Herein, an ultrasensitive electrochemiluminescence (ECL) sensor was established for the determination of dopamine using sulfur quantum dots (SQDs) as the luminophore. The detection mechanism highlights how dopamine can be oxidized into dopamine quinone (DQ) and quenches the ECL signal of SQDs. Under the optimized experimental conditions, the ECL signal of SQDs was used for the detection of dopamine in the linear range of 1 × 10⁻¹⁰ to 1 × 10⁻³ M with a detection limit of 2.5 × 10⁻¹¹ M (S/N = 3). The proposed method has excellent specificity, a low detection limit, and high sensitivity when applied in the analysis of real samples and is applicable in the development of novel ECL luminophores as well as the improvement of human health.

在此，建立了一种超灵敏的电化学发光 (ECL) 传感器，用于使用硫量子点 (SQD) 作为发光体来测定多巴胺。检测机制突出了多巴胺如何被氧化成多巴胺醌 (DQ) 并淬灭 SQD 的 ECL 信号。在优化的实验条件下，SQDs的ECL信号用于检测线性范围为1×10 ^-10至1×10 ^-3 M的多巴胺，检测限为2.5×10 ^-11 M（S/N） = 3)。该方法在实际样品分析中具有优异的特异性、低检出限和高灵敏度，适用于新型ECL发光体的开发以及人类健康的改善。