中文摘要：

描述了通过只添加氢氧化钠到氯金酸和十六烷基三甲基溴化铵混合液中合成陈化纳米金胶体,并研究了该胶体的光谱特性。基于傅里叶红外光谱对纳米金的形成机理进行了分析并以紫外可见光谱和扫描电子显微镜表征了添加不同量的氢氧化钠而获得的陈化3 m的胶体金。同时获得了吸附于陈化了3 m的胶体金表面上的亚甲基蓝的表面增强拉曼光谱。结果表明,陈化3 m的胶体金其紫外可见光谱具有宽的等离子吸收峰,对这种宽化改变进行了解释分析。其透射电子显微镜分析表明在纳米金合成阶段,添加不同量的氢氧化钠可影响纳米金大小,同时不同量的氢氧化钠影响着胶体金的陈化过程并产生出形状依赖的陈化胶体金。表面增强拉曼光谱的增强特性不同证明了所形成的陈化胶体金的大小/形状依赖特征。因此,我们期望着这种陈化胶体金能够在生化分析领域被得到开发应用。

英文摘要：

The present paper described the spectra properties of aged gold colloids, which were synthesized by only adding NaOH to the chloroauric acid and hexadecyl trimethyl ammonium bromide （CTAB） mixture solution. The formation mechanism for the gold nanoparticles （AuNPs） was discussed based on the Fourier transform infrared spectroscopy （FTIR） analysis. The gold colloids with different amounts of NaOH were aged for three months and then characterized by UV-Vis spectrometer and transmission electron microscopy （TEM）. Moreover, surface-enhanced Raman scattering （SERS） spectra of methylene blue （MB） on the three months aged gold colloids were obtained. UV-Vis spectrometer showed the broadening of plasmon absorption peak of three months aged gold colloids. And an explanation for the broadening changes was provided in the as-prepared samples. TEM images demonstrate that the diameter and shape change of the AuNPs depend on addition difference NaOH at the stage of the synthesis, and the NaOH also affect the aging process. The corresponding SERS spectra on the aged three months gold colloid display the size/shape-dependent properties. Therefore, we expect that the aged colloidal gold will be developed and applied in biochemical analysis field.