Nanostructures are defined as having at least one dimension between 1 nm and 100 nm. They have fascinating properties and potential applications. Is it hard to imagine the size of a nanometer? One nanometer is equivalent to one billionth of a meter (10-9 m). A sheet of paper is about 100,000 nanometers thick. One of the important nanostructures are one-dimensional nanowires that have high surface-to-volume ratio and unique characteristics to be integrated into micro/nanoscopic systems for electronic, optical and sensing applications. We use a simple and low-cost method, named nanoskiving, to fabricate high-aspect-ratio gold nanowires, which can be placed in the center of the channel in microfluidic devices. In this position the rate of flow is highest, so the gold nanowires are sensitive enough to sense the change of flow through the change in resistivity. Furthermore, DNA molecules can bind to the gold nanowires so that flow-elongating the DNA molecules can reach maximum even at low rates of flow. We also use the two gold nanowires to construct nanogaps that can achieve metal/insulator/metal tunneling junctions, which demonstrates that the current density through the junctions depends exponentially on the bias. In addition we obtain large electric enhancement as hot spots for reliable and reproducible SERS (Surface-enhanced Raman Scattering) spectroscopy. Furthermore, 3D nanogap grids are easily constructed by stacking nanogaps along the vertical direction.
|Qualification||Doctor of Philosophy|
|Place of Publication||[Groningen]|
|Publication status||Published - 2016|