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Influence of an integrated quasi-reference electrode on the stability of all-solid-state AlGaN/GaN based pH sensors
- Source :
- Journal of Applied Physics. 124:034904
- Publication Year :
- 2018
- Publisher :
- AIP Publishing, 2018.
-
Abstract
- An all-solid-state AlGaN/GaN based ion-sensitive heterostructure field effect transistor (ISHFET) pH sensor was fabricated by integrating a noble metal (Au) quasi-reference electrode to improve the device stability when measuring the pH value of a small aqueous volume. In this paper, the influence of the size of the quasi-reference electrode against the stability of the pH readings was investigated. Through optimizing the size of the integrated quasi-reference electrode, the all-solid-state ISHFET pH sensor can sustain stable pH measurements for aqueous solutions of micro-litre size. A sensitivity of 55 mV/pH was achieved by the pH sensor at room temperature. Thus, the device may have potential uses in biomedical applications which require small volume pH measurements.An all-solid-state AlGaN/GaN based ion-sensitive heterostructure field effect transistor (ISHFET) pH sensor was fabricated by integrating a noble metal (Au) quasi-reference electrode to improve the device stability when measuring the pH value of a small aqueous volume. In this paper, the influence of the size of the quasi-reference electrode against the stability of the pH readings was investigated. Through optimizing the size of the integrated quasi-reference electrode, the all-solid-state ISHFET pH sensor can sustain stable pH measurements for aqueous solutions of micro-litre size. A sensitivity of 55 mV/pH was achieved by the pH sensor at room temperature. Thus, the device may have potential uses in biomedical applications which require small volume pH measurements.
- Subjects :
- Aqueous solution
Materials science
business.industry
010401 analytical chemistry
Wide-bandgap semiconductor
General Physics and Astronomy
Heterojunction
02 engineering and technology
engineering.material
021001 nanoscience & nanotechnology
01 natural sciences
Reference electrode
0104 chemical sciences
Volume (thermodynamics)
Electrode
engineering
Optoelectronics
Field-effect transistor
Noble metal
0210 nano-technology
business
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 124
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........19efe57b227916bffc6d04528944c1fd