Abstract
Trapping and manipulation of small objects have been of great interest for a range of applications. Here we report on an electrostatic trapping of charged nanoparticle between the aperture of a nanopipette and a glass substrate in an aqueous medium without the need for external potentials. We also demonstrate of a single gold nanoparticle trapped by a scanning aperture can be used as a nano-antenna for plasmonic enhancement of fluorescence in fluidic environment. Our trapping approach with appropriately tailored geometry might allow us to trap and levitate single proteins or macromolecules even in high salt concentrations which could open doors to well-controlled studies at the single-molecule level.
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