Nanomaterials最新文献

{"title":"A Review on the Recent Developments and Perspectives of Copper-Based Nanoparticles for the Electrochemical Reduction of NO_x and CO_x.","authors":"M R Rosales-Martínez, M A Hernández-Pérez, Patricia Maldonado-Altamirano, Claudia Camacho-Zuñiga, E Ramírez-Meneses, A Manzo-Robledo","doi":"10.3390/nano16191253","DOIUrl":"10.3390/nano16191253","url":null,"abstract":"<p><p>Anthropogenic emissions of carbon oxides (CO_x) and nitrogen oxides (NO_x) arising from industrial activities contribute to environmental and health problems, motivating the development of effective strategies for their mitigation and valorization. Among the available approaches, electrochemical reduction offers the additional possibility of converting CO_x and NO_x species into value-added products that may serve as chemical feedstocks or energy carriers, thereby contributing to carbon and nitrogen resource recovery. However, the practical development of these processes requires catalysts with high activity, selectivity, and stability, supported by synthesis strategies capable of controlling their active structures. Several metals, including Ir, Pt, Rh, Ru, Pd, Ni, Ag, Au, and Cu, have been investigated for the electrochemical reduction of CO_x and NO_x in aqueous media. Among them, Cu is particularly attractive because of its relatively high abundance, tunable oxidation states, and ability to catalyze both reaction families. This review examines Cu-based nanomaterials prepared through different synthesis strategies and analyzes how composition, oxidation state, morphology, exposed facets, defects, alloying, and interfacial structure influence CO_x and NO_x electroreduction. By comparing both reaction families, the review identifies shared structure-active-site-performance relationships together with reaction-specific requirements for intermediate stabilization and product formation. Particular attention is given to in situ and operando evidence showing that Cu-based catalysts may reconstruct under electrochemical conditions, so that the catalytically relevant material can differ from the as-synthesized structure. These insights support catalyst optimization with mechanistically informed design of dynamic Cu-based interfaces for selective CO_x and NO_x electroreduction.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13667226/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149183263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal Evolution of Silicon and Fluorine Species in Fluorosilane-Modified Carbon Aerogel Composites.","authors":"Yiren Long, Junzong Feng, Yonggang Jiang, Yijie Hu, Jian Feng","doi":"10.3390/nano16191250","DOIUrl":"10.3390/nano16191250","url":null,"abstract":"<p><p>Carbon aerogels are widely used for thermal protection in extreme high-temperature environments under inert atmospheres because of their excellent thermal insulation. However, their high specific surface area and open-pore structure promote moisture uptake, necessitating hydrophobic or low-surface-energy functionalization for practical use. Existing studies have primarily focused on room-temperature wettability after modification, while the high-temperature decomposition of functional layers, elemental evolution, and volatile release remain insufficiently understood. Herein, vapor-phase fluorosilane (FAS)-modified carbon aerogel composites were investigated by combining solid-state chemical characterization with evolved-gas analysis to clarify the thermal evolution of the functional layer under inert high-temperature conditions. FAS modification produced a superhydrophobic surface with an initial water contact angle of approximately 163°. During heating, the FAS-derived functional layer entered a rapid-decomposition stage at approximately 372 °C, followed by the principal fluorinated-volatilization stage near 443 °C. Perfluoroalkyl-chain cleavage progressively removed fluorine from the material through the release of C_xF_y-containing volatile species, accompanied by the disappearance of C-F, CF₂, and CF₃ structures. In contrast, part of the silicon-containing fraction was retained and evolved into a Si-C-related residual structure. Although high-temperature exposure eliminated FAS-derived hydrophobicity, the nanoparticle-assembled nanoporous carbon framework remained intact without obvious structural collapse. These findings establish a selective thermal-failure pathway in which fluorinated chains preferentially decompose and volatilize, whereas silicon-containing species are partially retained and reconstructed on the carbon framework, clarifying the failure mechanism of surface-modified carbon aerogel nanomaterials in extreme thermal environments.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13667006/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149183054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural, Aromatic, Optical and Reactive Features of C₁₂-(CO)<i>_n</i> (<i>n</i> = 2, 4, 6): A DFT Study.","authors":"Xin Chen, Pei-Pei Li, Guang-Nian Xu","doi":"10.3390/nano16191254","DOIUrl":"10.3390/nano16191254","url":null,"abstract":"<p><p>The geometric, electronic, spectroscopic, adsorption, and reactive properties of C₁₂-(CO)<i>_n</i> (<i>n</i> = 2, 4, 6) were systematically investigated using density functional theory at the ωB97XD/def2-TZVP level. All three molecules adopt planar structures with pronounced bond length alternation along the C₁₂ skeleton. Multi-index bonding analyses reveal significant π-electron localization at short C-C bonds rather than full-ring delocalization. As the number of OCCO fusion units increases, molecular symmetry evolves from <i>C</i>_2<i>v</i> to <i>D</i>_2<i>h</i> and further to <i>D</i>_3<i>h</i>. Aromaticity assessments using AV1245, HOMA, FLU-π, and ELF-π consistently indicate the absence of global aromaticity; OCCO fusion primarily disrupts π_in delocalization while leaving π_out conjugation comparatively less affected. Simulated UV-Vis spectra show that increasing OCCO units shifts the dominant absorption band toward the ultraviolet region, with low-energy excitations confirmed as locally excited states dominated by charge redistribution within the C₁₂ ring. vdW potential calculations disclose an anomalous adsorption strength sequence for light noble gases (He > Ne), and it is contrary to the counterpoise-corrected interaction energy results. Local electron attachment energy (LEAE) and orbital-weighted dual descriptor (OWDD) jointly demonstrate that the intrinsic electron-accepting reactivity follows C₁₂-(CO)₆ > C₁₂-(CO)₄ > C₁₂-(CO)₂, qualitatively consistent with LUMO energy lowering yet modulated by electron-attachment relaxation effects. This work provides theoretical insights into the structure-bonding-reactivity relationships of OCCO-fused carbon macrocyclic systems.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13666625/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149183035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on Photoelectric Properties and Applications of Nanostructured Materials.","authors":"Yunqing Tang, Bing Yang, Yanfang Zhao, Ping Yang","doi":"10.3390/nano16191252","DOIUrl":"10.3390/nano16191252","url":null,"abstract":"<p><p>Nanostructured materials offer many ways to tailor light absorption, charge transport, and light emission because these responses are sensitive to composition, dimensionality, and local structure [...].</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13667114/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149183051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solution-Shearing Self-Assembly of Hydrothermally Synthesized Tellurium Nanowires for Fabricating Field-Effect Transistors with Wafer-Scale Uniformity.","authors":"Hao Yang, Mose Park, Yanjin Tang, Hyun-Dong Lee, Ji-Won Kang, Zhiyi Lyu, Hoo-Jeong Lee","doi":"10.3390/nano16191251","DOIUrl":"10.3390/nano16191251","url":null,"abstract":"<p><p>Tellurium nanowires (TeNWs), a typical p-type semiconductor, have attracted significant attention in field-effect transistors (FETs) due to their narrow bandgap and high carrier mobility properties. However, fabricating large-area electronic devices with uniform performance remains a major challenge. In this study, we report a facile solution-shearing self-assembling strategy for fabricating TeNW-FETs with high-performance and uniformity. The solution-shearing process occurs at the interface during relative motion between the substrate and TeNW dispersion, enabling the TeNWs to reorient and adhere to the substrate, forming a uniform nanowire network. The transfer characteristics of TeNW-FETs reveal highly uniform electrical performance, and FET performance is strongly modulated by dispersion concentrations. Moreover, we investigated the impact of the solution-shearing direction on the device performance. The effective field-effect mobility of FETs with channels perpendicular to the substrate movement direction was approximately 12.1% lower than that of FETs with channels parallel to the movement direction. To further demonstrate scalability, we fabricated transistor arrays containing 324 individual FETs on a 4-inch Si/SiO₂ wafer, achieving 100% functional device yield and good performance uniformity. The devices exhibited an average I_ON/OFF ratio of 6.9 × 10², mobility (μ_eff) of 24.3 cm² V^-1 s^-1, subthreshold swing (SS) of 7.9 V dec^-1 and threshold voltage (V_TH) of 12.0 V.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13667251/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149182961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ag-Embedded Laser-Induced Graphene as a Catalyst for the Oxygen Reduction Reaction in Alkaline Media.","authors":"Valentina Semenova, Sergey Pavlov, Alina Inozemtseva, Sergey Kislenko","doi":"10.3390/nano16191246","DOIUrl":"10.3390/nano16191246","url":null,"abstract":"<p><p>Oxygen reduction reaction (ORR) is a critical process in fuel cells, yet its slow kinetics necessitates efficient and cost-effective catalysts. Anion exchange membrane fuel cells (AEMFCs) offer a promising platform for ORR electrocatalysis, as the alkaline environment enables the use of non-precious metals and carbonaceous materials. Herein, we utilize a simple, solid-state, reagent-free, and one-step synthesis of silver nanoparticle-decorated laser-induced graphene (Ag@LIG) via direct CO₂ laser writing on a polyimide film coated with an edible silver leaf. The laser treatment simultaneously converts the polymer into a porous three-dimensional graphene network and incorporates metallic silver nanoparticles (∼5-50 nm) into the carbon matrix. X-ray photoelectron spectroscopy confirms the metallic nature of the incorporated silver and reveals a higher nitrogen content in Ag@LIG than in pristine LIG, with pyrrolic nitrogen as the dominant configuration. Electrochemical characterization demonstrates that Ag@LIG exhibits enhanced ORR activity compared to pristine LIG, with a ∼30 mV positive shift in onset potential and a predominantly four-electron pathway over the entire potential range, with low peroxide formation. This work highlights the potential of the solid-state laser approach for producing Ag-carbon hybrid electrocatalysts with promising ORR performance for alkaline fuel cells.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13666643/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149183309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconfigurable Optoelectronic Logic Gates Enabled by a VSe₂/MoTe₂ van der Waals Heterojunction.","authors":"Kang Zhang, Wansong He, Ruya Cong, Xin Zhang, Jianzhi Gao, Yubing Tu, Suofu Wang, Mingsheng Long","doi":"10.3390/nano16191247","DOIUrl":"10.3390/nano16191247","url":null,"abstract":"<p><p>Optoelectronic logic gates that integrate optical inputs with electrical outputs offer a promising route toward high-bandwidth, low-power in-sensor computing. However, most existing implementations require precise control over the excitation wavelength, optical power, or gate bias, which complicates device fabrication and system integration. Here, we demonstrate a reconfigurable optoelectronic logic device based on a VSe₂/MoTe₂ van der Waals heterojunction. The device exhibits a rectification ratio exceeding 10³ in the dark and a pronounced photovoltaic response, including a light on/off ratio surpassing 10⁷, a responsivity of 0.28 A/W, and external quantum efficiency of 54%, as well as a noise-equivalent power of 4.6 × 10^-14 W/Hz^1/2 and a specific detectivity of 2.1 × 10¹⁰ cm Hz^1/2/W. By reconfiguring the source and drain electrodes and modulating the optical input, six fundamental Boolean logic operations-AND, IMP, NOR, NOT, OR, and NAND-are realized in the device. Notably, all six logic functions are obtained under fixed illumination and predefined bias, without requiring wavelength, power, or gate modulation. Switching between functions requires only a specific bias voltage and a change in the source/drain connection (for certain operations, OR and NAND, the input state is redefined). These results underscore the promise of two-dimensional material-based van der Waals heterojunctions for compact, low-power, and reconfigurable optoelectronic logic processing.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13666891/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149182985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of Segmented Thermoelectric Generator with Wavy Structure and Nanofluid Cooling: Variable Structure.","authors":"Edgar Alan De Los Santos-Castañeda, Sara Eunice Olivares-Hernández, Miguel Ángel Olivares-Robles, Pedro Guevara-López","doi":"10.3390/nano16191248","DOIUrl":"10.3390/nano16191248","url":null,"abstract":"<p><p>Thermoelectric generators (TEGs) are highly sensitive to both geometric configuration and thermal boundary conditions, particularly the heat dissipation mechanisms at the cold side. Despite extensive research on thermoelectric materials, cooling strategies, and geometric optimization, the coupled influence of hollow sinusoidal geometries and convective cooling conditions remains insufficiently understood. Therefore, this work presents an integrated electrothermal optimization of a segmented hollow sinusoidal thermoelectric generator using a finite element model developed in ANSYS Workbench 2023 R1. The proposed TEG is composed of hollow thermoelements segmented with Bi₂Te₃ and skutterudite using a fixed segmentation ratio. Attention is given to the effects of the revolution distance (dr) and inter-leg spacing (D), geometric parameters that have received limited attention in previous studies. The performance of the device was evaluated by varying the revolution distance from 0.15 mm to 0.58 mm under applied heat fluxes (q″) ranging from 5000 to 35,000 W/m2. Additionally, the influence of inter-leg spacing on voltage generation was systematically investigated. Cooling conditions included both an idealized constant-temperature boundary condition of 25 °C, employed for model validation, and convective cooling conditions based on TiO2, graphene, distilled water, Fe3O4, and Al2O3 nanofluids. The convective heat transfer coefficients were determined from nanofluid thermoelectric properties and implemented as thermal boundary conditions at the cold side of the thermoelectric generator. Among the cooling media evaluated, TiO2-based cooling exhibited the closest performance to constant-temperature condition. Nevertheless, the assumption of a constant cold-side temperature was found to overestimate the thermoelectric performance compared with convective cooling conditions scenarios. The results revealed that both geometric parameters and cooling conditions significantly affect the electrothermal behavior of the device. The maximum output voltage of approximately 0.39 V was obtained for dr=0.15 mm under TiO2-based cooling and an applied heat flux of 35,000 W/m2. Increasing the revolution distance from 0.15 mm to 0.58 mm reduced voltage generation. Furthermore, the inter-leg spacing exhibited a non-linear influence on voltage generation, highlighting the complex interaction between geometry and thermal transport mechanisms. The findings also demonstrate the importance of simultaneously considering revolution distance, inter-leg spacing, thermal loading, and convective nanofluid-based cooling conditions during thermoelectric generator design and optimization.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13666653/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149182110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mesoporous Silica-Supported MOF Composites for CO₂ Capture: Fabrication, Synergistic Effects, and Limitations.","authors":"Chunling Xin, Dongqi Song, Lili Liu, Xiaojing Zhou, Dan Li, Wei Zhang, Yi Yu, Xia Wang, Xishi Tai","doi":"10.3390/nano16191249","DOIUrl":"10.3390/nano16191249","url":null,"abstract":"&lt;p&gt;&lt;p&gt;The continuous rise in atmospheric carbon dioxide (CO&lt;sub&gt;2&lt;/sub&gt;) concentration poses a severe challenge to the global climate, creating an urgent need for the development of efficient, stable, and economically viable carbon-capture technologies. Metal-organic frameworks (MOFs), with their ultra-high specific surface area and tunable pore architecture, have demonstrated significant potential for CO&lt;sub&gt;2&lt;/sub&gt; adsorption. However, single MOF materials are typically constrained by limitations such as high mass transfer resistance, poor hydrothermal stability, and difficulties in processing their powdered form. Coupling MOF with ordered mesoporous silica (MS) to construct hierarchical MOF@MS composite materials has been proven to be an effective strategy for overcoming these shortcomings. This review systematically summarizes the recent research progress on mesoporous silica-supported MOF composite materials for CO&lt;sub&gt;2&lt;/sub&gt; capture. First, an architecture-based taxonomy is established in which every composite is assigned according to five decision rules-nucleation site, synthesis sequence, spatial arrangement of the two phases, interfacial bonding, and the intended role of the mesoporous silica-and six architecture classes are distinguished; systems that lack either a crystalline MOF phase or a siliceous mesoporous phase (MOF-on-MOF hybrids, wood-supported MOF, and amine-loaded silica) are explicitly excluded from the comparative analysis. Second, the principles, advantages, and drawbacks of the individual preparation routes, including in situ growth, confined growth, layer-by-layer assembly, post-synthetic assembly, selective etching, physical mixing, and macroscopic shaping, are discussed in detail and mapped onto that taxonomy. Third, the multiple synergistic adsorption mechanisms between mesoporous silica and MOF are deeply analyzed, encompassing the optimization of mass transfer by hierarchical pore structures, the enhancement of active site accessibility and stability through interfacial bonding, and the improvement of CO&lt;sub&gt;2&lt;/sub&gt; selectivity via functional group modification. On this basis, this review objectively examines the core challenges and limitations currently faced in this field, such as pore blockage, weak interfacial interactions, performance degradation under realistic flue-gas conditions (containing moisture and impurities), and high costs associated with large-scale preparation. Finally, to address these issues, future research directions are proposed from five perspectives: developing novel stable composite materials, optimizing green scalable synthesis processes, deepening multi-scale theoretical simulations, establishing standardized evaluation systems oriented toward realistic operating conditions, and exploring multifunctional integrated and stimuli-responsive materials. This review aims to provide focused and systematic guidance for the rational design of next-generation MOF@MS adsorbents for CO&lt;sub&gt;2&lt;/sub&gt; c","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13667008/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149183301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inorganic-Ion-Stabilized Au Nanoparticles Supported on SiO₂: Synthesis, Physicochemical Characterization, and Proof-of-Concept Raman Response Toward Methylene Blue.","authors":"Jorge Luis Mendoza Tellez, Omar E Uribe-Juárez, Bruno Landeros-Rivera, Alba Adriana Vallejo-Cardona, Diana M Osorio-Londoño, Federico González García, Francisco Tzompantzi, Raúl Pérez-Hernández, Rebeca Sosa Fonseca, Luis Alberto Moreno Ruiz, Ana María Soto-Estada, Iris N Serratos","doi":"10.3390/nano16191243","DOIUrl":"10.3390/nano16191243","url":null,"abstract":"<p><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 Stöber method, functionalized with (3-aminopropyl)triethoxysilane (APTES), and decorated with gold nanoparticles (AuNPs) formed using an inorganic stabilization strategy involving OH^- and Cl^- ions, without conventional organic AuNP capping agents. Complementary characterization by Fourier-transform infrared spectroscopy (FTIR), ultraviolet-visible diffuse reflectance spectroscopy (UV-VIS DRS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) supported the sequential surface modification and formation of the SiO₂-APTES-AuNPs hybrid material. TEM yielded average diameters of 100.81 ± 1.74 nm for SiO₂ nanoparticles (<i>n</i> = 50) and 2.00 ± 0.31 nm for supported AuNPs (<i>n</i> = 80). Methylene blue (MB) was subsequently used for a proof-of-concept Raman evaluation. At 10^-3 and 10^-4 M MB, relative Raman signal-amplification ratios of approximately 7.5 and 3.5, respectively, were obtained from the integrated response near 1620 cm^-1; these values are not conventional surface-enhanced Raman scattering (SERS) enhancement factors. At 10^-6 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···Au and π···Au 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.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"16 19","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13667054/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149183227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}