| Summary: | 碩士 === 國立清華大學 === 動力機械工程學系 === 101 === In this research, a hybrid electrode with three-dimensional nanostructures has been developed, fabricated, and characterized. The nanogold and graphene were assembled on electrodes by electrodeposition to form three-dimensional nanostructures that increased surface area of working electrodes. Finally, microfluidic chips with the developed electrodes have been applied for sensing of dopamine at low concentrations.
In this research, the deposition parameters of nanogold and graphene, such as voltage, frequency, time, and surfactant, have been investigated and optimized systematically. The developed technology takes advantage of porous nanostructures, which are formed by gold nanoparticles. Then, graphene are deposited layer by layer on the gold nanoparticles to make the hybrid electrodes. By the measurements of surface morphology, thickness, electric property, resistance, and adherence, we can prove that the gold-graphene hybrid electrode has better characteristics than pure nanogold electrode and pure graphene electrode.
According to the experimental results, the sensing currents increase about 70 times, because the surface area of nanogold deposited electrode substantial increase by the fabricated three-dimensional nanostructures. In dopamine detection, due to π-π interaction between phenyl structure of dopamine and two-dimensional planar hexagonal carbon structure of graphene, dopamine can be captured on the electrode surface. In addition, the sensing results of gold-graphene hybrid electrode are better than the graphene electrode due to the increased surface area. The limit of detection is 2 ppb, and linear range is 2 to 20 ppb.
The gold-graphene hybrid electrode has larger working surface area by formation of three-dimensional nanostructures. In future, the developed technology could be applied to fuel cells and supercapacitors.
|
|---|
