Liquid-like cationic sub-lattice in copper selenide clusters

Sarah L. White, Progna Banerjee, Prashant Jain

Research output: Contribution to journalArticle

Abstract

Super-ionic solids, which exhibit ion mobilities as high as those in liquids or molten salts, have been employed as solid-state electrolytes in batteries, improved thermoelectrics and fast-ion conductors in super-capacitors and fuel cells. Fast-ion transport in many of these solids is supported by a disordered, 'liquid-like' sub-lattice of cations mobile within a rigid anionic sub-lattice, often achieved at high temperatures or pressures via a phase transition. Here we show that ultrasmall clusters of copper selenide exhibit a disordered cationic sub-lattice under ambient conditions unlike larger nanocrystals, where Cu+ ions and vacancies form an ordered super-structure similar to the bulk solid. The clusters exhibit an unusual cationic sub-lattice arrangement wherein octahedral sites, which serve as bridges for cation migration, are stabilized by compressive strain. The room-temperature liquid-like nature of the Cu+ sub-lattice combined with the actively tunable plasmonic properties of the Cu2 Se clusters make them suitable as fast electro-optic switches.

Original languageEnglish (US)
Article number14514
JournalNature communications
Volume8
DOIs
StatePublished - Feb 20 2017

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copper selenides
Copper
Ions
Cations
Liquids
liquids
Temperature
Phase Transition
Ion Transport
ions
Nanoparticles
Electrolytes
Electrooptical effects
cations
Salts
Crystal lattices
Nanocrystals
molten salts
Vacancies
Molten materials

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Liquid-like cationic sub-lattice in copper selenide clusters. / White, Sarah L.; Banerjee, Progna; Jain, Prashant.

In: Nature communications, Vol. 8, 14514, 20.02.2017.

Research output: Contribution to journalArticle

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