【摘要】 以柠檬酸盐为还原剂,通过共还原氯金酸和硝酸银的混合溶液制备出Au/Ag合金纳米颗粒,用透射电子显微镜(TEM)对颗粒的形貌和尺寸进行了表征。300-800nm范围的吸收光谱研究发现,Au/Ag合金纳米颗粒具有单峰等离子体吸收特征,且随着反应液中氯化金和硝酸银的摩尔比的减少,吸收峰将产生蓝移。实验结果表明,Au-Ag合金纳米颗粒的光学吸收特性具有组分可裁剪性,使其在纳米尺度的光学领域具有潜在的应用价值。更多还原

【Abstract】 Gold-silver alloy nanoparticles were synthesized in aqueous solution by the co-reduction of chlorauric acid HAuCl₄ and silver nitrate AgNO₃ using sodium citrate as reducing agent. TEM was employed to analyse the morphology and size of the alloy nanoparticles. The optical-absorption spectra in the range of 300-800nm show the characteristic of single plasmon resonance absorption band,and the absarption band shows blue-shift with decreasing the molar ratio of HAuCl₄ to AgNO₃ in the reacting solution. The experimental results show that the gold-silver alloy nanoparticles possess composition-dependent tunability of their optical property which makes them have potential applications in the field of nano-optics.更多还原