State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China.
Anal Chem. 2013 Jun 4;85(11):5595-9. doi: 10.1021/ac400924j. Epub 2013 May 17.
A highly efficient fluorosensor based on ultrathin graphitic carbon nitride (g-C₃N₄) nanosheets for Cu(2+) was developed. In the absence of metal ions, the nanosheets exhibit high fluorescence; the strong coordination of the Lewis basic sites on them to metal ions, however, causes fluorescence quenching via photoinduced electron transfer leading to the qualitative and semiquantitative detection of metal ions. This fluorosensor exhibits high selectivity toward Cu(2+). The whole detection process can be completed within 10 min with a detection limit as low as 0.5 nM. The use of test paper enables the naked-eye detection of Cu(2+) with a detection limit of 0.1 nmol. The practical use of this sensor for Cu(2+) determination in real water samples was also demonstrated.
一种基于超薄石墨相氮化碳（g-C₃N₄）纳米片的高效荧光传感器被开发出来，用于检测 Cu(2+)。在没有金属离子的情况下，纳米片表现出很强的荧光；然而，由于路易斯碱性位点与金属离子的强配位作用，通过光诱导电子转移导致荧光猝灭，从而实现了金属离子的定性和半定量检测。该荧光传感器对 Cu(2+)具有很高的选择性。整个检测过程可在 10 分钟内完成，检测限低至 0.5 nM。通过使用试纸，实现了对 Cu(2+)的肉眼检测，检测限低至 0.1 nmol。还展示了该传感器在实际水样中 Cu(2+)测定中的实际应用。
