Journal
2D MATERIALS
Volume 4, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aa5b01
Keywords
powder vapor transport; transition metal dichalcogenide; numerical simulations; growth mechanism
Categories
Funding
- NSF under EFRI 2-DARE [1433378]
- Center for 2D and Layered Materials (2DLM) at the Pennsylvania State University
- NSF [DMR1539916]
- Hamer Professorship at Penn State, Louisiana Tech University [2DCC-MIP R0001]
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1433378] Funding Source: National Science Foundation
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Among post-graphene two dimensional (2D) materials, transition metal dichalcogenides (TMDs, such as MoS2) have attracted significant attention due to their superior properties for potential electronic, optoelectronic and energy applications. Scalable and controllable powder vapor transport (PVT) methods have been developed to synthesize 2D MoS2 with controllable morphologies (i.e. horizontal and vertical), yet the growth mechanism for the transition from horizontal to vertical orientation is not clearly understood. Here, we combined experimental and numerical modeling studies to investigate the key growth parameters that govern the morphology of 2D materials. The transition from vertical to horizontal growth is achieved by controlling the magnitude and distribution of the precursor concentration by placing the substrate at different orientations and locations relative to the source. We have also shown that the density of as-grown nanostructures can be controlled by the local precursor-containing gas flow rate. This study demonstrates the possibility for engineering the morphology of 2D materials by controlling the concentration of precursors and flow profiles, and provides a new path for controllable growth of 2D TMDs for various applications.
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