Production of semiconducting gold–DNA nanowires by application of DC bias

Joshi, Rakesh; West, Leigh A.; Kumar, Amrita; Joshi, Nidhi; Alwarappan, Subbiah; Kumar, Ashok

doi:10.1088/0957-4484/21/18/185604

Cited by 6 publications

(4 citation statements)

References 39 publications

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“…This is less than 20 times higher than the resistivity of bulk gold (ρ bulk gold = 2.05 × 10 −8 m measured at room temperature [36]). This value is significantly lower than previously reported resistivities of gold nano-wires created using different bio-templates, which are typically two orders of magnitude higher than bulk gold [5,30,37,38]. We note that the real resistivity is likely to be significantly lower than the upper limit determined above, given that the contact resistances are in fact not negligible.…”

Section: Electrical Characterization Of the Nano-wirescontrasting

confidence: 64%

Fabrication and characterization of gold nano-wires templated on virus-like arrays of tobacco mosaic virus coat proteins

et al. 2012

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The rod-shaped plant virus tobacco mosaic virus (TMV) is widely used as a nano-fabrication template, and chimeric peptide expression on its major coat protein has extended its potential applications. Here we describe a simple bacterial expression system for production and rapid purification of recombinant chimeric TMV coat protein carrying C-terminal peptide tags. These proteins do not bind TMV RNA or form disks at pH 7. However, they retain the ability to self-assemble into virus-like arrays at acidic pH. C-terminal peptide tags in such arrays are exposed on the protein surface, allowing interaction with target species. We have utilized a C-terminal His-tag to create virus coat protein-templated nano-rods able to bind gold nanoparticles uniformly. These can be transformed into gold nano-wires by deposition of additional gold atoms from solution, followed by thermal annealing. The resistivity of a typical annealed wire created by this approach is significantly less than values reported for other nano-wires made using different bio-templates. This expression construct is therefore a useful additional tool for the creation of chimeric TMV-like nano-rods for bio-templating.

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Section: Electrical Characterization Of the Nano-wirescontrasting

confidence: 64%

Fabrication and characterization of gold nano-wires templated on virus-like arrays of tobacco mosaic virus coat proteins

et al. 2012

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“…From this and (15) it follows that the energy flux through the n-th cross section has the following simple form:…”

Section: Heat Conductivity Of the Double Helixmentioning

confidence: 99%

“…Deoxyribonucleic acid (DNA) is one of the most promising nanowire materials due to the relative ease of modifications combined with the self-assembly capability which make it possible to construct a great variety of DNA-based nanostructures [14,15]. While electrical conductivity of single DNA molecules has been extensively studied, the corresponding thermal properties remain largely unexplored.…”

Section: Introductionmentioning

confidence: 99%

Heat conductivity of the DNA double helix

et al. 2011

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Thermal conductivity of isolated single molecule DNA fragments is of importance for nanotechnology, but has not yet been measured experimentally. Theoretical estimates based on simplified (1D) models predict anomalously high thermal conductivity. To investigate thermal properties of single molecule DNA we have developed a 3D coarse-grained (CG) model that retains the realism of the full all-atom description, but is significantly more efficient. Within the proposed model each nucleotide is represented by 6 particles or grains; the grains interact via effective potentials inferred from classical molecular dynamics (MD) trajectories based on a well-established all-atom potential function. Comparisons of 10 ns long MD trajectories between the CG and the corresponding all-atom model show similar root-mean-square deviations from the canonical B-form DNA, and similar structural fluctuations. At the same time, the CG model is 10 to 100 times faster depending on the length of the DNA fragment in the simulation. Analysis of dispersion curves derived from the CG model yields longitudinal sound velocity and torsional stiffness in close agreement with existing experiments. The computational efficiency of the CG model makes it possible to calculate thermal conductivity of a single DNA molecule not yet available experimentally. For a uniform (polyG-polyC) DNA, the estimated conductivity coefficient is 0.3 W/mK which is half the value of thermal conductivity for water. This result is in stark contrast with estimates of thermal conductivity for simplified, effectively 1D chains (”beads on a spring”) that predict anomalous (infinite) thermal conductivity. Thus, full 3D character of DNA double-helix retained in the proposed model appears to be essential for describing its thermal properties at a single molecule level.

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“…These pairs are randomly distributed along the DNA double strand. Due to its relative ease of modification and self-assembly capability which make the construction of numerous DNA-based nanostructures possible, DNA is one of the most promising nanowire materials (Endo and Sugiyama (2009); Joshi et al (2010)). From a technological standpoint, the transfer of charge and excitation in the DNA molecule are of clear interest in the developing area of DNA-based artificial nanostructures for nanophotonic and nanoelectronic applications (Stulz (2012)).…”

Section: Introductionmentioning

confidence: 99%

Mechanical response of double-stranded DNA to dynamic excitation

Mousavi

Mirzaei

Jalilvand

2021

Journal of Vibration and Control

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The present work investigates the vibrational properties of a DNA-like structure by means of a harmonic Hamiltonian and the Green’s function formalism. The DNA sequence is considered as a quasi one-dimensional system in which the mass-spring pairs are randomly distributed inside each crystalline unit. The sizes of the units inside the system are increased, in a step-by-step approach, so that the actual condition of the DNA could be modeled more accurately. The linear-elastic forces mimicking the bonds between the pairs are initially considered constant along the entire length of the system. In the next step, these forces are randomly shuffled so as to take into account the inherent randomness of the DNA. The results reveal that increasing the number of mass-spring pairs in the crystalline structure decreases the influence of randomness on the mechanical behavior of the structure. This also holds true for systems with larger crystalline units. The obtained results can be used to investigate the mechanical behavior of similar macro-systems.

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Production of semiconducting gold–DNA nanowires by application of DC bias

Cited by 6 publications

References 39 publications

Fabrication and characterization of gold nano-wires templated on virus-like arrays of tobacco mosaic virus coat proteins

Fabrication and characterization of gold nano-wires templated on virus-like arrays of tobacco mosaic virus coat proteins

Heat conductivity of the DNA double helix

Mechanical response of double-stranded DNA to dynamic excitation

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