Surface modification of single-crystal boron-doped diamond electrodes for low background current

Pietzka, C.; Denisenko, Andrej; Kibler, Ludwig A.; Scharpf, Jochen; Men, Yakiv; Kohn, E.

doi:10.1016/j.diamond.2009.01.001

Cited by 11 publications

(9 citation statements)

References 12 publications

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“…The dependence of the space‐charge layer capacitance C SC versus the applied voltage V SC is

C_{SC} = \sqrt{\frac{q ϵ_{normalr} ϵ_{0} N_{normalA}}{2 (V_{SC} - ϕ_{normalB}) - \frac{k T}{q}}},

where q represents the elementary charge, ϵ 0 the dielectric constant of vacuum, ϵ r the relative dielectric constant of the material in use, N A is the doping density, ϕ B the band bending at equilibrium (no applied voltage), k the Boltzmann constant, and T the absolute temperature . The results from the investigations on hydrogen and oxygen‐terminated BDD electrode surfaces using this method have already been reported , thus representing a starting reference point for this study. Due to the better photovoltaic performances previously observed in the case of nitrogen surface terminated BDD and the expected implications for DSSC applications, the band diagram for this kind of termination needed to be determined.…”

Section: Methodsmentioning

confidence: 94%

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Investigation of diamond electrodes for photo‐electrochemistry

Bechter

Pietzka

Petkov

et al. 2014

Physica Status Solidi (a)

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Boron doped diamond (BDD) shows high chemical stability in contact with a liquid phase even under extreme pH conditions, high electrochemical activity, and allows very stable covalent functionalization on O-or N-terminated surfaces. It is therefore an excellent electrode material for many applications such as analytics, biosensors, and purification. Furthermore, the electrodes can be covalently functionalized with photosensitive dyes to generate photo currents. However, the energetic conditions and charge transfer mechanisms are not fully known and therefore have been investigated in this work. The focus was set on the energy band diagrams of nanocrystalline diamond (NCD) layers, especially on the flat-band potential V F and the band-bending w B in the space charge layer, for both O-and N-terminated surfaces, and the charge transfer mechanisms at the semiconductor/electrolyte phase-boundary, with or without electro-active organic dyes, such as manganese phthalocyanine. For this study NCD samples were grown by hot filament chemical vapor deposition (HFCVD) with a boron doping density N A ranging between 5.8 and 9.6 Â 10 20 cm À3 .The pristine surface was then processed by oxygen or ammonia plasma to modify the termination to O and NH 2 , respectively. After that a series of Mott-Schottky plots was measured for both terminations at several frequencies spanning from 3 Hz to 10 kHz and in two different electrolytes, namely 0.1 M H 2 SO 4 and 0.1 M KCl. The results showed nearly the same flat-band potential for both surface terminations, but a remarkable difference in the band-bending. The latter is most probably responsible for the better photoelectrical conversion observed in N-terminated NCD samples. The open-circuit potential (OCP) and chronoamperometric measurements performed after covalent functionalization of the samples with the color dyes revealed that only the N-terminated material delivered a measurable photocurrent. Although the global efficiency of the photoelectric conversion was low, these initial results show that by optimized selection of materials and modification technologies providing a proper match of the energy levels at all charge transfer steps, a higher energy output could be achieved.

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“…The dependence of the space‐charge layer capacitance C SC versus the applied voltage V SC is

C_{SC} = \sqrt{\frac{q ϵ_{normalr} ϵ_{0} N_{normalA}}{2 (V_{SC} - ϕ_{normalB}) - \frac{k T}{q}}},

Section: Methodsmentioning

confidence: 94%

“…To insulate the doped layer from the substrate, an undoped diamond layer was grown in between. The typical doping concentrations known from former experiments with similarly manufactured samples were around 10 20 cm −3 . After the growth the wafers were cut into squared pieces of 8 × 8 mm 2 .…”

Section: Methodsmentioning

confidence: 96%

Investigation of diamond electrodes for photo‐electrochemistry

Bechter

Pietzka

Petkov

et al. 2014

Physica Status Solidi (a)

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“…The spectra of diamond films deposited on pristine WC router bits shows the typical peaks of nanocrystalline diamond films. The diamond peak at 1332 cm -1 as characteristics peak of sp 3 hybridized carbon is relatively weak while the D clearance of G-band at 1580 cm -1 reveals a large proportion of sp 2 phased carbon from grain boundaries [16]- [21]. The peaks at 1140 cm -1 is attributed to C-H bonds.…”

Section: R Onmentioning

confidence: 95%

Effects of Surface Modification on Improvement of Diamond Coating on Tungsten Carbide Cutting Tool

Lin¹,

BenDao²,

Liou³

2016

IJMERR

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In our present work, surface modification techniques including Co removal and micro blasting were developed for CVD diamond film coating process on tungsten carbide router bit. Microwave plasma jet chemical vapor deposition system was employed to deposit diamond films onto the as-prepared WC router. Scanning Electron Microscopy (SEM) and Optical Microscopy (OM) were used to investigate the surface morphology of the samples. Raman spectroscopy and energy-dispersive X-ray spectroscopy (EDS) were used to analyzed the microstructure and fraction of the films. The result showed that the developed surface modification processes could significant improve the cutting performance and tool life as 220%. The above results indeed demonstrate a potential applications of diamond coating for cemented carbide tools.  Index Terms-diamond, tungsten carbide, chemical vapor deposition, cutting tool 168

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“…Multi-layers arrays were obtained by the deposition of conductive and non-conductive diamond on a solid substrate. 0.6 µm electrodes were obtained by etching with an oxygen/argon plasma process [43].…”

Section: Introductionmentioning

confidence: 99%

Boron doped diamond microelectrodes arrays for electrochemical detection in HPLC

Mahé

Devilliers

Dardoize

2015

Talanta

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To cite this version:Eric Mahé, Didier Devilliers, François Dardoize. Boron doped diamond microelectrodes arrays for electrochemical detection in HPLC. Talanta, Elsevier, 2015, 132, pp.641 -647 Highlights•Boron-doped diamond microelectrodes arrays have been used as sensors for HPLC.•These amperometric sensors have a good signal/noise ratio.•Spacing, disposition and number of the microelectrodes have been studied, as well as influence of flow velocity. AbstractBoron doped diamond microelectrodes arrays (MEA) have been prepared in order to be used as new

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Surface modification of single-crystal boron-doped diamond electrodes for low background current

Cited by 11 publications

References 12 publications

Investigation of diamond electrodes for photo‐electrochemistry

Investigation of diamond electrodes for photo‐electrochemistry

Effects of Surface Modification on Improvement of Diamond Coating on Tungsten Carbide Cutting Tool

Boron doped diamond microelectrodes arrays for electrochemical detection in HPLC

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