研究目的
Investigating the synthesis of monodisperse single crystalline gold nanoparticles with tunable size and shape for plasmonic applications.
研究成果
The developed three-step seed-mediated synthesis allows precise control over the size and shape of gold nanoparticles, enabling the tuning of their plasmonic properties. The mechanism of growth and the effect of additives on nanoparticle morphology were elucidated, providing a foundation for designing nanoparticles with desired optical properties.
研究不足
The study focuses on the synthesis and characterization of gold nanoparticles, with limited discussion on potential applications or scalability of the synthesis method.
1：Experimental Design and Method Selection:
A three-step seed-mediated synthesis method was employed to produce gold nanoparticles with tunable size and shape. The effect of KBr and ascorbic acid (AA) on the growth kinetics and morphology was systematically studied.
2：Sample Selection and Data Sources:
Initial small gold seeds were synthesized and used to prepare single crystalline spherical seeds, which were then grown into faceted particles with tunable ratios of cubic {100} and octahedral {111} facets.
3：List of Experimental Equipment and Materials:
Chemicals included HAuCl4·3H2O, CTAB, CTAC, CPC, NaBH4, AA, AgNO3, and KBr. Equipment included UV-Vis spectrophotometer, SEM, TEM, and EELS.
4：Experimental Procedures and Operational Workflow:
The synthesis involved the preparation of initial seeds, spherical seeds, and finally faceted nanoparticles by adjusting the concentrations of KBr and AA. The particles were characterized using UV-Vis, TEM, SEM, and EELS.
5：Data Analysis Methods:
The growth kinetics were analyzed using the Finke-Watzky autocatalytic two-step mechanism. Plasmonic properties were investigated through EELS and simulations.
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