Lin Yung-Mei, Wu Chieh-Ming, Lin Yi-Hsuan, Chang Jui-Hao, Liang Ling-Yi, Hsiao Vincent K S, Chu Chih-Chien
Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Nantou 545301, Taiwan.
Department of Medical Applied Chemistry, Chung Shan Medical University, Taichung 40201, Taiwan.
ACS Omega. 2024 Sep 4;9(37):38778-38787. doi: 10.1021/acsomega.4c04687. eCollection 2024 Sep 17.
The Au-MoS nanocomposites (NCPs) exhibit excellent visible-light photocatalytic activity and potential applications in the photocatalytic degradation of organic dyes. In this study, an Au-MoS heterojunction structure with Au nanoparticles (NPs) deposited on MoS nanosheets was synthesized via the pulsed laser-induced photolysis method. The influence of Au content on the photocatalytic performance was systematically investigated, and the working mechanism under visible light excitation was elucidated. The optimal Au-MoS NCPs exhibited efficient degradation of methylene blue (MB) dye, mainly attributed to the plasmon resonance effect of Au NPs which facilitated the visible light harvesting and hot electron injection. The Au/MoS interface promoted the separation and transfer of photogenerated charge carriers. The electrostatic adsorption between positively charged MB molecules and the negatively charged MoS surface favored the affinity toward active sites. Furthermore, the photogenerated electrons and holes participated in generating reactive oxygen species such as superoxide and hydroxyl radicals, which initiated the oxidative degradation of MB. The PLIP-introduced Au NPs not only endowed the material with excellent visible light responsivity but also possibly modulated the electronic structure and photocatalytic active sites of MoS through an intrinsic effect, providing new insights for further enhancing the photocatalytic performance of Au-MoS NCPs.
金-二硫化钼纳米复合材料（NCPs）在有机染料的光催化降解方面表现出优异的可见光光催化活性和潜在应用。在本研究中，通过脉冲激光诱导光解方法合成了一种金纳米颗粒（NPs）沉积在二硫化钼纳米片上的金-二硫化钼异质结结构。系统研究了金含量对光催化性能的影响，并阐明了可见光激发下的工作机制。最佳的金-二硫化钼NCPs对亚甲基蓝（MB）染料表现出高效降解，这主要归因于金纳米颗粒的等离子体共振效应，其促进了可见光捕获和热电子注入。金/二硫化钼界面促进了光生电荷载流子的分离和转移。带正电的MB分子与带负电的二硫化钼表面之间的静电吸附有利于对活性位点的亲和力。此外，光生电子和空穴参与生成超氧化物和羟基自由基等活性氧物种，从而引发MB的氧化降解。脉冲激光诱导光解引入的金纳米颗粒不仅赋予材料优异的可见光响应性，还可能通过内在效应调节二硫化钼的电子结构和光催化活性位点，为进一步提高金-二硫化钼NCPs的光催化性能提供了新的见解。
