Abstract
Two kinds of carbon quantum dots (CQDs), having luminous peaks at 480 and 525nm, 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 (480nm) and low sensitivity of green carbon dots (525nm), mixed carbon dots were examined for Hg2+ detection. The mixed carbon dots showed a better detection of Hg2+ ions. Low detection limit of 0.05μM was found to be in the range of 0-1.0μM 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.
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