397148 Optoelectric Trapping and Manipulation of Metal Nanoparticles

Monday, November 17, 2014: 5:20 PM
Marquis Ballroom C (Marriott Marquis Atlanta)
Avanish Mishra, Purdue University, West Lafayette, IN, Stuart J. Williams, Mechanical Engineering, University of Louisville, Louisville, KY and Steven T. Wereley, Birck Nanotechnology Center, Purdue University, West Lafayette, IN

Noninvasive particle grippers are highly desired in nanomanufacturing and bio-microfluidics. Rapid Electrokinetic Patterning (REP) provides such functionality by combining AC electric field and laser induced heating on an electrode surface. In this technique, a colloidal solution containing nanoparticles is supplied between two planar transparent indium tin oxide (ITO) electrodes. Application of an AC electric field and the projection of a 1064 nm infrared beam on one of the electrode surfaces results in a toroidal electrothermal vortex which transports particles close to the electrode surface where the particles are reversibly trapped by electrode-particle interactions. We show that the metal nanoparticles such as gold and silver nanospheres (40-200 nm) and multi-wall carbon nanotubes can be trapped and manipulated using this method. We demonstrate application of REP induced aggregation in sensitive chemical detection with Surface Enhanced Raman Spectroscopy (SERS).

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