Technological progress is often driven by materials science. High-tech devices require “smart” materials that combine a range of properties. An impressive current example is carbon nanotubes (CNTs)—single sheets of carbon atoms rolled into a cylinder. These ultrathin tubes have enormous mechanical strength and electrical conductivity. They also emit infrared fluorescent light, rendering them detectable. This makes them exciting materials for future bio-imaging technology, but the mechanism has proven surprisingly elusive.

Via:: https://phys.org/news/2017-11-electronic-fluorescence-carbon-nanotubes.html

The electronic origins of fluorescence in carbon nanotubes

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