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In this research, densely\u2010packed thin films containing a mixture of gold nanoparticles with two different sizes are fabricated and evaluated about their surface\u2010enhanced Raman scattering properties. The enhancement efficiency of gold nanoparticle films with different sizes is lower than that of single\u2010sized gold nanoparticle films. This tendency suggests a relationship between Raman scattering enhancement efficiency and the electric field generated by localized surface plasmon resonance among gold nanoparticles of different sizes.<\/jats:p>","DOI":"10.1002\/cphc.202500250","type":"journal-article","created":{"date-parts":[[2025,7,21]],"date-time":"2025-07-21T19:33:37Z","timestamp":1753126417000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Surface\u2010Enhanced Raman Scattering Properties of Densely\u2010Packed Thin\u2010Films Fabricated using Mixed Gold Nanoparticles with Different Diameters"],"prefix":"10.1002","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0741-3038","authenticated-orcid":false,"given":"Natsuki","family":"Koyama","sequence":"first","affiliation":[{"name":"Division of Advanced Engineering Science Graduate School of Engineering The University of Shiga Prefecture  2500, Hassaka Hikone Shiga 522\u20108533 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