Owing to the outstanding properties, fluorescent silicon quantum dots (SiQDs) have attracted immense attention in recent years. In this work, the facile synthesized, environment friendly green-emitting SiQDs (g-SiQDs) were prepared for the detection of nitrite (NO₂⁻). It has excellent merits including excellent water-dispersible, photo-stability and salt tolerance. The fluorescence peak at 503 nm could be selectively quenched by NO₂⁻ due to the synergy of inner filter effect (IFE) and photo induced electron transfer (PET). There was a linear relationship between fluorescence quenching efficiency and the concentration of NO₂⁻ from 0.1 to 6.0 μM (R² = 0.9969) with a limit of detection (LOD) of 25 nM, and the sensor displayed a significant selectivity toward NO₂⁻. Furthermore, the g-SiQDs were successfully applied to analysis NO₂⁻ in food samples after simple pretreatment with satisfactory recoveries, and our method has good potential for routine analyze of NO₂⁻ in food samples.

由于其优异的性能，荧光硅量子点（SiQD）近年来引起了极大的关注。在这项工作中，合成的容易，环境友好的绿色发光SiQDs（G-SiQDs）被用于检测亚硝酸盐的制备（NO ₂ ^- ）。它具有优异的优点，包括出色的水分散性，光稳定性和耐盐性。在503 nm处的荧光峰可以通过NO来选择性地淬灭₂ ^-由于内过滤器效果（IFE）和光诱导电子转移（PET）的协同作用。有荧光猝灭效率和NO的浓度之间的线性关系₂ ^- 0.1至6.0μM（R ² = 0.9969）与25nM的检测限（LOD的限制），并且传感器所显示的显著选择性朝向NO ₂ ^- 。此外，G-SiQDs成功地应用到分析NO ₂ ^-食物样本中简单的预处理满意收回的金额后，我们的方法有很好的潜力对NO的常规分析₂ ^-食品样品英寸