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Regularity breaking has been challenging in the chemical synthesis of nanoparticles. Most reported chemical methods for synthesizing irregular nanoparticles are complicated and laborious, largely hindering the exploration of structural irregularity in nanoscience. In this study, the authors have combined seed\u2010mediated growth and Pt(IV)\u2010induced etching to synthesize two types of unprecedented Au nanoparticles, bitten nanospheres and nanodecahedrons, with size control. Each nanoparticle has an irregular cavity on it. They exhibit distinct single\u2010particle chiroptical responses. Perfect Au nanospheres and nanorods without any cavity do not show optical chirality, which demonstrates that the geometrical structure of the bitten opening plays a decisive role in the generation of chiroptical responses.<\/jats:p>","DOI":"10.1002\/smll.202301476","type":"journal-article","created":{"date-parts":[[2023,3,23]],"date-time":"2023-03-23T03:16:59Z","timestamp":1679541419000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Synthesis of Bitten Gold Nanoparticles with Single\u2010Particle Chiroptical Responses"],"prefix":"10.1002","volume":"19","author":[{"given":"Han","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Zhejiang Sci\u2010Tech University  Hangzhou 310018 P. R. China"},{"name":"Department of Physics The Chinese University of Hong Kong  Shatin Hong Kong SAR 999077 P. R. 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