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This deficiency has led to the emergence of a class of synthetic protocols, referred to as surfactant\u2010free syntheses, that mitigate these issues by using reagents that realize nanoparticle surfaces that are unencumbered by persistent shape\u2010directing agents. Polyol\u2010 and monoalcohol\u2010based growth solutions have proven highly effective in this regard; however, shape\u2010control in the absence of additives has proved elusive. Herein, a seed\u2010mediated photochemical synthesis is demonstrated that can form arrays of highly faceted gold nanoplates in a room\u2010temperature growth solution of HAuCl\n                    <jats:sub>4<\/jats:sub>\n                    , water, and a monoalcohol. Wavelength\u2010dependent characterization and first\u2010principles density functional theory (DFT) calculations provide insights into the photoredox and shape\u2010control mechanisms responsible for the unexpected emergence of nanoplates. It is demonstrated that the illumination of the growth solution is the key driver of nanoplate growth. DFT calculations indicate that two\u2010dimensional growth stems from the {111} surface\u2010selective co\u2010adsorption of the monoalcohols and chlorine. Taken together, this work establishes the viability of a shape\u2010controlled monoalcohol\u2010based synthesis and advances the mechanistic framework needed to direct nanometal growth trajectories along pathways yielding planar geometries.\n                  <\/jats:p>","DOI":"10.1002\/smtd.70731","type":"journal-article","created":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T09:59:41Z","timestamp":1779271181000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Monoalcohol\u2010Directed Shape Control in a Surfactant\u2010Free Gold Nanoplate Synthesis"],"prefix":"10.1002","volume":"10","author":[{"given":"Brendan D.","family":"Nieukirk","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry University of Notre Dame  Notre Dame Indiana 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