| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 106 === The surface of the material with a high aspect ratio nano-rod array can change the physical properties of the component, thereby improving product performance, and can be applied to a wide range of applications such as inspection, optics, antireflection, and hydrophobic etc. Fabricate large area nano-rod structures with low cost, in this study, an anodized aluminum mold was firstly fabricated and transferred into a polymer mold and a metal nickel mold. The gas-assisted UV curing molding was used to reproduce the nano-rod structure, so that it could be mass-produced, and a high aspect ratio nano-rod was obtained by a simple and rapid method. Final that applications for SERS inspection, antireflection and hydrophobic.
First, through two-step anodization process nanostructure mold, AAO nanostructure were obtained using phosphoric acid and Oxalic acid as electrolyte. AAO templates with different pitches and pore diameter can be fabricated by changing the electrolyte、anodization voltage and the widening time.
The second method, uses the two-step transfer method of AAO mold to make the mold with the same structure. One is to make the polymer substrate through two gas-assisted hot pressing methods. The principle is to use two polymers with different Tgs. The second method is to make a nickel metal mold with higher mechanical strength through electroforming to ensure long-life.
Then, nano-rod array was fabricated by gas assisted casting of UV-curable resin and UV-curing. The maximum aspect ratio of 10.49 was obtained.
Finally, surface-enhanced Raman scattering (SERS)、reflectance and contact angle measurements were performed on the replicated products to verify the Raman enhancement factor(EF) and anti-reflection and hydrophobicity effects. The results showed that, for SERS experiment, the thin silver layer is sputtered on the nanostructured , we can test 4-Aminothiophenol(4-ATP) and Adenine that Raman spectrum, and the 180_AAO structure enhancement factor (EF) value is 2.69 × 106. For reflectance measure, the Nano rod structure all can be reduced to 1%, and the structure by 180 V AAO mold that reflectance can be reduced to 0.53%. For contact angle measure is all over 100°, which has the effect of hydrophobicity effect. Among them, the structure by 150 V AAO mold that contact angle is 107.7°. This research demonstrates the potential of gas assisted UV curing processes to make nanostructures in a fast, easy, and cost-effective manner.
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