Abstract
Chemical vapor deposition (CVD) is one of the most versatile techniques for the controlled synthesis of functional nanomaterials. When multiple precursors are induced, the CVD process often gives rise to the growth of doped or alloy compounds. In this work, we demonstrate the self-assembly of a variety of ‘phase-separated’ functional nanostructures from a single CVD in the presence of various precursors. In specific, with silicon substrate and powder of Mn and SnTe as precursors, we achieved self-organized nanostructures including Si/SiOx core-shell nanowire heterostructures both with and without embedded manganese silicide particles, Mn11Si19 nanowires, and SnTe nanoplates. The Si/SiOx core-shell nanowires embedded with manganese silicide particles were grown along the <111> direction of the crystalline Si via an Au-catalyzed vapor-liquid-solid process, in which the Si and Mn vapors were supplied from the heated silicon substrates and Mn powder, respectively. In contrast, direct vapor-solid deposition led to particle-free <110>-oriented Si/SiOx core-shell nanowires and <100>-oriented Mn11Si19 nanowires, a promising thermoelectric material. No Sn or Te impurities were detected in these nanostructures down to the experimental limit. Topological crystalline insulator SnTe nanoplates with dominant {100} and {111} facets were found to be free of Mn (and Si) impurities, although nanoparticles and nanowires containing Mn were found in the vicinity of the nanoplates. While multiple-channel transport was observed in the SnTe nanoplates, it may not be related to the topological surface states due to surface oxidation. Finally, we carried out thermodynamic analysis and density functional theory calculations to understand the ‘phase-separation’ phenomenon and further discuss general approaches to grow phase-pure samples when the precursors contain residual impurities.
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Acknowledgements
We thank Prof. X. F. Qian for helpful discussions, W. Yang and M. Hosek for experimental assistance. We are also grateful to Y. Zhao and Prof. D. Li for some preliminary thermal transport characterization efforts which prompted the authors to conduct more thorough analyses of the synthesized nanostructures. This work was supported, in part, by the Indiana University Vice Provost for Research through the Faculty Research Support Program, National Science Foundation Research Experience for Undergraduates grant PHY-1757646, NSF-DMR-1350002. We thank the Indiana University-Bloomington Nanoscale Characterization Facility (NCF) for the use of instruments (The XPS instrument at NCF was funded through grant NSF-DMR-1126394).
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Wang, J., Xie, D., Li, Z. et al. Self-organization of various “phase-separated” nanostructures in a single chemical vapor deposition. Nano Res. 13, 1723–1732 (2020). https://doi.org/10.1007/s12274-020-2798-5
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DOI: https://doi.org/10.1007/s12274-020-2798-5