{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T08:45:06Z","timestamp":1791794706863,"version":"4.3.4"},"reference-count":44,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T00:00:00Z","timestamp":1790812800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T00:00:00Z","timestamp":1790812800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>Silica nanostructures are attractive platforms for hybrid nanomaterials because of their chemical stability and versatile surface functionalization. Here, spherical SiO2 nanoparticles were synthesized by a modified St\u00f6ber method, functionalized with (3-aminopropyl)triethoxysilane (APTES), and decorated with gold nanoparticles (AuNPs) formed using an inorganic stabilization strategy involving OH\u2212 and Cl\u2212 ions, without conventional organic AuNP capping agents. Complementary characterization by Fourier-transform infrared spectroscopy (FTIR), ultraviolet\u2013visible diffuse reflectance spectroscopy (UV\u2013VIS DRS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) supported the sequential surface modification and formation of the SiO2\u2013APTES\u2013AuNPs hybrid material. TEM yielded average diameters of 100.81 \u00b1 1.74 nm for SiO2 nanoparticles (n = 50) and 2.00 \u00b1 0.31 nm for supported AuNPs (n = 80). Methylene blue (MB) was subsequently used for a proof-of-concept Raman evaluation. At 10\u22123 and 10\u22124 M MB, relative Raman signal-amplification ratios of approximately 7.5 and 3.5, respectively, were obtained from the integrated response near 1620 cm\u22121; these values are not conventional surface-enhanced Raman scattering (SERS) enhancement factors. At 10\u22126 M, a fluorescence-like background was observed without establishing metal-enhanced fluorescence. Density functional theory calculations using an Au32 cluster provided qualitative insight into local S\u00b7\u00b7\u00b7Au and \u03c0\u00b7\u00b7\u00b7Au interactions. Overall, these results establish an inorganic SiO2-AuNPs as a physicochemically characterized hybrid nanomaterial prepared through an inorganic AuNP-stabilization strategy and support its further investigation in Raman-based applications.<\/jats:p>","DOI":"10.3390\/nano16191243","type":"journal-article","created":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T18:43:24Z","timestamp":1790880204000},"page":"1243","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Inorganic-Ion-Stabilized Au Nanoparticles Supported on SiO2: Synthesis, Physicochemical Characterization, and Proof-of-Concept Raman Response Toward Methylene Blue"],"prefix":"10.3390","volume":"16","author":[{"given":"Jorge Luis Mendoza","family":"Tellez","sequence":"first","affiliation":[{"name":"Departamento de Qu\u00edmica, Universidad Aut\u00f3noma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, M\u00e9xico City 09340, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"software","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5477-7523","authenticated-orcid":false,"given":"Omar E.","family":"Uribe-Ju\u00e1rez","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica, Universidad Aut\u00f3noma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. 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