Ag/ZIF-90自组装薄膜的制备及SERS活性研究

合成了金属有机框架化合物沸石咪唑框架-90(ZIF-90)溶胶和ZIF-90晶体薄膜,分别以这2种材料为基底,制备出了Ag@ZIF-90复合材料和Ag/ZIF-90自组装薄膜.通过傅里叶变换红外(FT-IR),X射线衍射(XRD),扫描电子显微镜(SEM)对产物进行表征,分析了它们的形貌和结构特征.以罗丹明6G(R 6G)作为检测分子,对所制备材料的表面增强拉曼散射(SERS)性能进行测试.结果表明制备出的Ag/ZIF-90自组装薄膜具有好的SERS性能,而ZIF-90本身的拉曼峰并不会对Ag/ZIF-90自组装薄膜的SERS检测效果产生影响.这种材料可以作为一种较好的表面增强拉曼(SERS)活性基底,在农药残留检测方面具有很好的应用前景.

Preparation of Ag/ZIF-90 Self-Assembled Membrane and Its High SERS Performance

Zeolitic imidazolate framework-90 (ZIF-90) sol-gel and ZIF-90 crystal membrane were prepared. Then silver nanoparticles(Ag NPs) were hosted in the ZIF-90 sol-gel or on the ZIF-90 crystal membrane to form Ag@ZIF-90 composite or Ag/ZIF-90 self-assembled membrane. The Ag@ZIF-90 composite and Ag/ZIF-90 self-assembled membrane were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) to show their morphorogies and structural features. Rhodamine 6G (R 6G) was used as a detection molecule to test the surface enhanced Raman scattering (SERS) performance of Ag@ZIF-90 composite and Ag/ZIF-90 self-assembled membrane. The SERS signal of R 6G on Ag/ZIF-90 self-assembled membrane was much higher than that on Ag@ZIF-90 composite and the background peak of ZIF-90 did not affect the SERS detection. The Ag/ZIF-90 self-assembled membrane was a promising active SERS substrate, which can be applied in the trace detection of pesticide residue.