酸性条件下染料结晶紫分子的近红外表面增强拉曼散射研究

比较了染料分子结晶紫(CV)在酸性与中性条件下的金胶体系中的近红外表面增强拉曼光谱(NIR-SERS)。结果表明,结晶紫分子-金胶体系中结晶紫分子在1064nm近红外光激发条件下,其荧光得以大大淬灭,同时拉曼得到了至少不低于105倍的增强;当进一步加入硝酸使得其处于酸性气氛下时,由于部分结晶紫分子与硝酸发生了化学作用形成了结晶紫分子的单替代衍生物(HCV),而HCV与结晶紫分子相比,更容易吸附在金属表面,因此结晶紫分子NIR-SERS还将有很大的增强。这可以给我们很大的启示:改变体系的酸碱度也可以达到改变其SERS的增强效果的目的。

NIR-SERS Study on Crystal Violet Molecules at Acidic Conditions

When exciting at 1064nm, the fluorescence of the crystal violet (CV) in the CVAu sol system will be quenched rapidly and meanwhile its Raman signals will also be enhanced at least 105. After addition of some drops HNO3(1×10-2M), due to the chemical interaction between some CV molecules and HNO3, some HCV derivatives will be formed. Compared with CV, HCV can be adsorbed on metal surface more easily and tightly so there is some extra enhancement in this condition. This phenomena also shows that the SERS enhancement factor of some molecules can be modified by changing the PH of the moleculessols system.