Carbon Nanotube–DNA Nanoarchitectures and Electronic Functionality
Autor: | Krishna V. Singh, Cengiz S. Ozkan, Rajeev R. Pandey, V. R. Yazdanpanah, G. T. Senthil Andavan, Xiaoye Jing, Xu Wang, Nicolas Bruque, Kang L. Wang, Fei Liu, Roger K. Lake, Mihrimah Ozkan |
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Rok vydání: | 2006 |
Předmět: |
Materials science
DNA Single-Stranded Nanotechnology Carbon nanotube Microscopy Atomic Force Spectrum Analysis Raman law.invention Biomaterials Microscopy Electron Transmission law Spectroscopy Fourier Transform Infrared Microscopy Electrochemistry Nanobiotechnology General Materials Science Electrical measurements Platinum chemistry.chemical_classification Nanotubes Carbon Biomolecule Temperature Molecular electronics DNA General Chemistry Models Theoretical Characterization (materials science) Nanoelectronics chemistry Nanoparticles Electronics Biotechnology |
Zdroj: | Small. 2:1356-1365 |
ISSN: | 1613-6829 1613-6810 |
Popis: | 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. |
Databáze: | OpenAIRE |
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