Structure and electrochemical properties of carbon films prepared by a electron cyclotron resonance sputtering method

Jianbo Jia, Dai Kato, Ryoji Kurita, Yukari Sato, Kenichi Maruyama, Koji Suzuki, Shigeru Hirono, Toshihiro Ando, Osamu Niwa

Research output: Contribution to journalArticle

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Abstract

This paper describes the characterization, electrochemical properties, and applications of carbon films prepared by the electron cyclotron resonance (ECR) sputtering method. The ECR-sputtered carbon film was deposited within several minutes at room temperature. The optimized sputtering conditions significantly change the film structure, which includes many more sp3 bonds (sp3/sp2 = 0.702) than previously reported film (sp 3/sp2 = 0.274)1 with an extremely flat surface (0.7 Å). The ECR-sputtered carbon films exhibit excellent electrochemical properties. For example, they have nearly the same potential window in the positive direction as that of high-qualify, boron-doped diamond (moderately doped, 1019-1020 boron atoms/cm3)2 and an even wider potential window in the negative direction with a low background current, high stability, and suppression of fouling by electroactive species without pretreatment. The electron-transfer rates at ECR-sputtered carbon films are similar to those of glassy carbon (GC) for Ru(NH 3)62+/3+ and Fe(CN)63-/4-, whereas they are much slower than those of GC for Fe2+/3+, dopamine oxidation, and O2 reduction due to weak interactions between electroactive species and the ECR-sputtered carbon film surface. Such a response can be attributed to the ultraflat surface and low surface O/C ratios of ECR-sputtered carbon films. ECR-sputtered carbon film is advantageous for measuring biochemicals with high oxidation potentials because of its wide potential window and high stability. Highly reproducible and well-defined cyclic voltammograms were obtained for histamine and azide ions with a peak potential at 1.25 and 1.12 V vs Ag/AgCl, respectively. The film is very stable for continuous voltammetry measurements in 10 μM bisphenol A, which usually fouls the electrode surface with oxidation products.

Original languageEnglish
Pages (from-to)98-105
Number of pages8
JournalAnalytical Chemistry
Volume79
Issue number1
DOIs
Publication statusPublished - 2007 Jan 1

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Electron cyclotron resonance
Carbon films
Electrochemical properties
Sputtering
Boron
Glassy carbon
Oxidation
Diamond
Azides
Voltammetry
Fouling
Histamine
Dopamine
Ions
Atoms
Electrodes
Electrons

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Structure and electrochemical properties of carbon films prepared by a electron cyclotron resonance sputtering method. / Jia, Jianbo; Kato, Dai; Kurita, Ryoji; Sato, Yukari; Maruyama, Kenichi; Suzuki, Koji; Hirono, Shigeru; Ando, Toshihiro; Niwa, Osamu.

In: Analytical Chemistry, Vol. 79, No. 1, 01.01.2007, p. 98-105.

Research output: Contribution to journalArticle

Jia, J, Kato, D, Kurita, R, Sato, Y, Maruyama, K, Suzuki, K, Hirono, S, Ando, T & Niwa, O 2007, 'Structure and electrochemical properties of carbon films prepared by a electron cyclotron resonance sputtering method', Analytical Chemistry, vol. 79, no. 1, pp. 98-105. https://doi.org/10.1021/ac0610558
Jia, Jianbo ; Kato, Dai ; Kurita, Ryoji ; Sato, Yukari ; Maruyama, Kenichi ; Suzuki, Koji ; Hirono, Shigeru ; Ando, Toshihiro ; Niwa, Osamu. / Structure and electrochemical properties of carbon films prepared by a electron cyclotron resonance sputtering method. In: Analytical Chemistry. 2007 ; Vol. 79, No. 1. pp. 98-105.
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