The solid-liquid triboelectric nanogenerator (TENG) represents an innovative energy technology, where the integration of multifunctional micro/nano-structures is pivotal for enhancing TENG performance through composite energy input. Despite its promise, the fabrication of surface triboelectric layers with controlled three-dimensional multifunctional structures remains a formidable challenge, primarily due to limitations in existing processing methods. In this study, we propose a method that combines femtosecond laser temporal-shaped processing with the hydrothermal approach. This synergistic approach enables the creation of a morphology-controllable three-dimensional stereo-structured array of zinc dioxide(ZnO) micrometer columns on the surface of PVDF films. This results in the development of a surface electric layer exhibiting a composite enhancement in photovoltaic and piezoelectric properties. Through laser modulation of the PVDF surface morphology and the distribution of ZnO nanopillar seeds, we successfully achieved 3D stereostructured arrays comprising micrometer pillars with an average size of 3 μm. The proposed method offers a flexible and rapid means to realize the fabrication of multifunctional composite-enhanced solid-liquid triboelectric nanogenerators. This advancement extends the utility of TENG in large-scale fabrication and the utilization of oceanic micro energy, showcasing its potential for broader applications.
We report a highly sensitive electrolytic copper (Cu) detection method using nanoparticle enhanced laser-induced breakdown spectroscopy (NELIBS) for metal smelting processes. The sulfate solution Cu with content ranging from 10 to 50 g/L was prepared and measured on the nanoparticle chip. The experimental results showed that the Cu spectral line intensity of NELIBS increased 5.5 to 9.4 times compared with typical LIBS without nanoparticles. The calibration curve was established based on the spectral line intensity at Cu I 327.40 nm according to the different Cu content in the solution. The determination coefficient R2 of the calibration curve was 0.99. The method of laser-induced breakdown spectroscopy based on drying liquid droplets on the nanoparticle chip can be applied to the rapid determination of Cu content in the copper electrolyte.
The paper introduces an experimental scheme for measuring the phase of double laser pulses based on the combination of near-field time-stretched dispersion Fourier transform(TS-DFT) and Gerchberg-Saxton(GS) algorithm. The scheme uses dispersive fibers to perform near-field dispersion Fourier transform on the double pulse signal, and then uses the GS algorithm of time domain simulation to complete the phase recovery of the double laser pulses. Finally, the algorithm simulation of this scheme successfully recovered the phase information of the double pulses, which verified the feasibility of the scheme.
We demonstrate a method for simultaneous measurement of thickness and refractive index of transparent materials based on spectrally-resolved interferometry. By extracting the phase from the interference spectrum, the measured optical path difference can be obtained directly without phase shift device in the measurable range. This unique advantage makes it capable of measuring physical thickness and refractive index by introducing transparent medium and processing three useful optical path differences. In the long-term stability test, the repeatability experiment of spectral resolution interferometric ranging technology using femtosecond laser is carried out within 60 min, and the standard deviation is 341nm.
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