In current work, novel functionalized carbon dots have been designed and synthesized by covalently linking dopamine to the surface of S,N co-doped carbon dots (DA-S,N-CDs) for the selective detection of Fe³⁺ and Fe²⁺ in water. The as-synthesized DA-S,N-CDs emit blue fluorescence peaked at 470 nm and exhibit excitation-dependent tunable emissions. The tolerance towards pH, salt, and UV irradiation of synthesized carbon dots reveals excellent stability. Upon exposure to Fe³⁺ or Fe²⁺, the fluorescence of DA-S,N-CDs was selectively quenched, while other competitive cations did not change significantly. Under the optimal experimental conditions, the fluorescence intensity of DA-S,N-CDs showed a good linear relationship with the concentrations of Fe³⁺ and Fe²⁺ (5 – 200 μM for Fe³⁺ and 5 – 300 μM for Fe²⁺), and the limit of detection was 2.86 and 2.06 μM, respectively. Furthermore, considering the excellent stability and anti-interference, DA-S,N-CDs have been successfully used for the detection of Fe³⁺ and Fe²⁺ in environmental water.

在目前的工作中，通过将多巴胺共价连接到 S,N 共掺杂碳点 (DA-S,N-CDs) 的表面，设计并合成了新型功能化碳点，用于选择性检测 Fe ³⁺和 Fe ²⁺在水里。合成后的 DA-S、N-CD 发出蓝色荧光，峰值为 470 nm，并表现出依赖于激发的可调发射。合成碳点对 pH、盐和紫外线照射的耐受性显示出优异的稳定性。接触 Fe ³⁺或 Fe ^{2+ 时}, DA-S,N-CDs 的荧光被选择性淬灭，而其他竞争性阳离子没有显着变化。在最佳实验条件下，DA-S的荧光强度，N-CDS表明线性与Fe的浓度关系的良好³⁺和Fe ²⁺（5 - 200μM为铁³⁺和5 - 300μM为铁^{2 +} )，检测限分别为 2.86 和 2.06 μM。此外，考虑到优异的稳定性和抗干扰性，DA-S,N-CDs已成功用于检测环境水中的Fe ³⁺和Fe ²⁺。