Correction: Optical humidity sensors based on lead-free Cu-based perovskite nanomaterials (Nanoscale Adv. (2022) 4 (3309-3317) DOI: 10.1039/D2NA00168C)

The authors regret that the funding information was incorrectly shown in the acknowledgements section of the original manuscript. The authors wish to replace the grant number, “NRF-2021M2D2A1A0204148211”, with “NRF-2021M2D2A1A02041482”. The corrected funding acknowledgement is as shown below. S.-K. K. acknowledges the support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2021M2D2A1A02041482). The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.