| 摘要: | 本計畫擬利用三年，開發高性能電化學生化感測器。感測電極乃奈米催化顆粒與石墨烯的複合材料。研究中將以潔淨環保的超臨界流體析出所需的粒子。利用該流體低黏滯度、低表面張力，與高擴散係數等特性，可合成極細小且尺寸分佈集中的奈米顆粒，且其能均勻並緊密地附於石墨烯表面。石墨烯具有極高的表面積，高邊緣碳原子密度，以及良好的電子傳導性，非常適合作為催化顆粒之載體，並能有效傳遞電化學偵測反應的電荷訊號。利用以上新穎的電極材料設計與製備概念，預期能開發出高感度、高選擇性、快速反應、高可靠度，且經濟環保的新型生化感測器。具體而言，第一執行年度主要的目標為瞭解合成條件對石墨烯之材料特性的影響。並以超臨界流體技術於石墨烯上析出不同化學組成與尺寸的催化顆粒，研製複合電極材料。第二年度將深入探討所製作的各種電極在不同生化物質中的偵測反應機制。掌握石墨烯中影響電化學性能的關鍵因素，將其最佳化。另以超臨界流體製作各種合金型催化顆粒，以進一步提升電極感測性能。第三年度中將整合研發成果，針對不同的待測物質與環境，設計適當的感測電極，並提出專有的電化學感測方式與技術。另外，將積極與相關產業交流，期將研究成果具體應用化。This three-year research project aims at developing high-performance electrochemical biosensors with the electrodes composed of graphene and nano-sized catalyst particles. Supercritical fluid technique that is a green process is used to prepare the nanoparticles (NPs). The extremely low viscosity, near-zero surface tension, and high diffusivity of the fluid would cause a narrow size-distribution of the NPs, which are expected to be uniformly dispersed and tightly anchored on the graphene. The reasons of using graphene are based on their high surface area, high edged carbon density, and excellent electric conductivity. These characteristics make graphene an ideal supporting material for the NPs and also an effective electronic conductor that transmits the electrochemical signals (from the bio-sensing reactions). With the aforementioned novel composite electrode materials, the high sensitivity, good selectivity, fast response, great reliability, and superior environmental friendliness of the proposed electrochemical biosensors are expected. Specifically, the major task in the first year is to understand the effects of the synthesis conditions on the material properties of the prepared graphene. Moreover, supercritical fluid deposition technique will be employed to decorate graphene with various NPs with different chemical compositions and particle sizes. Fabrication of composite electrodes (with graphene/NPs) will be also achieved. In the second year, the reaction mechanisms of electrochemical bio-sensing processes (for various species) will be systematically investigated. Finding the key factors that determine the electrochemical performance of graphene is also an important object. Preparation of nano-sized catalyst alloys using supercritical fluid will be attempted, trying to further improve the electrode sensing performance. Based on the collected research results, specific biosensor electrodes will be proposed for individual sensing species in the final project year. According to the testing environments, particular electrochemical sensing modes will be adopted to optimize the detection sensitivity. With the established knowledge and techniques, we will look forward to cooperating with related industrials, aiming to put our experimental results into practice applications. 研究期間：10008 ~ 10107 |
