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Laser Guidance Deposition Technique for Patterning Microstructures Made of Nanoparticles with Varying Surface Functionality

Published online by Cambridge University Press:  01 February 2011

Juntao Xu ,
Changgong Zhou ,
Sheila Grant ,
Edward Nadgorny  and
Jaroslaw Drelich
Juntao Xu
Affiliation:
Department of Materials Science and Engineering and Department of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931
Changgong Zhou
Affiliation:
Department of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931
Sheila Grant
Affiliation:
Department of Biological Engineering, University of Missouri-Columbia, Columbia, MO 65211
Edward Nadgorny
Affiliation:
Department of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931
Jaroslaw Drelich
Affiliation:
Department of Materials Science and Engineering and Department of Physics, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931
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Abstract

We present results on patterning microstructures using laser-guidance deposition of nanoparticles from particle-in-solvent suspensions. A laser beam axially confines and propels the particles inside a hollow optical fiber towards a substrate. Confining is provided by the gradient forces arising from light refraction or electrical forces on polarizable particles. The driving force results from the momentum conservation of photons scattered on particles. Polystyrene particles (100 and 400 nm in diameter) and gold particles (from 8 to 50 nm) with different surface organic functionality serve as a constructive material for fabrication of microstrips. In the experiments, the laser power varies from 0.1 to 1.6 W. The microstrips produced under different deposition conditions are studied using optical microscopy and atomic force microscopy. It was found that deposited polystyrene and gold particles form nanoclusters consisting of at least several particles. If deposited at an appropriate rate, such nanoclusters form multilayer microstrips of high particle density. The typical width of the microstrips ranges from less than 10 microns to 100 microns. This technique allows us to fabricate parallel arrays made of colloidal particles with different surface functionality, which seems to be an especially attractive approach for developing novel chemical and biological microsensors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 728: Symposium S – Functional Nanostructured Materials through Multiscale Assembly and Novel Patterning Techniques , 2002 , S7.6
Copyright
Copyright © Materials Research Society 2002

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