Abstract

Development of economical, sensitive, selective and robust sensors for metal ion sensing is always fascinating for a chemist because traditional routs for their detection involve complicated instrumentation and critical sample preparation procedures. A large number of metal ion detectors including carbon dots (CDs) have been reported for sensitive and selective detection of metal ions. This review comprehensively explores the use of CDs as metallic cation sensors. CDs are being fabricated from variety of carbon sources by employing various synthetic channels. CDs are proved to be efficient colorimetric and fluorimetric detectors due to surface oxygen moieties which are responsible to co-ordinate with metal ions. Doping of CDs with hetero atom such as N, S, B etc. may further enhance their activity toward metal detection. Therefore, designing of CDs having selective sensing properties with low detection limits has gained significant interest.

• Highlights

• CDs have gained much attention as chemical sensors due to their dynamic features i.e. less toxicity, stability, solubility in various solvents, absorption in UV/Vis. region, fluorescence and tunable physico-chemical properties.

• These are coast effective, sensitive and selective colorimetric and fluorimetric metal ion sensors.

• Detection of metal ions by CDs involves different mechanisms such as complexation, aggregation, electron transfer, inner filter effect etc.

• LOD data is an evidence of their greater efficiency.

摘要

开发用于金属离子传感的经济、灵敏、选择性和稳健的传感器对于化学家来说总是很有吸引力，因为传统的检测方法涉及复杂的仪器和关键的样品制备程序。据报道，包括碳点 (CD) 在内的大量金属离子检测器可用于灵敏和选择性地检测金属离子。本综述全面探讨了 CD 作为金属阳离子传感器的用途。CD 是通过采用各种合成通道由各种碳源制造的。由于负责与金属离子配位的表面氧部分，CD 被证明是有效的比色和荧光检测器。用 N、S、B 等杂原子掺杂 CD 可以进一步增强它们对金属检测的活性。所以，

• 强调

• CD 因其动态特性（即毒性低、稳定性、在各种溶剂中的溶解性、在 UV/Vis 中的吸收）而作为化学传感器而备受关注。区域、荧光和可调的物理化学性质。

• 这些是海岸有效、灵敏和选择性的比色和荧光金属离子传感器。

• CDs对金属离子的检测涉及不同的机制，如络合、聚集、电子转移、内滤效应等。

• LOD 数据证明了它们的更高效率。