Peptide-Passivated Lead Halide Perovskite Nanocrystals Based on Synergistic Effect between Amino and Carboxylic Functional Groups
Peptide-Passivated Lead Halide Perovskite Nanocrystals Based on Synergistic Effect between Amino and Carboxylic Functional Groups
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DOI：
10.1002/adfm.201604018
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发表时间：
2017-02-10
影响因子：
19
通讯作者：
Zhang, Jin Z.
中科院分区：
文献类型：
--
作者：
Luo, Binbin;Naghadeh, Sara Bonabi;Zhang, Jin Z.
采用具有氨基和羧基官能团的多肽作为钝化配体，制备了具有优异光学性能的甲基铵溴化铅（CH3NH3PbBr3）钙钛矿纳米晶体。只有当氨基和羧基同时参与时，才能得到钝化良好的pnc，这是由于它们之间的质子化反应。氨基和。COOH对pnc的成功钝化至关重要。为了更好地理解这种协同作用，研究和比较了不同长度的肽。由于多肽的极性性质，多肽钝化的pnc（表示为pncpeptide）聚集并从非极性甲苯溶剂中沉淀，导致高产品收率（约为44%）。此外，通过调节肽的浓度，pncpeptide的尺寸可以在3.9 ~ 8.6 nm范围内变化，由于量子限制效应，pncpeptide的光学性质可以调节。此外，CsPbBr3 pnc也以多肽作为盖层配体合成，进一步证明了该策略的通用性和多功能性，这对于生产用于发光二极管、光学传感和成像等光子学应用的高质量pnc非常重要。
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 PNCspeptide) aggregate and precipitate from nonpolar toluene solvent, resulting in a high product yield (approximate to 44%). Furthermore, the size of PNCspeptide can be varied from approximate to 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.