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Nanoparticle-Templated Thickness Controlled Growth, Thermal Stability, and Decomposition of Ultrathin Tin Sulfide Plates

Journal Article · · Chemistry of Materials
 [1];  [2];  [3]
  1. Univ. of Nebraska-Lincoln, Lincoln, NE (United States). Dept. of Mechanical and Materials Engineering; University of Nebraska-Lincoln
  2. Univ. of Nebraska-Lincoln, Lincoln, NE (United States). Dept. of Mechanical and Materials Engineering
  3. Univ. of Nebraska-Lincoln, Lincoln, NE (United States). Dept. of Electrical and Computer Engineering
Tin monosulfide (SnS) is a layered two-dimensional semiconductor attractive for instance for photovoltaics, optoelectronics, and valleytronics. However, these applications require synthesis of SnS flakes with controlled thickness and shape. Here we demonstrate the possibility of using Au nanoparticles to seed the nucleation, determine the position and control the thickness of the growing SnS plates. Further, we use in-situ transmission electron microscopy on individual ultrathin SnS flakes during annealing at high temperatures to establish their thermal stability and decomposition pathways, important due to the large surface areas of ultrathin flakes. We find that ultrathin SnS plates decompose rapidly at temperatures above 400 ºC. The decomposition invariably starts at the edges of the flakes and is highly anisotropic. Real-time observations show that while the {010} and the {110} facets are relatively stable and retract slowly, rapid removal of material along the < 100 > directions leads to the fast decay of {100} facets, which are thus replaced by extended {110} facets. The comparison of shapes developed during growth and sublimation establishes that the typical crystal habits observed for SnS and related group IV monochalcogenides are indeed kinetic growth shapes rather than equilibrium (Wulff) shapes determined by different facet surface free energies. Furthermore, these findings can further guide the design of growth experiments for achieving particular shapes of flakes of SnS and related layered crystals.
Research Organization:
Univ. of Nebraska-Lincoln, Lincoln, NE (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0016343
OSTI ID:
1573809
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 7 Vol. 31; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Wrap‐Around Core–Shell Heterostructures of Layered Crystals journal May 2019
Self-organized twist-heterostructures via aligned van der Waals epitaxy and solid-state transformations journal December 2019

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