PEIDONG YANG / UC BERKELEY / SCIENCE PHOTO LIBRARY PEIDONG YANG / UC BERKELEY / SCIENCE PHOTO LIBRARY
Gallium nitride nanotubes. Tranmission electron micrograph (TEM) of gallium nitride (GaN) nanotube crystals created by Peidong Yang and his team at the University of California, Berkeley, USA. These transparent, hollow tubes measure 30-200 nanometres (billionths of a metre) in width and up to 20 micrometres (thousandths of a metre) in length. GaN is a semiconductor material used in industry to produce circuits, blue LEDs, ultraviolet lasers and other optoelectronic devices. Unlike nanotubes made of carbon, GaN nanotubes can be attached with organic molecules, such as proteins, making it possible to create nanoscale chemical sensors and lab-on-a- chip devices. Photographed in 2003.
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