【摘要】 研究了银溶胶与L-苯丙氨酸溶液体系的表面增强拉曼光谱(SERS),增强效果明显,L-苯丙氨酸在银溶胶中的SERS光谱与苯丙氨酸固体常规拉曼光谱相比,主要峰位置基本一致,但某些峰发生了频移,相对强度也发生了一定变化。探讨了三种不同的激发光源对SERS光谱强度的影响。用不同光源测定,其SERS光谱图中各峰位置基本不变,但峰强度有明显变化。在实际工作中应根据需要选择合适的光源,一般情况下以514.42nm为佳。不同浓度的苯丙氨酸在银溶胶中产生的表面增强拉曼光谱有明显的差别,浓度太大或太小都不利于SERS光谱的产生,溶液浓度在1×10-3mol.L-1时SERS最强,增强效果最好。体系的pH对增强效应亦有较大的影响,在pH为8时增强效应最强,这是pH对银溶胶的凝聚状态和苯丙氨酸分子存在状态综合影响的结果。更多还原

【Abstract】 The surface enhanced Raman scattering(SERS) of L-phenylalanine solution system was studied in the present paper.The enhancement effect is obvious.Compared to the conventional Raman spectra of solid phenylalanine,the frequency deviations of some peaks in the SERS spectra were observed,and the relative strengths of some peaks were certainly changed.The influence of three different laser sources on the intensity of SERS spectra is discussed.The 514.42 nm of laser source is the best among the 514.42,632.81 and 785.18 nm.The intensity of SERS spectra can be changed with the concentration of L-phenylalanine.It does not benefit the formation of SERS spectra when the concentration is too high or too low.When the concentration of bottom solution is 1×10-3mol·L-1,the enhancement effect of SERS is the strongest.The pH value of system also has obvious effect on the SERS,and when the pH value is 8,the enhancement effect of SERS is the best.It is the total influence of the pH on the coacervation of the silver sol and existent form of the phenylalanine.更多还原