Trichloro(octadecyl)silane

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.

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.