Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7138627 | Sensors and Actuators B: Chemical | 2018 | 49 Pages |
Abstract
This study aims to investigate the super Nernstian pH sensitivity of Ce2-xSrx(Zr0.53Ti0.47)Oy (CSZT) electrolyte-insulator-semiconductor (EIS) sensors with excess cerium content as a novel solid state device which can be used for detection of pH. We employed the X-ray diffraction, atomic force microscopy, X-ray photoelectron spectroscopy, and field-emission transmission electron microscopy to characterize the structural, morphological, chemical, and microstructural features, respectively, of these films as a function of the growth condition (strontium doping concentrations varied from 0, 5, 10, and 15%). The CSZT EIS device treated at the 10âmol% Sr condition exhibited the highest sensitivity of 93.15âmV/pH, the lowest hysteresis voltage of 1âmV, and the smallest drift rate of 0.32âmV/h among these conditions. This result may be attributed to the optimal Sr content in the CSZT creating a high content of Ce3+ ions, producing a higher surface roughness and forming the neutral oxygen vacancies.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Jim-Long Her, Sankar Prasad Bag, Prabir Garu, Bih-Show Lou, Tung-Ming Pan,