Gold compounds have a variety of functions and applications. Here are some of the main functions: Catalysts: Gold nanoparticles and gold compounds are often used as catalysts in chemical reactions, especially in organic synthesis and environmental chemistry. Electronic devices: Gold is widely used in electronic components such as circuit boards and connectors due to its excellent conductivity and corrosion resistance. Biomedicine: Gold nanoparticles are used in medical imaging, drug delivery and cancer treatment, which can target specific cells and reduce the impact on surrounding healthy cells. Sensors: Gold materials can be used to make highly sensitive sensors that can detect a variety of biomolecules and chemicals.