Fig. 2: Spectroscopic verification of the Pb-S bonding between the PQDs and silica shell.
From: Water-resistant perovskite nanodots enable robust two-photon lasing in aqueous environment
a Powder XRD spectra of wr-PNDs, PQDs, and SiO2 nanospheres. b FTIR spectra of wr-PNDs powder (red), MPTMS solution (blue). c, d XPS of Pb (4f) and S (4p) regions in wr-PNDs. Source data are provided as a Source Data file.
