The photosensitivity of carbon quantum dots/CuAlO sub(2) films composites

Carbon quantum dots/CuAlO sub(2) films were prepared by a simple route through which CuAlO sub(2) films prepared by sol-gel on crystal quartz substrates were composited with carbon quantum dots on their surface. The characterization results indicated that CuAlO sub(2) films were well combined with carbon quantum dots. The photoconductivity of carbon quantum dots/CuAlO sub(2) films was investigated under illumination and darkness switching, and was demonstrated to be significantly enhanced compared with CuAlO sub(2) films. Through analysis, this enhancement of photoconductivity was attributed to the carbon quantum dots with unique up-converted photoluminescence behavior.