Abstract
In order to study the properties of single-crystal boron-doped diamond electrodes for electroanalysis, (100) and (111) boron-doped homoepitaxial single-crystal and polycrystalline diamond thin films were deposited by means of microwave plasma-assisted chemical vapor deposition. Features in the cyclic voltammograms (CVs) for aqueous H2SO4 supporting electrolyte and Fe(CN)63-/4- in aqueous Na2SO4 for polycrystalline electrodes were dominated by behaviour typical of (111) single-crystal facets, rather than (100) facets. Apparent heterogeneous electron-transfer rate constants (k0) for various redox systems were estimated with CV simulation at polycrystalline, (111) and (100, off-axis, 4°). Based on comparison with the Marcus model, the behavior of the k0 values, except for that of Fe(CN)63-/4-, and indicates apparent outer-sphere electron-transfer, but with a lower density of states compared to glassy carbon or typical metal electrodes. The (111) homoepitaxial film performed better than a polycrystalline film in the cyclic voltammetric detection of serotonin, with signal-to-background ratios of 5 and 2, respectively. Single-crystal diamond may thus be an even more optimal electrode material for electroanalysis than polycrystalline diamond, which has been shown to have superior characteristics as an electrode material.
| Original language | English |
|---|---|
| Journal | Journal of the Electrochemical Society |
| Volume | 149 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2002 Jun |
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ASJC Scopus subject areas
- Electrochemistry
- Surfaces, Coatings and Films
- Surfaces and Interfaces
Cite this
Homoepitaxial single-crystal boron-doped diamond electrodes for electroanalysis. / Kondo, Takeshi; Einaga, Yasuaki; Sarada, Bulusu V.; Rao, Tata N.; Tryk, Donald A.; Fujishima, Akira.
In: Journal of the Electrochemical Society, Vol. 149, No. 6, 06.2002.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Homoepitaxial single-crystal boron-doped diamond electrodes for electroanalysis
AU - Kondo, Takeshi
AU - Einaga, Yasuaki
AU - Sarada, Bulusu V.
AU - Rao, Tata N.
AU - Tryk, Donald A.
AU - Fujishima, Akira
PY - 2002/6
Y1 - 2002/6
N2 - In order to study the properties of single-crystal boron-doped diamond electrodes for electroanalysis, (100) and (111) boron-doped homoepitaxial single-crystal and polycrystalline diamond thin films were deposited by means of microwave plasma-assisted chemical vapor deposition. Features in the cyclic voltammograms (CVs) for aqueous H2SO4 supporting electrolyte and Fe(CN)63-/4- in aqueous Na2SO4 for polycrystalline electrodes were dominated by behaviour typical of (111) single-crystal facets, rather than (100) facets. Apparent heterogeneous electron-transfer rate constants (k0) for various redox systems were estimated with CV simulation at polycrystalline, (111) and (100, off-axis, 4°). Based on comparison with the Marcus model, the behavior of the k0 values, except for that of Fe(CN)63-/4-, and indicates apparent outer-sphere electron-transfer, but with a lower density of states compared to glassy carbon or typical metal electrodes. The (111) homoepitaxial film performed better than a polycrystalline film in the cyclic voltammetric detection of serotonin, with signal-to-background ratios of 5 and 2, respectively. Single-crystal diamond may thus be an even more optimal electrode material for electroanalysis than polycrystalline diamond, which has been shown to have superior characteristics as an electrode material.
AB - In order to study the properties of single-crystal boron-doped diamond electrodes for electroanalysis, (100) and (111) boron-doped homoepitaxial single-crystal and polycrystalline diamond thin films were deposited by means of microwave plasma-assisted chemical vapor deposition. Features in the cyclic voltammograms (CVs) for aqueous H2SO4 supporting electrolyte and Fe(CN)63-/4- in aqueous Na2SO4 for polycrystalline electrodes were dominated by behaviour typical of (111) single-crystal facets, rather than (100) facets. Apparent heterogeneous electron-transfer rate constants (k0) for various redox systems were estimated with CV simulation at polycrystalline, (111) and (100, off-axis, 4°). Based on comparison with the Marcus model, the behavior of the k0 values, except for that of Fe(CN)63-/4-, and indicates apparent outer-sphere electron-transfer, but with a lower density of states compared to glassy carbon or typical metal electrodes. The (111) homoepitaxial film performed better than a polycrystalline film in the cyclic voltammetric detection of serotonin, with signal-to-background ratios of 5 and 2, respectively. Single-crystal diamond may thus be an even more optimal electrode material for electroanalysis than polycrystalline diamond, which has been shown to have superior characteristics as an electrode material.
UR - http://www.scopus.com/inward/record.url?scp=0036607273&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036607273&partnerID=8YFLogxK
U2 - 10.1149/1.1471548
DO - 10.1149/1.1471548
M3 - Article
AN - SCOPUS:0036607273
VL - 149
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 6
ER -