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Abstract
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In the present study, a novel double layer film (DLF) composed of Rose Bengal dye and reduced
graphene oxide (RB/rGO-DLF) was fabricated via a facile combined (ultrasonic-spin coating) method as
a silver(I) ion sensor in an aqueous environment. Microscopic and spectroscopic characterizations
confirmed the successful synthesis of RB/rGO-DLF. The morphological results of FE-SEM and AFM
studies confirmed the monotonous and uneven surface of the RB/rGO-DLF. Moreover, XPS analysis also
proved the reaction between silver ions and Rose Bengal immobilized on the rGO structure using
binging energy (B.E.). Leaching of the chemosensor was studied and the results suggest that the
prepared chemosensor is constant during the sensing process without any considerable variation in its
critical characteristic properties such as sensitivity, selectivity and response time. The UV-vis spectra
showed the presence of two different peak intensities at 520 and 557 nm. The first peak can be
attributed to the Ag–RB combination with a response time of 5 minutes at pH 7. The sensing calibration
plot exhibits a linear range between 8.53 107 and 3.39 106 mol L1 of silver ions with a
linear equation of absorbance = 0.116 [Ag+] 0.088 and a correlation coefficient of 0.987. The limit of
detection (LOD) based on 3 sigma of the blank is 9.55 108 M
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