Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 20, Issue 21, Pages 3701-3706Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201001201
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Funding
- National Basic Research Program of China [2010CB934700]
- International Science & Technology Cooperation Program [2010DFA41170]
- National Natural Science Foundation of China (NSFC) [50732006, 91022032]
- National Synchrotron Radiation Laboratory at the University of Science and Technology of China (USTC)
- Innovation Research Program of USTC
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Multicomponent Ni7Co3 alloy-Au nanorings can be facilely synthesized at room temperature using metallic Ni7Co3 alloy nanorings as both reducing agent and sacrificial template in water. These novel alloy-Au hybrid nanorings are well biocompatible due to coating with poly(vinylpyrrolidone) and gold nanoparticles. When increasing the molar ratio of alloy to gold salt from 1:1 to 5:1, the number of the gold nanoparticles loaded on the surface of alloy nanorings were found to be decreased, and their morphology was transformed from rod to particle, remaining the ring-like assemblies. Their saturation magnetization increased due to the ring-like assemblies, resulting in the enhancement of the signal intensity in Spin-spin relaxation time (T-2) weighted magnetic resonance imaging measurement. These alloy-Au hybrid nanocomposites can perform as multimodal imaging contrast agents for cancer cell diagnosis by two-photon fluorescent imaging and T-2-weighted magnetic resonance imaging. In addition, their potential application for photothermal therapy was preliminarily investigated.
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