785 nm Raman spectroscopy of CVD diamond films

May, Paul; Smith, James A.; Rosser, KN

doi:10.1016/j.diamond.2007.12.013

Cited by 41 publications

(21 citation statements)

References 22 publications

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“…This proves that the implanted layer is free from graphitic bonds which is in agreement with the study as reported in [13]. The first and second order of Silicon substrate Raman peaks are found at the wave number 500 and 1000 cm -1 as corfirmed by May et al [14]. Asymmetry peak profile at wave number 1120 cm -1 may be related to the Fano lineshape due to quantum mechanical interference induced by boron dopant as reported in [15] and this Fano interference effects were much reduced for the smaller grain sized.…”

Section: Raman Spectroscopysupporting

confidence: 80%

Scanning transmission electron microscopy (STEM) study on surface modified CVD diamond/Si(111) film post implanted Fe-B and NiFe-B related to GMR properties

Purwanto¹,

Iskandar

Dimyati

2016

AIP Conference Proceedings

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Synthesis and characterisation of composite based biohydroxyapatite bovine bone mandible waste (BHAp) doped with 10 wt % amorphous SiO 2 from rice husk by solid state reaction AIP Conference Proceedings 1725, 020009 (2016) (denoted as B-E1D1). Based on FPP measurement at room temperature (RT) and H applied =8 kOe , A-E3D1 sample has MR ratio almost 80% and MR ratio in B-E1D1 sample is 45%. Based on STEM-EDX investigation, there are two aspects of how MR ratio of A-E3D1 more higher than those of B-E1D1. Firstly, surface nanostructure on the top of A-E3D1 film is more grazing than on the top of B-E1D1. Analysis with Scanning Transmission Electron Microscope (STEM) equipped with Electron Energy Loss Spectroscopy (EELS) the growth of amorphous carbon layer on top of the implanted diamond film with thickness around 100 nm and only 20 nm on the no implanted sample have observed. Boron atoms were found inside the carbon amorphous layer distributed homogenously. Secondly, oxygen content at the interface between diamond film and silicon substrate in sample A-E3D1 was lower than those in B-E1D1 sample. This condition gives the resistance value in A-E3D1 lower than value in B-E1D1. This result is close to the Raman Spectroscopy data measurement which obviously suggests changes on the Raman spectrum due to implantation related to Oxygen excitation from B-E1D1 sample.

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Section: Raman Spectroscopysupporting

confidence: 80%

Scanning transmission electron microscopy (STEM) study on surface modified CVD diamond/Si(111) film post implanted Fe-B and NiFe-B related to GMR properties

Purwanto¹,

Iskandar

Dimyati

2016

AIP Conference Proceedings

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“…P. W. May et al related peaks in the range of 1459 cm −1 to 1465 cm −1 to trans-polyacetylene. 20 The results presented in this work have demonstrated that it is possible to deposit a mixture of amorphous carbon, graphite, DLC, microdiamond and nanodiamond on silicon substrates with low voltage and close to room temperature. The structures deposited have been of non-homogeneous films and with low deposition rates, of around 0.1 μm.h −1 .…”

Section: Resultsmentioning

confidence: 79%

Electro-Deposition of Carbon Structures at Mid Voltage and Room Temperature Using Ethanol/Aqueous Solutions

Tsukada¹,

Barbosa²,

Silva³

et al. 2012

J. Electrochem. Soc.

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Direct syntheses of carbon structures including nanodiamond, microdiamond and diamond-like carbon (DLC) on silicon wafers by liquid phase electro-deposition are presented. The solution (ethanol/water) was employed as electrolyte at different concentration levels. Assays were carried out maintaining constant the electric potential between the silicon electrodes in the range of (80−300 V) at current density of approximately 2.0 mA/cm 2 . Scanning electron microscopy showed that non-uniform, smooth and heterogeneous structures were produced. The structural composition was evaluated by micro-Raman spectroscopy. A mechanism for the formation of sp 3 and sp 2 hybridizations is proposed.Diamond and carbon related materials have been considered promising materials for many industrial applications due to their superb physicochemical properties such as high hardness, low friction coefficient, wear resistance, high thermal conductivity, chemical inertness, and good biocompatibility, among others. 1-4 Diamond and carbon related materials have been produced by a variety of chemical vapor deposition techniques (CVD), 1, 2 as well as the low temperature deposition process, such as the electro-deposition. 3,4 The first attempt to grow carbon films by electro-deposition technique was reported by Namba 5 and ever since that, others groups have used such technique for carbon films preparation. 3-14 Sreejith et al. obtained diamond-like carbon (DLC) at low voltages (80-300 V) and 1 mm interelectrode separation, which gives electric fields of 0.08-0.3 Vm −1 . 11 Graphite and silicon were employed as electrodes (anode/cathode) and ethanol as electrolyte. It is still not clear whether the carbon film deposited had as its source the electrolyte, or the graphite electrode itself or both.In this work we report the results of our investigation on electrodeposition of carbon films containing nanodiamond and diamond inclusions, diamond-like carbon (DLC) and graphitic phases on silicon wafers, which were submerged in an aqueous ethanol solution. All assays were run at room temperature, without heating or cooling and with a low energy consumption. Raman spectra and scanning electron microscopy images are presented and discussed, and a mechanism for the formation of the sp 3 and sp 2 hybridization/bonding is proposed. ExperimentalMirror polished pieces of n-type silicon (100) with resistivity of about 1 .cm and dimensions of 30 × 10 × 0.3 mm 3 were used as electrodes (anode and cathode). Prior to deposition process, the silicon substrates were cleaned by ultrasonic treatment in acetone for 30 min. The electrolyte was a solution constituted of analytical grade Merck R ethanol and deionized water. The solution was not agitated during the deposition process. The distance between the electrodes was fixed at 25 mm, the same value for all experiments. The voltage applied between the electrodes was maintained constant during each experiment and ranged from 80 V to 300 V. Heating or cooling was never applied, so the temperature of the system had a slig...

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“…Ferrari & Robertson (2001) assigned both peaks to transpolyacetylene at grain boundaries and surfaces of nanodiamonds. The weak peak at ∼1020 cm −1 along with the broad feature centered at ∼1270 cm −1 are also associated with nanodiamonds (Veres et al 2007;May et al 2008), and the broad doublet at ∼1800 and 1900 cm −1 may be due to overtones and/or combinations. In the 2000-4000 cm −1 region (not shown), the Raman spectra show broad CH-stretching peaks centered at ∼2900 cm −1 in Figure 1.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Infrared Spectroscopy of Carbonaceous-chondrite Inclusions in the Kapoeta Meteorite: Discovery of Nanodiamonds with New Spectral Features and Astrophysical Implications

Abdu

Hawthorne

Varela

2018

ApJL

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We report the finding of nanodiamonds, coexisting with amorphous carbon, in carbonaceous-chondrite (CC) material from the Kapoeta achondritic meteorite by Fourier-transform infrared (FTIR) spectroscopy and microRaman spectroscopy. In the C-H stretching region (3100-2600 cm −1 ), the FTIR spectrum of the Kapoeta CC material (KBr pellet) shows bands attributable to aliphatic CH 2 and CH 3 groups, and is very similar to IR spectra of organic matter in carbonaceous chondrites and the diffuse interstellar medium. Nanodiamonds, as evidenced by micro-Raman spectroscopy, were found in a dark region (∼400 μm in size) in the KBr pellet. Micro-FTIR spectra collected from this region are dramatically different from the KBr-pellet spectrum, and their C-H stretching region is dominated by a strong and broad absorption band centered at ∼2886 cm −1 (3.47 μm), very similar to that observed in IR absorption spectra of hydrocarbon dust in dense interstellar clouds. Micro-FTIR spectroscopy also indicates the presence of an aldehyde and a nitrile, and both of the molecules are ubiquitous in dense interstellar clouds. In addition, IR peaks in the 1500-800 cm −1 region are also observed, which may be attributed to different levels of nitrogen aggregation in diamonds. This is the first evidence for the presence of the 3.47 μm interstellar IR band in meteorites. Our results further support the assignment of this band to tertiary CH groups on the surfaces of nanodiamonds. The presence of the above interstellar bands and the absence of shock features in the Kapoeta nanodiamonds, as indicated by Raman spectroscopy, suggest formation by a nebular-condensation process similar to chemical-vapor deposition.

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785 nm Raman spectroscopy of CVD diamond films

Cited by 41 publications

References 22 publications

Scanning transmission electron microscopy (STEM) study on surface modified CVD diamond/Si(111) film post implanted Fe-B and NiFe-B related to GMR properties

Scanning transmission electron microscopy (STEM) study on surface modified CVD diamond/Si(111) film post implanted Fe-B and NiFe-B related to GMR properties

Electro-Deposition of Carbon Structures at Mid Voltage and Room Temperature Using Ethanol/Aqueous Solutions

Infrared Spectroscopy of Carbonaceous-chondrite Inclusions in the Kapoeta Meteorite: Discovery of Nanodiamonds with New Spectral Features and Astrophysical Implications

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