Ligand-free metal halide microcrystals with superior stability and gas sensing capability

Aikaterini Argyrou^a^,^b, Konstantinos Brintakis^a, Athanasia Kostopoulou^a, Emmanouel Stratakis^a^,^c

^aInstitute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Greece

^bDepartment of Chemistry, University of Crete, Voutes, Heraklio, 71003, Greece

^cDepartment of Physics, University of Crete,, Heraclión, Grecia, Crete, Greece

Materials for Sustainable Development Conference (MATSUS)
Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)

#PerEmer20. Perovskite III: Emerging Metal Halide Semiconductors

Online, Spain, 2020 October 20th - 23rd

Organizers: Dmitry Dirin, Jacky Even and Constantinos Stoumpos

Contributed talk, Aikaterini Argyrou, presentation 141
Publication date: 4th October 2020

Over the past few years, gas sensors have been an integral part for various aspects of our lives due to their ability to detect and monitor toxic and hazardous air pollutants.[1] Recently, all-inorganic lead halide nanostructures have emerged in gas sensing research since they can reversibly transduce any environmental stimuli into optical or electrical signal. Herein, we present the sensing performance of ligand-free all-inorganic CsPbBr₃ microcrystals as self-powered ozone and hydrogen sensing elements with remarkable stability over time. In particular, cubic-like shaped crystals were fabricated by a cost-effective solution-based process, directly grown on electrodes and were characterized by electrical measurements under different gas concentrations, at room temperature working conditions. Different synthesis parameters have been evaluated to optimize the sensing capability of the formed materials.[2] The sensors incorporating such novel materials as sensing components displayed quick detection and short restoration times and exhibited significantly high sensitivity under ultra-low ozone and hydrogen concentrations down to 4 ppb and 1 ppm respectively. Additionally, the great repeatability of the sensing process could provide new opportunities in gas sensing applications.

References:

[1] Gagaoudakis, E.; Panagiotopoulos, A,; Maksudov, T.; Moschogiannaki, M.; Katerinopoulou, D.; Kakavelakis, G.; Kiriakidis, G.; Binas, V.; Kymakis, E.; Petridis, K. Self-powered, flexible and room temperature operated solution processed hybrid metal halide p-type sensing element for efficient hydrogen detection. J. Phys. Mater. 2020, 3, 014010

[2] Brintakis, K.; Gagaoudakis, E.; Kostopoulou, A.; Faka, V.; Argyrou, A.; Binas, V.; Kiriakidis, G.; Stratakis, E. Ligand-free all-inorganic metal halide nanocubes for fast, ultra-sensitive and self-powered ozone sensors. Nanoscale Adv. 2019, 1, 2699-2706

Acknowledgements:

A.K. thanks General Secretariat for Research and Technology (GSRT) and Hellenic Foundation for Research and Innovation (HFRI) under the contract number 1179 for funding.

This research has been co‐financed through the Operational Programme Competitiveness, Entrepreneurship and Innovation , under the call FLAGERA Joint Transnational Call 2019 for transnational research projects in synergy with the two FET Flagships Graphene Flagship & Human Brain Project - ERA-NETS 2019b (PeroGaS: T11EPA4-00045)

This research has been co‐financed through the Operational Programme Competitiveness, Entrepreneurship and Innovation, under the call Bilateral and Multilateral RTD cooperation between Greece and Israel, (project code:Τ5ΔΙΣ-00190).

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