Concentration-Dependent Layer-Stacking and the Influence on Phase-Conversion in Colloidally Synthesized WSe2 Nanocrystals
Year: 2024
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide We report a synthesis of WSe 2 nanocrystals in which the number of layers is controlled by varying the precursor concentration. By altering the ratios and concentrations of W(CO) 6 and Ph 2 Se 2 in trioctylphosphine oxide, we show that high [Se] and large Se/W ratios lead to an increased number of layers per nanocrystal. As the number of layers per nanocrystal is increased, the nanocrystal ensembles show less phase-conversion from the metastable 2M phase to the thermodynamically favored 2H phase. Density functional theory calculations indicate that the interlayer binding energy increases with the number of layers, indicating that the stronger interlayer interactions in multilayered nanocrystals may increase the energy barrier to phase-conversion. The results presented herein provide insights for directing phase-conversion in solution-phase syntheses of transition metal dichalcogenides.
Source: Chemistry of Materials
Institution: University of California San Diego
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: Manipulation of Precursor Coordination and Reactivity to Enable Phase-tunability in Colloidally Synthesized Transition Metal Dichalcogenide Nanocrystals, G4574467239, NNCI: San Diego Nanotechnology Infrastructure (SDNI), UC San Diego MRSEC: an NSF Materials Research Science and Engineering Center
OpenAlex ID: W4402363184