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. 2021 Jun 4;6(23):15236–15245. doi: 10.1021/acsomega.1c01491

Figure 3.

Figure 3

(a) FT-IR spectra of SWUCNPs capped with OA molecules and PAA molecules. (b) Upconversion fluorescence spectra of SWUCNPs and the UV–vis absorption spectra of GO. (c) TEM images of PAA-capped SWUCNPs and (d) complex of GO (0.1 mg mL–1) and UCNP-Apt (0.05 mg mL–1).