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A scanning tip electrospinning source for deposition of oriented nanofibres

Jun Kameoka1, Reid Orth1, Yanou Yang1, David Czaplewski1, Robert Mathers2, Geoffrey W Coates2 and H G Craighead1

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We present a method for controlled deposition of oriented polymeric nanofibres. The method uses a microfabricated scanned tip as an electrospinning source. The tip is dipped in a polymer solution to gather a droplet as a source material. A voltage applied to the tip causes the formation of a Taylor cone, and at sufficiently high voltages, a polymer jet is extracted from the droplet. By moving the source relative to a surface, acting as a counter-electrode, oriented nanofibres can be deposited and integrated with microfabricated surface structures. For example, we deposited fibres of polyethylene oxide with diameters ranging from 100 to 1800 nm, with the diameter primarily depending on the concentration of the polymeric solution. In addition to the uniform fibre deposition, the scanning tip electrospinning source can produce self-assembled composite fibres of micro-and nanoparticles aligned in a polymeric fibre. We also deposited oriented conductive polymeric fibres of polyaniline and investigated the conductivity of these fibres as components for polymeric nanoelectronics.


PACS

73.63.-b Electronic transport in nanoscale materials and structures

81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials

81.07.-b Nanoscale materials and structures: fabrication and characterization

72.80.Le Polymers; organic compounds (including organic semiconductors)

81.16.Dn Self-assembly

Subjects

Soft matter, liquids and polymers

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Nanoscale science and low-D systems

Dates

Issue 10 (October 2003)

Received 21 March 2003, in final form 17 June 2003

Published 5 September 2003



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