Self-Assembling Peptide Coatings Designed for Highly Luminescent Suspension of Single-Walled Carbon Nanotubes

Tsyboulski, Dmitri A.; Bakota, Erica L.; Witus, Leah S.; Rocha, John-David R.; Hartgerink, Jeffrey D.; Weisman, R. Bruce

doi:10.1021/ja807224x

Cited by 68 publications

(104 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The experimental observation can be explained within our threelevel model by a reduced γ V between the two states in the case of (6,4) nanotubes. This would be expected due to a larger bright-dark splitting energy ∆E that was found to scale inversely with the diameter squared.…”

mentioning

confidence: 59%

“…The decays were obtained in 10 min integration time with low excitation intensities e10 12 photons/(pulse · cm 2 ) to ensure that less than one photon is absorbed per pulse knowing the resonant absorption cross-section of the SWNTs (∼10 -17 cm 2 per carbon atom). 10,13 For data fitting we record the instrumental response function (IRF) of the TCSPC setup at a wavelength close to the peak emission line (∼980 nm for (6,5) and ∼880 nm for (6,4)) of the nanotubes (see Supporting Information). This is an important point since the penetration depth of light into the photoactive Si layer of avalanche photodiodes is wavelength dependent and measuring the IRF at the excitation wavelength (close to E 22 ) would lead to an erroneous additional decay component as reported 14 for CoMoCat tubes.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Mono- and Biexponential Luminescence Decays of Individual Single-Walled Carbon Nanotubes

et al. 2010

View full text Add to dashboard Cite

We have studied the exciton recombination dynamics of individual (6,4) and (6,5) single-walled carbon nanotubes embedded in aqueous gels or deposited on glass surfaces. CoMoCat nanotubes systematically display short monoexponential photoluminescence (PL) decays presumably due to defects introduced during their synthesis. In contrast HiPco nanotubes can either display mono-or biexponential PL decays depending on the environmental conditions. Transition from bi-to monoexponential decays can be reproduced by a simple three level model taking into account defect-dependent nonradiative decay mechanisms.The photoluminescence (PL) properties of semiconducting single walled carbon nanotubes (SWNTs) have attracted much attention over the last years.1 These properties strongly depend on the structure of each nanotube 2 but also on extrinsic factors resulting for instance from synthesis or environmental factors. 3-7As a result, PL studies performed on ensemble of SWNTs are affected by inhomogeneities that hinder the development of a detailed understanding of the underlying mechanisms. Experiments on individual SWNTs remove part of this heterogeneity by allowing description of the characteristics of each SWNT in its particular environment. 8 Comparisons between values of a physical parameter extracted from different experimental reports are however difficult because, generally, the studied samples differ by synthesis methods or preparation procedures. For example PL decays performed on individual (6,4) and (6,5) nanotubes by different groups have resulted in distinct behaviors, ranging from very short monoexponential decays to longer biexponential ones. 5,7,[9][10][11] This paper aims at understanding this large disparity in PL decay behaviors. We experimentally confirm that PL decays of (6,5) and (6,4) nanotubes can exhibit either mono-or biexponential behaviors and show that these depend on synthesis methods and nanotube environment. These observations are explained by a previous simple three-level model 10 taking now into account the defect-dependent dominant nonradiative decay mechanisms proposed by Pereibenos et al. 12The SWNTs used in this study were either synthesized using HiPco or CoMoCat methods. The nanotubes were dispersed in aqueous suspensions of the anionic surfactants sodium deoxycholate (DOC). For observations, single-molecule wide-field and confocal PL microscopes were used to image SWNTs excited with a continuous wave laser. The SWNTs were immobilized in aqueous agarose gels (5 wt %) or spin-coated on surfaces. SWNTs concentration was kept well below 1 µm -3 such that bright individual nanotubes could be optically resolved. The PL of these bright tubes was sent to a spectrometer for further spectral identifications of individual (6,4) or (6,5) nanotubes. Typically, isolated SWNTs feature narrow PL lines from their bright excitonic state E 11 , with full width at half-maximum (fwhm) in the range of ∼17-22 nm. Following identification of these bright individual nanotubes, the excitation modality was switche...

show abstract

mentioning

confidence: 59%

mentioning

confidence: 99%

Mono- and Biexponential Luminescence Decays of Individual Single-Walled Carbon Nanotubes

et al. 2010

View full text Add to dashboard Cite

show abstract

“…[18][19][20][21][22] Thus, an increase in the uniformity of the surfactant coverage leads to significantly increased quantum yields. [23][24] Additionally, adsorption of the electron-poor perylene unit leads to p-type doping of the nanotubes, [17] which results in nanotube fluorescence bleaching by electron transfer from the nanotube to the perylene unit. This phenomenon has been well documented by OConnell et al for the case of the addition of an organic acceptor molecule to a dispersion of SWCNTs in SDS.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Adsorption Affinity of Anionic Perylene‐Based Surfactants towards Smaller‐Diameter SWCNTs

Backes

Mundloch

Schmidt

et al. 2010

Chemistry A European J

View full text Add to dashboard Cite

We present evidence from multiple characterization methods, such as emission spectroscopy, zeta potential, and analytical ultracentrifugation, to shed light on the adsorption behavior of synthesized perylene surfactants on single-walled carbon nanotubes (SWCNTs). On comparing dispersions of smaller-diameter SWCNTs prepared by using cobalt-molybdenum catalysis (CoMoCAT) with the larger-diameter SWCNTs prepared by high-pressure carbon monoxide decomposition (HiPco), we find that the CoMoCAT-perylene surfactant dispersions are characterized by more negative zeta potentials, and higher anhydrous specific volumes (the latter determined from the sedimentation coefficients by analytical ultracentrifugation), which indicates an increased packing density of the perylene surfactants on nanotubes of smaller diameter. This conclusion is further supported by the subsequent replacement of the perylene derivatives from the nanotube sidewall by sodium dodecyl benzene sulfonate (SDBS), which first occurs on the larger-diameter nanotubes. The enhanced adsorption affinity of the perylene surfactants towards smaller-diameter SWCNTs can be understood in terms of a change in the supramolecular arrangement of the perylene derivatives on the scaffold of the SWCNTs. These findings represent a significant step forward in understanding the noncovalent interaction of π-surfactants with carbon nanotubes, which will enable the design of novel surfactants with enhanced selectivity for certain nanotube species.

show abstract

“…[ 97 ] As imaged by atomic force microscopy in phase imaging the nanotubes are accordingly more homogenously covered by PBI 3 compared to the bolaamphiphiles (Figure 4 b). [ 89 ] As also demonstrated by other groups [ 106,107 ] the homogeneity of the SWCNT coverage directly impacts the fl uorescence quantum yields of the carbon allotrope, presumably due to the reduced contact with water and oxygen. In perfect agreement, the nanotube fl uorescence intensity is higher in the case of the SWCNT-3 dispersion in comparison to the other designed perylene π -surfactants (Figure 4b), albeit being lower than the SDBS reference due to the charge transfer and π -π -stacking interaction contribution.…”

Section: Progress Reportmentioning

confidence: 72%

The Potential of Perylene Bisimide Derivatives for the Solubilization of Carbon Nanotubes and Graphene

2011

View full text Add to dashboard Cite

Carbon nanotubes and graphene are outstanding materials of the 21st century with a broad spectrum of applications. However, major challenges are faced such as the intrinsically low solubility of both sp2 carbon allotropes. To overcome this hurdle the potential of noncovalent functionalization is summarized with a special focus on the establishment of the perylene bisimide unit as aromatic anchor to the graphitic surface. Rational surfactant design is unmasked as the key to solubilization of the carbon allotropes, while at the same time tailoring their surface properties, or even electronic properties in a fully reversible fashion.

show abstract

Self-Assembling Peptide Coatings Designed for Highly Luminescent Suspension of Single-Walled Carbon Nanotubes

Cited by 68 publications

References 41 publications

Mono- and Biexponential Luminescence Decays of Individual Single-Walled Carbon Nanotubes

Mono- and Biexponential Luminescence Decays of Individual Single-Walled Carbon Nanotubes

Enhanced Adsorption Affinity of Anionic Perylene‐Based Surfactants towards Smaller‐Diameter SWCNTs

The Potential of Perylene Bisimide Derivatives for the Solubilization of Carbon Nanotubes and Graphene

Contact Info

Product

Resources

About