TY - JOUR

T1 - Structure of a diamond deposited from microwave plasma by a new gas-jet method

AU - Yelisseyev, A. P.

AU - Emelyanov, A. A.

AU - Rebrov, A. K.

AU - Timoshenko, N. I.

AU - Yudin, I. B.

AU - Gromilov, S. A.

AU - Titov, A. T.

AU - Plotnikov, M. Yu

N1 - Publisher Copyright: © 2020 Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2021/1

Y1 - 2021/1

N2 - Diamond coatings on a molybdenum substrate were obtained by gas-phase deposition from a high-speed jet of activated gases. In the most common case, diamond film is formed as a result of the appearance of discrete nuclei on the substrate, their growing and competing. We observed the formation of coatings consisting of separate isometric aggregates with different types of packaging (111) or (100) plates depending on the process parameters (gas flow, the H2/CH4 ratio, the substrate temperature). The study of coating morphology using optical and electron scanning microscopy suggests that the particles were in the gas phase for a long time and increased to the size of tens of microns, and then deposited on the substrate. This process can be explained by the charged state of the particles, according to the charged cluster model of Hwang (1996). The study of the structure and phase composition by XRD and Raman spectroscopy revealed amorphous carbon, disordered and crystalline graphite, molybdenum carbide with the dominant contribution of diamond). The broadband luminescence of the coating under UV excitation is related to amorphous carbon, whereas 532 nm excitation causes the glow of vacancy centers such as (NV−) and (SiV−).

AB - Diamond coatings on a molybdenum substrate were obtained by gas-phase deposition from a high-speed jet of activated gases. In the most common case, diamond film is formed as a result of the appearance of discrete nuclei on the substrate, their growing and competing. We observed the formation of coatings consisting of separate isometric aggregates with different types of packaging (111) or (100) plates depending on the process parameters (gas flow, the H2/CH4 ratio, the substrate temperature). The study of coating morphology using optical and electron scanning microscopy suggests that the particles were in the gas phase for a long time and increased to the size of tens of microns, and then deposited on the substrate. This process can be explained by the charged state of the particles, according to the charged cluster model of Hwang (1996). The study of the structure and phase composition by XRD and Raman spectroscopy revealed amorphous carbon, disordered and crystalline graphite, molybdenum carbide with the dominant contribution of diamond). The broadband luminescence of the coating under UV excitation is related to amorphous carbon, whereas 532 nm excitation causes the glow of vacancy centers such as (NV−) and (SiV−).

KW - Coating

KW - CVD diamond

KW - Defects

KW - Luminescence

KW - Raman

KW - Structure

KW - IMPACT DIAMONDS

KW - CARBON

KW - PHOTOLUMINESCENCE

KW - CHEMICAL-VAPOR-DEPOSITION

KW - RAMAN-SPECTROSCOPY

KW - OPTICAL-PROPERTIES

KW - CVD

KW - FILMS

KW - SUBSTRATE

KW - GROWTH

UR - http://www.scopus.com/inward/record.url?scp=85092517644&partnerID=8YFLogxK

U2 - 10.1016/j.ijrmhm.2020.105386

DO - 10.1016/j.ijrmhm.2020.105386

M3 - Article

AN - SCOPUS:85092517644

VL - 94

JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

SN - 0958-0611

M1 - 105386

ER -