研究目的
To synthesize ZnO nanoparticles by pulsed laser ablation of zinc powders suspending in deionized water and characterize their morphology, structure, and optical properties.
研究成果
ZnO NPs were successfully synthesized by pulsed laser ablation of zinc powders suspending in deionized water. The NPs possess a hexagonal wurtzite structure and are of polycrystalline in nature. Annealing in N2 resulted in an improvement in the structure. The ZnO NPs exhibit typical optical absorption and photoluminescence characteristics of ZnO.
研究不足
The synthesized ZnO NPs have irregular shapes and sizes, and the method requires optimization for controlling the shape, size, and properties of ZnO NPs.
1：Experimental Design and Method Selection:
Pulsed laser ablation of zinc powders suspending in deionized water was used to synthesize ZnO nanoparticles. A frequency-doubled Q-switched Nd:YAG laser was employed for ablation.
2：Sample Selection and Data Sources:
Metallic zinc powders (>95% in purity) were used as the raw material. The synthesized ZnO NPs were characterized using TEM, HRTEM, Raman backscattering spectroscopy, FTIR spectroscopy, XRD, and PL measurements.
3：List of Experimental Equipment and Materials:
A pulsed laser beam from a frequency-doubled Q-switched Nd:YAG laser, a cylindrical convex lens, a magnetic stirrer, a PerkinElmer Lambda 950 ultraviolet-infrared spectrophotometer, an Ocean Optics USB2000 miniature fiber optic spectrometer, a Tecnai G2 F20 S-Twin electron microscope, a Rigaku D/MAX 2550VB/PC X-ray diffractometer, a Jobin Yvon HR-Evolution confocal micro-Raman spectrometer, and a Bruker Vertex 80V spectrometer.
4：Experimental Procedures and Operational Workflow:
Zinc powders were suspended in deionized water and irradiated by a pulsed laser beam focused by a cylindrical lens. The synthesized ZnO NPs were characterized for their morphology, structure, and optical properties.
5：Data Analysis Methods:
The data were analyzed using TEM, HRTEM, Raman backscattering spectroscopy, FTIR spectroscopy, XRD, and PL measurements.
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Bruker Vertex 80V spectrometer
Vertex 80V
Bruker
Used for FTIR spectroscopy of the ZnO NPs on Si.
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PerkinElmer Lambda 950 ultraviolet-infrared spectrophotometer
Lambda 950
PerkinElmer
Used to record the transmission spectra of the ZnO colloidal solutions.
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Ocean Optics USB2000 miniature fiber optic spectrometer
USB2000
Ocean Optics
Used to measure the emitted luminescence from the ZnO colloidal solutions.
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Rigaku D/MAX 2550VB/PC X-ray diffractometer
D/MAX 2550VB/PC
Rigaku
Used for XRD characterization of the ZnO NPs transferred on Si.
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frequency-doubled Q-switched Nd:YAG laser
Used for pulsed laser ablation of zinc powders suspending in deionized water to synthesize ZnO nanoparticles.
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cylindrical convex lens
Used to focus the pulsed laser beam for ablation.
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magnetic stirrer
Used to continuously stir the water suspended with zinc powders to prevent them from sinking.
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Tecnai G2 F20 S-Twin electron microscope
G2 F20 S-Twin
Tecnai
Used for morphological observation and microstructural characterization of the ZnO NPs.
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Jobin Yvon HR-Evolution confocal micro-Raman spectrometer
HR-Evolution
Jobin Yvon
Used for Raman backscattering measurement of the ZnO NPs on Si.
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