In this paper, authors propose a new method to fabricate metal nanodot array on a plastic film. This process comprises three steps; firstly, a substrate is deposited with metal. Then, a nanodot array is formed on the substrate surface by thermal dewetting. Finally, the nanodot array is transferred to a plastic film. Using the proposed method, gold nanodot array is fabricated on epoxy films. Furthermore, in this paper, the effects of process parameters such as annealing temperature, substrate material and plastic material on dot transfer ratio to a plastic film are studied. The mechanism of dot transfer from a substrate to a plastic film is also discussed in details. The transfer ratio increases as the annealing temperature is higher. Silicon substrate results slightly higher contact angle and transfer ratio than quartz glass substrate. Araldite rapid epoxy decreases transfer ratio while SpeciFix-20 epoxy increases transfer ratio when the annealing temperature is higher. Highest transfer ratios of 95% and 87% were achieved when transferring nanodot array from silicon substrate and quartz glass substrate to Araldite rapid epoxy film, respectively. Highest transfer ratio of 91% was achieved when transferring nanodot array from quartz glass substrate to SpeciFix-20 epoxy.
In this paper, authors report the effects of process parameters of thermal annealing method on the morphologyand Localized Surface Plasmon Resonance (LSPR) property of gold nanodots. Results show that the nanodots aggregated on a quartz glass substrate are large and sparse, while the nanodots aggregated on a silicon substrate are small and dense. The peak of the absorbance spectra is shifted to a longer wavelength and becomes broader when the gold film is thicker. The absorbance intensity increases with the increase in the gold film thickness. Increase the annealing temperature and/or the annealing time result in a blue shift of the absorbance peak and a decrease in the peak intensity. It is found that the variation in the absorbance peak wavelength and peak intensity closely correlates to the variation in the average circularity of the nanodots. This result suggests that the LSPR of nanodots can be tuned by controlling themorphology, specifically the circularity, of the nanodots.
In this paper, a chemical lift-off process using acetone ink was examined to attain the easy fabrication of metallic nano/microstructures. This process consists of five steps: cleaning of the substrate, chemical stamping, metal film deposition, coating with glue, and selective peeling. Details of the hot embossing process for the cycloolefin polymer (COP) film mold fabrication and the selection of the organic solvent ink for the chemical stamping are also explained. The fabrication of several kinds of metallic nano/microstructures, such as Au line and space structures, Au square film arrays, and Au dot arrays, is demonstrated. It is shown that metal films coated on the stamped region peeled off with the glue, and a metal film shaped in the stamp’s negative pattern remained on the substrate. Acetone is effective for reducing the surface energy of the substrate and the bonding strength, resulting in selective peeling of the coated metal film.
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