Novel SiO 2-deposited CaF 2 substrate for vibrational sum-frequency generation (SFG) measurements of chemisorbed monolayers in an aqueous environment

Adchara Padermshoke, Shouta Konishi, Masato Ara, Hirokazu Tada, Taka Aki Ishibashi

Research output: Contribution to journalArticlepeer-review

Abstract

A novel SiO 2-deposited CaF 2 (SiO 2/CaF 2) 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 SiO 2/CaF 2 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 backside probing geometry. This new substrate can be very useful for SFG studies of various chemisorbed organic molecules, particularly biological compounds, in aqueous environments.

Original languageEnglish
Pages (from-to)711-718
Number of pages8
JournalApplied Spectroscopy
Volume66
Issue number6
DOIs
Publication statusPublished - 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Spectroscopy

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