There are several methods to achieve precise size control in nanotechnology, including bottom-up and top-down approaches:
Bottom-up Approaches: These methods build nanostructures atom-by-atom or molecule-by-molecule. Techniques like chemical vapor deposition (CVD) and sol-gel processes fall into this category. Top-down Approaches: These techniques start with bulk material and etch away or otherwise reduce it to the nanoscale. Examples include lithography and mechanical milling.
