Study of adsorption of some organic molecules in calix[4]resorcinolarene LB films by surface plasmon resonance

Understanding the gas adsorption kinetics of Langmuir-Schaefer porphyrin films using two comparative sensing systems

“…Absorbance spectra of EHO LS films were recorded in the range of 350-800 nm. The second measurement was made using a SPR system which consists of a Kretschmann configuration custom built optical setup [16] incorporating a semi-cylindrical prism (refractive index of 1.515) and optical laser (wavelength of 632.8 nm) the details of which have already been described in another study [17]. A gas cell (PTFE -polytetrafluoroethylene) sealed with a rubber O-ring were integrated to the SPR setup which was placed on the LS films and the reflected light intensity was measured as a function of angle or time depending on the measurement type.…”

“…It is clearly shown that there are observable shifts of the SPR angle after deposition of multilayer EHO films and the magnitude of the corresponding shifts are directly related to the thickness and optical constants of the organic film on the gold surface. The relation can be given by the following expression [25]:…”

Determination of Volatile Organic Compounds by a Novel Polymer Spin-Coated Thin Film and Surface Plasmon Resonance

“…Surface plasmon resonance measurements were carried out using the homemade setup (Kretschmann and Raether 1968) shown in Figure 1. The system consists of a semicylindrical prism (refractive index of 1.515) and a He-Ne laser at 632.8 nm (Nabok et al 1997).…”

“…Coating a thin film on a gold substrate causes a shift of θSPR compared with bare gold. This shift is directly related with the thickness and the optical constants of thin film on gold surface as given by (Nabok et al 1997):…”

“…The broadening of the SPR curves is due to the damping of resonance with increasing film thickness (Ray et al 2000). The curves are also affected by the homogeneity and uniformity of thin film surface (Nabok et al 1997). These undesirable results are more likely seen for thicker films due to the accumulation of molecules.…”