Abstract
Single-crystal 2D materials have attracted a boom of scientific and technological activities. Recently, chemical vapor deposition (CVD) shows great promise for the synthesis of high-quality 2D materials owing to high controllability, high scalability and ultra-low cost. Two types of strategies have been developed: one is single-seed method, which focuses on the ultimate control of the density of nucleation into only one nucleus and the other is a multi-seed approach, which concentrates on the precise engineering of orientation of nuclei into a uniform alignment. Currently, the latter is recognized as a more effective method to meet the demand of industrial production, whereas the oriented domains can seamlessly merge into a continuous single-crystal film in a short time. In this review, we present the detailed cases of growing the representative monocrystalline 2D materials via the single-seed CVD method as well as show its advantages and disadvantages in shaping 2D materials. Then, other typical 2D materials (including graphene, h-BN, and TMDs) are given in terms of the unique feature under the guideline of the multi-seed growth approach. Furthermore, the growth mechanism for the 2D single crystals is presented and the following application in electronics, optics and antioxidation coatings are also discussed. Finally, we outline the current challenges, and a bright development in the future of the continuous orientated growth of scaled 2D crystals should be envisioned.
Highlights
Ziyi Han received her Bachelor's degree at the College of Chemistry and Material Science, Hebei Normal University in 2021
Chemical vapor deposition (CVD) shows great promise for the synthesis of high-quality 2D materials owing to high controllability, high scalability and ultra-low cost
We present the detailed cases of growing the representative monocrystalline 2D materials via the single-seed chemical vapor deposition (CVD) method as well as show its advantages and disadvantages in shaping 2D materials
Summary
Ziyi Han received her Bachelor's degree at the College of Chemistry and Material Science, Hebei Normal University in 2021. In this case, the self-limiting mechanism may terminate the growth of large-area 2D materials and the process of covering the entire surface requires a relatively long time Another approach focuses on precisely controlling the orientations of the domains and ensuring that they stitch into homogeneous 2D materials without GBs (Fig. 2). Precisely keeping the balance between nucleation and growth With those unique features, great progress has been made in aligning the nuclei of the 2D materials into uniform orientation.[33,34,35] Currently, several techniques have been developed to realize the aim, most of which mainly focus on the processing of the catalyst surfaces.[36,37] It is well acknowledged that the substrate underneath is a critical factor to in uence the growth behaviors of the 2D materials because of the existence of the van der Waals interaction. With continuous efforts devoted, a bright future of the continuous orientated growth of scaled 2D crystals is expected
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