Highly Photoluminescent Molybdenum Oxide Quantum Dots: One-Pot Synthesis and Application in 2,4,6-Trinitrotoluene Determination

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• 作者：Sai Jin Xiao ; Xiao Jing Zhao ; Ping Ping Hu ; Zhao Jun Chu ; Cheng Zhi Huang ; Li Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 30, 2016
• 年：2016
• 卷：8
• 期：12
• 页码：8184-8191
• 全文大小：531K
• ISSN：1944-8252

文摘

As a well-studied transition-metal semiconductor material, MoO_x 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 (MoO_x, 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 MoO_x quantum dots (MoO_x QDs), in which commercial molybdenum disulfide (MoS₂) powder and hydrogen peroxide (H₂O₂) are employed as the precursor and oxidant, respectively. The obtained MoO_x 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 MoO_x 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 MoO_x 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.