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Preparation of ordered mesoporous Au using double gyroid mesoporous silica KIT-6 via a seed-mediated growth process
摘要： Ordered mesoporous Au was prepared using double-gyroid (cubic Ia3d) mesoporous silica KIT-6 as a template. The Au frameworks were formed within the template via a seed-mediated growth process. Au nanoparticles were initially prepared as seeds within the mesopores, and subsequently, they were grown under mild and controlled reducing conditions. The transmission electron micrographs and scanning electron micrographs of mesoporous Au after the removal of the template revealed the formation of mesoporous Au replicas. The small-angle X-ray scattering pattern of mesoporous Au reveals that the obtained mesoporous Au has a cubic I4132 mesostructure, which is different from that of the original template, implying that Au was deposited within only one mesochannel of the two interconnected ones. The seed-mediated growth process is a key factor in the successful formation of ordered mesoporous Au using a mesoporous silica template. Our preparative method can serve as a guide for further development of synthetic and materials chemistry of mesoporous Au.
关键词： Gold,Nanostructure,Template synthesis,Mesoporous materials
更新于2025-09-23 15:21:21
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Plasmonic Manipulation-Controlled Chiral Crystallization of Sodium Chlorate
摘要： Plasmonic manipulation using well-designed triangular trimeric gold nanostructures achieves giant crystal enantiomeric excess (CEE), more than 50%, of sodium chlorate (NaClO3). Stronger asymmetric interaction between molecule and light are pursued to reach high enantiomeric excess. The well-designed gold nanostructures immersed in a saturated NaClO3 D2O solution was irradiated with linear, left-hand, and right-hand circular polarizations of a 1064 nm continuous-wave laser. Within seconds of the start of the irradiation, an achiral metastable crystal was formed at the laser focus, and further irradiation induced a subsequent polymorphic transition to the chiral crystal. The crystal chirality is sensitive to the using handedness circular polarization, allowing for efficient enantioselectivity. The mechanisms to achieve this giant CEE are proposed based on the results of electromagnetic field analysis generated near the nanostructure by the Finite Element Method.
关键词： Plasmonic trapping,Crystal chirality,Crystal enantiomeric excess,Angular momentum,Gold nanostructure
更新于2025-09-23 15:21:01
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Plasmonic biosensors fabricated by galvanic displacement reactions for monitoring biomolecular interactions in real time
摘要： Optical sensors are prepared by reduction of gold ions using freshly etched hydride-terminated porous silicon, and their ability to specifically detect binding between protein A/rabbit IgG and asialofetuin/Erythrina cristagalli lectin is studied. The fabrication process is simple, fast, and reproducible, and does not require complicated lab equipment. The resulting nanostructured gold layer on silicon shows an optical response in the visible range based on the excitation of localized surface plasmon resonance. Variations in the refractive index of the surrounding medium result in a color change of the sensor which can be observed by the naked eye. By monitoring the spectral position of the localized surface plasmon resonance using reflectance spectroscopy, a bulk sensitivity of 296 nm ± 3 nm/RIU is determined. Furthermore, selectivity to target analytes is conferred to the sensor through functionalization of its surface with appropriate capture probes. For this purpose, biomolecules are deposited either by physical adsorption or by covalent coupling. Both strategies are successfully tested, i.e., the optical response of the sensor is dependent on the concentration of respective target analyte in the solution facilitating the determination of equilibrium dissociation constants for protein A/rabbit IgG as well as asialofetuin/Erythrina cristagalli lectin which are in accordance with reported values in literature. These results demonstrate the potential of the developed optical sensor for cost-efficient biosensor applications.
关键词： Surface functionalization,Optical sensor,Lectin,Localized surface plasmon resonance,Biomolecular interactions,Gold nanostructure
更新于2025-09-23 15:19:57
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Broadband aggregation-independent plasmonic absorber for highly efficient solar steam generation
摘要： Achieving efficient solar steam generation under natural sunlight has huge potential for sewage purification and seawater desalination. Plasmonic resonance has been extensively exploited for enhancing and extending the range of optical absorption. Up till now, most reported broadband plasmonic solar absorbers are designed by compact aggregation or engineering plasmonic architectures. In this work, we develop a new plasmonic absorber using gold nanostructure with the shape of a trepang (nano-trepang). By rationally regulated anisotropy at the single nanoparticle level, the nano-trepang show good optical absorption over the entire solar spectrum (92.9 %) with no requirement of engineering nanoparticles aggregation or constructing plasmonic architecture. The nano-trepang were then loaded into a polymeric aerogel and the network shows excellent solar-to-vapor energy conversion of 79.3%. Under 1 sun AM1.5 G irradiation, a stable solar vapor rate of 2.7 kg m-2 h-1 can be achieved, with high performance of anti-salt precipitation in the practice seawater steam generation. This work shows a broadband plasmonic absorber with aggregation-independent performance for high-efficient solar stream generation and provides new strategy for practical solar desalination.
关键词： plasmonic absorber,solar desalination,gold nanostructure,solar steam generation,nano-trepang
更新于2025-09-23 15:19:57