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104817

Trichloro(octadecyl)silane

≥90%

Synonym(s):

Octadecyltrichlorosilane

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25 g
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$224.00
100 g
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$642.00
500 g

Estimated to ship onMay 19, 2026fromMilwaukee Teutonia Distributio

$1,790.00

About This Item

Linear Formula:
CH3(CH2)17SiCl3
CAS Number:
112-04-9
Molecular Weight:
387.93
UNSPSC Code:
12352103
NACRES:
NA.23
PubChem Substance ID:
24846677
EC Number:
203-930-7
Beilstein/REAXYS Number:
1778847
MDL number:
MFCD00000484

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vapor density

>1 (vs air)

Quality Level

100

vapor pressure

<5 mmHg ( 20 °C)

assay

≥90%

refractive index

n20/D 1.459 (lit.)

bp

223 °C/10 mmHg (lit.)

density

0.984 g/mL at 25 °C (lit.)

SMILES string

CCCCCCCCCCCCCCCCCC[Si](Cl)(Cl)Cl

InChI

1S/C18H37Cl3Si/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-22(19,20)21/h2-18H2,1H3

InChI key

PYJJCSYBSYXGQQ-UHFFFAOYSA-N

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General description

Trichloro(octadecyl)silane (OTS) is a high-reactivity alkyltrichlorosilane engineered for the precise deposition of dense, hydrophobic Self-Assembled Monolayers (SAMs) on inorganic and metal oxide substrates.
Its amphiphilic structure, featuring a 18-carbon octadecyl chain and a highly polar trichlorosilyl head group, ensures rapid covalent bonding to surfaces like glass, silicon, and ceramics. This molecular architecture allows for the creation of thin insulating gates and non-polar interphases that effectively shield sensitive electronic components from water vapor and environmental degradation.
Widely recognized as a benchmark material in molecular electronics, OTS provides a terminal methyl handle for tuning the wetting, friction, and adhesion properties of substrates at an ultra-fine scale.
Refined to a ≥90% high-purity specification, this grade is optimized for consistency in research and industrial processes requiring reliable surface passivation and improved compatibility between organic and inorganic phases.

Application

As a foundational molecular building block, OTS is critical for engineering ultra-thin, high-performance interfaces in flexible electronics and sensitive bio-diagnostic platforms.
High-Mobility Nanoelectronics: Primarily used to form Self-Assembled Monolayers (SAMs) on gate dielectrics in Organic Field-Effect Transistors (OFETs). It passivates the surface to reduce charge-trapping, significantly enhancing charge-carrier mobility in materials like pentacene and P3HT.
Graphene Device Optimization: Employed as a substrate modifier for graphene transistors to achieve low intrinsic doping and high carrier mobility on conventional substrates.
Precision Biosensing: Serves as a chemical sensor interface for immobilizing physiologically active cell organelles and proteins. Its long hydrophobic chain enables fine-scale lithography and chemical patterning essential for point-of-care diagnostic arrays.
Advanced Photovoltaics: Applied in dye-sensitized solar cells to improve electrochemical performance by controlling interface kinetics and reducing recombination.
Nanofiber Functionalization: Used to silanize electrospun nanofibers for the development of moisture-resistant, hydrophobic coatings in smart materials and environmental sensors.

pictograms

Corrosion
GHS05

signalword

Danger

hcodes

H314

Hazard Classifications

Eye Dam. 1 - Skin Corr. 1B

Storage Class

8A - Combustible corrosive hazardous materials

wgk

WGK 1

flash_point_f

404.6 °F - closed cup

flash_point_c

207 °C - closed cup

ppe

Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter

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Certificates of Analysis (COA)

Lot/Batch Number
0000535367
0000535370
0000535370
0000535367
0000513294

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Coating of wood by means of electrospun nanofibers based on PVA/SiO2 and its hydrophobization with octadecyltrichlorosilane (OTS).
Kumar A, et al.
Holzforschung, 71(3), 225-231 (2017)
Shao-Yu Chen et al.
Nano letters, 12(2), 964-969 (2012-01-10)
In this article, we present the transport and magnetotransport of high-quality graphene transistors on conventional SiO(2)/Si substrates by modification with organic molecule octadecyltrichlorosilane (OTS) self-assembled monolayers (SAMs). Graphene devices on OTS SAM-functionalized substrates with high carrier mobility, low intrinsic doping
Siyang Yu et al.
Analytical and bioanalytical chemistry, 411(21), 5415-5422 (2019-07-19)
Isoelectric focusing (IEF), a powerful technique for protein separation and enrichment, was successfully integrated into microfluidic paper-based analytical devices (μPADs) in this work. The μPADs for isoelectric focusing were fabricated by octadecyltrichlorosilane (OTS) silanization and subsequent region-selective plasma treatment. The
Mark Ilton et al.
Nature communications, 9(1), 1172-1172 (2018-03-23)
Hydrodynamic slip, the motion of a liquid along a solid surface, represents a fundamental phenomenon in fluid dynamics that governs liquid transport at small scales. For polymeric liquids, de Gennes predicted that the Navier boundary condition together with polymer reptation
Wenlong Jin et al.
Nature communications, 9(1), 3586-3586 (2018-09-06)
Organic materials are emerging thermoelectric candidates for flexible power generation and solid-cooling applications. Although the Peltier effect is a fundamental thermoelectric effect that enables site-specific and on-demand cooling applications, the Peltier effect in organic thermoelectric films have not been investigated. Here we
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Global Trade Item Number

SKUGTIN
104817-100G04061838672117
104817-25G04061838672124
104817-500G04061838672131

Questions

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  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf

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  2. Bonjour, Serait-il possible de savoir si ce produit est proposé préalablement scellé avec un septum, compte tenu de sa grande sensibilité à l'air Merci,

    1 answer

    1. This product is packaged in glass bottles with screw caps that include an HDPE/PTFE liner rather than a septum. Currently, there is not product available with a septum closure.

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  3. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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