Department of BIN Convergence Technology, Chonbuk National University, Jeonju, 561-756, South Korea.
Department of Organic Materials and Fiber Engineering, Chonbuk National University, Jeonju 561-756, South Korea.
Analyst. 2017 Mar 27;142(7):1149-1156. doi: 10.1039/c6an02601j.
As one of the most promising fluorometric nanosensors for metal ion sensing, carbon nanodots (C-dots) have developed rapidly in recent years. However, it is still a thorny problem to shield the mutual interference of two metal ions towards C-dots, e.g., Hg and Fe ions. In the present work, we propose rational routes for the unique interaction between C-dots and Hg or Fe. The selectivity of the as-obtained label-free C-dots can be effectively switched by PO and SCN. The resultant C-dots possess superior photoluminescence intensity stability in a wide pH range or in certain redox circumstances, which are highly preferred in terms of practical metal-ion detection. Moreover, the quenching-recovery-regeneration performances and quenching mechanisms were also investigated. Based on this stable and recoverable sensing platform, this in-depth study for dispelling interference from Hg and Fe ions may open up a new paradigm for developing potential detection of multi-metal ions using C-dots with switchable selectivity.
作为用于金属离子传感的最有前途的荧光纳米传感器之一，碳点（C-dots）近年来发展迅速。然而，屏蔽两个金属离子（例如 Hg 和 Fe 离子）对 C-dots 的相互干扰仍然是一个棘手的问题。在本工作中，我们提出了 C-dots 与 Hg 或 Fe 之间独特相互作用的合理途径。通过 PO 和 SCN，可以有效地切换所得无标记 C-dots 的选择性。所得 C-dots 在很宽的 pH 范围或某些氧化还原条件下具有优异的光致发光强度稳定性，这在实际金属离子检测方面是非常理想的。此外，还研究了猝灭-恢复-再生性能和猝灭机制。基于这个稳定且可恢复的传感平台，对 Hg 和 Fe 离子干扰的深入研究可能为开发使用具有可切换选择性的 C-dots 进行多金属离子潜在检测开辟新的范例。
