Novel SiO₂-Deposited CaF₂ Substrate for Vibrational Sum-Frequency Generation (SFG) Measurements of Chemisorbed Monolayers in an Aqueous Environment

Authors: Padermshoke, Adchara; Konishi, Shouta; Ara, Masato; Tada, Hirokazu; Ishibashi, Taka-Aki

Source: Applied Spectroscopy, Volume 66, Issue 6, Pages 156A-170A and 609-730 (June 2012) , pp. 711-718(8)

Publisher: Society for Applied Spectroscopy

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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.

Supplementary Data: 1 item

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

Document Type: Research article

DOI: http://dx.doi.org/10.1366/11-06583

Affiliations: 1: Center for Quantum Life Sciences, Hiroshima University, Higashi-Hiroshima, 739-8530, Japan

Publication date: 2012-06-01

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