Ultrasensitive detection of nitroexplosive – picric acid via a conjugated polyelectrolyte in aqueous media and solid support

Abstract

Picric acid (PA) detection at parts per trillion (ppt) levels is achieved by a conjugated polyelectrolyte (PMI) in 100% aqueous media and on a solid platform using paper strips and chitosan (CS) films. The unprecedented selectivity is accomplished via combination of ground state charge transfer and resonance energy transfer (RET) facilitated by favorable electrostatic interactions.

Pyrene‐functional star polymers as fluorescent probes for nitrophenolic compounds

“…These C 5 ‐H hydrogen atoms can make effective hydrogen bonding with NACs and it appears to be as a clear explanation for the sensitivity of the pyrene‐functional polymers in this study. On the other hand, higher QE of nitrophenols, compared to other nitroaromatics in this study, is thought to arise from the contribution of their strongly polarized OH bonds on their binding affinity by interacting with CH and NNN parts of triazole groups on the pyrene‐functional star‐shaped and linear copolymers . Since, phenol itself did not make any quenching effect on the fluorescence emission of S1‐Pyr (Supporting Information Figure S27).…”

Amine decorated polystyrene nanobeads incorporating π-conjugated OPV chromophore for picric acid sensing in water

“…In this context, polymer based sensors always hold superiority in terms of high quantum efficiency, tunable emission, etc. However, in such sensors, lack of specic binding site for the interaction with analytes [19][20][21] along with multistep tedious synthesis, 19,21,22 sometime limits their application. Additionally, interference of other nitro-organics [22][23][24][25] or some heavy metal ions 20,25,26 e.g.…”

A Hydrogen‐Bond‐Assisted CHEF Approach for Colorimetric and Fluorescence Recognition of Picric Acid and Its Solid‐Phase Extraction by an Immobilized Probe

“…Recently, significant number of probes/ receptors have been designed and synthesised for fluorescence recognition of bioand environmental relevant molecules. [1][2][3][4][5][6][7][8][9] Selective recognition of toxic and explosive materials have attracted significant research interest. [10][11][12] Well organised terror attacks in different parts of the world have prompted researchers to explore facile, efficient and prompt detection of explosive molecules, including picric acid (PA), nitro-aromatics (NACs), nitro-amines, nitroesters and peroxides.…”