Generic approach for synthesizing asymmetric nanoparticles and nanoassemblies

摘要

A generic route for synthesis of asymmetric nanostructures. This approach utilizes submicron magnetic particles (Fe3O4—SiO2) as recyclable solid substrates for the assembly of asymmetric nanostructures and purification of the final product. Importantly, an additional SiO2 layer is employed as a mediation layer to allow for selective modification of target nanoparticles. The partially patched nanoparticles are used as building blocks for different kinds of complex asymmetric nanostructures that cannot be fabricated by conventional approaches. The potential applications such as ultra-sensitive substrates for surface enhanced Raman scattering (SERS) have been included.

主权项

1. A method of making asymmetric nanostructures with the use of a colloidal magnetic particle as a reactor, comprising:
providing a superparamagnetic core; coating the magnetic core with a shell layer; associating a plurality of a first component with the coated magnetic core; adding a mediation layer, the thickness of the mediation layer being less than the diameter of at least a subset the plurality of first component, each first component in the subset having an exposed portion outside of the mediation layer; modifying each exposed portion; removing the shell layer and mediation layer; and forming the asymmetric nanostructures, which comprise the first component and a second component.