Improving the Drift Effect and Hysteresis Effect of Urea Biosensor Based on Graphene Oxide/Nickel Oxide Sensing Film Modified Either by Au Nanoparticles or <italic>γ</italic>-Fe₂O₃ Nanoparticles Using Back-End Calibration Circuit
From our other works, we have developed urea biosensor based on graphene oxide/nickel oxide sensing film modified either by Au nanoparticles or <inline-formula> <tex-math notation="LaTeX">${\gamma }$ </tex-math></inline-formula>-Fe<sub>2</sub>O<sub>...
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| Autores principales: | , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
IEEE
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/8ef61961c3ba4f8794e9d022b8e64ab7 |
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| Sumario: | From our other works, we have developed urea biosensor based on graphene oxide/nickel oxide sensing film modified either by Au nanoparticles or <inline-formula> <tex-math notation="LaTeX">${\gamma }$ </tex-math></inline-formula>-Fe<sub>2</sub>O<sub>3</sub> nanoparticles. In this study, we have further developed back-end calibration circuit to reduce the drift effect and hysteresis effect of the two types of the urea biosensors. The back-end calibration circuit is composed of non-inverting amplifiers, error amplifiers, P-MOSFET transmission transistor, feedback networks, output voltage capacitors and resistor dividers. After applying the back-end calibration circuit, the drift rate of urea biosensor modified by Au NPs is reduced from 3.06 mV/hr to 0.28 mV/hr, which is 90.85% reduction. The drift rate of urea biosensor modified by <inline-formula> <tex-math notation="LaTeX">${\gamma }$ </tex-math></inline-formula>-Fe<sub>2</sub>O<sub>3</sub> NPs is reduced from 3.92 mV/hr to 0.57 mV/hr, which is 85.46% reduction. Through the back-end calibration circuit to reduce the hysteresis effect, the hysteresis voltage for the forward cycle and reverse cycle of the urea biosensor modified by Au NPs are reduced by 26% and 30%, respectively. The hysteresis voltage for the forward cycle and reverse cycle of the urea biosensor modified by <inline-formula> <tex-math notation="LaTeX">${\gamma }$ </tex-math></inline-formula>-Fe<sub>2</sub>O<sub>3</sub> NPs are reduced by 23% and 28%, respectively. |
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