Development of inorganic perovskite quantum dots-based optical sensor for toxic Cd2+ metal ion detection
Journal
Optik
Journal Volume
337
Start Page
172462
ISSN
0030-4026
Date Issued
2025-10
Author(s)
Hsieh, Chieh-Wen
Singh, Rajan Kumar
Meena, Mohan Lal
Lu, Shao-An
Gupta, Karan Kumar
Lin, Bo Chen
Abstract
CsPbBr3-CsPb2Br5 nanocrystals (CNCs) with high photoluminescence intensity were synthesized using the ultrasonication process under ambient conditions. The prepared nanocrystals were found to be quenched in luminescence in the presence of cadmium (Cd2+) ions due to the decomposition of highly luminescent CsPbBr3. The time-resolved photoluminescence lifetime of the Cd2+ ions-quenched CNCs was decreased from 26.61 to 19.84 ns. The decreased lifetime of the quenched sample indicated that the excitons of the nanocrystals were trapped from Cd2+ ions and released energy in non-luminous paths. The broad detection range of Cd2+ ions using CNCs was from 10−3 to 10−5 M. The synthesized nanocrystals modified with ammonia hydroxide displayed strong fluorescence quenching. The addition of ammonia hydroxide to CNCs reduced the amounts of ligands on the surface of nanocrystals, which enhanced the interaction between Cd2+ ions and CNCs. The interaction of Cd2+ ions with CNCs led to strong fluorescence quenching. The detection limit of Cd2+ ions using the ammonia hydroxide-modified CNCs was reached to 10−6 M, revealing the high sensitivity of the prepared nanocrystals.
Subjects
Chemical sensitivity
Fluorescence quenching
Perovskite quantum dots
Toxic metal ion detection
Publisher
Elsevier BV
Type
journal article