Nanotechnology is the understanding and control of matter at the nanoscale—roughly 1 to 100 nanometres—where size-dependent properties differ from the bulk. At these scales, surface area, quantum effects, and confinement can alter optical, electronic, magnetic, and mechanical behaviour. Techniques include top-down fabrication (lithography, etching) and bottom-up assembly (self-assembly, chemical synthesis). Applications span nanomaterials (e.g. carbon nanotubes, quantum dots), nanoelectronics and nanophotonics, nanomedicine (targeted drug delivery, imaging, theranostics), coatings and composites, and energy storage and conversion. Research and commercialisation are active in academia, national labs, and industry.
The technology promises materials and devices with tailored properties: stronger and lighter structures, more efficient catalysts and batteries, and medical interventions that operate at cellular or molecular scale. In electronics, nanoscale features have driven continued miniaturisation; in medicine, nanoparticles can improve delivery and reduce side effects. Environmental applications include filtration and remediation. Benefits must be weighed against possible risks: the same reactivity and mobility that make nanomaterials useful can raise concerns about toxicity, persistence, and occupational exposure.
Regulatory and standardisation frameworks for nanomaterials are still evolving. Scalable, reproducible manufacturing at acceptable cost remains a challenge for many applications. As characterisation and design tools improve, nanotechnology will continue to contribute across sectors, often as an enabling layer within larger systems rather than as a standalone product category.