Study the Strain-effect of Epitaxial Graphene Nanowalls on the Performance of Glucose Sensing
| Autor: | Wei-hsun Yang, 楊為勛 |
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| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 In this work, few-layer epitaxial graphene nanowall (EGNW) arrays, a 3D wall-like edge-oriented hetero-architecture consisting of few-layer graphene grown on silicon carbide, by microwave plasma-enhanced chemical vapor deposition (MPECVD), with different strain effect by tuning different H2/CH4 ratio during process, were demonstrated by Raman spectroscopy. This material was employed for glucose sensing due to its larger surface area, controllable layer number and highly graphitic nature of epitaxially grown graphene, and enhanced edges of nanowall-architecture. The work showed that the enzyme-modified EGNW electrode could provide a remarkably improved contact (ks= 5.43 ± 0.31s-1) with the glucose oxidase (GOD). In the glucose analysis, the GOD/EGNWs has a sensitivity of 41.09 ± 0.23μA/mM/cm2, a largest detection range from 2 pM to 5mM, and a glucose affinity of 0.291 ± 0.018 mM. Furthermore, the strain effect of EGNWs for glucose sensing could be observed by not only in charge transfer between GOD and EGNWs but also in glucose sensing. The tensile strain EGNWs shows much better electronic transport, sensitivity, and glucose affinity than the other materials. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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