Highly Stable Luminous “Snakes” from CsPbX₃ Perovskite Nanocrystals Anchored on Amine-Coated Silica Nanowires

Journal Article · 18 December 2018 · ACS Applied Nano Materials

DOI: https://doi.org/10.1021/acsanm.8b01889 · OSTI ID:1599795

Pan, Aizhao  ^[1]; Jurow, Matthew J.  ^[2]; Wu, Youshen ^[1]; Jia, Mengjun ^[1]; Zheng, Fuyin ^[3]; Zhang, Yanfeng ^[1]; He, Ling ^[1]; Liu, Yi  ^[2]

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1. Xi’an Jiaotong Univ. (China)
2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

CsPbX₃ (X = Cl, Br, and I) perovskite nanocrystals (NCs) are known for their exceptional optoelectronic properties, yet the material's instability toward polar solvents, heat, or UV irradiation greatly limits its further applications. Herein, an efficient in situ growing strategy has been developed to give highly stable perovskite NC composites (abbreviated CsPbX₃@CA-SiO₂) by anchoring CsPbX₃ NCs onto silica nanowires (NWs), which effectively depresses the optical degradation of their photoluminescence (PL) and enhances stability. The preparation of surface-functionalized serpentine silica NWs is realized by a sol-gel process involving hydrolysis of a mixture of tetraethyl orthosilicate (TEOS), 3-aminopropyltriethoxysilane (APTES), and trimethoxy(octadecyl)silane (TMODS) in a water/oil emulsion. The serpentine NWs are formed via an anisotropic growth with lengths up to 8 μm. The free amino groups are employed as surface ligands for growing perovskite NCs, yielding distributed monodisperse NCs (~8 nm) around the NW matrix. The emission wavelength is tunable by simple variation of the halide compositions (CsPbX₃, X = Cl, Br, or I), and the composites demonstrate a high photoluminescence quantum yield (PLQY 32-69%). Additionally, we have demonstrated the composites CsPbX₃@CA-SiO₂ can be self-woven to form a porous 3D hierarchical NWs membrane, giving rise to a superhydrophobic surface with hierarchical micro/nano structural features. The resulting composites exhibit high stability toward water, heat, and UV irradiation. Finally, this work elucidates an effective strategy to incorporate perovskite nanocrystals onto functional matrices as multifunctional stable light sources.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC); China Postdoctoral Science Foundation Funded Project; Fundamental Research Funds for the Central Universities; Shaanxi province Youth Foundation
• Grant/Contract Number: AC02-05CH11231; 51802254; 51573145; 2017M623149; xjj2018053; 2018JQ5011
• OSTI ID: 1599795
• Journal Information: ACS Applied Nano Materials, Vol. 2, Issue 1; ISSN 2574-0970
• Publisher: American Chemical Society (ACS)Copyright Statement
• Country of Publication: United States
• Language: English