研究目的
Investigating the morphology transformation of Ag nanorods (Ag NRs) irradiated with a femtosecond pulse laser and the dependence of near-field ablation on laser polarization and wavelength.
研究成果
The study demonstrated the dependence of near-field ablation on laser polarization and wavelength, enabling control over the morphology of Ag NRs. Various nanostructures were obtained by adjusting the electronic field distribution. The findings suggest a useful approach for nanostructure fabrication.
研究不足
The study focuses on Ag NRs and may not be directly applicable to other materials. The effect of the electric field caused by small clusters on the ablation process was not considered.
1：Experimental Design and Method Selection
The study involved the preparation of Ag NRs through a wet-chemical method and their irradiation with a femtosecond pulse laser to investigate morphology transformation. The near-field ablation was analyzed based on laser polarization and wavelength.
2：Sample Selection and Data Sources
Ag NRs with a mean aspect ratio of 3.9 were synthesized. The absorption spectra for various aspect ratios were obtained, and the morphology transformation was investigated through TEM.
3：List of Experimental Equipment and Materials
Amplified Ti–sapphire laser system, FEI Tecnai G2 F20 TEM, carbon film, copper grids (400 mesh), AgNO3, sodium dodecyl sulfonate, trisodium citrate.
4：Experimental Procedures and Operational Workflow
Ag NRs were synthesized, dropped onto carbon film, and irradiated with a femtosecond pulse laser. The laser polarization and wavelength were adjusted, and TEM images were acquired to observe the morphology transformation.
5：Data Analysis Methods
The evolution mechanism was analyzed through simulation, and the effect of laser polarization angle on plasmonic junction welding was investigated.
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Transmission electron microscopy
FEI Tecnai G2 F20
FEI
Acquisition of TEM images to investigate morphology transformation
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Ti–sapphire laser system
Not provided
Not provided
Emission of femtosecond laser pulses for irradiation of Ag NRs
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Carbon film
Not provided
Not provided
Substrate for Ag NRs during laser irradiation
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Copper grids
400 mesh
Not provided
Support for Ag NRs during TEM imaging
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AgNO3
>99.8%
Sinopharm Chemical Reagent Co., Ltd
Precursor for Ag NRs synthesis
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Sodium dodecyl sulfonate
>99%
Sinopharm Chemical Reagent Co., Ltd
Surfactant in Ag NRs synthesis
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Trisodium citrate
>99%
Beijing Harveybio Gene Technology Co., Ltd
Reducing agent in Ag NRs synthesis
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