论文部分内容阅读
采用种子生长法制备了不同长径比的金纳米棒,并通过金硫键的结合在其表面包覆半胱氨酸分子。利用紫外-可见吸收光谱仪,扫描电子显微镜以及拉曼光谱仪等对样品进行分析和表征。实验结果表明金纳米棒产率较高,且一致性较好。表面修饰后的金纳米棒的纵向吸收峰发生蓝移,表明半胱氨酸分子与金纳米棒的结合有助于溶液分散性的提升。以结晶紫为探针分子,随着金纳米棒长径比的增加其拉曼增强效果变强。进一步分析发现,修饰后的金纳米棒的表面增强拉曼光谱的增强效果并未受到影响。通过金纳米棒与半胱氨酸分子牢固的结合,一方面可以提高金纳米棒溶液的分散性与稳定性;另一方面半胱氨酸分子可为金纳米棒修饰其它有机官能团提供了一个牢固的桥梁,有效地拓展了金纳米棒的应用方向。
Gold nanorods with different aspect ratios were prepared by seed growth method, and cysteine molecules were coated on the surface through gold-sulfur bond. The samples were analyzed and characterized by UV-Vis absorption spectroscopy, scanning electron microscopy and Raman spectroscopy. Experimental results show that gold nanorods yield higher consistency. The blue shift of the longitudinal absorption peak of the surface-modified gold nanorods indicates that the combination of the cysteine molecules and the gold nanorods helps to improve the solution dispersibility. With crystal violet as the probe molecule, Raman enhancement effect becomes stronger as the aspect ratio of gold nanorods increases. Further analysis showed that the enhancement of surface-enhanced Raman spectra of the modified gold nanorods was unaffected. The strong binding of gold nanorods to cysteine molecules can improve the dispersibility and stability of gold nanorods solution. On the other hand, cysteine molecules can provide a solid gold nanorods to modify other organic functional groups Of the bridge, effectively expanding the direction of the application of gold nanorods.