Novel SiO2-deposited CaF2 substrate for vibrational sum-frequency generation (SFG) measurements of chemisorbed monolayers in an aqueous environment.
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 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.
Center for Quantum Life Sciences, Hiroshima University, Higashi-Hiroshima, Japan.
Adchara
A
Padermshoke
Shouta
S
Konishi
Masato
M
Ara
Hirokazu
H
Tada
Taka-Aki
TA
Ishibashi
D000388:Air; D002124:Calcium Fluoride / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods*; D014867:Water / Q000737:chemistry
D014867:Water; D012822:Silicon Dioxide; D002124:Calcium Fluoride