Advanced LSI-based amperometric sensor array with light-shielding structure for effective removal of photocurrent and mode selectable function for individual operation of 400 electrodes

Kumi Y. Inoue, Masahki Matsudaira, Masanori Nakano, Kosuke Ino, Chika Sakamoto, Yusuke Kanno, Reyushi Kubo, Ryota Kunikata, Atsushi Kira, Atsushi Suda, Ryota Tsurumi, Toshihito Shioya, Shinya Yoshida, Masanori Muroyama, Tomohiro Ishikawa, Hitoshi Shiku, Shiro Satoh, Masayoshi Esashi, Tomokazu Matsue

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

We have developed a large-scale integrated (LSI) complementary metal-oxide semiconductor (CMOS)-based amperometric sensor array system called "Bio-LSI" as a platform for electrochemical bio-imaging and multi-point biosensing with 400 measurement points. In this study, we newly developed a Bio-LSI chip with a light-shield structure and a mode-selectable function with the aim of extending the application range of Bio-LSI. The light shield created by the top metal layer of the LSI chip significantly reduces the noise generated by the photocurrent, whose value is less than 1% of the previous Bio-LSI without the light shield. The mode-selectable function enables the individual operation of 400 electrodes in off, electrometer, V1, and V2 mode. The off-mode cuts the electrode from the electric circuit. The electrometer-mode reads out the electrode potential. The V1-mode and the V2-mode set the selected sensor electrode at two different independent voltages and read out the current. We demonstrated the usefulness of the mode-selectable function. First, we displayed a dot picture based on the redox reactions of 2.0 mM ferrocenemethanol at 400 electrodes by applying two different independent voltages using the V1 and V2 modes. Second, we carried out a simultaneous detection of O2 and H2O2 using the V1 and V2 modes. Third, we used the off and V1 modes for the modification of the osmium-polyvinylpyridine gel polymer containing horseradish peroxidase (Os-HRP) at the selected electrodes, which act as sensors for H2O2. These results confirm that the advanced version of Bio-LSI is a promising tool that can be applied to a wide range of analytical fields.

Original languageEnglish
Pages (from-to)848-856
Number of pages9
JournalLab on a Chip
Volume15
Issue number3
DOIs
Publication statusPublished - 2015 Feb 7

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Chemistry(all)
  • Biomedical Engineering

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