等离子体金纳米粒子掺杂MoS $_2$纳米片光催化降解有机染料的研究
Enhanced photocatalytic activity of plasmonic Au nanoparticles incorporated MoS$_2$ nanosheets for degradation of organic dyes
摘要：
在本文中，我们研究了等离子体金纳米粒子（NPs）的装饰对二硫化钼$_2$纳米片的光催化效率的影响。通过化学还原法在化学剥离的MoS $_2$纳米片表面生长Au纳米颗粒。利用X射线衍射仪、拉曼光谱仪、吸收分光光度计和透射电子显微镜对Au-MoS $_2$纳米结构进行了表征。采用剥离态MoS $_2$和Au-MoS $_2$纳米结构光催化剂对有机染料甲基红（MR）和亚甲基蓝（MB）进行光催化降解研究。在UV-可见光照射下，原始MoS $_2$分别显示出对于MR在30%至46.9%之间的光降解效率和对于MB在23.3%至44%之间的光降解效率，其中暴露时间从30分钟变化至120分钟。然而，具有最大Au NPs浓度的Au-MoS $_2$ NS显示对于MR从70.2%提高到96.7%，对于MB从65.2%提高到94.3%的降解效率。两种染料与Au-MoS $_2$ NS的降解效率的多方面增强可以归因于在NS中充当电荷捕获位点的Au NP的存在。我们相信这项研究将在对抗环境退化的不良影响方面具有潜在的应用价值，环境退化对人类和生物多样性构成了重大威胁。
英文摘要：
In the present paper, we investigate the effect of plasmonic Au nanoparticles (NPs) decoration on the photocatalytic efficiency of MoS$_2$ nanosheets. The Au NPs are grown on the surface of chemically exfoliated MoS$_2$ nanosheets by chemical reduction method. Au-MoS$_2$ nanostructures (NSs) are characterized by X-ray diffractometer, Raman spectrometer, absorption spectrophotometer, and transmission electron microscopy. Exfoliated MoS$_2$ and Au-MoS$_2$ NSs are used to study the photocatalytic degradation of organic dyes methyl red (MR) and methylene blue (MB). Under UV-Visible light irradiation, pristine MoS$_2$ shows photo degradation efficiencies between 30% to 46.9% for MR and 23.3% to 44% for MB, with varying exposure times from 30 to 120 min, respectively. However, Au-MoS$_2$ NSs with maximum Au NPs concentration show enhanced degradation efficiency from 70.2 to 96.7% for MR, and from 65.2 to 94.3% for MB. The manifold enhancement of degradation efficiency for both the dyes with Au-MoS$_2$ NSs may be attributed to the presence of Au NPs acting as charge trapping sites in the NSs. We believe this study would have potential application in battling the ill-effects of environmental degradation, which poses a major threat to humans as well as biodiversity.
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