通过巯基乙酸(TGA)修饰的金纳米颗粒(AuNPs)静电吸附在UiO-66表面制备得到UiO-66/AuNPs的表面增强拉曼(SERS)基底, 研究了基底对不同带电性质的六种有机色素(孔雀石绿、亚甲基蓝、藏红T、柠檬黄、日落黄、刚果红)的SERS响应规律。结果发现, UiO-66/AuNPs对阳离子型孔雀石绿、亚甲基、蓝藏红T染料的增强因子分别为2.12×104、4.46×104、7.20×104, 比阴离子型柠檬黄、日落黄、刚果红染料的增强因子(1.43×102、2.54×102、1.73×102)高2个数量级。因此, UiO-66/AuNPs基底可以通过静电吸附选择性提高对阳离子型色素的检测灵敏度, 是一种有着广阔应用前景的高效SERS传感器材料。

Combing the metal organic frameworks (MOFs) with surface enhanced Raman scattering (SERS) hybrid substrates have been to a focus of high-efficiency SERS detection. In this study, we developed a MOF-SERS substrate by immobilizing the thioctic acid-modified gold nanoparticles (AuNPs) onto the surface of UiO-66 through electrostatic interactions. The effect factor (EF) of UiO-66/AuNPs substrates for the cationic malachite green, methylene blue and saffron T were 2.12×104, 4.46×104 and 7.20×104, two orders of magnitude higher than the EF of 1.43×102, 2.54×102 and 1.73×102 for the anionic lemon yellow, sunset yellow and congo red. Overall, UiO-66/AuNPs substrates can selectively improve the detection sensitivity of cationic pigments by electrostatic adsorption and are a highly efficient SERS sensor material with promising applications.