Novel SiO 2 -Deposited CaF 2 Substrate for Vibrational Sum-Frequency Generation (SFG) Measurements of Chemisorbed Monolayers in an Aqueous Environment

Abstract

A novel SiO₂-deposited CaF₂ (SiO₂/CaF₂) substrate for measuring vibrational sum-frequency generation (SFG) spectra of silane-based chemisorbed monolayers in aqueous media has been developed. The substrate is suitable for silanization and transparent over a broad range of the infrared (IR) probe. The present work demonstrates the practical application of the SiO₂/CaF₂ substrate and, to our knowledge, the first SFG spectrum at the solid/water interface of a silanized monolayer observed over the IR fingerprint region (1780–1400 cm⁻¹) using a back-side probing geometry. This new substrate can be very useful for SFG studies of various chemisorbed organic molecules, particularly biological compounds, in aqueous environments.

Keywords

Vibrational SFG spectroscopy Sum-frequency generation Chemisorbed organic monolayers Silane-based surface immobilization

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