# 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 journalArticle

4 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 language English 8052490 7281-7289 9 IEEE Sensors Journal 17 22 https://doi.org/10.1109/JSEN.2017.2757701 Published - Nov 15 2017

### Fingerprint

pH sensors
Monitoring
sensors
Sensors
MOSFET devices
Tin oxides
Indium
Electric power utilization
Cameras
Calibration
Electrodes
field tests
metal oxide semiconductors
indium oxides
tin oxides
field effect transistors
cameras
electrodes
evaluation
sensitivity

### All Science Journal Classification (ASJC) codes

• Instrumentation
• Electrical and Electronic Engineering

### Cite this

Low-Power Highly Sensitive pH Sensor with $\mu$ dots Protective Structures for Monitoring Rumen in Cows in Real-Time. / Zhang, Lan; Lu, Jian; Okada, Hironao; Nogami, Hirofumi; Itoh, Toshihiro; Arai, Shozo.

In: IEEE Sensors Journal, Vol. 17, No. 22, 8052490, 15.11.2017, p. 7281-7289.

Research output: Contribution to journalArticle

Zhang, Lan ; Lu, Jian ; Okada, Hironao ; Nogami, Hirofumi ; Itoh, Toshihiro ; Arai, Shozo. / Low-Power Highly Sensitive pH Sensor with $\mu$ dots Protective Structures for Monitoring Rumen in Cows in Real-Time. In: IEEE Sensors Journal. 2017 ; Vol. 17, No. 22. pp. 7281-7289.
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