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Article Abstract
Glucose detection is crucial for diagnosis, prevention and treatment of diabetes mellitus. In this work, 10 nm AlO thin film was introduced on the channel of diamond solution-gate field-effect transistor (SGFET) to improve the performance of glucose detection. AFM results show the roughness of channel surface increased after AlO thin film deposition. Then, 1-pyrenebutyric acid-N-hydroxy succinimide ester (Pyr-NHS) and glucose oxidase (GOD) were linked on the channel. The morphology after each modification step was evaluated by SEM, and the result indicated an uneven AlO distribution. XPS spectra further confirmed the effective modification of Pyr-NHS and GOD. In addition, the shifts of transfer characteristics for each concentration of glucose were analyzed, which illustrated a wide linear response (10-10 M), a high sensitivity (-44.01 mV/log[glucose concentration]) and a low detection limitation (10 M). All these results show an excellent detection performance, which may provide a new idea for the design of diamond SGFET biosensor.
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| http://dx.doi.org/10.1016/j.talanta.2025.127560 | DOI Listing |
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