Abstract
The ON-OFF ratiometric fluorescence formaldehyde (FA) reassuring system was introduced based on the surface ligand crafting of CdTe/CdS Quantum dots (QDs) by 3-(6-hydrazinyl-1,3-dioxo-benzoisoquinolinyl) propanoic acid (HBQP) for the sensitive and selective determination of formaldehyde (FA) gas. The FA react with HBQP capped CdTe/CdS QDs, produced an optically active species at emitting fluorescence at 540 nm and ultimately disruption QDs surface leads naught fluorescence at 666 nm. The HBQP-QDs sense FA in liquid (phosphate buffer) and in gaseous phase by a solid sensor embedding on cellulose paper. The dual fluorescent change was linearly related to FA concentrations at the range of 1 to 28 μM with a lower detection limit of 0.49 μM as well the colour change was observed with necked eye.
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