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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Small. 2017 Dec 18;14(18):e1703307. doi: 10.1002/smll.201703307

Figure 3. TEM images of bowtie structures with different gap-sizes.

Figure 3.

(a) TEM image of a typical bowtie structure with an ultra-small nanogap. (b-d) Close-up TEM images of bowtie structure with 0.5-nm (b), 1.5-nm (c), and 2.2-nm (d) nanogaps.