Water-Stable CsPbBr3/Cs4PbBr6 Nanocrystals with a Mixed Fluoropolymer Shell for Optical Temperature Sensing

Zhangdi Lu; Yanxiu Li; Yilei Xue; Wentao Zhou; Steevanson Bayer; Ian D. Williams; Andrey L. Rogach; Stefan Nagl

doi:10.1021/acsanm.2c00050

Water-Stable CsPbBr₃/Cs₄PbBr₆Nanocrystals with a Mixed Fluoropolymer Shell for Optical Temperature Sensing

Zhangdi Lu
, Yanxiu Li
, Yilei Xue
, Wentao Zhou
, Steevanson Bayer
, Ian D. Williams
, Andrey L. Rogach^*
, Stefan Nagl^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

27 Citations (Scopus)

60 Downloads (CityUHK Scholars)

Abstract

Hyflon AD 60 and dodecafluoroheptylpropyl-trihydroxysilane are employed as ligands to synthesize water-stable core-shell CsPbBr₃/Cs₄PbBr₆ nanocrystals in aqueous dispersion, with a high photoluminescence quantum yield of 73% and a long luminescence lifetime of 207 ns. The obtained CsPbBr₃/Cs₄PbBr₆ NCs passivated by fluorinated ligands are well dispersed in water with a mean diameter of 21.9 nm. The whole synthesis can be performed at room temperature on air; fluorinated chains of the Hyflon ligand strongly bond on the surface of CsPbBr₃/Cs₄PbBr₆ nanocrystals and further link amphiphilic fluorinated silanol molecules through hydrophobic interactions. CsPbBr₃/Cs₄PbBr₆ nanocrystals are stable in the aqueous phase for at least 1 month, maintaining strong photoluminescence (68% of initial intensity after 31 days) because of surface passivation. They are used as a luminescent temperature probe in water with a sensitivity of its intensity equal to 1.01% K^-1 and good thermal stability for 10 heating-cooling cycles between 278 and 328 K.

Original language	English
Pages (from-to)	5025–5034
Journal	ACS Applied Nano Materials
Volume	5
Issue number	4
Online published	21 Mar 2022
DOIs	https://doi.org/10.1021/acsanm.2c00050
Publication status	Published - 22 Apr 2022

Funding

We gratefully acknowledge the support of the Hong Kong Research Grants Council (Project 26310119, S. Nagl), and a Senior Fellowship of the Croucher Foundation of Hong Kong (A. L. Rogach) as well as the service of the Materials Characterization and Preparation Facility (MCPF) 26 at the Hong Kong University of Science and Technology for assistance in the characterization of perovskite NCs.

Research Keywords

core-shell
fluorinated silanol
Hyflon AD 60
luminescent temperature probe
surface passivation
water-stable CsPbBr3/Cs4PbBr6nanocrystals

Publisher's Copyright Statement

COPYRIGHT TERMS OF DEPOSITED POSTPRINT FILE: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Nano Materials, copyright © 2022 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsanm.2c00050.

RGC Funding Information

RGC-funded

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title = "Water-Stable CsPbBr3/Cs4PbBr6 Nanocrystals with a Mixed Fluoropolymer Shell for Optical Temperature Sensing",

abstract = "Hyflon AD 60 and dodecafluoroheptylpropyl-trihydroxysilane are employed as ligands to synthesize water-stable core-shell CsPbBr3/Cs4PbBr6 nanocrystals in aqueous dispersion, with a high photoluminescence quantum yield of 73\% and a long luminescence lifetime of 207 ns. The obtained CsPbBr3/Cs4PbBr6 NCs passivated by fluorinated ligands are well dispersed in water with a mean diameter of 21.9 nm. The whole synthesis can be performed at room temperature on air; fluorinated chains of the Hyflon ligand strongly bond on the surface of CsPbBr3/Cs4PbBr6 nanocrystals and further link amphiphilic fluorinated silanol molecules through hydrophobic interactions. CsPbBr3/Cs4PbBr6 nanocrystals are stable in the aqueous phase for at least 1 month, maintaining strong photoluminescence (68\% of initial intensity after 31 days) because of surface passivation. They are used as a luminescent temperature probe in water with a sensitivity of its intensity equal to 1.01\% K-1 and good thermal stability for 10 heating-cooling cycles between 278 and 328 K.",

keywords = "core-shell, fluorinated silanol, Hyflon AD 60, luminescent temperature probe, surface passivation, water-stable CsPbBr3/Cs4PbBr6nanocrystals",

author = "Zhangdi Lu and Yanxiu Li and Yilei Xue and Wentao Zhou and Steevanson Bayer and Williams, \{Ian D.\} and Rogach, \{Andrey L.\} and Stefan Nagl",

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T1 - Water-Stable CsPbBr3/Cs4PbBr6 Nanocrystals with a Mixed Fluoropolymer Shell for Optical Temperature Sensing

AU - Lu, Zhangdi

AU - Li, Yanxiu

AU - Xue, Yilei

AU - Zhou, Wentao

AU - Bayer, Steevanson

AU - Williams, Ian D.

AU - Rogach, Andrey L.

AU - Nagl, Stefan

PY - 2022/4/22

Y1 - 2022/4/22

N2 - Hyflon AD 60 and dodecafluoroheptylpropyl-trihydroxysilane are employed as ligands to synthesize water-stable core-shell CsPbBr3/Cs4PbBr6 nanocrystals in aqueous dispersion, with a high photoluminescence quantum yield of 73% and a long luminescence lifetime of 207 ns. The obtained CsPbBr3/Cs4PbBr6 NCs passivated by fluorinated ligands are well dispersed in water with a mean diameter of 21.9 nm. The whole synthesis can be performed at room temperature on air; fluorinated chains of the Hyflon ligand strongly bond on the surface of CsPbBr3/Cs4PbBr6 nanocrystals and further link amphiphilic fluorinated silanol molecules through hydrophobic interactions. CsPbBr3/Cs4PbBr6 nanocrystals are stable in the aqueous phase for at least 1 month, maintaining strong photoluminescence (68% of initial intensity after 31 days) because of surface passivation. They are used as a luminescent temperature probe in water with a sensitivity of its intensity equal to 1.01% K-1 and good thermal stability for 10 heating-cooling cycles between 278 and 328 K.

AB - Hyflon AD 60 and dodecafluoroheptylpropyl-trihydroxysilane are employed as ligands to synthesize water-stable core-shell CsPbBr3/Cs4PbBr6 nanocrystals in aqueous dispersion, with a high photoluminescence quantum yield of 73% and a long luminescence lifetime of 207 ns. The obtained CsPbBr3/Cs4PbBr6 NCs passivated by fluorinated ligands are well dispersed in water with a mean diameter of 21.9 nm. The whole synthesis can be performed at room temperature on air; fluorinated chains of the Hyflon ligand strongly bond on the surface of CsPbBr3/Cs4PbBr6 nanocrystals and further link amphiphilic fluorinated silanol molecules through hydrophobic interactions. CsPbBr3/Cs4PbBr6 nanocrystals are stable in the aqueous phase for at least 1 month, maintaining strong photoluminescence (68% of initial intensity after 31 days) because of surface passivation. They are used as a luminescent temperature probe in water with a sensitivity of its intensity equal to 1.01% K-1 and good thermal stability for 10 heating-cooling cycles between 278 and 328 K.

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KW - fluorinated silanol

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KW - luminescent temperature probe

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