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Light-Gated Synthetic Protocells for Plasmon-Enhanced Chemiosmotic Gradient Generation and Phosphorylation
摘要： Here, we present the construction of a light-gated protocell model made of plasmonic colloidal capsules (CCs) assembled with lipoprotein bacteriorhodopsin for converting solar energy into electrochemical gradients and further driving synthesis of energy storage molecules. Not only did this synthetic protocell incorporate essential features of CCs, but it also assimilated such an important intrinsic property of noble metal colloidal particles as plasmonic resonance. Specially, the near-field coupling between adjacent metal nanoparticles gave rise to strongly localized electric fields and resulted in a broad absorption in the whole visible spectra, which in turn promoted to bacteriorhodopsin and accelerated the proton pumping kinetics. The cell-like potential of this design was further demonstrated by leveraging the outward pumped protons as 'chemical signals' for triggering ATP biosynthesis in a coexistent synthetic protocell population. Hereby, we lay the groundwork for engineering of colloidal supraparticle-based synthetic protocells with higher-order functionalities.
关键词： protocell,colloidal capsule,bacteriorhodopsin,plasmonic resonance,chemiosmotic gradient
更新于2025-09-19 17:15:36
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Ag NPs modified plasmonic Z-scheme photocatalyst Bi4Ti3O12/Ag/Ag3PO4 with improved performance for pollutants removal under visible light irradiation
摘要： In a typical Z-scheme photocatalytic system, the visible light responsive component typically plays a crucial role and is often confined to materials sensitive to visible light. In addition, metallic nanodots or quantum dots are used as effective cocatalysts in the construction of plasmonic Z-scheme photocatalysts because of their strong light harvesting capacities under visible light illumination. In the present study, Bi4Ti3O12 nanosheets dominated with (001) crystal planes were successfully prepared via a facile molten-salt method, and BTO/Ag/APO composite samples were prepared by a simple precipitation method followed by photoreduction. The obtained BTO/Ag/APO composite exhibits improved photocatalytic activity for the decontamination of two typical organic pollutants, compared to bare Bi4Ti3O12 and Ag3PO4. Based on various characterization techniques, a Z-scheme electron transfer mechanism induced by the plasmonic effect was hypothesized to clarify the enhanced catalytic performances in this system. On the other hand, the LSPR effect of deposited silver nanoparticles can boost the molecular oxygen activation process and generate more superoxide radicals. This study provides a promising approach to apply highly effective photocatalytic degradation for environmental remediation.
关键词： Localized surface plasmonic resonance,Ag3PO4 nanospheres,Bi4Ti3O12 nanosheets,Photocatalysis
更新于2025-09-19 17:13:59
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Plasmonic Ag@TiO <sub/>2</sub> Core-Shell Nanoparticles for Enhanced CO <sub/>2</sub> Photoconversion to CH <sub/>4</sub>
摘要： Ag@TiO2 nanoparticles (NPs) with Ag metal cores and TiO2 semiconductor shells were prepared with a hydrothermal method and their structure was characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The core-shell Ag-TiO2 NPs were deposited on a glass plate and employed as photocatalysts for CO2 conversion by irradiation of solar simulator (AM1.5) under CO2 atmosphere. Selective CH4 evolution by CO2 photoconversion was attained with the core-shell Ag@TiO2 NP photocatalyst. The CH4 evolution rate normalized by specific surface areas was ten times higher than those of reference TiO2 NPs and conventional TiO2 NPs with accompanying Ag deposits. The role of the Ag core was also demonstrated in photodecomposition of a dye by the core-shell Ag@TiO2 NPs. These results suggested the high photocatalytic activity of the core-shell Ag@TiO2 NPs was archived due to bandgap improvement of the TiO2 shell and increase of photon flux to the TiO2 shell by the plasmonic Ag core.
关键词： Photocatalytic CO2 Reduction,Surface Plasmonic Resonance,Ag@TiO2,Core-shell Structure,Light Scattering Effect
更新于2025-09-19 17:13:59
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Remarkable improved photoelectric performance of SnS2 field-effect transistor with Au plasmonic nanostructures
摘要： The photoelectric devices developing towards the high integration and miniaturization in semiconductor industry can be pushed forward by the thriving research of two-dimensional layered metal dichalcogenides (2D-LMDs). SnS2 nanosheets have evident photoresponse to both ultraviolet and partial visible light, but only with a fair photoelectric performance limited by its atomic-layer thickness. Here we report a convenient and simple method to make a dramatic enhancement of the electrical and photoelectric performance of the SnS2 flake. By integrating SnS2 with Au plasmonic nanostructures, the photocurrent (Iph) increased by over 20 times. And the corresponding responsivity (R), light gain (G), and detectivity (D*) have been improved by ~2200%, 2200%, and 600%, respectively. The responsivity and detectivity of the Au NPs-SnS2 FET at 532 nm are 1125.9 A/W and 2.12×1011 Jones. Though being atomically thin, the hybrid SnS2 photodetector benefiting from local surface plasmonic resonance achieves an excellent photoelectric performance not normally possible with the pristine SnS2-only device.
关键词： 2D material,SnS2,field effect transistor,photodetector,plasmonic resonance
更新于2025-09-19 17:13:59
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Tunable multimodal magnetoplasmonic metasurfaces
摘要： The spectrally controllable enhancement of the transverse magneto-optical Kerr effect is realized in 2D hybrid metal-dielectric magnetoplasmonic metasurfaces. The light diffracted at different interfaces allows one to manipulate light phase in the condition of plasmonic and waveguiding resonance excitation controllable via the azimuthal angle. The multimodal nature of the system provides the flexible tunability of its magneto-optical response.
关键词： azimuthal angle,magneto-optical Kerr effect,magnetoplasmonic metasurfaces,plasmonic resonance,waveguiding resonance
更新于2025-09-16 10:30:52
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Near-infrared multi-narrowband absorber based on plasmonic nanopillar metamaterial
摘要： A multi-narrowband absorber composed of gold nanopillar metamaterial is numerically designed and investigated in this paper. Full-wave simulations indicate that five distinctive narrow-band absorption peaks with the maximum absorption rate up to 99.3% and the lowest above 80% can be achieved in the near-infrared regime at normal incidence. Polarization dependence over a incident angular range of ± 30° is also researched. We demonstrate the spectroscopic tunability of our absorber by adjusting the structural parameters of the gold nanopillar array. Physical mechanism of the multi-narrowband absorption is construed as the vertical Fabry-Perot-like gap plasmonic resonances induced by electric and magnetic dipolar polaritons. Compared to the previous researches on multi-band absorbers, we realize no less than five near-infrared narrow absorption bands by utilizing just simple configuration with single pattern, which makes considerable application potential in the fields of absorption filtering and spectroscopic sensing.
关键词： Metamaterial,Multi-band absorber,Near-infrared,Gap plasmonic resonance
更新于2025-09-16 10:30:52
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Single-step biosynthesis of Ag/AgCl@TiO2 plasmonic nanocomposite with enhanced visible light photoactivity through aqueous leaf extract of a mangrove tree
摘要： Ag/silver halides have recently received attention in the synthesis of heterostructured nanocomposites. Although important, the green biosynthesis of Ag/silver halide nanocomposites has not yet been reported. Herein, a simple, single-step biosynthesis process was implemented using aqueous leaf extract (ALE) of the mangrove Avicennia marina to synthesize Ag/AgCl@TiO2 plasmonic nanocomposites with enhanced visible light photoactivity. Characterization results showed that the ALE was necessary for nanocomposites preparation as a reducing and stabilizing agent. With increase in the ALE/AgNO3 ratio (R1) of the initial precursor from 0 to 1.63, the diffraction peaks of Ag/AgCl became visible slowly and their intensity increased. Besides, AgNO3/tetraethylorthotitanate ratio (R2) had a positive effect on increasing the intensity of Ag/AgCl diffraction peaks. The UV light absorption intensity of Ag/AgCl@TiO2 was improved and displayed stronger absorption by increasing R1 values. A broad absorption peak was recorded in the visible wavelength spectrum of the biosynthesized nanocomposites from 400 to 600 nm, centered at 500 nm, which could be associated with the surface plasmon resonance effect of spatially detained electrons in Ag/AgCl nanocrystals. This enhanced absorption showed the photoactivity of the biosynthesized nanocomposites in the visible light region, which was confirmed in a real application for degradation of eosin Y with 99.8% efficiency under sunlight. Thus, it seems that the biological procedure, which is environmentally friendly and inexpensive, could replace the conventional approaches to synthesize Ag/AgCl@TiO2 plasmonic nanocomposites with enhanced visible light photoactivity.
关键词： Surface plasmonic resonance,Semiconductors,Visible light,Biosynthesis,Avicennia marina
更新于2025-09-12 10:27:22
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Stronger Reductive Environment in Solvothermal Synthesis Leads to Improved Ga Doping Efficiency in ZnO Nanocrystals and Enhanced Plasmonic Absorption
摘要： The key parameter for degenerated semiconductor oxide plasmonic nanocrystals is the doping level. Hydrothermal and solvothermal approaches are considered to be less effective toward achieving high concentration of aliovalent donor dopants in a host oxide when compared to other synthesis methods that use long chain hydrocarbon solvents, fatty acids, and fatty amines as precursors. Because of this, although they have several advantages such as sustainability, ease of use, relatively inexpensive reagents and apparatus, and reduced environmental impact, they are excluded from the list of potential synthesis methods. Herein, an effective Zn2+ substitution with aliovalent Ga3+ in the ZnO host lattice is demonstrated, and it is achieved by increasing the reductive power of the solvothermal synthesis conditions by either solvent substitution or the addition of reducing agents. This increase results in an increased oxidation affinity of the medium. This in turn promotes Ga3+ incorporation into the ZnO lattice, by skewing the reaction equilibrium toward oxygen evolution.
关键词： plasmonic resonance,semiconductor nanocrystals,gallium-doped zinc oxide,degenerated oxide semiconductor nanocrystals
更新于2025-09-11 14:15:04
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Dewetting Metal Nanofilms—Effect of Substrate on Refractive Index Sensitivity of Nanoplasmonic Gold
摘要： The localized surface plasmon resonance (LSPR) sensitivity of metal nanostructures is strongly dependent on the interaction between the supporting substrate and the metal nanostructure, which may cause a change in the local refractive index of the metal nanostructure. Among various techniques used for the development of LSPR chip preparation, solid-state dewetting of nano?lms offers fast and cost effective methods to fabricate large areas of nanostructures on a given substrate. Most of the previous studies have focused on the effect of the size, shape, and inter-particle distance of the metal nanostructures on the LSPR sensitivity. In this work, we reveal that the silicon-based supporting substrate in?uences the LSPR associated refractive index sensitivity of gold (Au) nanostructures designed for sensing applications. Speci?cally, we develop Au nanostructures on four different silicon-based ceramic substrates (Si, SiO2, Si3N4, SiC) by thermal dewetting process and demonstrate that the dielectric properties of these ceramic substrates play a key role in the LSPR-based refractive index (RI) sensitivity of the Au nanostructures. Among these Si-supported Au plasmonic refractive index (RI) sensors, the Au nanostructures on the SiC substrates display the highest average RI sensitivity of 247.80 nm/RIU, for hemispherical Au nanostructures of similar shapes and sizes. Apart from the signi?cance of this work towards RI sensing applications, our results can be advantageous for a wide range of applications where sensitive plasmonic substrates need to be incorporated in silicon based optoelectronic devices.
关键词： refractive index sensitivity,metal nano?lm,localized surface plasmonic resonance,dewetting
更新于2025-09-11 14:15:04
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Tunable and large plasmonic field enhancement in core-shell heterodimer/trimer
摘要： Heterodimer/trimer are two/three closely adjacent nanoparticles dissimilar in shape or size, and represent a simple nanoscale geometry which gives rise to a remarkably rich set of properties. The core-shell nanostructure has advantages of tunability and stability over a similar homogeneous particle. We theoretically demonstrate tunable and significant field enhancement in both heterodimer and heterotrimer systems using core-shell geometry with a metal shell and dielectric core and compared our results with core-shell homodimer and homotrimer. The analytical modeling is based on the Rayleigh theory for small particles and Foldy–Lax multi-scattering theory for multiple particles. It is shown that the E-field can be enhanced in core-shell dimer/trimer due to the plasmonic resonance in the metal shell, which can be easily tunable by changing the core-shell ratio, composition of the core and shell, relative size and distance between the particles, and wavelength of the incident light. We report significant maximum field intensity enhancement near the particles. Moreover, this tunable nanostructures with high field intensity can be useful as potential bio-sensing applications.
关键词： tunability,Foldy–Lax theory,core-shell NPs,Heterotrimer,Rayleigh theory,plasmonic resonance
更新于2025-09-11 14:15:04