Jump to main content
Jump to site search

Issue 16, 2021
Previous Article Next Article

Development of a reusable fluorescent nanosensor based on rhodamine B immobilized in Stöber silica for copper ion detection

Author affiliations

Abstract

This work has the goal of developing and evaluating a reusable fluorescent nanosensor for detection of Cu(II) ion in aqueous solution, based on the immobilization of rhodamine B in silica nanoparticles prepared according to a modified Stöber method. In order to do this, a standard ammonium hydroxide ethanolic solution was mixed to ethanol under constant stirring, followed by the addition of tetraethoxysilane (TEOS). To immobilize the fluorescent reagent in the silica nanoparticles, rhodamine B ethanolic solution was added to the reacting mixture at different times (2; 3; 4 and 5 h) after starting the synthesis (which always lasts 7 h). The nanosensor obtained with the addition of rhodamine B after 5 h of synthesis showed the best sensitivity, measured as the fluorescence quenching, which was proportional to Cu(II) ion. The nanosensor was selective to Cu(II) ions and showed a linear range from 2.0 to 12.0 μmol L−1, detection limit of 0.40 μmol L−1, quantification limit of 1.3 μmol L−1, response time of 50 s, being possible to be reused 3 times. The nanosensor was applied to the determination of Cu(II) in sugar cane spirit and the results obtained did not show significant differences from those obtained by atomic absorption spectrometry at a confidence level of 95%.

Graphical abstract: Development of a reusable fluorescent nanosensor based on rhodamine B immobilized in Stöber silica for copper ion detection

Back to tab navigation

Supplementary files

Article information


Submitted
30 Jan 2021
Accepted
05 Apr 2021
First published
12 Apr 2021

Anal. Methods, 2021,13, 1970-1975
Article type
Paper

Development of a reusable fluorescent nanosensor based on rhodamine B immobilized in Stöber silica for copper ion detection

R. da Silva Fernandes and I. M. Raimundo, Anal. Methods, 2021, 13, 1970
DOI: 10.1039/D1AY00168J

Social activity

Search articles by author

Spotlight

Advertisements