Title
Carbazole based nanoprobe for selective recognition of Fe3 +ion in aqueous medium: Spectroscopic insight
Author
Sonali B. Suryawanshi, Prasad G. Mahajan, Anita J. Bodake, Govind B. Kolekar, Shivajirao R. Patil
Year
2017
Journal
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Abstract
A simple carbazole based nanoprobe prepared by reprecipitation method shows selective sensing behavior for Fe3 + ion in aqueous medium. The prepared SDS capped 9-phenyl carbazole nanoparticles (9-PCzNPs) has narrower particle size distribution with an average diameter 35 nm and zeta potential of − 34.3 mV predicted a good stability with negative surface charge over the nanoparticles. The Field Emission Scanning Electron Microscopy (FE-SEM) image showed cubic shape morphology of nanoparticles. The aqueous suspension of SDS capped 9-phenyl carbazole nanoparticles exhibited aggregation induced enhanced red shifted intense emission in comparison with the emission arising from dilute solution of 9-phenyl carbazole in DCM. The cation recognition test based on fluorescence change shows Fe3 + ion induce significant fluorescence quenching, however remaining cations responds negligibly. The obtained quenching data fit into Stern–Volmer relation in the concentration range of 0.0–1.0 μg·mL− 1 of Fe3 + ion solution and the detection limit is 0.0811 μg·mL− 1. The probable mechanism of fluorescence quenching of SDS capped 9-PCzNPs is because of adsorption of Fe3 + ion over the negatively charged surface of NPs through electrostatic interaction. Thus the proposed method was successfully applied for the detection of Fe3 +ion in environmental water sample.
Instrument
FP-8300
Keywords
Fluorescence, Nanostructures, Sensors, Quenching, Materials