Optical and electronic properties of nitrogen-implanted diamond-like carbon films

1994 ◽  
Vol 9 (1) ◽  
pp. 85-90 ◽  
Author(s):  
G.L. Doll ◽  
J.P. Heremans ◽  
T.A. Perry ◽  
J.V. Mantese
Keyword(s):  
Amorphous Carbon ◽  
Carbon Film ◽  
Film Surface ◽  
Carbon Films ◽  
Localized States ◽  
Diamond Like Carbon ◽  
Nitrogen Implantation ◽  
Electrical Measurements ◽  
Nitrogen Ion ◽  
Ion Implanted

Optical and electrical measurements on nitrogen ion-implanted diamond-like carbon films are presented. Raman scattering measurements, which probe the crystallinity of the film surface, indicate that nitrogen implantation reduces the finite crystallographic order in the pristine carbon films. The absence of molecular vibrations in the infrared absorption spectra of the films argues against a polymeric structure of the ion-implanted films. Spectroscopic ellipsometry experiments determine the change in the optical constants of the carbon film due to nitrogen implantation. Electrical de conductivity measurements are interpreted within the framework of a schematic density of states picture of graphitic τ-electrons in an amorphous carbon system. Taken collectively, the optical and electrical measurements suggest that nitrogen implantation increases the density of localized states within the 1.5 eV bandgap of the quasi-amorphous carbon film, thereby reducing the bandgap and increasing the conductivity of the nitrogen-implanted films.

Bonding in Ion-Implanted Carbon Films Characterized by TEM Spectrum Lines and Energy-Filtered Imaging

1999 ◽  
Vol 589 ◽  
Author(s):  
J. Bentley ◽  
K.C. Walter ◽  
N.D. Evans
Keyword(s):  
Energy Shift ◽  
Carbon Films ◽  
Binding Energies ◽  
Diamond Like Carbon ◽  
Nitrogen Implantation ◽  
Electron Energy Loss Spectrometry ◽  
Spectrum Imaging ◽  
Binding Energy Shift ◽  
Electron Energy Loss ◽  
Ion Implanted

AbstractIon-implanted diamond-like carbon (DLC) films have been characterized by techniques based on electron energy-loss spectrometry using an imaging energy filter on a 300kV TEM. Nitrogen implantation results in increased sp2 bonding and a 1.3 eV shift to higher binding energies for carbon-K. Argon implantation results in a smaller increase in sp2bonding with no detectable binding energy shift. The fraction of implanted species retained is much smaller for Ar than for N. Differences in behavior between N- and Ar-implanted DLC are consistent with expected chemical reactions. Preliminary results demonstrate the feasibility of mapping the Φ*/σ* intensity (sp2/sp3) ratio by energy-filtered TEM as an alternative to spectrum imaging in STEM mode

Friction and Wear Micromechanisms of Amorphous Carbon Thin Films

1997 ◽  
Vol 119 (4) ◽  
pp. 823-829 ◽  
Author(s):  
B. Wei ◽  
K. Komvopoulos
Keyword(s):  
Amorphous Carbon ◽  
Friction And Wear ◽  
Carbon Film ◽  
Film Surface ◽  
Carbon Films ◽  
Film Structure ◽  
Friction Behavior ◽  
Surface Microtopography ◽  
Carbon Overcoats ◽  
Magnetic Recording Heads

The friction and wear micromechanisms of amorphous hydrogenated carbon films were investigated experimentally using commercially available thin-film rigid disks with sputtered carbon overcoats and Al2O3TiC magnetic recording heads. Continuous sliding tests demonstrated the existence of two distinct friction and wear regimes characterized by different dominant micromechanisms. Scanning electron microscopy and Raman spectroscopy revealed that the evolution of friction in the first regime is due to changes of the surface microtopography and the film structure from amorphous carbon to polycrystalline graphite. Atomic force microscopy showed that the topography changes result from asperity nanofracture leading to the gradual removal of carbon material and the generation of ultrafine wear debris. The friction behavior in the second regime is due to various wear processes arising on the carbon film surface. High friction promotes surface micropitting and the formation of significantly deeper and wider texture marks. The erratic fluctuations of the friction force and microplowing of the carbon film at steady state are attributed to the relatively large wear particles generated by micropitting.

Diamond-Like Carbon Film Propertffis From Optical and Electrical Measurements

1996 ◽  
Vol 446 ◽  
Author(s):  
A. Dalton ◽  
P.B. Kosel ◽  
R. Monreal ◽  
S. Frees-carr ◽  
J. Weimer ◽  
...  
Keyword(s):  
Carbon Film ◽  
Carbon Films ◽  
High Resistivity ◽  
Visible Range ◽  
Ultraviolet Region ◽  
Diamond Like Carbon ◽  
Smooth Surfaces ◽  
Electrical Measurements ◽  
Substrate Surfaces ◽  
Low Pressures

AbstractHigh resistivity diamond-like carbon films have been grown on a variety of substrate surfaces using RF generated high-current hydrocarbon ion beams at low pressures. Stable films have been obtained in the thickness range of 0.3 to 1.2 �m with resistivities exceeding 1013 O-cm. These films have been deposited on smooth surfaces such as oxidized silicon, glass, quartz, aluminum and plastics. The films have smooth surfaces, great hardness and moderate dielectric constant (2.2 to 3.5). Optical absorption measurements show that these films are highly absorbing in the ultraviolet region of the spectrum and in the visible range their absorption coefficients exceed 104 cm-1 and the refractive indices fall in the range 1.75 to 2.17 at 632.8 nm.

scholarly journals Analysis on Self-Organized Formation of Nanofibers on Diamond-Like Carbon Film Surface during RF O2 Plasma Etching

2013 ◽  
Vol 38 (3) ◽  
pp. 447-450 ◽  
Author(s):  
Toru Harigai ◽  
Koyo Iwasa ◽  
Hirofumi Koji ◽  
Noriko Nitta ◽  
Hiroshi Furuta ◽  
...  
Keyword(s):  
Plasma Etching ◽  
Carbon Film ◽  
Film Surface ◽  
Diamond Like Carbon ◽  
Self Organized ◽  
Diamond Like Carbon Film ◽  
O2 Plasma

Structural Analysis of Boron- and Nitrogen-Doped Amorphous Carbon Films from Bio-Product

2020 ◽  
Vol 860 ◽  
pp. 190-195
Author(s):  
Irma Septi Ardiani ◽  
Khoirotun Nadiyyah ◽  
Anna Zakiyatul Laila ◽  
Sarayut Tunmee ◽  
Hideki Nakajima ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Amorphous Carbon ◽  
Carbon Film ◽  
Carbon Films ◽  
Basic Material ◽  
Carbon Phase ◽  
Amorphous Carbon Film ◽  
Amorphous Carbon Films ◽  
Nitrogen Doped ◽  
P Type

Amorphous carbon films have been explored and used in a wide variety of applications. With the n-type and p-type amorphous carbon film, it can be used to make p-n junctions for solar cells. This research aims to study the structure of boron- and nitrogen-doped amorphous carbon (a-C:B and a-C:N) films. This research uses the basic material of bio-product from palmyra sugar to form amorphous carbon. Amorphous carbon was synthesized by heating the palmyra sugar at 250°C. The results of XRD showed that the doped films produce an amorphous carbon phase. PES was used to analyze the bonding state of dopants in the sample. B4C, BC3, and BC2O bonds formed in a-C:B, while pyridine and pyrrolic formed in a-C:N.

scholarly journals Elastic Constants of Diamond-Like Carbon Films by Surface Brillouin Scattering

1999 ◽  
Vol 593 ◽  
Author(s):  
A.C. Ferrari ◽  
J. Robertson ◽  
R. Pastorelli ◽  
M.G. Beghi ◽  
C.E. Bottani
Keyword(s):  
Thin Films ◽  
Amorphous Carbon ◽  
Elastic Constants ◽  
Acoustic Waves ◽  
Brillouin Scattering ◽  
Surface Acoustic Waves ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Amorphous Carbon Films ◽  
Tetrahedral Amorphous Carbon

ABSTRACTThe elastic constants of thin Diamond-Like Carbon (DLC) films supply important information, but their measurement is difficult. Standard nanoindentation does not directly measure the elastic constants and has strong limitations particularly in the case of hard thin films on softer substrates, such as tetrahedral amorphous carbon on Si. Surface acoustic waves provide a better mean to investigate elastic properties. Surface Brillouin scattering (SBS) intrinsically probes acoustic waves of the wavelength which is appropriate to test the properties of films in the tens to hundreds of nanometers thickness range. SBS can be used to derive all the isotropic elastic constants of hard-on-soft and soft-on-hard amorphous carbon films of different kinds, with thickness down to less than 10 nm. The results help to resolve the previous uncertainties in mechanical data. The Young's modulus of tetrahedral amorphous carbon (ta-C) turns out to be lower than that of diamond, while the moduli of hydrogenated ta-C (ta-C:H) are considerably lower than those of ta-C because of the weakening effect of C-H bonding.

The Biocompatibility of Ti Alloy Improved by Nitrogen-Doped Diamond-Like Carbon Films

2014 ◽  
Vol 711 ◽  
pp. 250-254 ◽  
Author(s):  
Wufanbieke Baheti ◽  
Ming Xin Li ◽  
Fu Guo Wang ◽  
Jin Ge Song ◽  
Long Hua Xu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Carbon Film ◽  
Chemical Vapor ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Measuring Device ◽  
Nitrogen Doped ◽  
Angle Measuring ◽  
N Doping

The nitrogen-doped diamond-like carbon film was prepared on Ti6Al4V alloy by using plasma enhanced chemical vapor deposition (PECVD) technique,and its biocompatibility was studied.The surface morphology,chemical composition and contact angle were measured by scanning electron microscope (SEM),X-ray photoelectron spectroscopy(XPS),Raman Spectrometer and contact angle measuring device. Finally, the proliferation rate and cellular morphology of 3T3-E1 osteoblast cells on different sample surfaces were tested and Image J software was used to statistically analyze the count of the adhered cells. The results showed that cell adhesion and proliferation were significantly (P<0.05) increased on nitrogen-doped diamond-like carbon films , which illustrated that N doping improved the biocompatibility of DLC films. This finding has potential clinical application value to modify titanium alloy for new bone formation.

Formation of diamondlike nanocrystallites in amorphous carbon films synthesized by radio-frequency sputtering

2008 ◽  
Vol 23 (3) ◽  
pp. 700-703 ◽  
Author(s):  
D. Wan ◽  
K. Komvopoulos
Keyword(s):  
Carbon Atom ◽  
Radio Frequency ◽  
Amorphous Carbon ◽  
Rf Sputtering ◽  
Film Surface ◽  
Carbon Films ◽  
Fast Fourier Transformation ◽  
Process Conditions ◽  
Tem Analysis ◽  
Radio Frequency Sputtering

Transmission electron microscopy (TEM) and fast Fourier transformation (FFT) analysis were used to examine the microstructures of amorphous carbon (a-C) films deposited on Si(100) by radio-frequency (rf) sputtering without magnetron. TEM analysis revealed that a-C films synthesized under certain deposition conditions contained randomly dispersed nanocrystallites ∼35 Å in size. FFT results indicated that the nanocrystallites possessed diamondlike cubic structures with their close-packed {111} planes parallel to the film surface. The formation of diamondlike nanocrystallites is attributed to metastable carbon atom clusters of trigonal carbon hybridization that were sputtered off from the graphite target under certain process conditions. Cluster distortion upon deposition onto the growing film surface by the bombarding Ar+ ions promoted tetrahedral carbon atom hybridization and, possibly, epitaxial growth of diamondlike nanocrystallites for a short duration.

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