Journal
NANOSCALE
Volume 10, Issue 42, Pages 19898-19905Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr05552a
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Funding
- National Natural Science Foundation of China [21573185, 51332008]
- Research Grants Council of Hong Kong [CityU 11208215]
- City University of Hong Kong [7004650, 9667171]
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A new class of core-satellite upconversion nanoparticles (UCNPs) formed through a kinetically controlled oriented attachment is presented. The core-satellite UCNPs comprising an optically active alpha-NaYbF4 core and several CaF2 satellites are synthesized by a one-pot sequential injection technique. Compared to conventional core-shell UCNPs, these core-satellite UCNPs show larger surface-to-volume ratios and are suitable for further surface modifications. As a proof-of-concept, a biosensing system is constructed by coating MnO2 nanosheets on the alpha-NaYbF4:Tm@CaF2 core-satellite UCNPs for high-sensitivity biothiol detection. These core-satellite UCNPs show great potential in the development of UCNP-based nanohybrids for biosensing, multimodal imaging and drug delivery.
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