed by these compounds. Polyaniline (PAni) possesses variable oxidation and reduction states, which makes it strike different from other conducting polymers in understanding the mechanism of fluorophore‐analyte interaction leads to the designing of selectivity and sensitivity of analytes; also, fluorophore as a sensing device. The present work is aimed at trace detection of some very prominent EMs; nitroarenes viz., 1,3,5‐trinitroperhydro‐1,3,5‐triazine (RDX), trinitrotoluene (TNT); nitramines viz., hexanitrohexaazaisowurtzitane (CL‐20) and nitro ester viz., pentaerithroltetraniterate (PETN) employing para‐toluenesulfonic acid as a dopant for PAni nanofibers (P‐PAni). The P‐PAni helps overcome the dual difficulties of PAni, i.e., solubility and removal of π stacking when dimethylformamide (DMF) is used as a solvent. P‐PAni showed good quenching response and selectivity towards EMs, with the LOD being the best for CL‐20 (0.717 μM·L–1). The sensing studies further collaborated with the Cyclic Voltammetry, FTIR and Raman Spectroscopy studies gave a detailed understanding of the bipolaron‐polaron transition mechanism accompanying the electron transfer process in the fluorescence quenching study.
ISSN:0044-2313
1521-3749
DOI:10.1002/zaac.202000321