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. 2020 Apr 6;59(21):8293–8300. doi: 10.1002/anie.201916484

Figure 1.

Figure 1

The freeze–thaw‐directed fabrication of gold gels. a) Photographs of various stages of the freeze–thaw‐directed gelation process of the Au NP solutions (c M=0.5 mm) and the corresponding aerogels. Liquid nitrogen is used for freezing. b) SEM image and c) TEM images of the obtained gold aerogel. d) Time‐lapse UV/Vis absorption spectra of the original Au NP solution, and the solution after freezing for 5 min and thawing for different periods of time. e) TEM images of original Au NP solution (freezing for 0 s), and the solution after freezing for 15 s, 30 s, 45 s or 120 s followed by thawing for about 5 min.