Substrate-orientation dependent epitaxial growth of highly ordered diamond nanosheet arrays by chemical vapor deposition

Abstract

Three-dimensional ordering of two-dimensional nanomaterials has long been a challenge. Simultaneously, diamond nanomaterials are difficult to synthesize due to the harsh synthesizing conditions required. Here, we report substrate-crystal-orientation dependent growth of diamond nanosheets (DNSs) by chemical vapor deposition, which generates different DNS arrays on different substrates. The DNSs are grown by the in-plane epitaxy of the diamond {111} planes. So the arrays are highly ordered and solely determined by the spatial orientation of the {111} planes in the diamond FCC structure. The DNSs grown on the {110}, {111}, {001}, and {113} oriented substrates show inclination angles ranging from 90 to 29.5°. The DNSs with larger inclination angles grow preferentially, forming parallelogram arrays with inclination angles of 90° on the {110} substrates and parallel-line arrays with inclination angles of 80° on the {113} substrates. The density, thickness, size, and morphology of the DNSs have been well controlled. The present understanding and materials are highly promising for many applications such as sensors, catalysis, photonics, thermal management, and electronics.

Vertically Aligned N-Doped Diamond/Graphite Hybrid Nanosheets Epitaxially Grown on B-Doped Diamond Films as Electrocatalysts for Oxygen Reduction Reaction in an Alkaline Medium

“…The structure and composition of the samples were characterized by the methods described in our previous reports. , A resistance measuring system (2182A, Keithley) was used to determine the electrical conductivity of the samples.…”

“…Chen et al have used Ni, Fe, or Au/Ge films as catalysts to prepare the diamond nanosheets by microwave plasma chemical vapor deposition (MPCVD). − Later, the same group also prepared the diamond nanosheets on nanocrystalline diamond substrates without using catalysts . In 2008, Raina et al prepared the vertical diamond nanosheets (ridge profile) by introducing N 2 during the growth process. , Recently, we revealed that the diamond nanosheets arise from epitaxial growth of {111} planes of diamond substrates, resulting in the formation of highly ordered nanosheets arrays . Generally, the diamond nanosheets are grown accompanied by the graphitic overlayers, forming a diamond/graphite core/shell hybrid structure.…”

“…Compared with the graphene-encapsulated diamond particles and other diamond-based materials mentioned above, the DGNSs possess prominent advantages such as free of agglomeration, abundant and fully exposed graphitic edges, and strong adhesion with the substrates. For the DGNSs, the surface graphitic layers with open edges favor formation of pyridinic N or pyrrolic N, ,,, which are favorable for the ORR electrocatalytic activity. , Therefore, we expect that the DGNSs may be a good electrocatalyst toward the ORR.…”

A Review CHEMICAL VAPOR DEPOSITION : PROCESS AND APPLICATION

“…Pengendapan uap polimer dan substrat Pengendapan uap polimer telah membuka pintu ke berbagai bahan yang akan sulit, dan dalam beberapa kasus dan tidak mungkin, untuk diproduksi dengan cara lain. Sebagai contoh, banyak polimer yang bermanfaat, seperti bahan penumpahan air untuk melindungi komponen industri atau implan biologis, dibuat dari prekursor yang tidak dapat larut, sehingga tidak dapat diproduksi menggunakan metode berbasis solusi konvensional (90)(91)(92)(93). Pekerjaan Gleason pada CVD berbasis polimer dimulai pada 1990-an, ketika dia melakukan eksperimen dengan Teflon, senyawa klorin dan fluor.…”

Ba8Au5.25Ge40.75(110): A Nano-Caged Surface Electronically Controlled by Barium and Gold Adatoms

“…In this paper, we report the structure of another low-index surface of the Ba 8 Au 5.25 Ge 40.75 clathrate. Surface orientations play an important role in a wide range of applications, such as crystal growth, , wet etching, self-assembly, , and catalysis. , Investigations of the surface structures as a function of the surface orientations are then required to better control and achieve the desired surface chemistry and functionality.…”