| Summary: | 碩士 === 國立臺灣科技大學 === 光電工程研究所 === 105 === In this study, we report nickel (Ni) foam based non-enzymatic glucose sensors with graphene (G) and nickel hydroxide Ni(OH)2 as modifiers. The G/Ni foam was synthesized using chemical vapor deposition (CVD) process and two different routes were devised in the preparation of G/Ni(OH)2/Ni foam such as electroplating and hydrothermal methods. All the samples were then fabricated and used as working electrodes to measure various glucose concentrations. Thus, the results depict that best sensitivity was observed for electroplating based Ni(OH)2 foam exhibits the sensitivity of 11843.2 μAmM-1cm-2 and the LOD is 660.4 nM. While the hydrothermal based Ni(OH)2 foam which is 16799.6 μAmM-1cm-2 and the LOD is 624.7 nM.
On the other hand, the addition of graphene into Ni(OH)2 foam enhances the conductivity and surface area of all samples. Thus, the best sensitivity of electroplating based G/Ni(OH)2 gives 16769.2 μAmM-1cm-2 , LOD is 609.3 nM, and the increasing ratio of sensitivity is 16.26 %. Whereas the hydrothermal based G/Ni(OH)2 is 17333.2 μAmM-1cm-2 , LOD is 686.5 nM, and the increasing ratio of sensitivity is 3.17 %.
Furthermore, different kinds of LEDs (blue and green) were used to optimize the sensitivity of G/Ni(OH)2 based non-enzymatic glucose sensors. Among them, glucose sensors (both Ni(OH)2 and G/Ni(OH)2 foam) under blue LED shows striking improvement in sensitivity. It is because the electron transportation is increased in the presence of blue LED, and thereby increases the reaction of Ni(OH)2 and glucose, which also enhances the sensitivity. The best sensitivity of electroplating based Ni(OH)2 gives 12663.2 μAmM-1cm-2, LOD is 437.8 nM, and the increasing ratio of sensitivity is 6.92 %. Whereas the hydrothermal based Ni(OH)2 is 17323.2 μAmM-1cm-2 , LOD is 241.8 nM, and the increasing ratio of sensitivity is 3.11 %. The best sensitivity of electroplating based G/Ni(OH)2 gives 14136.4 μAmM-1cm-2 , LOD is 582.4 nM, and the increasing ratio of sensitivity is 2.67 %. Whereas the hydrothermal based G/Ni(OH)2 is 17931.2 μAmM-1cm-2 , LOD is 232.3 nM, and the increasing ratio of sensitivity is 3.45 %.
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