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The first step of sonication was conducted in a modified ultrasonic cleaner equipped with a dummy beaker to absorb excess energy from the adjacent transducer and a reaction beaker for the reduction process. Lower sonication energy settings (frequency = 37 kHz, Pacoustic = 30%) enable more predictable and controlled surface plasmon resonance (SPR) in solution by avoiding the purple-to-blue color associated with the larger AuNP size. Hence, the emergence of a light-purple reaction mixture in the first step indicates the optimal time to transfer the solution to a water bath for subsequent heating in the second step. The resulting AuNPs typically exhibit a red wine color (\u03bb = 515\u2013525 nm). Among the systems evaluated, the ternary AuNPs-TEA-\u03b3CD system yielded the smallest nanoparticles, high stability, and noninclusion interactions between TEA and \u03b3CD, as evidenced by FT-IR and 2D-ROESY. More importantly, observation of AuNPs-TEA exhibited completely different SPR responses if subjected to only one step of the procedure. This procedure demonstrates high repeatability in producing smaller and more predictable aminated gold nanoparticles from the reactants used.<\/jats:p>","DOI":"10.1021\/acsomega.6c07140","type":"journal-article","created":{"date-parts":[[2026,9,14]],"date-time":"2026-09-14T06:01:32Z","timestamp":1789365692000},"page":"57885-57894","source":"Crossref","is-referenced-by-count":0,"title":["Facile Two-Step\nSize-Controlled Synthesis of Gold\nNanoparticles Functionalized with Triethylamine-Cyclodextrins"],"prefix":"10.1021","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4942-3410","authenticated-orcid":true,"given":"Annisa Indah","family":"Reza","sequence":"first","affiliation":[{"name":"Kawasan Sains dan Teknologi (KST) B.J. 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