Room-Temperature in Situ Synthesis of Highly Efficient CsPbBr₃/SiO₂ Sol in Entirely Ethanol Solvent by Constructing Amine-Functionalized Silica Micelles

Abstract

Cesium lead halide perovskite nanocrystals (CLHP NCs) have drawn considerable attention because of their promising optoelectrical properties. However, owing to extreme vulnerability of CLHP NCs to water and polar alcohols, up to date, most of the synthesis approaches have inevitably adopted ecounfriendly solvents. It is still a big challenge to employ green polar alcohol (ethanol) as a solvent to synthesize CLHP NCs. In this work, we realized a room-temperature in situ synthesis of CsPbBr 3 /SiO 2 sol entirely in ethanol by innovatively constructing amine-functionalized silica micelles, which is originated from the synergistic effect of 3-aminopropyltriethoxysilane and tetraethyl orthosilicate (TEOS) during an acid-catalyzed sol−gel process. The sol exhibited high stability and an absolute photoluminescence quantum yield of 61.9% in ethanol without a further modification process. The light emitting intensity of the sol preserved for 34 days merely declined to 62.1%. This work sheds light on the less common strategy of directly synthesizing CsPbBr 3 NCs and long-term stable preservation in a strong polar solvent.

Monodispersed CsPb2Br5@SiO2 Core–Shell Nanoparticles as Luminescent Labels for Biosensing

“…Accordingly, some successful examples have been reported. − However, most efforts using these conventional SiO 2 coating methods for perovskite NPs failed because perovskite NCs are too sensitive to conditions of Stöber methodology (i.e., the presence of water in a basic medium), which leads to their dissolution . This involves working in soft conditions, resulting in random alkoxysilane polymerization processes.…”

Stable Luminescent CsPbI3 Quantum Dots Passivated by (3-Aminopropyl)triethoxysilane

“…N–H bending changes from −NH 2 in the APTES molecule to −NH 3 + after being coordinated to QDs . Also, the difference in the peak location of Si–O stretching illustrates that APTES, as a silane coupling agent, easily hydrolyzes from −Si–O-C 2 H 5 to −Si–OH and −Si–OH further dehydrates with another adjacent −Si–OH to form the Si–O–Si structure. , Furthermore, detailed surface investigations of these nanocrystals with different surface ligands dispersed in CDCl 3 were carried out by 1 H NMR (Figure b). For conspicuous chemical shifts, the peak present at 3.7 ppm is assigned to antisolvent, C 3 H 6 O 2 .…”

Using design of experiment to obtain a systematic understanding of the effect of synthesis parameters on the properties of perovskite nanocrystals

“…48 Perovskite NC materials therefore behave differently depending on the specific surface chemistry between the material and the ligands used, and alcohol-based perovskite NC synthesis is still relatively novel. 36,44,49 DoE should ideally be repeated for hot injection, ligand assisted reprecipitation, and heat up methods such as microwave synthesis, as well as for other materials such as CsPbBr 3 or novel lead-free perovskite materials. [50][51][52] This study provides greater insight into the alcohol based perovskite NC synthesis and could be extended to investigate other responses such as degradation or optoelectronic device performance.…”