Growth of Diamond Nanoplatelets by CVD

Abstract

Hexagonal, single-crystalline, diamond nanoplatelets synthesized by microwave plasma (MP)CVD on Au-Ge alloy and nanocrystalline diamond (nc-diamond) film substrates, respectively, are reported. On the nc-diamond matrix, hexagonal diamond nanoplatelets can grow to a thickness of as little as approximately 10 nm. The effects of various processing parameters, such as methane concentration, microwave power, and gas pressure, on the growth of diamond nanoplatelets are explored. High-resolution transmission electron microscopy (HRTEM) reveals that the diamond nanoplatelets contain multi-parallel twins, and the side faces of the platelets exhibit {100}/{111} ridge-and-trough structure. Anisotropic growth of diamond nanoplatelet is believed to result from the side face structure of the twinned platelets and intensive plasma reaction.

Titanium catalyzed silicon nanowires and nanoplatelets

“…2(b), further suggest a distinct phenomenon from VSS nanowires. While apparently a new phenomenon for silicon at these length scales, Chen, et al, 23 grew noticeably similar diamond nanoplatelets on either nanocrystalline diamond or Au:Ge alloy coated substrates by plasma enhanced CVD.…”

“…22 At smaller scales, diamond nanoplatelets having 10-nm-scale thicknesses and 100-nm-scale extents have been reported, apparently also catalyzed by twin planes. 23 Here we report results from a 71-growth survey of titanium-catalyzed silicon nanowire growth conditions with atmosperic-pressure chemical vapor deposition (CVD). Many of the growths took place under conditions where the balance easily tipped between substrate etching, nanowire growth, platelet growth, and uncatalyzed silicon deposition.…”

Twin-plane reentrant edge growth of rhombohedra boron suboxide platelets

“…However, the underlying growth mechanism has not received so much attention as those focused on nanotubes, nanowires and nanoparticles. The most systematic growth mechanism studies of platelets have been carried out on face centered cubic (FCC) based materials, such as silicon [8][9][10][11] and germanium dendrites [12,13], nanocrystalline diamonds [14], silver platelets [15] and silver halide tabular platelets [16][17][18][19]. Anisotropic growth of the platelets can be unambiguously attributed to the preferential nucleation at the reentrant grooves of lateral twin planes, that is, the twin-plane reentrant edge (TPRE) mechanism, or the W-H-S growth mechanism [13,20].…”

Diamond plates on dome-like particles: preparation, characterization and field emission properties

“…Chen & Chang (2009) proposed that the twin lamellae are parallel to the platelets and the main tabular planes of the diamond nanoplatelets are the {111} planes. The growth of diamond nanoplatets through the {100}/{111} side faces adjacent to the twinned planes provides preferential sites for the nucleation of new layers (Chen et al, 2008;Lu & Chang, 2004. Thus, we believe that, if we carry out further analysis at atomic resolution, we may find that the diamond plates are also formed as a result of the presence of multiple twinned crystalline particles along with other structural defects (Yacoot et al, 1998;.…”

“…There have also been some reports of the fabrication of diamond crystals with octahedral, decahedral and cuboctahedral morphologies, which are highly faceted with sharp corners and edges, and of multiply twinned diamond crystals. Several authors have attempted to fabricate diamond nanopillars or nanowhiskers, either by plasma etching or by growth on anodic aluminium oxide templates (Chen et al, 2008). Lu & Chang (2004 reported regular {110} and {111} hexagonal diamond nanoplatelets, and recently Chen & Chang (2009) also noticed that nanocrystalline vertical diamond in a platelet configuration has a hexagonal shape.…”