雙重保護的穩定金屬滷化物鈣鈦礦納米片
作者:
小柯機器人發布時間:2021/1/7 13:18:06
美國喬治亞理工學院林志群團隊報導了一種製備雙重保護的穩定金屬滷化物鈣鈦礦納米片的方法。 相關成果於2021年1月03日發表在國際知名學術期刊《德國應用化學》。
合成在一系列外部刺激下具有優異的長期穩定性金屬滷化物鈣鈦礦型納米晶(PNCs)的能力,是其在廣泛的在光電應用領域應用的重要一步。目前,通過在單納米晶(NC)水平上構建具有無機外殼的保護塗層以獲得穩定PNCs,尤其是具有大結構各向異性的PNCs的方法相對較少且範圍有限。
研究人員報告了一種強大的兩親嵌段共聚物支持策略,通過原位形成與疏水聚合物層(第二屏蔽層)緊密連接的均勻無機殼層(第一屏蔽層)來製備高度穩定的各向異性CsPbBr 3納米片(NSs)。雙殼保護NSs顯示出顯著的穩定性(即熱穩定性、光穩定性、水分、極性溶劑、脂肪族胺等),並在白光發光二極體中得到應用。原則上,通過在PNC表面錨定其他多齒兩親性聚合物配體,然後模板化生長感興趣的殼材料,可以創造出多種多樣的雙殼多功能PNCs,其穩定性顯著提高,可用於光學、光電子和傳感設備。
附:英文原文
Title: Dual‐Protected Metal Halide Perovskite Nanosheets with a Stellar Set of Stabilities
Author: Yanjie He, Yachao Liang, Shuang Liang, Yeu Wei Harn, Zili Li, Mingyue Zhang, Zhiwei Li, Yan Yan, Xinchang Pang, Zhiqun Lin
Issue&Volume: 03 January 2021
Abstract: The ability to synthesize metal halide perovskite nanocrystals (PNCs) with outstanding long‐term stability against a set of external stimuli represents an important step towards their use for a wide spectrum of optoelectronic applications. Notably, approaches to achieve stable PNCs of interest, in particular those with large structural anisotropy , via protective coating of inorganic shell at a single‐nanocrystal (NC) level are comparatively few and limited in scope. Herein, we report a robust amphiphilic‐diblock‐copolymer‐enabled strategy for crafting highly‐stable anisotropic CsPbBr 3 nanosheets (NSs) via in‐situ formation of uniform inorganic shell (1 st shielding) that is intimately ligated with hydrophobic polymers (2 nd shielding). The dual‐protected NSs display an array of remarkable stabilities (i.e., thermal, photostability, moisture, polar solvent, aliphatic amine, etc.) and find application in white light‐emitting diodes. In principle, by anchoring other multidentate amphiphilic polymer ligands on the surface of PNCs, followed by templated‐growth of shell materials of interest, a rich variety of dual‐shelled, multifunctional PNCs with markedly improved stabilities can be created for use in optics, optoelectronics and sensory devices.
DOI: 10.1002/anie.202014983
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202014983