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A visible light-enhanced gas sensor based on cadmium selenide (CdSe) nanoribbons has been successfully developed. These nanoribbons were synthesized by a gold-catalyzed vapor-liquid-solid method and employed as visible-light-activated gas sensors for 50 to 1000 ppm ethanol at 200 °C. Visible light illumination on the surface of CdSe nanoribbons could produce more holes and increase the conductance of the sensor which significantly enhanced the gas response.

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