Characterization of the Optical Properties of Heavy Metal Ions Using Surface Plasmon Resonance Technique

Abstract

The aim of this research is to characterize the optical properties of heavy metal ions (Hg<sup>2+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup> and Zn<sup>2+</sup>) using surface plasmon resonance (SPR) technique. Glass cover slips, used as substrates were coated with a 50 nm gold film using sputter coater. The measurement was carried out at room temperature using Kretchmann SPR technique. When the air medium outside the gold film is changed to heavy metal ions solution, the resonance angle shifted to the higher value for all samples of heavy metal ions solution. By our developed fitting program (using Matlab software), the experimental SPR curves were fitted to obtain the refractive index of Hg<sup>2+</sup>, Cu<sup>2+</sup>, Pb<sup>2+</sup> and Zn<sup>2+</sup> ions solution with different concentrations. Both the real and imaginary part of refractive index of the heavy metal ions solution increased with the concentration. The results give the basic idea such that the SPR technique could be used as an alternative optical sensor for detecting heavy metal ions in solution

Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

“…An optical-based sensing method based on surface plasmon resonance (SPR) was designed to identify the potential of the Cs/Fe 2 O 3 thin film to detect Hg 2+ . Figure 1 shows the schematic diagram of the SPR instrument setup [58][59][60][61]. The SPR experiment was carried out by inserting Hg 2+ solutions with different concentration varied from 0.01 to 0.5 ppm.…”

Structural and Optical Studies of Cadmium Sulfide Quantum Dot-Graphene Oxide-Chitosan Nanocomposite Thin Film as a Novel SPR Spectroscopy Active Layer

“…The active layer thin film was tested with deionized water with 0.01 ppm, 0.1 ppm, 1 ppm, and 10 ppm of cobalt ion via surface plasmon resonance. Surface plasmon resonance spectroscopy worked by observing the changes of the refractive index of the active layer due to the interaction of the active layer with the targeted metal ion [35]. Figure 12 shows that there is a resonance angle shift by observing the SPR curve of the active layer in contact with 5 Journal of Nanomaterials the deionized water and cobalt ion.…”

Optical characterization of multi layer thin films using surface plasmon resonance method: From electromagnetic theory to sensor application

“…The experimental and the fitted data are shown in Figure 3. By substituting the values for refractive index of gold film and deionised water [13], the properties of crosslinked chitosan thin film were confirmed, i.e. n (1.540 ± 0.005), k (0.015 ± 0.002) and d (14.0 ± 0.1) nm, using the transfer matrix-based multilayer fitting program developed by Matlab software.…”

“…= cos (13) For the case more than one layer, i.e. the boundary (b) substrate replaces by the interface of another thin film, Equation (11) is still valid.…”