4.7 Article

Pt147 Nanoclusters Soft-Landed on WS2 Nanosheets for Catalysis and Energy Harvesting

Journal

ACS APPLIED NANO MATERIALS
Volume 4, Issue 12, Pages 13140-13148

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c02683

Keywords

2D materials; WS2 atomic layers; physical vapor transport; mass-selected Pt nanoclusters; gas-phase cluster-beam deposition; high-angle annular dark field (HAADF)-scanning transmission electron microscopy (STEM); stacking sequence

Funding

  1. HORIZON 2020, H2020 Marie-Sklodowska-Curie Actions [H2020-MSCA-IF-2017, 750929]
  2. Swansea University
  3. Technological University Dublin
  4. National Research Foundation of Korea (NRF) - Korean government (MSIT, Ministry of Science and ICT) [NRF-2020R1A2C2009378]
  5. Marie Curie Actions (MSCA) [750929] Funding Source: Marie Curie Actions (MSCA)

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This study synthesized hybrid materials composed of platinum nanoclusters and tungsten disulfide 2D atomic layers, revealing the interaction between nanoclusters and the 2D material using high-resolution scanning transmission electron microscopy and micro-Raman spectroscopy. The findings provide a new route for the controlled incorporation of size-selected nanoclusters on the 2D tungsten disulfide basal plane, offering potential applications in catalysis and energy harvesting devices.
Understanding the interaction between metal nanoclusters and two-dimensional (2D) layered materials presents a route toward the creation and tuning of hybrid materials. Here, we synthesize hybrid materials composed of mass-selected platinum nanoclusters produced using a magnetron sputtering gas aggregation cluster beam source with a lateral time-of-flight mass filter (mass resolution M/Delta M = 20) and large-area tungsten disulfide (WS2) 2D atomic layers. We employ aberration-corrected scanning transmission electron microscopy (STEM) in high-angle annular dark-field (HAADF) mode and micro-Raman spectroscopy to study the interaction between Pt-147 and suspended WS2 atomic layers. HAADF-STEM analysis reveals that soft-landed Pt-147 nanoclusters are situated on top of few-layered WS2 stacks, rather than being embedded or pinned. We observed a red shift in both E-2g and A(1g) modes and striking enhancement of A(1g) mode in the micro-Raman signatures of WS2, which provide evidence that Pt-147 clusters are soft-landed on the WS2 basal plane without disrupting the crystalline structure of the WS2 and of charge transfer from Pt-147 to WS2, respectively. In contrast, the measured change in line width of the E-2g mode of WS2 reveals a strong interaction between Pt-147 and WS2 layers. Direct evidence for the relative stability of Pt-147 clusters on WS2 is assessed by position-dependent Raman profiling and real-time HAADF-STEM imaging. Our approach offers a novel route to the controlled incorporation of size-selected nanoclusters on the 2D WS2 basal plane for catalysis and energy harvesting device applications.

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