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(a) Photographs of CNC iridescent solid films prepared with varying sonication times and their UV-Vis spectra; (b) optical photographs of CNC iridescent solid films prepared with varying CNC suspension volumes and their SEM images of the cross-sections, and a plot of film thickness as a function of CNC suspension volume; (c) photographs of CNC iridescent films prepared with various degrees of vacuum. Reproduced from [109].
