The Role of pH in PEG-b-PAAc Modification of Gadolinium Oxide Nanostructures for Biomedical Applications
(a) Upconversion (=980 nm, =600 mW) and NIR (=980 nm, =100 mW) emission of ParticlesHP-CTAB (A) and Rods5 (B) (Similar spectra have been obtained for all other samples). (b) Ratio between the red and green emission intensities. (c) Normalized FT-IR spectra recorded on (A) ParticlesEP, (B) ParticlesAP, (C) ParticlesHP-CTAB, (D) Rods5 and (E) Rods12. (d) Peak area at 3500 cm−1 representing the hydroxyl content of the samples.