A tough shell for nanoparticles

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Science  23 Oct 2015:
Vol. 350, Issue 6259, pp. 395-396
DOI: 10.1126/science.350.6259.395-b

Nanoparticles made from compound semiconductors such as cadmium sulfide (CdS) can exhibit useful luminescent properties but can also be unstable with respect to ambient air and humidity, especially under conditions of strong illumination. Li et al. show that the passivation of metals by forming self-protecting oxides can be extended to nanoparticles. They added aluminum isopropoxide to the reaction mixture for synthesizing particles 8 nm in diameter, with a cadmium selenide core and a CdS shell. The aluminum dopant was transformed into a protective aluminum oxide coating that greatly improved photoprotection against blue light.

J. Am. Chem. Soc. 10.1021/jacs.5b05462 (2015).

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