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Fast, Efficient Tailoring Growth of Nanocrystalline Diamond Films by Fine-Tuning of Gas-Phase Composition Using Microwave Plasma Chemical Vapor Deposition

化学气相沉积 材料科学 纳米晶材料 微波食品加热 钻石 纹理(宇宙学) 等离子体增强化学气相沉积 相(物质) 增长率 氮气 化学工程 沉积(地质) 基质(水族馆) 分析化学(期刊) 纳米技术 化学 复合材料 计算机科学 有机化学 物理 人工智能 古生物学 工程类 地质学 几何学 图像(数学) 海洋学 生物 量子力学 数学 沉积物
作者
C.J. Tang,A.J.S. Fernandes,Margarida Facão,Alexandre F. Carvalho,Weixia Chen,Haihong Hou,F.M. Costa
出处
期刊:Materials [Multidisciplinary Digital Publishing Institute]
卷期号:17 (12): 2976-2976
标识
DOI:10.3390/ma17122976
摘要

Nanocrystalline diamond (NCD) films are attractive for many applications due to their smooth surfaces while holding the properties of diamond. However, their growth rate is generally low using common Ar/CH4 with or without H2 chemistry and strongly dependent on the overall growth conditions using microwave plasma chemical vapor deposition (MPCVD). In this work, incorporating a small amount of N2 and O2 additives into CH4/H2 chemistry offered a much higher growth rate of NCD films, which is promising for some applications. Several novel series of experiments were designed and conducted to tailor the growth features of NCD films by fine-tuning of the gas-phase compositions with different amounts of nitrogen and oxygen addition into CH4/H2 gas mixtures. The influence of growth parameters, such as the absolute amount and their relative ratios of O2 and N2 additives; substrate temperature, which was adjusted by two ways and inferred by simulation; and microwave power on NCD formation, was investigated. Short and long deposition runs were carried out to study surface structural evolution with time under identical growth conditions. The morphology, crystalline and optical quality, orientation, and texture of the NCD samples were characterized and analyzed. A variety of NCD films of high average growth rates ranging from 2.1 μm/h up to 6.7 μm/h were successfully achieved by slightly adjusting the O2/CH4 amounts from 6.25% to 18.75%, while that of N2 was kept constant. The results clearly show that the beneficial use of fine-tuning of gas-phase compositions offers a simple and effective way to tailor the growth characteristics and physical properties of NCD films for optimizing the growth conditions to envisage some specific applications.
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