Local order in CVD diamond films : Comparative Raman, x-ray-diffraction, and x-ray-absorption near-edge studies

Fayette, L.; Marcus, B.; Mermoux, Michel; Tourillon, G.; Laffon, K.; Parent, P.; Normand, F. Le

doi:10.1103/physrevb.57.14123

Cited by 81 publications

(58 citation statements)

References 30 publications

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“…35 The peak at 302.5 eV is evidence of the significantly reduced absolute second band gap dip, which indicate that the Au-ion irradiation generates defective crystalline structure in the small diamond grain. 36 The spectral changes due to the Au-ion irradiation are moderate for fluences less than critical flunce (i.e., f c = 5 × 10 12 ions/cm 2 ), while for the highest fluence (curve I c -I) the changes are much more intense. The most dramatic change is the broad peak developed at ∼ 288.3 eV, which is originated from the defect induced surface states, as reported by Gago et al based on the studies on ion beam damaged diamond surface.…”

Section: A the Overall Au-ion Irradiation Effectmentioning

confidence: 99%

The potential application of ultra-nanocrystalline diamond films for heavy ion irradiation detection

Chen

Wang

et al. 2013

AIP Advances

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The potential of utilizing the ultra-nanocrystalline (UNCD) films for detecting the Au-ion irradiation was investigated. When the fluence for Au-ion irradiation is lower than the critical value (fc = 5.0 × 1012 ions/cm2) the turn-on field for electron field emission (EFE) process of the UNCD films decreased systematically with the increase in fluence that is correlated with the increase in sp2-bonded phase (π*-band in EELS) due to the Au-ion irradiation. The EFE properties changed irregularly, when the fluence for Au-ion irradiation exceeds this critical value. The transmission electron microscopic microstructural examinations, in conjunction with EELS spectroscopic studies, reveal that the structural change preferentially occurred in the diamond-to-Si interface for the samples experienced over critical fluence of Au-ion irradiation, viz. the crystalline SiC phase was induced in the interfacial region and the thickness of the interface decreased. These observations implied that the UNCD films could be used as irradiation detectors when the fluence for Au-ion irradiation does not exceed such a critical value

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Section: A the Overall Au-ion Irradiation Effectmentioning

confidence: 99%

The potential application of ultra-nanocrystalline diamond films for heavy ion irradiation detection

Chen

Wang

et al. 2013

AIP Advances

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“…The main feature common to all of the carbon K-edge absorption spectra can be attributed to a 1s to π* resonance due to the presence of unsaturated hydrocarbons. There were no distinct features in the 1s to σ* region (~290-320 eV) which would indicate the formation of a well ordered form of carbon, such as in the case of highly ordered graphite [49]. The 3.5% V/alumina and 8% V/alumina had similar K-edges, which corresponded to disordered carbon [50].…”

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confidence: 96%

The role of carbon species in heterogeneous catalytic processes: an in situ soft x-ray photoelectron spectroscopy study

Vass

Hävecker

Zafeiratos

et al. 2008

J. Phys.: Condens. Matter

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High pressure X-ray photoelectron spectroscopy (XPS) is used to characterize heterogeneous catalytic processes. The success of the new technique based on the possibility to correlate the catalytic activity and the electronic structure of an active surface. The dynamic character of a catalyst surface can be demonstrated impressively by this technique. In this contribution the basics of high pressure XPS will be discussed. Three examples of heterogeneous catalytic reactions are presented in this contribution. The selective hydrogenation of 1-pentyne over Pd based catalysts and the dehydrogenation of n-butane and the oxidation of ethylene over V based catalysts. It is shown, that the formation of subsurface carbons plays an important role in all the examples. The incorporated carbon changes the electronic structure of the surface and so controls the selectivity of the reaction. A change of the educts in the reaction atmosphere induces modifications of the electronic surface structure of the operation catalysts.

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“…The shoulder peak at a1140 cm -1 is usually referred to the signature of nanodiamond [15] and/or is accompanied by another peak at a1480 cm -1 related to the presence of transpolyacetylene (TPA) states in the grain boundaries of NCD films [16]. When the nitrogen concentration increased, the peak around 500 cm -1 decreased continually (inset of Fig.…”

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confidence: 99%

Effect of nitrogen on deposition and field emission properties of boron-doped micro- and nano-crystalline diamond films

Cheng

et al. 2010

Nano-Micro Lett.

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In this paper, we report the effect of nitrogen on the deposition and properties of boron doped diamond films synthesized by hot filament chemical vapor deposition. The diamond films consisting of micro-grains (nano-grains) were realized with low (high) boron source flow rate during the growth processes. The transition of micro-grains to nano-grains is speculated to be strongly (weekly) related with the boron (nitrogen) flow rate. The grain size and Raman spectral feature vary insignificantly as a function of the nitrogen introduction at a certain boron flow rate. The variation of electron field emission characteristics dependent on nitrogen is different between microcrystalline and nanocrystalline boron doped diamond samples, which are related to the combined phase composition, boron doping level and texture structure. There is an optimum nitrogen proportion to improve the field emission properties of the boron-doped films. [5][6][7] affected by doping have been extensively investigated. However, in previous work, the understanding on how the dopants (mainly refer to N and B) modify the growth and properties of diamond films was mostly emphasized on the sole doping by boron or nitrogen. Recently, there are a few reports on the diamond deposition with co-dopants [8,9]. Hartmann et al. [8] reported that in highly boron-doped micro-diamond, large (small) additions of nitrogen would stabilize the diamond structure (induce more graphite formation). The electronic structure of boron-doped nano-diamond films can be markedly modified by nitrogen and there was an optimized gas proportion to achieve improved field emission [9]. However, the corresponding underlying mechanism is still not very clear. Furthermore, growth features related to the co-doping of boron and nitrogen are desirable to be investigated in detail.In this letter, by hot filament CVD (HFCVD), the microcrystalline diamond (MCD) and nanocrystalline diamond (NCD) films with co-introducing boron and nitrogen were synthesized by adjusting the gas proportion of nitrogen and boron in the reaction ambient. The effect of nitrogen on the

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Local order in CVD diamond films : Comparative Raman, x-ray-diffraction, and x-ray-absorption near-edge studies

Cited by 81 publications

References 30 publications

The potential application of ultra-nanocrystalline diamond films for heavy ion irradiation detection

The potential application of ultra-nanocrystalline diamond films for heavy ion irradiation detection

The role of carbon species in heterogeneous catalytic processes: an in situ soft x-ray photoelectron spectroscopy study

Effect of nitrogen on deposition and field emission properties of boron-doped micro- and nano-crystalline diamond films

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