Gold nanoparticles are widely used in medical diagnostics due to their unique optical properties. They are employed in biosensors for detecting diseases at an early stage, offering high sensitivity and specificity. In cancer treatment, these nanoparticles are utilized for targeted drug delivery, enabling precise therapy with minimal side effects. Additionally, they play a crucial role in imaging techniques, enhancing the clarity of medical scans. In the field of electronics, gold nanoparticles are integral in the development of conductive inks and flexible displays. Their application in environmental science includes water purification, where they help in the removal of contaminants. Furthermore, they are used in catalysis to accelerate chemical reactions, improving efficiency in industrial processes.