基于UiO-66/AuNPs的SERS基底制备与有机色素的检测研究

Preparation of UiO-66/AuNPs SERS substrates and detection of organic dyes

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2.12×10^(4)、4.46×10^(4)、7.20×10^(4),比阴离子型柠檬黄、日落黄、刚果红染料的增强因子(1.43×10^(2)、2.54×10^(2)、1.73×10^(2))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 2.12×10^(4),4.46×10^(4)and 7.20×10^(4),two orders of magnitude higher than the EF of 1.43×10^(2),2.54×10^(2)and 1.73×10^(2)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.