Using Perovskite Nanoparticles as Halide Reservoirs in Catalysis and as Spectrochemical Probes of Ions in Solution

Tennyson L. Doane, Kayla L. Ryan, Laxmikant Pathade, Kevin J. Cruz, Huidong Zang, Mircea Cotlet, Mathew M Maye

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

The ability of cesium lead halide (CsPbX3; X = Cl-, Br-, I-) perovskite nanoparticles (P-NPs) to participate in halide exchange reactions, to catalyze Finkelstein organohalide substitution reactions, and to colorimetrically monitor chemical reactions and detect anions in real time is described. With the use of tetraoctylammonium halide salts as a starting point, halide exchange with the P-NPs was performed to calibrate reactivity, stability, and extent of ion exchange. The exchange of CsPbI3 with Cl- or Br- causes a significant blue-shift in absorption and photoluminescence, whereas reacting I- with CsPbBr3 causes a red-shift of similar magnitudes. With the high local halide concentrations and the facile nature of halide exchange in mind, we then explored the ability of P-NPs to catalyze organohalide exchange in Finkelstein like reactions. Results indicate that the P-NPs serve as excellent halide reservoirs for substitution of organohalides in nonpolar media, leading to not only different organohalide products, but also a complementary color change over the course of the reaction, which can be used to monitor kinetics in a precise manner. The merits of using P-NP as spectrochemical probes for real time assaying is then expanded to other anions which can react with, or result in unique, classes of perovskites.

Original languageEnglish (US)
Pages (from-to)5864-5872
Number of pages9
JournalACS Nano
Volume10
Issue number6
DOIs
StatePublished - Jun 28 2016

Keywords

  • anion exchange
  • chemical assay
  • colorimetric
  • CsPbX
  • Finkelstein
  • lead halide
  • nano
  • perovskite
  • spectrochemical

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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