title: Carbon nanotube-DNA nanoarchitectures and electronic functionality.
abstract: Biological molecules such as deoxyribonucleic acid (DNA) possess inherent recognition and self-assembly capabilities, and are attractive templates for constructing functional hierarchical material structures as building blocks for nanoelectronics. Here we report the assembly and electronic functionality of nanoarchitectures based on conjugates of single-walled carbon nanotubes (SWNTs) functionalized with carboxylic groups and single-stranded DNA (ssDNA) sequences possessing terminal amino groups on both ends, hybridized together through amide linkages by adopting a straightforward synthetic route. Morphological and chemical-functional characterization of the nanoarchitectures are investigated using scanning electron microscopy, transmission electron microscopy, atomic force microscopy, energy-dispersive X-ray spectroscopy, Raman spectroscopy, and Fourier-transform infrared spectroscopy. Electrical measurements (I-V characterization) of the nanoarchitectures demonstrate negative differential resistance in the presence of SWNT/ssDNA interfaces, which indicates a biomimetic route to fabricating resonant tunneling diodes. I-V characterization on platinum-metallized SWNT-ssDNA nanoarchitectures via salt reduction indicates modulation of their electrical properties, with effects ranging from those of a resonant tunneling diode to a resistor, depending on the amount of metallization. Electron transport through the nanoarchitectures has been analyzed by density functional theory calculations. Our studies illustrate the great promise of biomimetic assembly of functional nanosystems based on biotemplated materials and present new avenues toward exciting future opportunities in nanoelectronics and nanobiotechnology.
authors.affiliation: Department of Chemical Engineering, University of California, Riverside, CA 92521, USA.
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.forename: Fei
authors.initials: F
authors.lastname: Liu
authors.forename: G T Senthil
authors.initials: GT
authors.lastname: Andavan
authors.forename: Xiaoye
authors.initials: X
authors.lastname: Jing
authors.forename: Krishna
authors.initials: K
authors.lastname: Singh
authors.forename: Vahid R
authors.initials: VR
authors.lastname: Yazdanpanah
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bruque
authors.forename: Rajeev R
authors.initials: RR
authors.lastname: Pandey
authors.forename: Roger
authors.initials: R
authors.lastname: Lake
authors.forename: Mihrimah
authors.initials: M
authors.lastname: Ozkan
authors.forename: Kang L
authors.initials: KL
authors.lastname: Wang
authors.forename: Cengiz S
authors.initials: CS
authors.lastname: Ozkan
mesh_terms: D004247:DNA / Q000737:chemistry*; D004277:DNA, Single-Stranded / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods; D004581:Electronics; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D008962:Models, Theoretical; D053758:Nanoparticles; D036103:Nanotechnology / Q000379:methods; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013059:Spectrum Analysis, Raman; D013696:Temperature
chemical_list: D004277:DNA, Single-Stranded; D037742:Nanotubes, Carbon; D010984:Platinum; D004247:DNA