Effect of Gas Pressure on Optical Properties of Nanocrystalline Diamond Films Deposited on SiC Substrates

2011 ◽  
Vol 347-353 ◽  
pp. 537-541
Author(s):  
Nan Chun Wu ◽  
Yi Ben Xia ◽  
Shou Hong Tan ◽  
Lin Jun Wang
Keyword(s):  
Optical Properties ◽  
Raman Scattering ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Gas Pressure ◽  
Nanocrystalline Diamond ◽  
Nanocrystalline Diamond Films ◽  
Scattering Spectra ◽  
Raman Scattering Spectra ◽  
G Ratio

With use of electron-assisted chemical vapor deposition technology, nanocrystalline diamond films were deposited on SiC ceramics substrates at various gas pressure ( 0.5 ~ 2 kPa ). Effect of the gas pressure on optical properties of the nanocrystalline diamond films was studied. Raman scattering spectra were measured. Photoluminescence spectra were investigated in the range of 420 ~ 680 nm. Spectroscopic ellipsometry were analyzed from the near IR to the UV region ( 1.5 ~ 5.0 eV ). Results show that, when the gas pressure increased from 0.5 to 2 kPa, Raman scattering intensity of diamond increase and D/G ratio decrease; when the gas pressure was 0.5kPa and 2kPa, there is not any PL peak, however, there is a stronger PL peak at 485 nm when the gas pressure was 1kPa; extinctive coefficient k for the nanocrystalline diamond films deposited at 1kPa increase obviously with increase of photo energy.

Study of Undoped Nanocrystalline Diamond Films Grown by Microwave Plasma-Assisted Chemical Vapor Deposition

2021 ◽  
Vol 55 (1) ◽  
pp. 66-75
Author(s):  
A. L. Vikharev ◽  
S. A. Bogdanov ◽  
N. M. Ovechkin ◽  
O. A. Ivanov ◽  
D. B. Radishev ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Microwave Plasma ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Nanocrystalline Diamond ◽  
Nanocrystalline Diamond Films

Surface Chemical Effects on the Optical Properties of Thin Nanocrystalline Diamond Films

1996 ◽  
Vol 423 ◽  
Author(s):  
A. V. Khomich ◽  
V. I. Polyakov ◽  
P. I. Perov ◽  
V. P. Varnin ◽  
I. G. Teremetskaya ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Transmission ◽  
Diamond Films ◽  
Nanocrystalline Diamond ◽  
Surface Chemical ◽  
Chemical Effects ◽  
Nanocrystalline Diamond Films ◽  
Hot Filament Cvd ◽  
Hot Filament ◽  
Highly Porous

AbstractThe effect of annealing in air on internal structure and optical properties of hot filament CVD nanocrystalline diamond films was investigated. Oxidation of the films lead to selective removal of intercrystallite layers with formation of highly porous structure with characteristic dimensions of several nanometers. Dramatic changes in optical transmission and Raman spectra were also observed. The origin of the two Raman spectrum maxima at 1140 and 500 cm−1 is discussed. Hydrogen absorption and desorption processes in porous diamond were studied.

Investigation on Field Electron Emission from Carbon Nanotubes on Nanocrystalline Diamond Films

2005 ◽  
Vol 23 ◽  
pp. 35-38 ◽  
Author(s):  
K.J. Liao ◽  
W.L. Wang ◽  
C. Cai ◽  
J.W. Lu ◽  
C.G. Hu
Keyword(s):  
Carbon Nanotubes ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Nanocrystalline Diamond ◽  
Electron Field Emission ◽  
Si Substrates ◽  
Turn On ◽  
Nanocrystalline Diamond Films ◽  
Electron Field ◽  
Hot Filament

The electron field emission from carbon nanotubes on nanocrystalline diamond films was investigated. Carbon nanotubes and nano-diamond films were deposited on Si substrates by hot filament chemical vapor deposition. The experimental results showed that the carbon nanotubes on nanostructured films exhibited a lower value of the turn-on electric field than those of carbon nanotubes and nano-diamond. It was found that the turn-on field of nanotubes on nano-diamond was about 0.9V/μm, which was lower than those of carbon nanotubes and nano-diamond.

scholarly journals Electronic and optical properties of boron-doped nanocrystalline diamond films

2009 ◽  
Vol 79 (4) ◽  
Author(s):  
W. Gajewski ◽  
P. Achatz ◽  
O. A. Williams ◽  
K. Haenen ◽  
E. Bustarret ◽  
...  
Keyword(s):  
Optical Properties ◽  
Diamond Films ◽  
Nanocrystalline Diamond ◽  
Electronic And Optical Properties ◽  
Boron Doped ◽  
Nanocrystalline Diamond Films

ENHANCED NUCLEATION AND SMOOTHNESS OF NANOCRYSTALLINE DIAMOND FILMS VIA W-C GRADIENT INTERLAYER

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1676-1682 ◽  
Author(s):  
QIUPING WEI ◽  
ZHIMING YU ◽  
LI MA ◽  
DENGFENG YIN
Keyword(s):  
Diamond Films ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Nanocrystalline Diamond ◽  
Cemented Carbide ◽  
Nucleation Density ◽  
Wear Properties ◽  
Nanocrystalline Diamond Films ◽  
And Performance ◽  
Cvd Diamond Coating

CVD diamond coating was deposited on to 13%wt. Co -containing tungsten cemented carbide surfaces using a hot filament chemical vapor deposition (HFCVD) to improve wear properties and performance of WC -13% wt . Co . Prior to the deposition of the diamond films, a W - C gradient intermediate layer had been sputtered on WC -13% wt . Co . The surface and cross-section morphology, phase transformation, and grain size distribution of the samples were investigated by means of field emission scanning electron microscope (SEM), X-ray diffractometer (XRD), and atomic force microscope (AFM), respectively. The results show that W - C gradient intermediate layers can effectively reduce the diffusion of Co in cemented carbide substrates during diamond deposition process, resulting high nucleation density and ultra smooth nanocrystalline diamond films.

Thermal Stability of Nanocrystalline Diamond Films Grown by Microwave Plasma Chemical Vapor Deposition

2002 ◽  
Vol 750 ◽  
Author(s):  
Mevlut Bulut ◽  
Shane A. Catledge ◽  
Yogesh K. Vohra ◽  
Renato P. Camata
Keyword(s):  
Thermal Stability ◽  
Vapor Deposition ◽  
Microwave Plasma ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Nanocrystalline Diamond ◽  
Plasma Chemical ◽  
Plasma Chemical Vapor Deposition ◽  
Nanocrystalline Diamond Films ◽  
Thermal Stability Of

ABSTRACTIn this work, the open-air thermal stability of nanocrystalline diamond films grown on mirror-polished titanium alloy substrates by the Microwave Plasma Chemical Vapor Deposition (MPCVD) technique was studied. The results of this investigation show that nanocrystalline diamond films are highly stable in air up to 600°C with no significant change in mechanical properties. Samples annealed between 600°C and 650°C, however, exhibit values of hardness lower by as much as 40% compared to as-grown samples. Above 650°C serious delamination effects were observed in the coatings.

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