| Summary: | 碩士 === 國立中興大學 === 材料科學與工程學系所 === 105 === This study focuses on the non-enzymatic glucose sensing and the deposition of Cu-Co bimetallic nanoparticles on titanium nitride (TiN) electrodes. The sensitivity of non-enzymatic glucose sensing was promoted by Cu-Co nanoparticles with bifunctional properties. The TiN thin films were deposited by DC unbalanced magnetron reactive sputtering. We discuss effect of the films with different surface morphologies and resistivity by varying the deposition parameters. Then, the Cu-Co nanoparticles were influenced by electrode properties, and compared to their different shapes and sizes for the non-enzymatic glucose sensing. To compare the ratio of CuSO4/CoSO4 solution on Cu-Co nanoparticles and the non-enzymatic glucose sensing, we changed the concentration of CuSO4/CoSO4 solution into different ratio.
The comparison between the different morphologies/different resistivity TiN and the different morphologies/similar resistivity TiN, including high resistivity pyramidal (PHR-TiN), low resistivity granular (GLR-TiN), and pyramidal (P-TiN), granular (G-TiN) structures, respectively. No matter what the solution concentration ratio of CuSO4/CoSO4 is, the Cu-Co nanoparticles were deposited not only on the different morphologies/different resistivity TiN but also the different morphologies/similar resistivity TiN under a potentiostatic mode with -1 V and an applied time with 30 s. The current density of the granular TiN was higher than the pyramidal one, and the current density can be expressed as the reaction rate. It might be the granular TiN with more flat surface so that would have more nucleation sites. The nanoparticles on pyramidal TiN are between the two pyramids with less nucleation sites. The result indicates that the growth of Cu-Co nanoparticles with more influence on the surface morphology of TiN than resistivity.
We investigated the effect of non-enzymatic glucose sensing with different Cu-Co nanoparticles and the content ratio of Cu and Co by changing the concentration of CuSO4/CoSO4 solution. According to the experiment results, the morphologies of TiN are the main factor to cause the different type of morphologies of Cu-Co nanoparticles and the sensitivity of glucose sensing. When the solution concentration [Cu/(Cu+Co)]sol. was 0.5, the sensitivity of glucose sensing was the best. The Cu-Co nanoparticle sizes and the sensitivities of glucose sensing were 43±23 nm/1473±23 μA/cm2․mM for pyramidal TiN (P-TiN) and 50±14 nm/1646±64 μA/cm2․mM for granular TiN (G-TiN). In this study, Cu nanoparticle sizes were 97±30 nm and sensitivities of glucose sensing were 767±39 μA/cm2․mM. As the results, the Cu-Co nanoparticles sensitivities of glucose sensing were better than the Cu nanoparticles, and the bimetallic nanoparticles can promote the sensitivities of glucose sensing.
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