The surface-enhanced Raman scattering of all-inorganic perovskite quantum dots of CsPbBr3 encapsulated in a ZIF-8 metal–organic framework

Abstract

In this study, composites composed of all-inorganic perovskite quantum dots (QDs) of CsPbBr₃ encapsulated in a metal–organic framework of ZIF-8 (CsPbBr₃@ZIF-8) were prepared using an in situ chemical reduction method. For the first time, the CsPbBr₃@ZIF-8 composites were used for surface-enhanced Raman scattering (SERS). The CsPbBr₃@ZIF-8 composites remained effective and emitted normal luminescence under UV illumination after 200 days of storage at room temperature, indicating that they were able to overcome the instability of perovskite QDs at room temperature and that they can be stored for long-term use. The enhancement factor value is 1.17 × 10⁵. The adsorption behavior of 4-mercaptopyridine (4-MPY) on the CsPbBr₃@ZIF-8 composites was studied using typical SERS spectral bands, and these were contrasted with the SERS spectra on silver films. The enhancement mechanism is attributed to a charge transfer contribution. The results indicate that CsPbBr₃@ZIF-8 composites have potential application in SERS detection.