Silicon-oxygen (Si-O) — FTIR absorption peaks and assignments

Quick answer

Silicon-oxygen (Si-O) is usually assigned by looking for a recurring cluster of characteristic peaks rather than one exact textbook number. The table below shows where the literature most often places this group in FTIR, ranked by accumulated evidence.

Characteristic FTIR peaks for Silicon-oxygen (Si-O)

Showing the 30 best-supported peaks of 757 total for Silicon-oxygen (Si-O).

Possible materials

Spectrum logic

A functional-group assignment becomes more confident when several expected bands appear together. Use this page to find the strongest-supported peaks, then confirm that the same sample exhibits a coherent pattern rather than a single isolated hit.

Real-world usage

These pages are useful for unknown material analysis, peak explanation in reports, polymer troubleshooting, and verifying whether a candidate material family is chemically plausible.

Common mistakes

• Using one functional-group page as a complete material verdict without checking the rest of the spectrum.
• Assuming the strongest band is always the most diagnostic one.
• Forgetting that processing, additives, aging, and mixtures can shift or broaden expected peaks.

Verification advice

Use DSC, GC-MS, or TGA when several material families share similar bands or when mixture effects make the FTIR assignment uncertain.

Literature behind these assignments

• 3429 cm⁻¹ confidence 1.0

  “The FTIR spectra of the cm-1 montmorillonite-carbon nanotube nano filler display bands at 3429, 1076, and 798 which correspond to OH functional groups, Si-O-Si stretching, and Si-O-Si vibration, respectively.”

  Synthesis and Physical Properties Characterization of Montmorillonite-modified Carbon Nanotubes Filler DOI: 10.1088/1757-899X/546/4/042004
• 1089 cm⁻¹ confidence 1.0

  “FTIR spectra showed peaks at 1089 and cm-1, 801 which corresponded to asymmetric and symmetric O-Si-O.”

  Fabrication of Biogenic Silica Nanostructures from Sorghum bicolor Leaves for Food Industry Applications DOI: 10.1007/s12633-020-00379-4
• 1106 cm⁻¹ confidence 1.0

  “cm(cid:2)1, 1040¨1180 Acknowledgments It shows a weak peak at 1106 which is attributed to the stretching vibration of Si-O.”

  Structural characterization of β-SiC nanowires synthesized by direct heating method DOI: 10.1016/j.msec.2005.09.083
• 788 cm⁻¹ confidence 1.0

  “Various peaks 323 cm-1), were detected which correspond to O-Si-O stretching vibrations of silica group (788 -O324 cm-1), CH/C-O stretch for the O-CH and C-OH of sugar unit in cellulose (1034 OH in-plane 325”

  Balan 等 - 2021 - Esterification of residual palm oil using solid ac DOI: 10.1016/j.jtice.2012.07.001
• 1000 cm⁻¹ confidence 1.0

  “In the spectrum peaks are observed cm-1 cm-1 in the region of 1258.88 corresponding to methyl, between 1000 - 1100 a peak cm-1 corresponding to the Si-O-Si bond and a band at 792.10 characteristic of the siloxanes, confirming the presence o”

  Fabrication of a silver particle-integrated silicone polymer-covered metal stent against sludge and biofilm formation and stent-induced tissue inflammation DOI: 10.1038/srep35446
• 1009 cm⁻¹ confidence 1.0

  “3.3 Topographical analysis Si-O-Si modes.20 breathing The spectra display asymmetric cm(cid:1)1, stretching at 1009 which corresponds to the presence of The topographical investigation of pristine the PC, PC/FAC and PC/GFACwerestudiedbyAFM.”

  Thin film encapsulation of nano composites of polycarbonate (PC) for thermal management systems DOI: 10.1039/c4ra10183a
• 1096 cm⁻¹ confidence 1.0

  “The peak shown cm1 at 1096 was tells about the formation of Si-O-Si asymmetric stretching vibration in the fingerprint region [22].”

  Banoth 等 - 2022 - Sustainable Thermochemical Extraction of Amorphous DOI: 10.21203/rs.3.rs-657645/v1
• 522 cm⁻¹ confidence 1.0

  “Si-O in-plane bending vibration of silicate u4 Si-O out-of-plane bending vibration of silicate 522.”

  Theoretical and experimental study of structures and properties of cement paste: The nanostructural aspects of C–S–H DOI: 10.1016/j.jpcs.2011.05.001