substituted AzoGly with thiolated THF-soluble AzoSH (Figure ) and EtOH-soluble AzoSS (Figure ). Such or similar molecules have already been used to form SAMs on the surface of planar or nano Au. Nevertheless, the applied Azo change did not grant the desired synergy of components and compromised material properties (Figure and Figure ). Due to the heavy aggregation of the resulting composites (see Section 3.3. of SI), the as-prepared materials did not exhibit plasmonic or photochromic properties. Hydrophobic AzoSH and AzoSS prevent hybrids from dispersing in water, which causes aggregation, whereas more polar, protonated AzoGly forms with Au-CNFs entirely water-functional plasmonic-photochromic material. Hence, our protocol constitutes an important contribution to the already existing knowledge.