Optical characterization of DNA-wrapped carbon nanotube hybrids

Chou, S. G.; Ribeiro, Henrique B.; Barros, Eduardo B.; Santos, Adelina P.; Nezich, Daniel; Samsonidze, Ge. G.; Fantini, C.; Pimenta, M. A.; Jório, Ado; Filho, F. Plentz; Dresselhaus, M. S.; Dresselhaus, G.; Saito, Riichiro; Zheng, Ming; Onoa, G. Bibiana; Semke, E. D.; Swan, Anna K.; Ünlü, M. Selim; Goldberg, Bennett B.

doi:10.1016/j.cplett.2004.08.117

Cited by 126 publications

(81 citation statements)

References 12 publications

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“…DNA interaction with CNT and graphene 3.1 Adsorption of ssDNA and dsDNA on CNT Nucleic acids such as ssDNA and dsDNA adsorption on CNT have been studied by several groups that have found promising applications in CNT separation and sensors within cells (Zheng et al 2003a;Zheng et al 2003b;Chou et al 2004;Heller et al 2006;Zhao and Johnson 2007; et al 2008). In contrast, not much attention has been paid to study the interaction of siRNA with CNTs.…”

Section: Effect Of Ethanol On A-to B-dna Transitionmentioning

confidence: 99%

“…Specific protein binding to the native B-DNA can trigger the transition from B-to A-or Z-DNA and stabilize the A-DNA and/ or Z-DNA form (Jacobomolina et al 1993;Kiefer et al 1998;Jones et al 1999;Lu et al 2000). ssDNA and dsDNA interactions with CNTs have been studied by several groups which have found promising applications in CNT separation and sensing within cells (Zheng et al 2003a;Zheng et al 2003b;Chou et al 2004;Heller et al 2006;Johnson et al 2008;Zhao and Johnson 2007). However, it is not yet known whether CNTs or graphene can induce B-to A-or Z-DNA transition.…”

Section: Introductionmentioning

confidence: 99%

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Interaction of nucleic acids with carbon nanotubes and dendrimers

2012

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Nucleic acid interaction with nanoscale objects like carbon nanotubes (CNTs) and dendrimers is of fundamental interest because of their potential application in CNT separation, gene therapy and antisense therapy. Combining nucleic acids with CNTs and dendrimers also opens the door towards controllable self-assembly to generate various supra-molecular and nano-structures with desired morphologies. The interaction between these nanoscale objects also serve as a model system for studying DNA compaction, which is a fundamental process in chromatin organization. By using fully atomistic simulations, here we report various aspects of the interactions and binding modes of DNA and small interfering RNA (siRNA) with CNTs, graphene and dendrimers. Our results give a microscopic picture and mechanism of the adsorption of single-and double-strand DNA (ssDNA and dsDNA) on CNT and graphene. The nucleic acid-CNT interaction is dominated by the dispersive van der Waals (vdW) interaction. In contrast, the complexation of DNA (both ssDNA and dsDNA) and siRNA with various generations of poly-amido-amine (PAMAM) dendrimers is governed by electrostatic interactions. Our results reveal that both the DNA and siRNA form stable complex with the PAMAM dendrimer at a physiological pH when the dendrimer is positively charged due to the protonation of the primary amines. The size and binding energy of the complex increase with increase in dendrimer generation. We also give a summary of the current status in these fields and discuss future prospects.[Nandy B, Santosh M and Maiti PK 2012 Interaction of nucleic acids with carbon nanotubes and dendrimers.

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Section: Effect Of Ethanol On A-to B-dna Transitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interaction of nucleic acids with carbon nanotubes and dendrimers

2012

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“…Recently, photoluminescence (PL) of single-walled carbon nanotubes (SWNTs) has been intensively investigated for the optical characterization of SWNTs [1][2][3][4][5][6][7][8]. By plotting PL emission intensities as a function of emission and excitation photon energy, Bachilo et al [2] obtained a two-dimensional map of relative emission intensities.…”

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confidence: 99%

Identification of an excitonic phonon sideband by photoluminescence spectroscopy of single-walled carbon-13 nanotubes

2006

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We have studied photoluminescence (PL) and resonant Raman scatterings of single-walled carbon nanotubes (SWNTs) consisting of carbon-13 (SW 13 CNTs) synthesized from a small amount of isotopically modified ethanol. There was almost no change in the Raman spectra shape for SW 13 CNTs except for a downshift of the Raman shift frequency by the square-root of the mass ratio 12/13. By comparing photoluminescence excitation (PLE) spectra of SW 13 CNTs and normal SWNTs, the excitonic phonon sideband due to strong exciton-phonon interaction was clearly identified with the expected isotope shift.

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“…The BWF peak in bundles has been reported to increase as a result of tube-tube interactions that are thought to produce a plasmon band that increases the plasmon-phonon coupling [28]. For example, when bundles are reduced in size [28], or the nanotubes within a bundle are isolated by oxidation [29] or wrapped with DNA molecules [26,27], the BWF peak decreases. The BWF peak increases again when the oxide or DNA molecules are removed.…”

Section: Discussionmentioning

confidence: 99%

“…The 1517 cm − 1 curve can be attributed to a G −S peak from the small diameter E22 S semiconducting nanotubes of E2g symmetry overlapped with a G −M peak from mid diameter nanotubes with E11 M transitions and A1g symmetry. The 1542 cm − 1 curve can be attributed to the G −M peak from upper mid diameter metallic nanotubes with E11 M transitions and A1g symmetry in which inter-tube electron-phonon coupling does not appear to occur [26,27]. The 1572 cm − 1 curve can be attributed to the G −S peak of the large diameter semiconducting nanotubes with E33 S transitions and E1g symmetry, and the 1585 cm −1 curve can be attributed to the G + peak for both metallic and semiconducting nanotubes.…”

Section: Hipco Swcntsmentioning

confidence: 99%

Low-energy electron irradiation of preheated and gas-exposed single-wall carbon nanotubes

Ecton

Beatty

Verbeck

et al. 2016

Applied Surface Science

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Ecton, Philip A. Low-Energy Electron Irradiation of Preheated and Gas-Exposed Single-Wall Carbon Nanotubes. Doctor of Philosophy (Physics), December 2016, 110 pp., 53 figures, 40 numbered references, bibliography.We investigate the conditions under which electron irradiation of single-walled carbon nanotube (SWCNT) bundles with 2 keV electrons produces an increase in the Raman D peak.We find that an increase in the D peak does not occur when SWCNTs are preheated in situ at 600 C for 1 h in ultrahigh vacuum (UHV) before irradiation is performed. Exposing SWCNTs to air or other gases after preheating in UHV and before irradiation results in an increase in the D peak. Small diameter SWCNTs that are not preheated or preheated and exposed to air show a significant increase in the D and G bands after irradiation. X-ray photoelectron spectroscopy shows no chemical shifts in the C1s peak of SWCNTs that have been irradiated versus SWCNTs that have not been irradiated, suggesting that the increase in the D peak is not due to chemisorption of adsorbates on the nanotubes.

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Optical characterization of DNA-wrapped carbon nanotube hybrids

Cited by 126 publications

References 12 publications

Interaction of nucleic acids with carbon nanotubes and dendrimers

Interaction of nucleic acids with carbon nanotubes and dendrimers

Identification of an excitonic phonon sideband by photoluminescence spectroscopy of single-walled carbon-13 nanotubes

Low-energy electron irradiation of preheated and gas-exposed single-wall carbon nanotubes

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