title: Highly Photoluminescent Molybdenum Oxide Quantum Dots: One-Pot Synthesis and Application in 2,4,6-Trinitrotoluene Determination.
abstract: As a well-studied transition-metal semiconductor material, MoOx has a wider band gap than molybdenum disulfide (MoS2), and its property varies dramatically for the existence of several different allotropes and suboxide phases of molybdenum oxides (MoOx, x < 3). In this manuscript, a one-pot method possessing the advantages of one pot, easily prepared, rapid, and environmentally friendly, has been developed for facile synthesis of highly photoluminescent MoOx quantum dots (MoOx QDs), in which commercial molybdenum disulfide (MoS2) powder and hydrogen peroxide (H2O2) are employed as the precursor and oxidant, respectively. The obtained MoOx QDs can be further utilized as an efficient photoluminescent probe, and a new turn-off sensor is developed for 2,4,6-trinitrotoluene (TNT) determination based on the fact that the photoluminescence of MoOx QDs can be quenched by the Meisenheimer complexes formed in the strong alkali solution through the inner filter effect (IFE). Under the optimal conditions, the decreased photoluminescence of MoOx QDs shows a good linear relationship to the concentration of TNT ranging from 0.5 to 240.0 μM, and the limit of detection was 0.12 μM (3σ/k). With the present turn-off sensor, TNT in river water samples can be rapidly and selectively detected without tedious sample pretreatment processes.
authors.forename: Sai Jin
authors.initials: SJ
authors.lastname: Xiao
authors.forename: Xiao Jing
authors.initials: XJ
authors.lastname: Zhao
authors.affiliation: Innovative Drug Research Centre, Chongqing University , Chongqing 401331, China.
authors.forename: Ping Ping
authors.initials: PP
authors.lastname: Hu
authors.forename: Zhao Jun
authors.initials: ZJ
authors.lastname: Chu
authors.affiliation: College of Pharmaceutical Sciences, Southwest University , Chongqing 400715, China.
authors.forename: Cheng Zhi
authors.initials: CZ
authors.lastname: Huang
authors.affiliation: College of Chemistry, Nanchang University , Nanchang 330031, China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
keywords: 2,4,6-trinitrotoluene; Meisenheimer complexes; MoOx quantum dots; inner filter effect; photoluminescent sensor; turn-off