11-Mercaptoundecanoic acid is widely used in the formation of self-assembled monolayers (SAMs) on gold and other metal surfaces. These SAMs are crucial in surface modification for applications such as biosensors, where they provide a stable and functional interface for immobilizing biomolecules like proteins or DNA. The compound is also employed in nanotechnology for creating nanostructured materials with tailored surface properties. Additionally, it serves as a linker molecule in the development of drug delivery systems, enabling the attachment of therapeutic agents to nanoparticles or other carriers. Its ability to form strong bonds with metals makes it valuable in corrosion inhibition and protective coating applications.