Red-emissive nitrogen doped carbon quantum dots for highly selective and sensitive fluorescent detection of alachlor herbicide in soil samples
Red-emissive nitrogen doped carbon quantum dots (N-CQDs) were synthesized by a facile and efficient microwave-assisted hydrothermal treatment of p-phenylenediamine (p-PD), and then applied for the highly selective and sensitive fluorescent detection of alachlor herbicide in soil samples. The synthesized N-CQDs exhibited a strong red emission with 27.6% quantum yield (QY) and high stability. Under the optimized experimental conditions, the as-prepared red-emissive N-CQDs were employed as fluorescent probe to successfully detect trace alachlor, and its fluorescence presented a good linear decline with the increase of alachlor concentration from 0.005 to 150 μM with a limit of detection of 0.2 nM. The N-CQDs as fluorescence probe was used for the detection of alachlor in soil samples with satisfying recoveries ranging from 86.6-114.3%, indicating it was a promising fluorescent probe for highly selective and sensitive determination of alachlor.