Organophosphonates characterization using MP-SPR

Application Note #150

SAM thicknesses: vinylphosphonic (VPA), octylphosphonic (OPA), and tetradecylphosphonic acid (TPA).

Phosphonic acids adsorption behavior was studied using Multi-Parametric Surface Plasmon Resonance (MP-SPR). Tetradecylphosphonic acid (TPA) adsorption onto differently treated gold surfaces was measured. Piranha and ammonia/hydrogenperoxide  treatments were found to be the most optimal for  the SAM formation. TPA, vinylphosphonic acid (VPA), and octylphosphonic acid (OPA) adsorption onto  the piranha treated surface was studied, and the thickness and the refractive index of the deposited layers were determined. The  SAMs  were  0.68 nm (VPA), 1.41 nm (OPA) and 1.73 nm (TPA) thick, and thicknesses were in good agreement with the expected molecular length.

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