학술논문
Highly sensitive SPR response of Au/chitosan/graphene oxide nanostructured thin films toward Pb (II) ions.
Document Type
Article
Author
Source
Subject
*SURFACE plasmon resonance
*OPTICAL sensors
*GRAPHENE oxide
*CHITOSAN
*SOLUTION (Chemistry)
*HEAVY metal toxicology
*GOLD oxide
*NANOSTRUCTURED materials
*THIN films
*LEAD compounds
*METAL ions
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Language
ISSN
0925-4005
Abstract
Abstract: Optical sensors based on surface plasmon resonance (SPR) are utilized for detecting toxic heavy metals in solutions. To improve the sensitivity of SPR sensors, nanostructured thin films with active layers can be synthesized. In this study, the response to Pb (II) was measured and compared for SPR sensors incorporating gold–chitosan–graphene oxide (Au/CS/GO) nanostructured thin films and Au/CS films. The characterization of Au/CS/GO using FESEM analysis revealed a film composed of nanosheets with wrinkled, rough surfaces. The results from XRD analysis confirmed the successful incorporation of GO in the prepared films. Additionally, AFM analysis determined that the Au/CS/GO films had a root mean square (rms) roughness of 28.38nm and were considerably rougher than the Au/CS films. Upon exposure to a 5ppm Pb (II) ion solution, the Au/CS/GO films exhibited higher SPR sensitivity, as much as 1.11200ppm−1, than Au/CS films, 0.77600ppm−1. This enhancement of the SPR response was attributed to strong covalent bonding between CS and GO in these films. These results indicated that the Au/CS/GO films show potential for the detection of heavy metal pollution in environmental applications. [Copyright &y& Elsevier]