2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Single Walled Carbon Nanotubes based Ionic Building Blocks for Nanoelectronic Devices

Y. Yadav, S. Prasad
Portland State University, US

Keywords:
Ionic building blocks, microcontact printing, crossbar ionic nanodevices

Abstract:
We present electrical characterization of crossbar ionic nanodevices built using surfactant coated single walled carbon nanotubes (SWCNT’s) via microcontact printing. These nanotube ionic building blocks were synthesized using intrinsic semiconducting SWCNT’s doped with surfactant molecules, thereby altering the Fermi energy level of SWCNT’s and their electrical properties. The surfaces of extrinsic SWCNT’s, were modified by surfactants; sodium dodecyl sulfate (SDS) and cetyl trimethylammonium bromide (CTAB), having Na+ positive ionic charge (anions) and Br- negative ionic charge (cations) on its hydrophilic ends respectively to produced anionic SWCNT’s (P-type) and cationic SWCNT’s (N-type) respectively. Double patterning process, was then adopted and these anionic and cationic SWCNT ionic blocks were alternatively symmetrically patterned into a parallel array to form crossbar P-N junctions using flexible polymeric poly-dimethylsiloxane (PDMS) stamps. Parallel alignment of SWCNT’s was achieved, due to the transfer of the inked SWCNT’s from the PDMS relief structure onto the microelectrode array, which serves as the base platform for measuring the electrical characteristics. Functionality of nanodevices was demonstrated by studying current – voltage (I-V) characteristics that shows promise towards formation of a nanoelectronic diode array, which can potentially be used for integrating complex logic devices for high-end applications such as memory module and addressable logic.


Nanotech 2008 Conference Program Abstract