Higher coverage of carboxylic acid groups on oxidized single crystal diamond (001)

Wang, Xianfen; Ruslinda, A. Rahim; Ishiyama, Yuichiro; Ishii, Yoko; Kawarada, Hiroshi

doi:10.1016/j.diamond.2011.08.011

Cited by 49 publications

(38 citation statements)

References 33 publications

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“…Impurity concentrations in specimens estimated from IR spectra with generally existing in type-Ia natural diamond crystals 25. As reported, high resolution X-ray photoelectron spectroscopy has confirmed that, in hydrogen atmosphere, the hydrogen-related structures, including monohydride, dihydride, and trihydride, are sufficiently formed on the diamond surface 26,27. Instead, the sp 3 bonded -CH 2 -and -CH 3 groups appear in as-synthesized crystals confirmed by IR spectra.…”

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confidence: 54%

Crystallization of HPHT diamond crystals in a floatage system under the influence of nitrogen and hydrogen simultaneously

et al. 2015

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Employing floatage as a driving force for diamond growth, crystallization of diamond crystals in Fe-Cr-C system co-doped with nitrogen and hydrogen elements is established at a static pressure of ∼6.5 GPa and a temperature range of 1335-1485 °C. Under the influence of nitrogen and hydrogen incorporated into diamond structure, simultaneously, a rich morphological diversity of diamond specimens is produced, such as hexagonal slice-shape, trapezoidal slice-shape, strip shape and triangular slice-shape crystals. Observation on infrared spectra from as-grown crystals indicates that a dramatic enhancement of the incorporation of hydrogen and nitrogen atoms with each other into diamond structure are present in strip-shape specimens, confirmed by a fact that a relatively high absorption coefficients at the peaks of 1130 cm -1 , and 1344 cm -1 accompany with high absorption coefficients at the bands of 2850 cm -1 , and 2920 cm -1 . Hydrogen-related absorption in three-phonon region further indicated that hydrogen atoms existed in diamond structure in sp 3 bonded -CH 2 -, and -CH 3 group form, respectively. At atmospheric pressure, these hydrogen-related structures are rather stable and can sustain high temperature up to 1800 °C. Nitrogen donors are universally observed as isolated substitutional form in crystals, while minor paired-form nitrogen atoms readily formed in the strip shape crystals or other crystals crystallized at higher temperature.

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confidence: 54%

Crystallization of HPHT diamond crystals in a floatage system under the influence of nitrogen and hydrogen simultaneously

et al. 2015

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“…Kanda et al 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 23 wt.%. Taking into account the data on diamond oxidation 25 we may suppose that complexes involving hydroxyl (C-OH) and carboxyl (O=C-OH) groups can act as impurities adsorbing on diamond faces. As a product of this experiment we found plane-faced octahedral diamond crystals without signs of growth inhibition and without formation of metastable graphite.…”

Section: Discussionmentioning

confidence: 99%

Effect of H₂O on Diamond Crystal Growth in Metal–Carbon Systems

Palyanov

Borzdov

Kupriyanov

et al. 2012

Crystal Growth & Design

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In this paper, we report on the influence of the H 2 O additive in metal melt on the growth processes, morphology and defect-and-impurity structure of diamond crystals. As a source of water, a mixture of Mg(OH) 2 and SiO 2 was used, which reacted under the experimental conditions following the reaction 2Mg(OH) 2 +SiO 2 =Mg 2 SiO 4 +2H 2 O. The main experiments were performed in the Ni 0.7 Fe 0.3 -C system at a pressure of 6 GPa, temperature of 1370 °C, duration of 15 hrs and H 2 O concentration (C H2O ) ranging from 0 to 0.5 wt.%. It is found that as H 2 O content increases from 0 to 0.2 wt.%, diamond morphology changes from bulky octahedra to {111} plate-like crystals and then to {111} dendrites. Further increases in C H2O in the range 0.22-0.4 wt.% result in crystallization of bulky rhombic dodecahedra and then {110} dendrites. At C H2O higher than approximately 0.43 wt.%, nucleation and growth of diamond are completely terminated and graphite only crystallizes. The systematic changes in diamond growth and morphology are accompanied by a decrease in nitrogen impurity concentration in diamond from 220-230 to 40-50 ppm, an increase in the density of micro-inclusions and appearance in IR spectra of a peak at 2840 cm -1 , related to hydrocarbons. *In this paper, we report on the influence of the H 2 O additive in metal melt on the growth processes, morphology and defect-and-impurity structure of diamond crystals. As a source of water, a mixture of Mg(OH) 2 and SiO 2 was used, which reacted under the experimental conditions following the reaction 2Mg(OH) 2 +SiO 2 =Mg 2 SiO 4 +2H 2 O. The main experiments were performed in the Ni 0.7 Fe 0.3 -C system at a pressure of 6 GPa, temperature of 1370 °C, duration of 15 hrs and H 2 O concentration (C H2O ) ranging from 0 to 0.5 wt.%. It is found that as H 2 O content increases from 0 to 0.2 wt.%, diamond morphology changes from bulky octahedra to {111} plate-like crystals and then to {111} dendrites. Further increases in C H2O in the range 0.22-0.4 wt.% result in crystallization of bulky rhombic dodecahedra and then {110} dendrites. At C H2O higher than approximately 0.43 wt.%, nucleation and growth of diamond are completely terminated and graphite only crystallizes. The systematic changes in diamond growth and morphology are accompanied by a decrease in nitrogen impurity concentration in diamond from

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“…5), which are probably formed from methyl (CH 3 ) radicals in a plasma decomposition process during diamond formation. Although the maximum coverage of COOH measured on (001), (111) or polycrystalline surface is no more than 10% (1 × 10 14 cm −2 ) 30, 31, it is sufficiently high for biomolecule immobilization to detect nucleic acids and proteins. At pH > 3, the carboxyl base is ionized to become COO − , which affects the subsequent biochemical reaction.…”

Section: Variety Of Surface Terminationsmentioning

confidence: 96%

Diamond electrolyte solution gate FETs for DNA and protein sensors using DNA/RNA aptamers

Kawarada

Ruslinda

2011

Physica Status Solidi (a)

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For DNA and protein detection, we have analyzed DNA/RNA immobilized biosensors based on diamond field effect transistors (FETs), where several types of atomic or molecule termination have been realized on their surfaces. Amine termination and carboxyl termination necessary for biomolecule immobilization can be formed directly on the diamond surfaces resulting in the immobilization of short DNA/RNA within 5 nm from the surface. Owing to the high areal capacitance of a liquid electric double layer capacitor and a solid channel capacitor, the change in the surface charge caused by the hybridization of DNA/RNA and the protein binding to DNA/RNA aptamers can be efficiently detected. The charge of surface termination groups such as NH þ 3 , O À , COO À affects the suppression of nonspecific binding. The detection of biomolecules such as one-base mismatch of DNA and proteins that is unaffected by nonspecific binding can be realized as a result.

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Higher coverage of carboxylic acid groups on oxidized single crystal diamond (001)

Cited by 49 publications

References 33 publications

Crystallization of HPHT diamond crystals in a floatage system under the influence of nitrogen and hydrogen simultaneously

Crystallization of HPHT diamond crystals in a floatage system under the influence of nitrogen and hydrogen simultaneously

Effect of H₂O on Diamond Crystal Growth in Metal–Carbon Systems

Diamond electrolyte solution gate FETs for DNA and protein sensors using DNA/RNA aptamers

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Higher coverage of carboxylic acid groups on oxidized single crystal diamond (001)

Cited by 49 publications

References 33 publications

Crystallization of HPHT diamond crystals in a floatage system under the influence of nitrogen and hydrogen simultaneously

Crystallization of HPHT diamond crystals in a floatage system under the influence of nitrogen and hydrogen simultaneously

Effect of H2O on Diamond Crystal Growth in Metal–Carbon Systems

Diamond electrolyte solution gate FETs for DNA and protein sensors using DNA/RNA aptamers

Contact Info

Product

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Effect of H₂O on Diamond Crystal Growth in Metal–Carbon Systems