Sun Yifan, Wang Yuanxi, Chen Jamie Y C, Fujisawa Kazunori, Holder Cameron F, Miller Jeffery T, Crespi Vincent H, Terrones Mauricio, Schaak Raymond E
Department of Chemistry, The Pennsylvania State University, University Park, PA, USA.
Materials Research Institute, The Pennsylvania State University, University Park, PA, USA.
Nat Chem. 2020 Mar;12(3):284-293. doi: 10.1038/s41557-020-0418-3. Epub 2020 Feb 24.
Functionalizing the surfaces of transition metal dichalcogenide (TMD) nanosheets with noble metals is important for electrically contacting them to devices, as well as improving their catalytic and sensing capabilities. Solution-phase deposition provides a scalable approach to the creation of metal-TMD hybrid systems, but controlling such processes remains challenging. Here we elucidate the different pathways by which gold and silver deposit at room temperature onto colloidal 1T-WS, 2H-WS, 2H-MoSe, 2H-WSe, 1T'-MoTe and T-WTe few-layer nanostructures to produce several distinct classes of 0D-2D and 2D-2D metal-TMD hybrids. Uniform gold nanoparticles form on all of the TMDs. By contrast, silver deposits as nanoparticles with a bimodal size distribution on the disulfides and diselenides, and as atomically thin layers on the ditellurides. The various sizes and morphologies of these surface-bound metal species arise from the relative strengths of the interfacial metal-chalcogen bonds during the reduction of Au or Ag by the TMDs.
用贵金属对过渡金属二硫属化物（TMD）纳米片表面进行功能化处理，对于将它们与器件进行电接触以及提高其催化和传感能力而言至关重要。溶液相沉积为创建金属-TMD混合体系提供了一种可扩展的方法，但控制此类过程仍然具有挑战性。在此，我们阐明了金和银在室温下沉积到胶体状1T-WS、2H-WS、2H-MoSe、2H-WSe、1T'-MoTe和T-WTe少层纳米结构上的不同途径，以产生几类不同的0D-2D和2D-2D金属-TMD杂化物。在所有TMD上均形成了均匀的金纳米颗粒。相比之下，银在二硫化物和二硒化物上以具有双峰尺寸分布的纳米颗粒形式沉积，而在二碲化物上以原子级薄层形式沉积。这些表面结合的金属物种的各种尺寸和形态源于TMD在还原Au或Ag过程中界面金属-硫属元素键的相对强度。
