Developing a Solid-State pH Sensor for Wagyu-Rumen Monitoring

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

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)


    We have developed a solid-type pH sensor for dairy wagyu-rumen measurements. The pH sensor is composed of a sensing electrode of indium tin oxide (ITO) film and a metal-oxide-semiconductor field-effect transistor (MOSFET). In the solid-state sensor structure, the ITO electrode is a separated gate of the FET and the ITO electrode can be patterned with a suitable capture structure for the wagyu-rumen environment. A sensor system with a compact size can be fabricated by eliminating the reference solution. The pH sensors have a sensitivity of 10-15 μA/pH under different sensing contact areas from 12 to 78 mm2. Long-term tests with interval experiments have been completed in 18 d, and the results demonstrate that the pH sensor has a stable performance for rumen pH measurements over a long time.

    Original languageEnglish
    Pages (from-to)1273-1281
    Number of pages9
    JournalSensors and Materials
    Issue number12
    Publication statusPublished - 2016

    All Science Journal Classification (ASJC) codes

    • Instrumentation
    • Materials Science(all)


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