Mechanism of Electrolyte-Induced Brightening in Single-Wall Carbon Nanotubes

Duque, Juan G.; Oudjedi, Laura; Crochet, Jared; Tretiak, Sergei; Lounis, Brahim; Doorn, Stephen K.; Cognet, Laurent

doi:10.1021/ja4001757

Cited by 34 publications

(37 citation statements)

References 32 publications

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“…The DFT results thus suggest that the dopant acts as an antenna to the environment that attracts external charges. Such charging can significantly enhance non-radiative decay channels, 46,47 thus providing a mechanism for the blinking behavior.…”

Section: E 11 * Blinking Dynamicsmentioning

confidence: 99%

Photoluminescence imaging of solitary dopant sites in covalently doped single-wall carbon nanotubes

et al. 2015

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Covalent dopants in semiconducting single wall carbon nanotubes (SWCNTs) are becoming important as routes for introducing new photoluminescent emitting states with potential for enhanced quantum yields, new functionality, and as species capable of near-IR room-temperature single photon emission. The origin and behavior of the dopant-induced emission is thus important to understand as a key requirement for successful room-T photonics and optoelectronics applications. Here, we use direct correlated two-color photoluminescence imaging to probe how the interplay between the SWCNT bright E(11) exciton and solitary dopant sites yields the dopant-induced emission for three different dopant species: oxygen, 4-methoxybenzene, and 4-bromobenzene. We introduce a route to control dopant functionalization to a low level as a means for introducing spatially well-separated solitary dopant sites. Resolution of emission from solitary dopant sites and correlation to their impact on E(11) emission allows confirmation of dopants as trapping sites for localization of E(11) excitons following their diffusive transport to the dopant site. Imaging of the dopant emission also reveals photoluminescence intermittency (blinking), with blinking dynamics being dependent on the specific dopant. Density functional theory calculations were performed to evaluate the stability of dopants and delineate the possible mechanisms of blinking. Theoretical modeling suggests that the trapping of free charges in the potential well created by permanent dipoles introduced by dopant atoms/groups is likely responsible for the blinking, with the strongest effects being predicted and observed for oxygen-doped SWCNTs.

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Section: E 11 * Blinking Dynamicsmentioning

confidence: 99%

Photoluminescence imaging of solitary dopant sites in covalently doped single-wall carbon nanotubes

et al. 2015

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“…8,22 For the above reasons, much experimental and theoretical work has been done to understand noncovalent interactions that lead to well-dispersed aqueous SWCNT suspensions and their fluorescence. 23–26 In each of the above examples, most of which employ DNA or RNA polymers to form coronae, the structure of the polymer conjugated to the SWCNT is a crucial factor for the proper execution of the technology. Fundamental nucleotide-SWCNT interactions have enabled SWCNT length and chirality sorting, 18,27–29 SWCNT patterning and self- assembly, 30,31 and molecular detection.…”

Section: Introductionmentioning

confidence: 99%

Comparative Dynamics and Sequence Dependence of DNA and RNA Binding to Single Walled Carbon Nanotubes

Landry

Vuković²,

Kruss

et al. 2015

J. Phys. Chem. C

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Noncovalent polymer-single walled carbon nanotube (SWCNT) conjugates have gained recent interest due to their prevalent use as electrochemical and optical sensors, SWCNT-based therapeutics, and for SWCNT separation. However, little is known about the effects of polymer-SWCNT molecular interactions on functional properties of these conjugates. In this work, we show that SWCNT complexed with related polynucleotide polymers (DNA, RNA) have dramatically different fluorescence stability. Surprisingly, we find a difference of nearly 2500-fold in fluorescence emission between the most fluorescently stable DNA-SWCNT complex, C30 DNA-SWCNT, compared to the least fluorescently stable complex, (AT)7A-(GU)7G DNA-RNA hybrid-SWCNT. We further reveal the existence of three regimes in which SWCNT fluorescence varies nonmonotonically with SWCNT concentration. We utilize molecular dynamics simulations to elucidate the conformation and atomic details of SWCNT-corona phase interactions. Our results show that variations in polynucleotide sequence or sugar backbone can lead to large changes in the conformational stability of the polymer SWCNT corona and the SWCNT optical response. Finally, we demonstrate the effect of the coronae on the response of a recently developed dopamine nanosensor, based on (GT)15 DNA- and (GU)15 RNA-SWCNT complexes. Our results clarify several features of the sequence dependence of corona phases produced by polynucleotides adsorbed to single walled carbon nanotubes, and the implications for molecular recognition in such phases.

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“…The QY of SWNTs in solutions is lower than suspended SWNTs due to additional nonradiative decay channel such as metallic SWNTs in bundles and defects in SWNT sidewalls . Although these problems can be partially solved by resonance energy transfer from dye molecules, addition of electrolyte to reduce the nonradiative rates on the quenching sites, addition of reducing agents to passivate the defect sites, etc., the QY of SWNTs is still low intrinsically. This can be understood by the existence of the nonradiative, or “dark” excitonic states, which are lower in energy than the optically allowed radiative, or “bright” excitonic states …”

Section: Introductionmentioning

confidence: 99%

Chirality‐Selective Photoluminescence Enhancement of ssDNA‐Wrapped Single‐Walled Carbon Nanotubes Modified with Gold Nanoparticles

Yang

Zhao

Lyu

et al. 2016

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In this work, a convenient method to enhance the photoluminescence (PL) of single-walled carbon nanotubes (SWNTs) in aqueous solutions is provided. Dispersing by single-stranded DNA (ssDNA) and modifying with gold nanoparticles (AuNPs), about tenfold PL enhancement of the SWNTs is observed. More importantly, the selective PL enhancement is achieved for some particular chiralities of interest over all other chiralities, by using certain specific ssDNA sequences that are reported to recognize these particular chiralities. By forming AuNP-DNA-SWNT nanohybrids, ssDNA serves as superior molecular spacers that on one hand protect SWNT from direct contacting with AuNP and causing PL quench, and on the other hand attract the AuNP in close proximity to the SWNT to enhance its PL. This PL enhancement method can be utilized for the PL analysis of SWNTs in aqueous solutions, for biomedical imaging, and may serve as a prescreening method for the recognition and separation of single chirality SWNTs by ssDNA.

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Mechanism of Electrolyte-Induced Brightening in Single-Wall Carbon Nanotubes

Cited by 34 publications

References 32 publications

Photoluminescence imaging of solitary dopant sites in covalently doped single-wall carbon nanotubes

Photoluminescence imaging of solitary dopant sites in covalently doped single-wall carbon nanotubes

Comparative Dynamics and Sequence Dependence of DNA and RNA Binding to Single Walled Carbon Nanotubes

Chirality‐Selective Photoluminescence Enhancement of ssDNA‐Wrapped Single‐Walled Carbon Nanotubes Modified with Gold Nanoparticles

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