DNA Functionalization of Carbon Nanotubes: Application in Device Design Patrick Bennett.

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Presentation transcript:

DNA Functionalization of Carbon Nanotubes: Application in Device Design Patrick Bennett

Nanotubes as FETs: Two Roadblocks Characteristic discrimination Metallic vs. Semiconducting Chirality and diameter Incompatibility with ALD processes1 Lack of functional groups Good for transport properties

Non-covalent DNA functionalization of Nanotubes2 π stacking of nucleotides delocalized molecular orbitals Helical or linear adsorption Binding energy comparable to binding of nanotubes Partial separation via ion exchange chromatography3 High dispersion efficiency Wikipedia

ALD of High-κ Dielectrics4 DNA act as reaction site for ALD Reported oxide thickness with reliable device performance as low as 2nm5 Series capacitance between oxide and nanotube dominated by quantum capacitance 60 mV/decade subthreshold switching (theoretical limit) High Transconductance Ion/Ioff>104 at TOX=2nm

References Farmer, D; Gordon, R. Electrochem. Solid-State Lett. 2005, 8, G89 Zheng, M; Et. Al. Nature Mat. 2003, 2, 338-342 Arnold, M; Et. Al. Nature Nano. 2006, 1, 60-65 Lu, Y; Et. Al. J. Am. Chem. Soc. 2006, 128, 3518-3519 Javey, A; Et. Al. Nature Mat. 2002, 1, 241-246