Functionalization of CsPbBr3 perovskite with a new ligand chemistry for reliable and sensitive fluorescence detection of abscisic acid plant hormone

초록

In this study, water-dispersible CsPbBr3@DCTA perovskite quantum dots (PQDs) were successfully fabricated by functionalizing with a new ligand namely 2,2 ',2 '',2"-(trans-cyclohexane-1,2-diylbis (azanetriyl) tetra acetic acid hydrate (DCTA). The as-fabricated CsPbBr3@DCTA PQDs act as a probe for the fluorescence detection of phytohormone abscisic acid (ABA). The surface modification with 2,2 ',2 '',2"-(trans-cyclohexane-1,2-diylbis (azanetriyl) tetra acetic acid hydrate (DCTA) ligand has noticeably enhanced the aqueous stability and biocompatibility of CsPbBr3 PQDs, making them suitable for bio-sensing agents. The synthesized CsPbBr3@DCTA PQDs exhibited a strong fluorescence emission at 520 nm under 370 nm excitation, displaying a quantum yield of 13.24%. The sensing mechanism was based on fluorescence quenching due to ABA-induced aggregation, favoring to construct a calibration graph in the range of 0.1 to 300 mu M. Furthermore, the sensing capability was validated by assaying ABA in real samples, including tomato juice and rice water, showing high recovery rates (96.21%- 101%) and low RSD values (0.32%-1.62%). Thus, CsPbBr3@DCTA PQDs could be a potential fluorescent probe to assay ABA in real samples.

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