Peptide-Passivated Lead Halide Perovskite Nanocrystals Based on Synergistic Effect between Amino and Carboxylic Functional Groups

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• 作者：Binbin Luo ; Sara Bonabi Naghadeh ; A'Lester Allen ; Xueming Li and Jin Z. Zhang
• 刊名：Advanced Functional Materials
• 出版年：2017
• 出版时间：February 10, 2017
• 年：2017
• 卷：27
• 期：6
• 全文大小：2104K
• ISSN：1616-3028

文摘

A new strategy has been developed using peptides with amino and carboxylic functional groups as passivating ligands to produce methyl ammonium lead bromide (CH₃NH₃PbBr₃) perovskite nanocrystals (PNCs) with excellent optical properties. The well-passivated PNCs can only be obtained when both amino and carboxylic groups are involved, and this is attributed to the protonation reaction between NH₂ and COOH that is essential for successful passivation of the PNCs. To better understand this synergistic effect, peptides with different lengths have been studied and compared. Due to the polar nature of peptides, peptide-passivated PNCs (denoted as PNCs_peptide) aggregate and precipitate from nonpolar toluene solvent, resulting in a high product yield (≈44%). Furthermore, the size of PNCs_peptide can be varied from ≈3.9 to 8.6 nm by adjusting the concentration of the peptide, resulting in tunable optical properties due to the quantum confinement effect. In addition, CsPbBr₃ PNCs are also synthesized with peptides as capping ligands, further demonstrating the generality and versatility of this strategy, which is important for generating high quality PNCs for photonics applications including light-emitting diodes, optical sensing, and imaging.