研究目的
Investigating the effect of laser fluence on the structural and optical properties of silver sulfide nanoparticles synthesized by laser ablation in liquid.
研究成果
The study successfully synthesized Ag2S nanoparticles with monoclinic structure using PLAL. The crystallite size and optical energy gap were found to depend on the laser fluence, with higher fluences leading to larger particles and a decrease in the energy gap. The results suggest that laser fluence is a critical parameter in controlling the properties of Ag2S nanoparticles for optoelectronic applications.
研究不足
The study is limited by the range of laser fluences used and the specific conditions of the ablation process. The effect of other parameters such as pulse duration and wavelength was not explored.
1：Experimental Design and Method Selection:
The study used pulsed laser ablation in liquid (PLAL) to synthesize Ag2S nanoparticles by ablating a silver target in thiourea aqueous solution at different laser fluences.
2：Sample Selection and Data Sources:
High purity silver (
3：9%) pellet was ablated in 1M thiourea aqueous solution. List of Experimental Equipment and Materials:
A Q-switched Nd:YAG laser operating at 532nm, 7ns pulse width, and 2Hz repetition frequency was used. The concentration of Ag2S NPs was measured using UV-Vis spectrophotometry, and their structure was examined with XRD.
4：Experimental Procedures and Operational Workflow:
The laser was focused on the Ag pellet submerged in thiourea solution, with laser fluence varied from
5：38 to 77 Jcm-The ablation time was 15min for each sample. Data Analysis Methods:
The crystallite size was calculated using the Debye-Scherrer equation, and the optical energy gap was determined from UV-Vis absorption spectra using the Tauc plot method.
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