Abstract：
A ratiometric fluorescent and colorimetric detecting assay for NO2- was realized by a hybrid nanosensor (Co2+-CDs@R-CDs) utilizing firstly through the redox reaction of nitrite (NO2-) with Co2+, of which the hybrid nanosensor Co2+-CDs@R-CDs was fabricated by Co2+-doped carbon dots (Co2+-CDs) and a reference of red-emitting carbon dots (R-CDs). The ratiometric fluorescent linear detection range of NO2- was 2.5-45 μM and the limit of detection (LOD) was 0.068 μM with the response time of 120 s. While, the colorimetric linear detection range of NO2- was 2.5-60 μM and the LOD was 0.075 μM. In addition, a portable smartphone system which could measure the R (red), G (green), and B (blue) values of the fluorescence and the visible color of the coated Co2+-CDs@R-CDs paper strip-based sensor had also been developed and successfully applied to detect NO2- in sausage, pickles and tap water samples.
摘要：
首先利用亚硝酸盐（NO2-）与Co2的氧化还原反应，通过混合纳米传感器（Co2-CD@R-CD）实现了NO2-的比率荧光和比色检测测定法，其中混合纳米传感器Co2-CD@R-CD是由Co2掺杂的碳点（Co2-CD）和红色发射碳点（R-CD）制成的。NO2-的比率荧光线性检测范围为2.5-45μM，检测限（LOD）为0.068μM，响应时间为120s。NO2-的比色线性检测范围为2.5-60μM，LOD为0.075μM。此外,可以测量R（红色）的便携式智能手机系统，G（绿色），还开发了基于涂层Co2-CD@R-CD纸带的传感器的荧光B（蓝色）值和可见颜色，并成功地用于检测香肠中的NO2-。泡菜和自来水样品。
