Low-Power Highly Sensitive pH Sensor with $\mu$ dots Protective Structures for Monitoring Rumen in Cows in Real-Time

Lan Zhang, Jian Lu, Hironao Okada, Hirofumi Nogami, Toshihiro Itoh, Shozo Arai

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    In this paper, we describe the development of a solid-type pH sensor with an ultra-low power consumption of 8.2× 10-4 mAh per measurement and a reasonably high accuracy of 0.1 pH for the real-time monitoring of the rumen of a cow. The sensor combines a metal-oxide-semiconductor field-effect transistor with a separate gate as the sensing electrode, and was fabricated using indium tin oxide with an optimized capture structure that incorporates protective micro-fabricated dots. The evaluation results show that the sensor has high-sensitivity of > 14 μA/pH, and maintains a stable baseline at pH 7 over the course of several days in the rumen. We performed a comprehensive calibration of the solid pH sensor, and carried out a field test, which clearly demonstrated that the pH values are strongly dependent on the activities of the cow, as recorded by a camera. The developed pH sensor is believed to be of significance for preventing disease, as well as for improving the efficiency of food production.

    Original languageEnglish
    Article number8052490
    Pages (from-to)7281-7289
    Number of pages9
    JournalIEEE Sensors Journal
    Volume17
    Issue number22
    DOIs
    Publication statusPublished - Nov 15 2017

    All Science Journal Classification (ASJC) codes

    • Instrumentation
    • Electrical and Electronic Engineering

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