Figure 3.

FTIR spectra of UCNP samples: (a) IL-UCNPs, (b) Cit-UCNPs, (c) SDS-UCNPs, (d) DDBAC-UCNPs, and (e) PEG-UCNPs.

Zhou et al. Nanoscale Research Letters 2013 8:518   doi:10.1186/1556-276X-8-518
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