Plenty of researches about chiral noble metals Au and Ag and some of chiral II-VI semiconductors like CdS, CdSe, CdTe and PbTe have been reported and paid attentions. While no ceramic NPs have been reported till now in terms of the chiral property, which have favorable applications in catalysis, optical properties and biomedical science. Here we are the first to report chiral ceramic NPs with interesting near infrared (NIR) chiroptical activities. Chiral capping ligands L/D-aspartic acid introduced chirality in achiral tungsten oxide nanoparticles with oxygen vacancy (WO3-x NPs), a kind of ceramic NPs. As-prepared WO3-x NPs exhibit a broad NIR absorption and circular dichroism (CD) spectra (800-1200nm). Interestingly, it showed enhanced absorption and CD signal simultaneously with adding water or exposed in air. The appropriate amount of water (0.04V/V%--0.20 V/V% water in sample) or humidity of air can cause coloration and enhancement of absorption and CD signal. The as-prepared chiral WO3-x open up the possibility of effective medicine delivery acting as a carrier to cancer cells and subsequent laser photothermal therapy to kill tumor as WO3-x can absorb NIR light and transfer to heat effectively.

Chiral ceramic nanoparticles

251st National Meeting (2016)

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