Effect of localized oxygen functionalization on the conductance of metallic carbon nanotubes

Ashraf, Md. Khalid; Bruque, Nicolas; Pandey, Rajeev R.; Collins, Philip G.; Lake, Roger K.

doi:10.1103/physrevb.79.115428

Cited by 24 publications

(26 citation statements)

References 41 publications

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“…Finally, we note that the ∼20% average conductance drop associated with this single-molecule reaction is consistent with recent experimental work on CBDT-induced defects 25 and that this value is significantly less in amplitude than that obtained by oxidative defect-mediated single-point approaches, 8,13 in agreement with hybrid density functional theory (DFT)/nonequilibrium Green’s function calculations that predict the oxidative method to generate a greater alteration than a single-point chemical bond. 26 …”

Section: Nanowell-confined Chemistry On Carbon Nanotubesmentioning

confidence: 99%

Single-Molecule Reaction Chemistry in Patterned Nanowells

et al. 2016

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A new approach to synthetic chemistry is performed in ultraminiaturized, nanofabricated reaction chambers. Using lithographically defined nanowells, we achieve single-point covalent chemistry on hundreds of individual carbon nanotube transistors, providing robust statistics and unprecedented spatial resolution in adduct position. Each device acts as a sensor to detect, in real-time and through quantized changes in conductance, single-point functionalization of the nanotube as well as consecutive chemical reactions, molecular interactions, and molecular conformational changes occurring on the resulting single-molecule probe. In particular, we use a set of sequential bioconjugation reactions to tether a single-strand of DNA to the device and record its repeated, reversible folding into a G-quadruplex structure. The stable covalent tether allows us to measure the same molecule in different solutions, revealing the characteristic increased stability of the G-quadruplex structure in the presence of potassium ions (K+) versus sodium ions (Na+). Nanowell-confined reaction chemistry on carbon nanotube devices offers a versatile method to isolate and monitor individual molecules during successive chemical reactions over an extended period of time.

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Section: Nanowell-confined Chemistry On Carbon Nanotubesmentioning

confidence: 99%

Single-Molecule Reaction Chemistry in Patterned Nanowells

et al. 2016

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“…[2][3][4] Extensive experimental 1 and theoretical effects 5 have been deployed to unveil novel transport properties. 6 In particular, the ability to modify the nanotube properties through deformation, doping, 7 or the creation of single-and multiple-atom vacancies has attracted considerable attention. 6 In this context it has been shown that electron 8 and ion irradiation 9 can be used to artificially remove individual carbon atoms from SWNTs.…”

Section: Introductionmentioning

confidence: 99%

Atomic vacancy defects in the electronic properties of semi-metallic carbon nanotubes

Zeng

Zhao

et al. 2011

Journal of Applied Physics

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We investigate the electronic properties of semi-metallic (12,0) carbon nanotubes in the presence of a variety of mono-, di-and hexa-vacancy defects, by using first principle DFT combined with non-equilibrium Green's function technique. We show that defect states related to the vacancies hybridize with the extended states of the nanotubes to modify the band edge, and change the energy gap, resulting from the curvature effect. As a consequence, the nanotube conductance is not a monotonic function of the defect size and geometry. Paradoxically, hexa-vacancy nanotubes have higher conductance than di-vacancy nanotubes, which is due to the presence of mid-gap states originating from the defect, thereby enhancing the conductance.

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“…When an oxygen atom is adsorbed, on the graphene surface there occurs slight (5-10%) expansion of the C-C bond, and the angle between C-O bonds is in the range of 60°-70°, which indicates formation of an epoxy structure [15].…”

Section: Adsorption Of Oxygen Atoms On Surfaces Of Nanostructuresmentioning

confidence: 99%

“…In this case, a significant (about 50%) elongation of the C-C bond was observed, which can be considered as its weakening or breakage, and the angle between C-O bonds exceeded 90°. Such a configuration is characteristic of a ether structure [15]. Slanted bonds, oriented at 30° and 0°w ith respect to the axis for armchair and zigzag CNTs, respectively, are characterized by formation of the aforementioned epoxy structure.…”

Section: Adsorption Of Oxygen Atoms On Surfaces Of Nanostructuresmentioning

confidence: 99%