College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, PR China.
College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Mar 5;210:341-347. doi: 10.1016/j.saa.2018.11.044. Epub 2018 Nov 16.
An effective and facile "on-off" fluorescence sensing approach for the determination of Fe ion using a large area and relatively uniform size graphitic carbon nitride nanosheets (GCNS) was developed. The prepared GCNS have blue and stable emission, as well as excellent water dispersion, and were applied as an effective fluorescent probe that based on the quenched fluorescence for selective and sensitive detection of Fe ion. Herein, we explain the ambiguous fluorescence quenching mechanism between the GCNS and Fe, which mainly springs from the redox potential and empty d orbital of Fe. The redox potential and unfilled d orbit of Fe endow it excellent binding force with GCNS, which generates most obvious fluorescence quenching effect with respect to other metal ions. The limit of detection (LOD) for Fe was found to be about 2.06 μM. Therefore, the prepared GCNS has the potential to be used as a fluorescent probe for detection.
采用大面积且相对均匀尺寸的石墨相氮化碳纳米片（GCNS），开发出一种用于测定 Fe 离子的有效且简便的“开-关”荧光传感方法。所制备的 GCNS 具有蓝色且稳定的发射，以及优异的水分散性，并被用作有效的荧光探针，基于荧光猝灭实现对 Fe 离子的选择性和灵敏检测。在此，我们解释了 GCNS 与 Fe 之间的荧光猝灭机制，该机制主要源于 Fe 的氧化还原电位和空 d 轨道。Fe 的氧化还原电位和空 d 轨道赋予其与 GCNS 极好的结合力，从而对其他金属离子产生最明显的荧光猝灭效果。Fe 的检测限（LOD）约为 2.06 μM。因此，所制备的 GCNS 有望用作荧光探针进行检测。
