Two kinds of carbon quantum dots (CQDs), having luminous peaks at 480 and 525 nm, were obtained by a single-step hydrothermal method. The detection of Hg2+ by two kinds of carbon dots was further explored. In order to compensate for the weak luminescence of blue carbon dots (480 nm) and low sensitivity of green carbon dots (525 nm), mixed carbon dots were examined for Hg2+ detection. The mixed carbon dots showed a better detection of Hg2+ ions. Low detection limit of 0.05 μM was found to be in the range of 0-1.0 μM of Hg2+. Moreover, in this range, the change of fluorescence intensity can be clearly seen under the ultraviolet lamp, which will be conducive for the practical application of detecting mercury ions with carbon dots.

中文翻译：

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用于宏观检测Hg2的多色碳量子点的一步合成。

通过一步水热法获得了在480和525 nm处具有发光峰的两种碳量子点（CQD）。进一步探索了通过两种碳点检测Hg2 +的方法。为了补偿蓝色碳点的弱发光（480 nm）和绿色碳点的低灵敏度（525 nm），检查了混合碳点的Hg2 +检测。混合的碳点显示出更好的Hg2 +离子检测。Hg2 +的低检出限为0.05μM。此外，在此范围内，在紫外线灯下可以清楚地看到荧光强度的变化，这将有利于实际检测带有碳点的汞离子。