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Black hollow silicon oxide nanoparticles as highly efficient photothermal agents in the second near-infrared window for in vivo cancer therapy.
Biomaterials 2017 October
Semiconductor nanoparticles with localized surface plasmon resonance (LSPR) have gained increasing interest due to their potential for use in nanomedicine, particularly in the area of cancer photothermal therapy. In this study, we have synthesized non-stoichiometric hollow silicon oxide nanoparticles (H-SiOx NPs) using a magnesiothermic reduction process. The black NPs generated a desired LSPR in the second near-infrared (NIR-II) window, as was demonstrated by a photothermal conversion efficiency of up to 48.6% at 1064 nm. Such an efficiency is the highest reported among the noble metal and semiconductor-based NPs as NIR-II PTT photothermal agents. In addition, H-SiOx NPs exhibited excellent in vivo photoacoustic (PA) imaging properties, and thus can be used for highly efficient in vivo cancer treatment via irradiation with a 1064 nm laser, even at 0.6 W cm-2 . The findings described are the first to demonstrate the existence of LSPR in non-stoichiometric silicon-based nanoparticles with a low-toxicity degradation pathway for in vivo application, and provide new insights towards understanding the role of new semiconductor nanoparticles in nanomedicine.
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