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. 2021 Sep 18;22(18):10116. doi: 10.3390/ijms221810116

Figure 1.

Figure 1

Quantum dot (QD) classification: (a) Single QD coated SiO2 shell [13], (b) Multiply QD-doped SiO2 nanoparticle [30], (c) Template-based multi-QDs [31].