【摘要】 研究了不同的溶液pH值对胶体金颜色、粒径的影响。在不同pH值下通过柠檬酸三钠法制备胶体金溶液,利用紫外/可见光吸收分光光度计对胶体金进行扫描,得到最大吸收峰波长及峰宽;通过透射电镜观察其颗粒直径及分布,再将二者结果进行比较分析。结果显示:随着溶液pH值变小,胶体金颜色由红→蓝→黑,粒径变大。更多还原

【Abstract】 The color and the particle size of colloidal gold were influenced by different pH values. Colloidal gold was prepared with sodium citrate by controlling the pH of the solution. The maximum of absorption and its peak width were obtained from UV/visible absorption spectrophotometry. The diameter and its distribution were measured by transmission electron microscopy (TEM). Then the results were compared and analyzed. The result shows that with the decrease of the pH, the particle size increases and the color of colloidal gold is changed (red-blue-black).更多还原