1. All InN/InGaN solid-state potentiometric chloride sensor with super Nernstian sensitivity
- Author
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Lingyun Xie, Hongjie Yin, Peng Wang, Guofu Zhou, and Richard Nötzel
- Subjects
010302 applied physics ,Aqueous solution ,Materials science ,business.industry ,Potentiometric titration ,General Engineering ,General Physics and Astronomy ,Linearity ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Epitaxy ,01 natural sciences ,Reference electrode ,Chloride ,0103 physical sciences ,medicine ,Optoelectronics ,Potentiometric sensor ,0210 nano-technology ,business ,Sensitivity (electronics) ,medicine.drug - Abstract
We demonstrate an all-solid-state potentiometric sensor constructed from solid-state InN/InGaN sensing- and reference electrodes with the epitaxial InN/InGaN layers directly grown on Si substrates. The sensor, evaluated in KCl aqueous solution, exhibits super-Nernstian sensitivity of −78 mV/decade with good linearity for concentrations of 0.01–1 M, which is the physiologically relevant range. Good stability and re-usability are demonstrated by a long-time drift below 0.2 mV h−1 and standard deviation of 8 mV for repeated measurements over 10 d. These properties fulfil the requirements for compact, robust and highly sensitive all-solid-state sensors and sensor arrays.
- Published
- 2020