G band Raman features of DNA-wrapped single-wall carbon nanotubes in aqueous solution and air

Kawamoto, H.; Uchida, Takashi; Kojima, K.; Tachibana, Masaru

doi:10.1016/j.cplett.2006.10.019

Cited by 27 publications

(29 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From Figure 2(d) we also notice that the G + peak of hybrid nanotubes has upshifted by ~ 10 cm -1 as a result of wrapping. This feature is consistent with previous literature and is associated with charge transfer from nanotubes to DNA molecule [27,30] , which further confirms tight physical …”

Section: Device Synthesissupporting

confidence: 80%

See 1 more Smart Citation

Spin Filtering through Single‐Wall Carbon Nanotubes Functionalized with Single‐Stranded DNA

Alam

Pramanik

2015

Adv Funct Materials

View full text Add to dashboard Cite

Abstract.High spin polarization materials or spin filters are key components in spintronics, a niche subfield of electronics where carrier spins play a functional role. Carrier transmission through these materials is "spin selective" i.e. these materials are able to discriminate between "up" and "down" spins. Common spin filters include transition metal ferromagnets and their alloys, with typical spin selectivity (or, polarization) ~ 50% or less. Here we consider carrier transport in an archetypical one-dimensional molecular hybrid in which a single wall carbon nanotube (SWCNT) is wrapped around by single stranded deoxyribonucleic acid (ssDNA). By magnetoresistance measurements we show that this system can act as a spin filter with maximum spin polarization approaching ~ 74% at low temperatures, significantly larger than transition metals under comparable conditions. Inversion asymmetric helicoidal potential of the charged ssDNA backbone induces a Rashba spin-orbit interaction in the SWCNT channel and polarizes carrier spins. Our results are consistent with recent theoretical work that predicted spin dependent conductance in ssDNA-SWCNT hybrid. Ability to generate highly spin polarized carriers using molecular functionalization can lead to magnet-less and contactless spintronic devices in the future. This can eliminate the conductivity mismatch problem and open new directions for research in organic spintronics. 2 1. Introduction.

show abstract

Section: Device Synthesissupporting

confidence: 80%

“…This intensity reduction is a common feature of the ssDNA-SWCNT hybrid and implies suppression of vibrations of carbon atoms along the circumferential direction as a result of wrapping [27] . From Figure 2(d) we also notice that the G + peak of hybrid nanotubes has upshifted by ~ 10 cm -1 as a result of wrapping.…”

Section: Device Synthesismentioning

confidence: 99%

Spin Filtering through Single‐Wall Carbon Nanotubes Functionalized with Single‐Stranded DNA

Alam

Pramanik

2015

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…The G band of the pristine SWNTs was slightly downshifted from 1592 to 1586 cm −1 after peptide wrapping. The band shifts observed here suggest that charge transfer between the SWNTs and the programmed peptide may occur through molecular-level interaction [27]. A small upshift (by 5 cm ) of the Raman G-band in the nanohybrids compared to the p-SWNTs was observed; this is attributed to the phonon stiffening effect via p-type doping [28].…”

Section: Synthesis Aunp/p-swnt Nanohybrid Filmsmentioning

confidence: 60%

Preparation of gold nanoparticle/single-walled carbon nanotube nanohybrids using biologically programmed peptide for application of flexible transparent conducting films

Yang¹,

Choi²

2016

Carbon letters

View full text Add to dashboard Cite

In this study, we report a general method for preparation of a one-dimensional (1D) arrangement of Au nanoparticles on single-walled carbon nanotubes (SWNTs) using biologically programmed peptides as structure-guiding 1D templates. The peptides were designed by the combination of glutamic acid (E), glycine (G), and phenylalanine (F) amino acids; peptides efficiently debundled and exfoliated the SWNTs for stability of the dispersion and guided the growth of the array of Au nanoparticles in a controllable manner. Moreover, we demonstrated the superior ability of 1D nanohybrids as flexible, transparent, and conducting materials. The highly stable dispersion of 1D nanohybrids in aqueous solution enabled the fabrication of flexible, transparent, and conductive nanohybrid films using vacuum filtration, resulting in good optical and electrical properties.

show abstract

“…o e l u c i d a t e t h e a c t u a l re l a t i v e amounts of internalized SWNTs in the presence and absence of FBS, Raman spectroscopy was employed to obtain quantitative information about internalized SWNTs by measuring the G band intensities at 1590 cm 1 [21]. As shown in Fig.…”

Section: Nano Researchmentioning

confidence: 99%

“…Since SWNTs display a strong characteristic resonance Raman band at around 1590 cm 1 (G band) [21], the amounts of free SWNTs in solution and SWNTs internalized in cells were directly determined by measuring G band intensities. Pre-incubated HeLa cells on a cover slip were treated with Cy3DNA-SWNTs (ca.…”

Section: Raman Measurements Of Cy3dna-swnts In Cellsmentioning

confidence: 99%

Effect of nucleases on the cellular internalization of fluorescent labeled DNA-functionalized single-walled carbon nanotubes

et al. 2008

View full text Add to dashboard Cite

Nuclease effects on the cell internalization of single-walled carbon nanotubes (SWNTs) functionalized with fluorescent-labeled DNA in serum containing cell growth media were examined. When Cy3-labeled DNAfunctionalized SWNT conjugates (Cy3DNA-SWNTs) were incubated with HeLa cells in a fatal bovine serum (FBS) medium, a high fl uorescence intensity was obtained from the cells, indicative for the high level inclusion of Cy3DNA-SWNTs. However, the fluorescence intensity was remarkably reduced if Cy3DNA-SWNTs were incubated with cells in the FBS-free medium. Further systematic control experiments revealed that Cy3 dye molecules were released from Cy3DNA-SWNT conjugates by nuclease, and the free Cy3 dyes penetrate into HeLa cell with high efficiency. Although the actual amounts of SWNTs internalized in the cells were almost identical for both cells incubated in the FBS-present and FBS-absent media according to the Raman measurements, one should be cautious to determine the degree of SWNT internalization based on the fl uorescence intensities especially when the coloring dye molecules were linked to oligonucleotides in nuclease containing media.

show abstract

G band Raman features of DNA-wrapped single-wall carbon nanotubes in aqueous solution and air

Cited by 27 publications

References 22 publications

Spin Filtering through Single‐Wall Carbon Nanotubes Functionalized with Single‐Stranded DNA

Spin Filtering through Single‐Wall Carbon Nanotubes Functionalized with Single‐Stranded DNA

Preparation of gold nanoparticle/single-walled carbon nanotube nanohybrids using biologically programmed peptide for application of flexible transparent conducting films

Effect of nucleases on the cellular internalization of fluorescent labeled DNA-functionalized single-walled carbon nanotubes

Contact Info

Product

Resources

About