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131903

Sigma-Aldrich

Tetraethyl orthosilicate

reagent grade, 98%

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Synonym(s):
Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate
Linear Formula:
Si(OC2H5)4
CAS Number:
78-10-4
Molecular Weight:
208.33
Beilstein:
1422225
EC Number:
201-083-8
MDL number:
MFCD00009062
UNSPSC Code:
12352300
PubChem Substance ID:
24848042
NACRES:
NA.23

grade

reagent grade

Quality Level

200

vapor density

7.2 (vs air)

vapor pressure

<1 mmHg ( 20 °C)

Assay

98%

form

liquid

refractive index

n20/D 1.382 (lit.)

bp

168 °C (lit.)

density

0.933 g/mL at 20 °C (lit.)

SMILES string

CCO[Si](OCC)(OCC)OCC

InChI

1S/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3

InChI key

BOTDANWDWHJENH-UHFFFAOYSA-N

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General description

Tetraethyl orthosilicate(TEOS) is a colorless liquid alkoxide widely used as precursor to deposition of silicon dioxide (SiO2) thin films. It is also utilized in hydrogels, nanoparticle-based drug delivery systems, and chemical crosslinking of polymers.

Application

Tetraethyl orthosilicate can be used:
  • As an anti-solvent to fabricate efficient perovskite layer for inverted planar solar cells with enhanced power conversion efficiency and reproducibility. TEOS helps to achieve high-quality perovskite films with reduced density of defects, and thus slower carrier recombination.
  • As a sol-gel precursor to synthesize SiO2-TiO2 anti-reflective self-cleaning coatings for solar cells.
  • To fabricate nano silica functionalized crosslinked hybrid membranes for proton exchange membrane fuel cell applications. These membranes have better proton conductivity and thermal stability.
  • To prepare poly(vinylidene fluoride)/TEOS matrix separator to enhance the performance of Li-ion batteries. The separator exhibits excellent electrolyte retention and wettability.

Commonly used as a precursor to prepare xerogel
Will interact with dodecylamine in the formation of intercalation compounds of H+-magadiite and used in a study of mixed-metal bioactive glasses.

Features and Benefits

  • Excellent adhesion on substrates
  • Uniform film deposition
  • Cross-linker to introduce polymer strands into hydrogel

Pictograms

FlameExclamation mark
GHS02,GHS07

Signal Word

Warning

Hazard Statements

H226,H319,H332,H335

Hazard Classifications

Acute Tox. 4 Inhalation - Eye Irrit. 2 - Flam. Liq. 3 - STOT SE 3

Target Organs

Respiratory system

WGK

WGK 1

Flash Point(F)

113.0 °F

Flash Point(C)

45 °C

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Regulatory Information

危险化学品

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. Is anything else needed to use Product 131903, Tetraethyl Orthosilicate in a hydrolysis reaction?

    An acid or alkali catalyst is needed to do a hydrolysis reaction to free the silanol group for use.

  4. What is the solubility of Product 131903, Tetraethyl Orthosilicate?

    According to the 13th Edition of the chemicals encyclopedia published by the Royal Society of Chemistry, Tetraethyl Orthosilicate is practically insoluble in water and is slowly decomposed by it.  It is miscible with alcohol.

  5. Product 131903, Tetraethyl orthosilicate  is commonly used as a precursor to prepare xerogel.  What is xerogel?

    A xerogel is a solid formed from a gel by drying with unhindered shrinkage.  Xerogel usually retains high porosity and large surfaced area, along with very small pore size. 

  6.  How can I purify Product 131903, Tetraethyl Orthosilicate?

    Fractionate through an 80cm Podbielniak type column with heated jacket and partial take-off head.  [Purification of Laboratory Chemicals Fourth Ed]

  7. What is the freezing point of Product 131903, Tetraethyl Orthosilicate?

    The freezing point is ~85°C.

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    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  9. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

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