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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。
Describes the synthesis of aged nanogold colloids by adding only sodium hydroxide to a mixture of chloroauric acid and cetyltrimethylammonium bromide and studies the spectral properties of the colloids. The formation mechanism of gold nanoparticles based on Fourier transform infrared spectroscopy was analyzed and characterized by UV-visible spectroscopy and scanning electron microscopy. The aged 3 m colloidal gold was obtained by adding different amounts of sodium hydroxide. At the same time, surface enhanced Raman spectra of methylene blue adsorbed on the surface of colloidal gold aged 3 m were obtained. The results show that the aged 3 m colloidal gold has a broad plasma absorption peak in the UV-Vis spectrum, and the widening change is explained and analyzed. Transmission electron microscopy analysis showed that during the gold nanosynthesis phase, adding different amounts of sodium hydroxide can affect the gold nanoparticle size, while different amounts of sodium hydroxide affect the aging process of colloidal gold and produce a shape-dependent aging colloidal gold . The enhanced properties of surface-enhanced Raman spectroscopy demonstrate the size / shape-dependent characteristics of the resulting aged colloidal gold. Therefore, we expect this kind of aged colloidal gold to be developed and applied in the field of biochemical analysis.