Water-Stable CsPbBr3/Cs4PbBrNanocrystals with a Mixed Fluoropolymer Shell for Optical Temperature Sensing

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Zhangdi Lu
  • Yilei Xue
  • Wentao Zhou
  • Steevanson Bayer
  • Ian D. Williams
  • Stefan Nagl

Detail(s)

Original languageEnglish
Pages (from-to)5025–5034
Journal / PublicationACS Applied Nano Materials
Volume5
Issue number4
Online published21 Mar 2022
Publication statusPublished - 22 Apr 2022

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.

Research Area(s)

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

Citation Format(s)

Water-Stable CsPbBr3/Cs4PbBrNanocrystals with a Mixed Fluoropolymer Shell for Optical Temperature Sensing. / Lu, Zhangdi; Li, Yanxiu; Xue, Yilei; Zhou, Wentao; Bayer, Steevanson; Williams, Ian D.; Rogach, Andrey L.; Nagl, Stefan.

In: ACS Applied Nano Materials, Vol. 5, No. 4, 22.04.2022, p. 5025–5034.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review