Fig. 2: Characterization of STPNs. | Nature Communications

Fig. 2: Characterization of STPNs.

From: Pre-activated nanoparticles with persistent luminescence for deep tumor photodynamic therapy in gallbladder cancer

Fig. 2

a TEM image of UCNP (i), STPNs at pH 7.4 (ii), and STPNs at pH 5.5 (iii) (scale bar = 100 nm). b STPNs zeta potential changes at different pH. c STPNs particle size distribution at different pH. d Pu18 fluorescence intensity from STPNs at different pH (λex = 400 nm, λem = 675 nm). e STPNs pH-dependent transmittance changes; Inset: STPNs photographs at different pH. f Pu18 absorbance spectrum and UCNP UCL spectrum. g STPNs DPBF absorbance spectrum changes under 980 nm laser irradiation at pH 5.5. h pH-dependent DPBF absorbance of STPNs and SPLs under 980 nm laser irradiation at different pH. i STPNs (pH 5.5) 1O2 generation after 5 min of 980 or 650 nm laser irradiation (2.0 W cm−2). j Afterglow luminescence decay of STPNs (pH 5.5) at room temperature after 5 min of 980 nm laser irradiation (2.0 W cm−2). The data are represented as mean ± SD (n = 3 independent experiments).

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