Structural Modification in Au-MoS2 Quantum Dot Composites for Improved Catalytic Efficiency in p-Nitrophenol Reduction,ACS Applied Nano Materials

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Structural Modification in Au-MoS2 Quantum Dot Composites for Improved Catalytic Efficiency in p-Nitrophenol Reduction
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-04-21 , DOI: 10.1021/acsanm.3c00475
Nur Jalal Mondal _{1,

2} , Rahul Sonkar _{1,

2} , Samir Thakur ₃ , Nirab Ch. Adhikary ₄ , Devasish Chowdhury _{1,

2}

Affiliation

Au-MoS₂ quantum dots (QDs) composites are ideal catalysts for a number of reactions, including the reduction of p-nitrophenol (PNP). However, the structural role of Au-MoS₂ QDs composites in their catalytic efficiency has never been investigated. In this work, a comparative study is carried out to investigate the catalytic reactivities of a gold nanorod–molybdenum disulfide quantum dots (AuNR-MoS₂ QDs) composite and a gold nanosphere–molybdenum disulfide quantum dots (AuNS-MoS₂ QDs) composite. In addition, the catalytic reactivities of a gold nanorod (AuNR) and a gold nanosphere (AuNS) are also studied. The catalytic efficiency of the as-prepared composites is then investigated for the reduction of p-nitrophenol, taken as the model reaction. The kinetics of the catalytic reduction of p-nitrophenol reveal that the AuNR-MoS₂ QDs composite demonstrates the highest catalytic efficiency, having a rate constant of 0.06 min^–1, compared to the AuNS-MoS₂ QDs composite, AuNR, and AuNS, having a rate constant of 0.023, 0.021, and 0.008 min^–1, respectively. The possible mechanism is also discussed in the paper. Finite difference time domain (FDTD) simulation was carried out to simulate the electric field intensity of the AuNR-MoS₂ QDs composite, AuNS-MoS₂ QDs composite, AuNR, and AuNS. It is observed that, in general, the electric field intensity increases for the AuNR-MoS₂ QDs and AuNS-MoS₂ QDs composites when compared with only AuNR and AuNS. Therefore, this study emphasizes understanding the structural role of AuNR-MoS₂ QDs and AuNS-MoS₂ QDs composites, which is paramount in evaluating the catalytic efficiencies as demonstrated in the reduction of aromatic nitro compounds.

中文翻译：

Au-MoS2 量子点复合材料的结构修饰以提高对硝基苯酚还原的催化效率

Au-MoS _{2量子点 (QD) 复合材料是许多反应的理想催化剂，包括对}硝基苯酚 (PNP)的还原。然而，从未研究过Au-MoS ₂ QDs 复合材料在其催化效率中的结构作用。在这项工作中，进行了一项比较研究，以研究金纳米棒-二硫化钼量子点 (AuNR-MoS ₂ QDs) 复合材料和金纳米球-二硫化钼量子点 (AuNS-MoS ₂ QDs) 复合材料的催化反应性。此外，还研究了金纳米棒 (AuNR) 和金纳米球 (AuNS) 的催化反应性。然后研究所制备的复合材料的催化效率以减少对硝基苯酚，作为模型反应。对硝基苯酚催化还原的动力学表明，与 AuNS-MoS ₂ QDs 复合材料、AuNR 和 AuNS相比，AuNR-MoS ₂ QDs复合材料具有最高的催化效率，速率常数为 0.06 min ^–1 ，速率常数分别为 0.023、0.021 和 0.008 min ^–1。本文还讨论了可能的机制。_{进行了时域有限差分（FDTD）模拟来模拟AuNR-MoS 2} QDs复合材料AuNS-MoS ₂的电场强度QD 复合材料、AuNR 和 AuNS。据观察，一般而言，与仅 AuNR 和 AuNS 相比， AuNR-MoS ₂ QD 和 AuNS-MoS ₂ QD 复合材料的电场强度增加。_{因此，本研究强调了解 AuNR-MoS 2} QDs 和 AuNS-MoS ₂ QDs 复合材料的结构作用，这对于评估催化效率至关重要，如在芳香族硝基化合物的还原中所证明的那样。

更新日期：2023-04-21

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