Table 1

Assignments of the main silica bands in the 700- to 4,000 cm−1 region
Band maximum (KBr powder, cm−1) Assignmenta Reference
3,745 ν (isolated silanol groups) Si-OH [38,40]
3,700 to 3,000 ν hydrogen-bonded silanols (overlapping of the stretching modes in hydrogen-bonded hydroxyl bands produced by O-H bonds in adsorbed water and Si-OH) [38,40]
1,867 and 1,980 Si-O-Si stretching modes [38,40]
Approximately 1,628 to 1,630 Proton-containing components σOH (silanol groups and the deformation vibrations of the O-H groups in physically adsorbed molecular water at the silica surface) [37-39]
Approximately 1,083 Si-O-Si stretching [38,40]
1,000 to 1,300 νas, anti-symmetric stretching of Si-O-Si bonds [38]
932 to 939 Si-OH stretching [38,40]
Approximately 809 Bending vibration of Si-O-Si bonds [38,40]
Approximately 790 Bending modes in Si-OH bonds [38,40]

aνas/s, asymmetric/symmetric stretching mode.

Azizova et al.

Azizova et al. Nanoscale Research Letters 2014 9:234   doi:10.1186/1556-276X-9-234

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