Ligand-free all-inorganic metal halide nanocubes for fast, ultra-sensitive and self-powered ozone sensors

K Brintakis; E Gagaoudakis; A Kostopoulou; V Faka; A Argyrou; V Binas; G Kiriakidis; E Stratakis

doi:10.1039/c9na00219g

Ligand-free all-inorganic metal halide nanocubes for fast, ultra-sensitive and self-powered ozone sensors

Nanoscale Adv. 2019 May 22;1(7):2699-2706. doi: 10.1039/c9na00219g. eCollection 2019 Jul 10.

Authors

K Brintakis¹, E Gagaoudakis^{1

2}, A Kostopoulou¹, V Faka^{1

2

3}, A Argyrou^{1

3}, V Binas^{1

2

4}, G Kiriakidis^{1

2}, E Stratakis^{1

2}

Affiliations

¹ Institute of Electronic Structure & Laser (IESL), Foundation for Research and Technology (FORTH) Hellas P.O. Box 1385 Heraklion 70013 Crete Greece akosto@iesl.forth.gr stratak@iesl.forth.gr.
² University of Crete, Department of Physics 710 03 Heraklion Crete Greece.
³ University of Crete, Department of Materials Science and Technology 710 03 Heraklion Crete Greece.
⁴ Crete Center for Quantum Complexity and Nanotechnology, Department of Physics, University of Crete 71003 Heraklion Greece.

Abstract

Ligand-free all-inorganic lead halide nanocubes have been investigated as ozone sensing materials operating at room temperature. It is found that the nanocubes, crystallined in the orthorhombic CsPbBr₃ structure, can operate at room temperature, be self-powered and exhibit high sensitivity and remarkable repeatability. More importantly, they demonstrate higher sensitivity (54% in 187 ppb) and faster response and recovery times compared to hybrid lead mixed halide perovskite (CH₃NH₃PbI_3-x Cl _x ) layers, which is the only lead halide perovskite material tested for ozone sensing, to date. Following the exposure to an ozone environment, the stoichiometry and the morphology of the nanocubes remain unaltered. The facile and easy fabrication process together with the high responsivity and stability to the ozone environment makes the bare CsPbBr₃ nanocubes a promising material for sensing applications. The sensing properties of the nanoparticulate metal halides presented here provide new exciting opportunities towards engineering reliable and cheap sensing elements for room-temperature operated and self-powered sensors.