BSE diagnostic tests and human health protection
Semiconductor devices make good chemical sensors, being responsive, selective and compact. Some gas analytes, for example, can be photometrically detected by the electroluminescence they absorb from semiconductor light-emitting diodes2.3. Here we show that the intensity of this electroluminescence can be modulated in another way entirely, namely as a result of the adsorption of analytes onto the surface of the light-emitting diode, which affects its radiative efficiency by altering its surface- state structure and causes rapid, stable and reversible changes in electroluminescent intensity. Such devices are complementary to existing metal oxide-based resistance sensors, offering the advantages of low-power, room-temperature operation and ready integration into array-based devices.
Bibliographic Reference: An article published in: Nature (2001), vol.409, pp.476-478
Record Number: 200013602 / Last updated on: 2001-07-30
Original language: en
Available languages: en