研究目的
Investigating the fabrication of ZnO nanoparticles by laser ablation in liquids and analyzing the relationship between the diameter of ZnO nanoparticles and laser energy, as well as the variation of photoluminescence spectra with different laser energy.
研究成果
ZnO nanoparticles were successfully fabricated by laser ablation in liquids using a 1064 nm Nd:YAG laser. The diameter of nanoparticles decreased with increasing laser energy, and uniform nanoparticles were obtained at a laser energy of 50 mJ. Photoluminescence spectra, AFM images, and XRD patterns were used to characterize the ZnO nanoparticles.
研究不足
The drawback of LAL is the lack of simple methods for controlling the diameter of nanoparticles. The study focuses on laser pulse energy as a method for controlling the diameter of nanoparticles.
1：Experimental Design and Method Selection:
The experiment utilized laser ablation in liquids (LAL) to prepare ZnO nanoparticles, focusing a pulsed laser onto a Zn target submerged in water. Different laser energies were used to form ZnO nanoparticles.
2：Sample Selection and Data Sources:
A bulk Zn target (purity of
3：99%) was used, immersed in de-ionized water. List of Experimental Equipment and Materials:
Nd:YAG laser with wavelength of 1064 nm, pulse width of 15 ns, and repetition rate of 5 Hz; focusing lens with focal length of 15 cm; Zn target with diameter of 5 cm and thickness of
4：5 cm. Experimental Procedures and Operational Workflow:
Laser beam with different energy from 30 to 70 mJ was conducted into the Zn target. The suspension was stirred, centrifuged, and the supernatant was moved to a loft drier.
5：Data Analysis Methods:
The size, structure, and photoluminescence spectra of ZnO nanoparticles were analyzed using XRD and AFM.
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