Abstract
<p indent="0mm">Optical sensors have attracted the attention of many scientists because of their excellent selectivity, sensitivity, stability and low-cost. Carbon dots (CDs) are synthesized by a large number of natural and artificial carbon source materials through a variety of methods, and they can be chemically tuned by doping to achieve the required sensing characteristics. Many visualization sensors based on CDs have been reported, which can be used to detect various ions and molecules with high selectivity and sensitivity, and provides a theoretical basis for the field rapid detection equipment. This article summarizes the sensing mechanism and application of some excellent carbon dots as visualization sensors, and discusses their application potential in the field of public safety analysis.
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