Journal article

Detection of Halomethanes Using Cesium Lead Halide Perovskite Nanocrystals

Wenping Yin, Hanchen Li, Anthony SR Chesman, Ben Tadgell, Andrew D Scully, Mingchao Wang, Wenchao Huang, Christopher R McNeill, Wallace WH Wong, Nikhil Medhekar, Paul Mulvaney, Jacek J Jasieniak

ACS NANO | AMER CHEMICAL SOC | Published : 2021

Abstract

The extensive use of halomethanes (CH3X, X = F, Cl, Br, I) as refrigerants, propellants, and pesticides has drawn serious concern due to their adverse biological and atmospheric impact. However, there are currently no portable rapid and accurate monitoring systems for their detection. This work introduces an approach for the selective and sensitive detection of halomethanes using photoluminescence spectral shifts in cesium lead halide perovskite nanocrystals. Focusing on iodomethane (CH3I) as a model system, it is shown that cesium lead bromide (CsPbBr3) nanocrystals can undergo rapid (<5 s) halide exchange, but only after exposure to oleylamine to induce nucleophilic substitution of the CH3..

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Grants

Awarded by Australian Research Council


Awarded by Australia Research Council - Centre of Excellence in Exciton Science


Funding Acknowledgements

This research was supported financially by the Australia Research Council funded Centre of Excellence in Exciton Science (Grant CE170100026). The authors acknowledge the technical contributions of Australian Defence Science and Technology Group (DSTG), particularly the assistance and advice of Genevieve H. Dennison. W.H. acknowledges an ACAP fellowship supported by the Australian Government through the Australian Renewable Energy Agency (ARENA). The authors acknowledge use of the facilities and the assistance of Jisheng Ma and James Griffith at the Monash X-ray Platform. M.W. and N.M. gratefully acknowledge the support from the Australian Research Council (DP166103661) and thank Monash Computing Cluster, National Computing Infrastructure, and Pawsey Supercomputing Facility for the use of computational facilities. The authors also acknowledge use of the facilities at Monash Centre for Electron Microscopy (MCEM). In addition, this work was performed in part at the SAXS/WAXS beamline at the Australian Synchrotron, part of ANSTO.