Figure 6 | Scientific Reports

Figure 6

From: Silane modified upconversion nanoparticles with multifunctions: imaging, therapy and hypoxia detection

Figure 6

(a) The absorption spectra of UCNPs@PtOEP@silane with different amounts of PtOEP. (b) The emission spectra of UCNPs@PtOEP@silane with different amounts of PtOEP (under 532 nm excitation). (c) Response of UCNPs@PtOEP@silane towards various concentrations of oxygen at room temperature. The inset is the Stern-Volmer plot. (d) Reversibility of UCNPs@PtOEP@silane responding to dissolved oxygen. The fluorescence ratios are plotted versus the experimental time.

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