The surface-enhanced Raman scattering of all-inorganic perovskite quantum dots of CsPbBr₃encapsulated in a ZIF-8 metal–organic framework

Abstract

In this study, all inorganic perovskite quantum dots CsPbBr3 encapsulated in Metal-organic framework ZIF-8 (CsPbBr3@ZIF-8) composites were prepared using an in situ chemical reduction method. For the first time, the...

SERS-Active Composites with Au–Ag Janus Nanoparticles/Perovskite in Immunoassays for Staphylococcus aureus Enterotoxins

“…Besides the EM enhancement mechanism, there may also be existed a chemical enhancement mechanism between Au−Ag Janus NPs and perovskite QDs@MSNs, whose principle is that the substrates would transfer electrons to the lowest unoccupied molecular orbital (LUMO) of the molecule under light induction. 50 As illustrated in Figure 3D, the work function (φ) value of Au−Ag Janus NPs was around 4.50 eV, 51 and the φ values were 4.65 eV for CsPbBr 3 @MSNs and 4.86 eV for CsPb 2 Br 5 @MSNs. 52 Due to the close contact of Au−Ag Janus NPs and perovskite QDs@MSNs, the e − would flow from Au−Ag Janus NPs to perovskite QDs@MSNs, and further enter to the LUMO orbits of MBIA molecules between Au−Ag Janus NPs and perovskite QDs@MSNs.…”

“…Perovskite QDs@MSNs served as a dielectric media and prevented the reduction of EM evanescent wave of plasmonic Au–Ag Janus NPs, producing strong EM field for SERS enhancement, and therefore stronger SERS performance was observed for Au–Ag Janus NPs/CsPbBr 3 @MSNs composites. Besides the EM enhancement mechanism, there may also be existed a chemical enhancement mechanism between Au–Ag Janus NPs and perovskite QDs@MSNs, whose principle is that the substrates would transfer electrons to the lowest unoccupied molecular orbital (LUMO) of the molecule under light induction . As illustrated in Figure D, the work function (φ) value of Au–Ag Janus NPs was around 4.50 eV, and the φ values were 4.65 eV for CsPbBr 3 @MSNs and 4.86 eV for CsPb 2 Br 5 @MSNs .…”

Material design, development, and trend for surface-enhanced Raman scattering substrates

“…53,116,117 After decades of development, more and more semiconductor materials have been reported to exhibit SERS enhancement, including a variety of inorganic semiconductors ( e.g. , metal oxides, 47,118–122 metal sulfides, 123–128 metal selenides, 129–131 metal tellurides, 132–134 metal halides, 135–138 and Si, 139,140 ) and a small number of organic semiconductors ( e.g. , α,ω-diperfluorohexylquaterthiophene 141 ).…”

Binding of CsPbBr3 Nanocrystals to MOF-5 for the Detection of Cadmium Ions in Aqueous Media

“…Further, sensing of 4-mercaptopyridine (4-MPY) has been reported using CsPbBr 3 @ZIF-8, which is stable in UV light for more than 200 days . The unique structure of ZIF-8 MOF (particularly an imidazole linker) enables it to coexist with water and other solvents . However, problems like ion exchange between MOF and CNCs in such combinations increase the complications .…”

“…19 The unique structure of ZIF-8 MOF (particularly an imidazole linker) enables it to coexist with water and other solvents. 27 However, problems like ion exchange between MOF and CNCs in such combinations increase the complications. 25 Thus, choosing an appropriate MOF for CNC and also a suitable technique to combine them into a host−guest system while protecting the desired property is an important area of interest to study.…”