1-Naphthyltrimethoxysilane is an organosilicon compound featuring a naphthalene group linked to a trimethoxysilyl moiety. It is a clear to pale yellow liquid with the molecular formula C13H16O3Si. This compound is primarily used as a silane coupling agent and surface modifier. Its main application lies in modifying the surface properties of inorganic materials like glass, silica, and metals. The alkoxy groups (-OCH3) can hydrolyze and condense to form covalent bonds with surface hydroxyl groups, while the bulky, hydrophobic naphthyl group imparts specific surface characteristics, such as enhanced hydrophobicity, improved adhesion, and compatibility with organic polymers. It is also employed as a functional monomer in the synthesis of hybrid organic-inorganic materials and specialty polymers. As a reactive silane, it should be handled under inert atmosphere (e.g., nitrogen or argon) to prevent premature hydrolysis by atmospheric moisture. It is commonly used in coatings, adhesives, sealants, and composite materials to improve interfacial bonding and material performance.