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SEM images demonstrating the shrinkage of the gaps between aligned PS beads upon microwave heating. The heating times were (a) 0 s, (b) 90 s, (c) 100 s, and (d) 110 s. The scale bar is 300 nm.
SEM images of Al nanostructures fabricated using nanosphere masks heated for (a) 0 s, (b) 90 s, (c) 100 s, and (d) 110 s. The deposition thickness was 30 nm. The scale bar is 300 nm.
(a) Extinction spectra of the Al nanostructures fabricated through PS masks with different heating times of 0 s, 90 s, 100 s, and 110 s, represented by solid lines. The spectra are normalized. The overlaid circular dots are the calculated extinction spectra of single Al nanostructures with sizes of 80 nm, 71 nm, 59 nm, and 50 nm. In the calculations, the shapes of the nanostructures were modeled as circular discs for the 50 nm and 59 nm-wide structures and as triangular discs for the 71 nm and 80 nm-wide structures, all with heights set at 30 nm. The black dashed line represents the calculated extinction spectrum for periodically aligned 80 nm nanostructures in a graphene pattern. An layer of 2 nm thickness was assumed. (b) LSPR peak wavelength vs. structure’s lateral size. Experimental data are plotted in the closed squares, with the error bars representing the standard deviation of the structure’s width. Theoretically calculated values are plotted in open circles.
Size, circularity, and LSPR wavelength of the nanostructures fabricated with different heating times.
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