研究目的
Investigating the linear optical properties of gold colloid prepared by reducing HAuCl4·4H2O with Na3C6H5O7·2H2O, and analyzing its optical properties using Maxwell-Garnett effective medium theory and Drude dispersion model.
研究成果
The study concludes that the optical properties of gold colloid are significantly influenced by the volume fraction of gold particles, their size, and the dielectric constant of the matrix medium. The matrix dielectric constant is identified as the main factor affecting the optical properties of gold colloid solution.
研究不足
The study is limited to gold nanoparticles with diameters less than 8 nm and does not explore the effects of other shapes or larger sizes. The analysis is based on the assumption of spherical particles and does not account for potential variations in particle morphology.
1：Experimental Design and Method Selection:
The gold colloid was prepared by reducing HAuCl4·4H2O with Na3C6H5O7·2H2O. The optical properties were analyzed using Maxwell-Garnett effective medium theory and Drude dispersion model.
2：2O. The optical properties were analyzed using Maxwell-Garnett effective medium theory and Drude dispersion model.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Gold nanoparticles were synthesized and characterized for their morphology and size using TEM and UV-Vis spectrophotometry.
3：List of Experimental Equipment and Materials:
FEI Tecnal G2 F20 S-Twin transmission electron microscope (TEM), Rigaku X-ray diffractometer (XRD), HITACHI U-2810 type ultraviolet visible (UV-Vis) spectrophotometer, 85-2 digital thermostat magnetic stirrer.
4：Experimental Procedures and Operational Workflow:
Gold colloid was prepared by adding Na3C6H5O7 aqueous solution and deionized water to a conical flask, stirring at 650 rpm while boiling, rapidly adding HAuCl4 solution, stopping heating and stirring after 6 min, cooling to room temperature, and adding 1-dodecanethiol as a stabilizer.
5：Data Analysis Methods:
The optical properties were analyzed using Maxwell-Garnett effective medium theory and Drude dispersion model.
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