Octadecylphosphonic Acid丨CAS 4724-47-4

Octadecylphosphonic acid is widely used as a surface modifier and self-assembled monolayer (SAM) forming agent on metal oxides such as aluminum, titanium, zinc, and indium tin oxide (ITO). It is applied in electronics and semiconductor industries to tailor surface energy, improve adhesion, and enhance dielectric or insulating properties. In coatings and corrosion protection, it forms dense, hydrophobic layers that protect metal surfaces from moisture and oxidation. The compound is also used in nanotechnology for functionalizing nanoparticles, quantum dots, and nanostructured materials to improve dispersion and stability. Additionally, it is employed in the development of organic–inorganic hybrid materials, biosensors, and thin films, as well as in research for studying surface interactions and molecular self-assembly.

The key benefits of octadecylphosphonic acid lie in its strong chemisorption to metal oxide surfaces through the phosphonic acid group, forming stable and durable bonds compared to other surface modifiers. The long alkyl chain provides excellent hydrophobicity, reducing surface energy and improving water resistance. It forms well-ordered, tightly packed monolayers that enhance surface uniformity and performance in coatings and electronic materials. The compound is chemically stable and effective at low concentrations, making it efficient and cost-effective for industrial applications. Its versatility allows it to be used across a wide range of materials and processes, from corrosion protection to advanced nanomaterial design.