The role of anions and cations in the gas sensing mechanisms of graphene decorated with lead halide perovskite nanocrystals

We report the effects of both anions and cations in lead halide perovskite-graphene hybrids applied to gas sensing. Ultra-fast sensors that can work at room temperature are developed and studied to elucidate the role in the gas sensing mechanisms of different ions in perovskite nanocrystals.This work was supported in part by MICINN and FEDER (grant no. RTI2018-101580-B-I00) and by AGAUR under grant. 2017SGR418. J. C. C. gratefully acknowledges the postdoctoral fellowship from URV. R. G. A. acknowledges the FPI scholarship from MINECO TEC2015-74405-JIN and MAT2015-69669-P. P. A. acknowledges the financial support from the Spanish Government through ‘Severo Ochoa” (SEV-2016-0683, MINECO) and PGC2018-099744-B-I00 (MCIU/AEI/FEDER). E. L. was supported by the Catalan institution for Research and Advanced Studies via the 2018 Edition of the ICREA Academia Award