Charge Accumulation Type Hydrogen Ion Image Sensor with High pH Resolution

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概要

• 論文の詳細を見る

• We propose a charge transfer type ion image sensor operated using a charge accumulation technique that accumulates the output signal and integrates it temporally. This technique is expected to image hydrogen ion distributions with a high signal-to-noise (S/N) ratio. The sensor was fabricated using large-scale integration technology, so that its size was very compact, and its specialized charge transfer characteristics allowed it to amplify the signal without any external amplification. The sensor noise was independent of the sensing area size, and the noise power was determined by the noise of the source follower circuit. In 5 accumulation cycles, the S/N ratio increased by $\sqrt{5}$ times and the pH-referred noise, which indicates the pH sensor resolution, was reduced from 0.09 to 0.06 pH. The sensor effectively obtained a real-time image of the hydrogen ion distribution in a solution with a resolution of pH 0.1, which would not be possible without charge accumulation.

• 2011-02-25

著者

• Ishida Makoto

  Department Of Applied Chemistry & Biochemistry Faculty Of Engineering Kumamoto University

• Sawada Kazuaki

  Department Of Electrical And Electronic Engineering Toyohashi University Of Technology

• Sawada Kazuaki

  Department of Electronic and Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan

• Ishida Makoto

  Department of Electronic and Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan

• Takenaga Shoko

  Department of Electronic and Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan

• Tamai Yui

  Department of Electronic and Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan

• Takenaga Shoko

  Department of Electrical and Electronic Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan

• Sawada Kazuaki

  Department of Electric and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan

• Tamai Yui

  Department of Electrical and Electronic Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan

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