Top-down synthesis involves breaking down larger materials into nanoscale particles. This method is often used in industries due to its scalability and simplicity. Some common techniques under this category include:
1. Mechanical Milling: This involves using mechanical force to grind bulk materials into nanoparticles. It's widely used but can result in broad size distributions. 2. Lithography: A process used in the semiconductor industry to etch nanoscale patterns onto materials. 3. Laser Ablation: A technique where a high-powered laser is used to vaporize material, forming nanoparticles.
