| 摘要: | 研究期間：10208~10307;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. |
