研究目的
Investigating the combination of Double Pulse LIBS (DP-LIBS) with Nanoparticle-Enhanced LIBS (NELIBS) for signal enhancement in Laser Induced Breakdown Spectroscopy (LIBS).
研究成果
The study successfully demonstrated the feasibility of combining DP-LIBS with NELIBS in a spatially offset configuration, achieving a higher Enhancement Factor (EF) than single-pulse NELIBS. The results indicate the potential for further improvement of NELIBS and its adaptability to diverse instrumental setups.
研究不足
The study was limited by the experimental setup's constraints, such as the inability to register spectra for spatially offset configurations greater than 1 mm due to beam quality degradation and the proximity to the edge of the AgNPs dried deposition. The magnitude of EF observed was lower than in some literature, possibly due to experimental conditions and NP deposition nature.
1：Experimental Design and Method Selection:
The study uses a double pulse Nd:YAG laser operating at 1064 nm with two parallel non-collinear laser pulses to combine DP-LIBS and NELIBS.
2：Sample Selection and Data Sources:
Copper sheets were used as samples, treated with silver nanoparticles (NPs) either commercially available or prepared by pulsed laser ablation in liquid.
3：List of Experimental Equipment and Materials:
A double pulse Nd:YAG laser (LS-2134D, Lotis), silver nanoparticles (AgNPs) from Sigma-Aldrich and prepared by PLAL, copper sheets, and an Aryelle 200 Echelle spectrograph coupled with an air-cooled ICCD.
4：Experimental Procedures and Operational Workflow:
The laser was focused on the sample with a plano-convex lens, and light was collected by a fiber optic. The spectra were obtained with specific acquisition delay and integration time.
5：Data Analysis Methods:
The Enhancement Factor (EF) was calculated as the ratio between the integrated NELIBS and LIBS intensities for the Cu I emission line at 521,8 nm.
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