期刊
ACS NANO
卷 16, 期 3, 页码 3735-3743出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c07349
关键词
van der Waals crystal; vapor-liquid-solid growth; quantum effciency; defect-mediated growth; cathodoluminescence
类别
资金
- National Science Foundation, Division of Materials Research, Solid State and Materials Chemistry Program [DMR-1904843]
Defects in two-dimensional and layered materials can lead to different properties compared to perfect crystals. In the nanostructures of van der Waals crystals, the catalyst plays a crucial role in controlling the morphologies and facilitating fast growth, which results in emerging functionality.
Defects in two-dimensional and layered materials have attracted interest for realizing properties different from those of perfect crystals. Even stronger links between defect formation, fast growth, and emerging functionality can be found in nanostructures of van der Waals crystals, but only a few prevalent morphologies and defect-controlled synthesis processes have been identified. Here, we show that in vapor-liquid-solid growth of 1D van der Waals nanostructures, the catalyst controls the selection of the predominant (fast-growing) morphologies. Growth of layered GeS over Bi catalysts leads to two coexisting nanostructure types: chiral nanowires carrying axial screw dislocations and bicrystal nanoribbons where a central twin plane facilitates rapid growth. While Au catalysts produce exclusively dislocated nanowires, their modification with an additive triggers a switch to twinned bicrystal ribbons. Nanoscale spectroscopy shows that, while supporting fast growth, the twin defects in the distinctive layered bicrystals are electronically benign and free of nonradiative recombination centers.
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