Open AccessFluorescence properties of yellow light emitting carbon quantum dots and their application for effective recognition of heavy metal ions in aqueous medium
Author(s) -
Raj Savan K.,
Rathod Nehal H.,
Tripathi Balram,
Patidar Rajesh,
Kulshrestha Vaibhav
Publication year - 2021
Publication title -
nano select
Language(s) - English
Resource type - Journals
ISSN - 2688-4011
DOI - 10.1002/nano.202100127
Subject(s) - fluorescence , aqueous solution , raman spectroscopy , metal ions in aqueous solution , materials science , carbon fibers , quenching (fluorescence) , photochemistry , spectroscopy , analytical chemistry (journal) , visible spectrum , fluorescence spectroscopy , ion , quantum dot , photoluminescence , metal , chemistry , optoelectronics , optics , chromatography , physics , organic chemistry , quantum mechanics , composite number , metallurgy , composite material
Water‐dispersible and fluorescence‐stable carbon quantum dots (CQDs) have been synthesized at gram scale using pyrene as carbon precursor by employing the bottom‐up approach. X‐ray diffraction, FTIR, Raman spectroscopy and UV visible spectroscopy confirm the formation of CQDs. TEM images shows that size of the CQDs ranges from 2 to 5 nm. A detailed study of their optical and fluorescence characteristics was performed. Their aqueous dispersion radiates bright yellow light under UV lamp (365 nm). The research work includes derivation of their excitation wavelength, observation of influence of dilution on fluorescence and monitoring of emission intensity for about 4 months. The CQDs can effectively recognize the presence of heavy metal ions in aqueous medium at neutral pH via fluorescence quenching.