Du, Fuyou 1 ; Cheng, Zhenfang 2 ; Lai, Zhan 2 ; Ruan, Guihua 2 ; Zhao, Chenxi 3 1 Changsha University, Coll Biol & Environm Engn, Changsha 410022, Peoples R China, Guilin University of Technology, Coll Chem & Bioengn, Guangxi Key Lab Electrochem & Magnetochem Funct M, Guilin 541004, Peoples R China, Peoples R China email@example.com 2 Guilin University of Technology, Coll Chem & Bioengn, Guangxi Key Lab Electrochem & Magnetochem Funct M, Guilin 541004, Peoples R China, Peoples R China firstname.lastname@example.org 3 Changsha University, Coll Biol & Environm Engn, Changsha 410022, Peoples R China, Peoples R China email@example.com
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 fluorescence detection of the alachlor herbicide in soil samples. The synthesized N-CQDs exhibited strong red emission with a 27.6% quantum yield (QY) and high stability. Under the optimized experimental conditions, the as-prepared red-emissive N-CQDs were employed as a fluorescent probe to successfully detect trace alachlor, and their fluorescence presented a good linear decline with the increase of the alachlor concentration from 0.005 to 150 mu M with a limit of detection of 0.2 nM. The N-CQDs as a fluorescent probe were used for the detection of alachlor in soil samples with satisfactory recoveries ranging from 86.6-114.3%, indicating that they were a promising fluorescent probe for highly selective and sensitive determination of alachlor.