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. 2016 Oct 1;11:441. doi: 10.1186/s11671-016-1651-y

Fig. 3.

Fig. 3

a The TGA curves of NaYF4:Yb,Er NPs. a OA-capped samples, b OA-free samples. b FTIR absorption spectra of as-prepared NaYF4:Yb, Er NPs before and after removing OA layer. a OA, b OA-capped samples, c OA-free samples