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

研究成果: Article査読

79 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)98-105
ページ数8
ジャーナルAnalytical chemistry
79
1
DOI
出版ステータスPublished - 2007 1 1

ASJC Scopus subject areas

  • 分析化学

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