Esr Of Defects In Surface Conduction Layer On Cvd Diamond Films

1995 ◽  
Vol 416 ◽  
Author(s):  
Y. Show ◽  
M. Iwase ◽  
T. Izumi
Keyword(s):  
Surface Layer ◽  
Spin Density ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Conductive Layer ◽  
Diamond Deposition ◽  
Defect Center ◽  
Hydrogen Radical ◽  
Surface Conduction ◽  
Conduction Layer

ABSTRACTDefects in the surface conductive layer of CVD-diamond films have been investigated by ESR method. ESR analysis revealed that defect center ( Pac-center: g=2.003, ΔΔ Hpp=8 Oe ) in the non-diamond phase carbon region exists in the surface conductive layer. The Pac-center with a spin density of the order of 1020spins/cm3 or above was formed in the surface layer by hydrogen radical irradiation during the diamond deposition. Formation of the Pac-center causes the resistivity of CVD-diamond to decrease ( from 9 × 108 Ω to 1.8 × 106 Ω )

Correlation Between Defects and Electrical Conduction in Surface Conductive Layer of CVD-diamond Films

1996 ◽  
Vol 442 ◽  
Author(s):  
Y. Show ◽  
F. Matsuoka ◽  
S. Ri ◽  
Y. Akiba ◽  
T. Kurosu ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Carbon Atom ◽  
Electron Spin ◽  
Electrical Conduction ◽  
Nearest Neighbor ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Conductive Layer ◽  
Dangling Bond ◽  
Spin Resonance

Correlation between defects and electrical conduction in surface conductive layers of CVD diamond films has been studied using electron spin resonance ( ESR ) and two points probe technique methods. The ESR analysis revealed the presence of Pac-center with spin density of 1020 spins/cm3. The Pac-center is composed from two ESR signals: ESR signal from carbon dangling bond with carbon atom neighbors and ESR signal from carbon dangling bond associated with nearest neighbor hole ( hole associated Pac-center ). The hole associated Pac-center is an electrically active defect.

scholarly journals Diamond Deposition on Iron and Steel Substrates: A Review

Micromachines ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 719
Author(s):  
Xiaoju Li ◽  
Lianlong He ◽  
Yuanshi Li ◽  
Qiaoqin Yang
Keyword(s):  
Corrosion Resistance ◽  
Hot Corrosion ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Film Deposition ◽  
Diamond Growth ◽  
Diamond Deposition ◽  
Persistent Problem ◽  
New Findings ◽  
Steel Substrates

This article presents an overview of the research in chemical vapor deposition (CVD) diamond films on steel substrates. Since the steels are the most commonly used and cost-effective structural materials in modern industry, CVD coating diamond films on steel substrates are extremely important, combining the unique surface properties of diamond with the superior toughness and strength of the core steel substrates, and will open up many new applications in the industry. However, CVD diamond deposition on steel substrates continues to be a persistent problem. We go through the most relevant results of the last two and a half decades, including recent advances in our group. This review discusses the essential reason of the thick catalytic graphite interlayer formed on steel substrates before diamond deposition. The high carbon diffusion in iron would induce severe internal carburization, and then voluminous graphite precipitated from the substrate. In order to hinder the catalytic graphite formation, various methods have been applied for the adherent diamond film deposition, such as pre-imposed various interlayers or multi-interlayers, special controls of the deposition process, the approaches of substrate alloying and so on. We found that adherent diamond films can be directly deposited on Al alloying steel substrates, and then the role of Al alloying element was examined. That is a thin dense amorphous alumina sublayer in situ formed on the alloying substrate, which played a critical role in preventing the formation of graphite phase and consequently enhancing diamond growth and adhesion. The mechanism of Al alloying suggests that the way used to improve hot corrosion resistance is also applicable. Then, some of the hot corrosion resistance methods, such as aluminizing, siliconizing, and so on, which have been used by some researchers examining CVD diamond films on steel substrates, are reviewed. Another way is to prepare diamond-like carbon (DLC) films on steel substrates at low temperature, and then the precipitated graphite from the internal carburization can be effectively avoided. In addition, based on some new findings, the understanding of the diamond nucleation and metastable growth is discussed.

Hydrogen embrittlement of titanium during microwave plasma assisted CVD diamond deposition

2000 ◽  
Vol 16 (4) ◽  
pp. 355-360 ◽  
Author(s):  
Y. Fu ◽  
B. Yan ◽  
N.L. Loh ◽  
C.Q. Sun ◽  
P. Hing
Keyword(s):  
Hydrogen Embrittlement ◽  
Microwave Plasma ◽  
Cvd Diamond ◽  
Diamond Deposition

PTIS investigation of hydrogenated CVD diamond films

2005 ◽  
Vol 202 (11) ◽  
pp. 2171-2176 ◽  
Author(s):  
A. Hikavyy ◽  
P. Clauws ◽  
W. Deferme ◽  
G. Bogdan ◽  
K. Haenen ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond

Enhanced Tribological Performance of CVD Diamond Films Enabled by Using Graphene Layers as Solid Lubricant

2016 ◽  
Vol 1136 ◽  
pp. 573-578 ◽  
Author(s):  
Su Lin Chen ◽  
Bin Shen ◽  
Fang Hong Sun
Keyword(s):  
Tungsten Carbide ◽  
Solid Lubricant ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Tribological Performance ◽  
Chemical Vapor Deposition Method ◽  
Dry Sliding ◽  
Graphene Layers ◽  
Sliding Interface ◽  
Graphene Flakes

The present study reports the influence of graphene layers on the tribological performance of CVD diamond films when they are used as the solid lubricants. Friction tests are conducted on a ball-on-plate friction tester, where the stainless steel is used as the counterpart material. The CVD diamond film sample is a typical microcrystalline diamond (MCD) coating which is deposited on a flat tungsten carbide substrate using the hot filament chemical vapor deposition method (HFCVD). Besides the MCD sample, a polished MCD film (pMCD) and a polished tungsten carbide (pWC) are also adopted in frictional tests, aiming at illustrating the influence of the surface morphology, as well as the physical property, of the sample on the lubricative effect of graphene layers. The experimental results show that graphene layers can effectively reduce the coefficient of friction (COF), regardless of the samples. The MCD sample presents the lowest stable COF, which is 0.13, in dry sliding period when the graphene flakes are sparyed on the sliding interface; while the pMCD and pWC samples exhibit slightly higher COFs, which are 0.16 and 0.18, respectively. Comparatively, the COFs of these three samples obtained in dry sliding process without graphene are 0.20, 0.25 and 0.64. In additon, the MCD sample exhibits a much longer stable dry slidng process which is more than 5000 cycles. Comparatively, the other two tribo-pairs only exhibit a stable low-COF dry sliding period for around 2000 cycles. The reduction of COF could be attributed to the graphene flakes adhered on the sliding interface. It forms a layer of solid lubricative film with extremely low shear strength and significantly decreases the interactions between two contacted surfaces. The rugged surface of the MCD film provides sufficient clogging locations for graphene flakes, which allows the generated lubricative film enduring a long sliding duration. It can be arrived from this study that the tribological properties of the MCD film could be enhanced by simply adoping graphene layers as a solid lubricant. Furthermore, an improved performance of a variety of MCD coated cutting tools or mechanical components could be expected when they are utilized with graphene layers.

Application of Ion Beam Enhanced Deposition to Metallization of CVD Diamond Films

1998 ◽  
Vol 169 (1) ◽  
pp. R5-R6 ◽  
Author(s):  
N. B. Wong ◽  
G. Q. Li ◽  
S. M. Zhu ◽  
S. C. Tjong ◽  
S. T. Lee
Keyword(s):  
Ion Beam ◽  
Diamond Films ◽  
Cvd Diamond

Interface formation and properties of α-NPD thermally deposited on CVD diamond films

2003 ◽  
Vol 216 (1-4) ◽  
pp. 106-112 ◽  
Author(s):  
Min-Seung Chun ◽  
Tokuyuki Teraji ◽  
Toshimichi Ito
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
Interface Formation

scholarly journals Thick heavily boron doped CVD diamond films homoepitaxially grown on (111)-oriented substrates

2017 ◽  
Vol 79 ◽  
pp. 108-111 ◽  
Author(s):  
A. Boussadi ◽  
A. Tallaire ◽  
O. Brinza ◽  
M.A. Pinault-Thaury ◽  
J. Achard
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
Boron Doped

Study of the Interface Microstructures of CVD Diamond Films by TEM

2000 ◽  
Vol 132 (2-4) ◽  
pp. 315-321 ◽  
Author(s):  
Alexander G. Fitzgerald ◽  
Yongchang Fan ◽  
Phillip John ◽  
Clare E. Troupe ◽  
John I. B. Wilson ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond
Sign in / Sign up

Export Citation Format

Share Document