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- 实验方案
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Ti-MOF derived TixFe1-xOy Shells Boost Fe2O3 Nanorod Cores for Enhanced Photoelectrochemical Water Oxidation
摘要： TixFe1-xOy shells, in-situ formed from thermal treatment of a Ti-containing metal organic framework, NH2-MIL-125(Ti), significantly boost the photoelectrochemical water oxidation efficiency of Fe2O3 nanorod cores. The NH2-MIL-125(Ti) was coated on the surface of the Fe2O3 nanorods with a solvothermal process, followed by a two step calcination to afford the TixFe1-xOy shell/Fe2O3 core nanorod arrays. The TixFe1-xOy shell/Fe2O3 core nanorod array electrode exhibited much improved photoelectrochemical activities over the pristine Fe2O3 nanorod array electrode, boosting photo-current densities to 26.7 folds of that achieved by the pristine Fe2O3 nanorod array electrode at 1.23 V (vs. RHE) under illumination of simulated sun light of AM 1.5G. The success may be attributed to the much enhanced charge separation enabled by the hole trapping heterojunction of TixFe1-xOy shell/Fe2O3 core. The photoelectrochemical stability of the TixFe1-xOy shell/Fe2O3 core nanorod array electrode was excellent, retaining 98.9% of the initial photo-current density after a 5 hr continuous operation. This work is the first demonstration of MOF derived core-shell heterojunction for large improvements of PEC water splitting efficiencies, and can be readily extended to a wide range of catalyst design.
关键词： NH2-MIL-125(Ti),Fe2O3 nanorod,TixFe1-xOy shell/Fe2O3 core nanorod arrays,photoelectrochemical water oxidation,photoanode
更新于2025-09-23 15:19:57
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Plasmon-induced Ag decorated CeO <sub/>2</sub> nanorod array for photodetector application
摘要： In this work, glancing angle deposition (GLAD) has been used to grow Ag decorated CeO2 nanorod (NR) array on n-type Si substrate. The length of the NRs obtained was ～235 nm and the size of the Ag NPs varied from 13 to 41 nm. The polycrystalline and crystalline nature of CeO2 and Ag respectively was revealed via selected area electron diffraction (SAED) analysis as well as x-ray diffraction (XRD) pattern. Optical absorption measurement depicts a distinct broad peak around 413 nm that is ascribed to the localized surface plasmon resonance (LSPR) effect of Ag NPs. The Ag decorated CeO2 NR device exhibited a turn on voltage at ～3.2 V under dark, which then reduced to ～1.3 V under 35 min illumination along with the increase in device current from 2.8 to 24.5 μA cm?2 (4 V) on continuous exposure to light. Under white light illumination, a responsivity of 4.51 A W?1 was obtained at 370 nm along with the detectivity and noise equivalent power (NEP) values of 4.15×1012 jones and 0.01 pW respectively. Additionally, a fast response characteristic with rise and fall times of 74 ms and 42 ms respectively was demonstrated. Thus, these findings manifest the underlying LSPR mechanism at work in Ag/CeO2 heterojunction and reveal its high potential in UV photodetector application.
关键词： GLAD,surface plasmon,nanorod,silver,nanoparticle,cerium oxide
更新于2025-09-23 15:19:57
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Dye-sensitized solar cells based on TiO2 nanoparticles-decorated ZnO nanorod arrays for enhanced photovoltaic performance
摘要： Herein, we report a successful approach for the vertically aligned ZnO nanorod arrays (ZNAs) deposited on fluorine-doped tin oxide (FTO) substrate by hydrothermal process. TiO2 nanoparticles were grown on the ZNAs by dip-coating. ZNAs and TiO2 nanoparticles (TNPs)-decorated ZNAs (TNPs@ZNAs) were used as a photoanode in dye-sensitized solar cells. The influence of bath temperature for the attainment of uniform decoration of TiO2 nanoparticles onto ZnO nanorod arrays and the photovoltaic performances of the assembled dye-sensitized solar cells were studied. The power conversion efficiency (PCE) of the TNPs@ZNAs arrays prepared at a bath temperature of 120 °C can reach 4.47%, representing better improvement when compared with ZNAs photoanode (3.15%).
关键词： Nanorod arrays,Bath temperature,Dye-sensitized solar cells,TiO2 decorated ZnO
更新于2025-09-23 15:19:57
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Tunable Plasmonic Resonances in TiN Nanorod Arrays
摘要： In this work, titanium nitride (TiN) nanorod arrays were fabricated using glancing angle deposition in a magnetron sputtering system. The deposition parameters, including the bias on the substrate and the flow rate of nitrogen, were varied to deposit various TiN nanorod arrays. Before glancing angle deposition was conducted, uniform TiN films were deposited and their permittivity spectra, for various deposition parameters, were obtained. The effect of the deposition parameters on the morphology of the nanorods is analyzed here. The polarization-dependent extinctance spectra of TiN nanorod arrays were measured and compared. Extinction, which corresponds to the longitudinal mode of localized surface plasmon resonance, can be significantly changed by tuning the N2 flow rate and substrate bias voltage during deposition.
关键词： glancing angle deposition,plasmonic mode,permittivity,titanium nitride,nanorod array
更新于2025-09-23 15:19:57
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Plasmonic Electronsa??Driven Solara??toa??Hydrocarbon Conversion over Au NR@ZnO Corea??Shell Nanostructures
摘要： This work demonstrates the long-range redox reactivity of gold plasmon-generated hot electrons for solar-driven CO2 conversion. A series of Au NR@ZnO core-shell photocatalysts with a tunable shell thickness are rationally designed to achieve the solar-to-CH4 conversion, where the hot plasmonic electrons-induced photoreduction takes place on the polar oxide moiety. The shell thickness-independent activity implies that the core, gold nanorods, plays a dominant role in the CH4 generation. The ZnO metal oxide semiconductor shell is beneficial to prolong the lifetime of hot electrons, thereby enhancing the photocatalytic efficiency. However, the thickness of ZnO shell is not relevant to the production rate. Both of these two parts are co-excitated by solar light and synergetic enhance the photocatalytic activity.
关键词： gold nanorod,core-shell nanostructure,ZnO,photocatalysis,CO2 photoreduction,plasmon resonance
更新于2025-09-23 15:19:57
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Influence of Surface Modifier Molecular Structures on the Photovoltaic Performance of Sb <sub/>2</sub> S <sub/>3</sub> Sensitized TiO <sub/>2</sub> Nanorod Array Solar Cells
摘要： In this paper, Sb2S3 sensitized TiO2 nanorod arrays are prepared by the pyrolysis of 1.2 M antimony-thiourea complex solution in DMF at 270 ℃ for 10 min. Various surface modifiers with different functional groups and carbon numbers of C10H21PO3H2, C12H25SO3Na, C3H7COOH, C5H11COOH, C7H15COOH, C11H23COOH, C13H27COOH, C15H31COOH and C17H35COOH are applied to modify Sb2S3 sensitized TiO2 nanorod arrays. The corresponding solar cells are fabricated, and their photovoltaic performances are evaluated. To the different functional group surface modifiers, the improvement of functional group on photovoltaic performance is the order of -COOH > -PO3H2 > -SO3Na. To the different carbon number (4-18) surface modifiers, RCOOH with carbon number range of 8-12 exhibit better photovoltaic performance. Moreover, the Sb2S3 sensitized TiO2 nanorod array solar cells with C11H23COOH achieve the best photoelectric conversion efficiency (PCE) of 5.37 % with the open-circuit voltage (Voc) of 0.53 V, short-circuit current density (Jsc) of 16.98 mA?cm-2, fill factor (FF) of 60.66 % and the average PCE of 5.11±0.21 % with the Voc of 0.52±0.01 V, Jsc of 16.65±0.24 mA?cm-2, FF of 58.93±1.21 %. The PCE of 5.37 % corresponding to the use of spiro-OMeTAD as the hole transporting material is a relatively high PCE for Sb2S3 solar cells.
关键词： spiro-OMeTAD,Sb2S3 sensitized TiO2 nanorod array,solar cell,surface modifier
更新于2025-09-23 15:19:57
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Morphology control and luminescence properties of red-emitting BaSiF6:Eu3+ hexagonal nanorod phosphors for WLEDs
摘要： To promote the development of solid-state lighting industry, exploring excellent inorganic phosphors has been always a scientific and applied hot issue. Herein, a series of efficient red BaSiF6:Eu3+ hexagonal nanorod phosphors with varied size and morphology were successfully prepared through a hydrothermal route. The reaction time, dosage of surfactant and solvent play an important role in the formation of the nanorod structures. The corresponding formation mechanism was discussed and revealed. The effects of surfactant, reaction time and solvent on photoluminescence properties of the as-prepared BaSiF6:Eu3+ nanorod phosphors were investigated in detail. Under excitation at 394 nm, all samples emit bright red light due to the typical Eu3+ 4f-4f transitions. Comparing the luminescence intensity of samples with different size of nanorods, it is found that the length of the nanorod is about 10–20 μm, the luminescence intensity of the sample is 3–5 times of the initial intensity of the nanorod sample that the length is around 30–40 μm. Moreover, when adding ethylene glycol as a solvent, the luminescence intensity of samples with different morphology increases with the increase of the reaction time. Importantly, as the temperature rising to 150 °C, the integrated intensity of the as-prepared sample still could obtain more than 95% of the intensity at room temperature, indicating the phosphors show excellent thermal stability. Thus, the as-prepared BaSiF6:Eu3+ nanorod phosphor is a potential red-emitting phosphor for white light-emitting diodes (WLEDs).
关键词： BaSiF6:Eu3+,luminescence properties,hydrothermal synthesis,thermal stability,WLEDs,hexagonal nanorod phosphors
更新于2025-09-23 15:19:57
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Substrate-modulated directional far field scattering behavior of individual plasmonic nanorods
摘要： Steering the energy of the incident light into the specific directions by using plasmonic nanostructures plays a key role for future micro-nano photonic integration and optical imaging systems, but the influence of the dielectric substrate on the full-space far-field scattering image of metal nanostructures remains unintuitive. In this paper, the influence of dielectric substrate on the far-field scattering behavior of surface plasmon resonance mode is systematically investigated. By using a simple model, we found that the dielectric substrate could suppress the backscattering energy of plasmon mode. The forward scattering energy of plasmon mode will be concentrated as the refractive index of the substrate increased. We also realized a directional forward scattering of plasmon mode energy by combining the dielectric substrate and dielectric/metal structures. Our research provides a new strategy for the directional control of the incident light energy in a dielectric substrate.
关键词： Lossless dielectric substrate,Surface plasmon resonance,Far field pattern,Directional radiation,Nanorod
更新于2025-09-23 15:19:57
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Self-Aligned Hierarchical ZnO Nanorod/NiO Nanosheet Arrays for High Photon Extraction Efficiency of GaN-Based Photonic Emitter
摘要： Advancements in nanotechnology have facilitated the increased use of ZnO nanostructures. In particular, hierarchical and core–shell nanostructures, providing a graded refractive index change, have recently been applied to enhance the photon extraction e?ciency of photonic emitters. In this study, we demonstrate self-aligned hierarchical ZnO nanorod (ZNR)/NiO nanosheet arrays on a conventional photonic emitter (C-emitter) with a wavelength of 430 nm. These hierarchical nanostructures were synthesized through a two-step hydrothermal process at low temperature, and their optical output power was approximately 17% higher than that of ZNR arrays on a C-emitter and two times higher than that of a C-emitter. These results are due to the graded index change in refractive index from the GaN layer inside the device toward the outside as well as decreases in the total internal re?ection and Fresnel re?ection of the photonic emitter.
关键词： ZnO nanorod/NiO nanosheet,photon extraction e?ciency,photonic emitter,self-align,hierarchical nanostructures
更新于2025-09-23 15:19:57
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Fabrication and Characterization of Ni-Doped ZnO Nanorod Arrays for UV Photodetector Application
摘要： In this work, the structure morphologies, lattices, and optical properties of zinc oxide (ZnO) nanorods (NRs) with various amounts of nickel (Ni) dopants were investigated and explored. The 100 nm ZnO seed layer was grown on the Corning glass substrate by the radio frequency (RF) magnetron sputtering technique, and the chemical bath deposition (CBD) method was used to grow NR arrays. It was found that the Ni concentration of the sample is 1.06 at% by EDX spectra examination. All the NRs exhibited a hexagonal wurtzite structure and preferentially grew along the c-axis on the substrate. Additionally, the ultraviolet (UV) photodetectors (PDs) with Ni-doped ZnO (NZO) NRs based on metal-semiconductor-metal (MSM) structure were fabricated through a photolithography process. Then, such a sample was annealed at 500 °C to obtain good performance and reduced oxygen vacancy (～560 nm). The results showed that the NZO NRs were with an excellent photosensitivity for UV PD applications and a faster rise/decay time than pure ZnO. Furthermore, with a 3 V applied bias and 380 nm UV illumination, the sensitivities of the fabricated ZnO PDs with different Ni contents (0, 4, and 8 mM) were 71.45, 393.04, and 238.75, respectively.
关键词： nanorod arrays,photolithography process,chemical bath deposition,UV photodetector,Ni-doped ZnO
更新于2025-09-23 15:19:57