Abstract
Researchers at the University of Wisconsin-Madison have developed a new type of chemical sensor, based on light-emitting diodes (LEDs). Reporting in Nature (25 January) the team led by Thomas Kuech and Arthur Ellis describe how exposing the surface of an LED to different substances causes the intensity of emitted light to fluctuate, in direct proportion to the amount of chemical applied. The work is part of efforts to develop ‘lab-on-a-chip’ analyses, and potential applications of the sensors could be in detection of air- or water-borne pollutants, or even biological molecules in a warzone. M.J.D.
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