nanofabrication

Nanofabrication is the process of creating structures at the nanoscale, typically less than 100 nanometers. It involves two main strategies: a "top-down" approach, which miniaturizes existing technologies like lithography to create smaller features, and a "bottom-up" approach, which builds structures atom by atom using chemical or physical forces, inspired by biological self-assembly.12

The top-down method uses techniques like optical lithography, electron-beam lithography, and mechanical imprinting to pattern surfaces. While effective for creating ordered structures and macroscopic connections, it becomes increasingly difficult to apply at nanoscale dimensions and struggles with creating arbitrary three-dimensional objects.1

The bottom-up approach, or self-assembly, utilizes forces at the nanoscale to assemble basic units into larger structures. This method is crucial for creating nanoparticles and intricate structures like quantum dots and carbon nanotubes. Researchers are also exploring DNA-assisted assembly to integrate different components into single devices. Nanofabrication is a cornerstone of nanotechnology, enabling the creation of materials and systems with unique capabilities by precisely manipulating matter at the atomic and near-atomic scales.23