Influence of cysteine doping on photoluminescence intensity from semiconducting single-walled carbon nanotubes

Kurnosov, N. V.; Leontiev, V. S.; Linnik, A. S.; Karachevtsev, V. A.

doi:10.1016/j.cplett.2015.01.046

Cited by 11 publications

(9 citation statements)

References 23 publications

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“…3). We have assumed earlier that such enhancement can be related to the ability of cysteine to reduce p-defects due to the presence of a thiol group in the structure of this amino acid [12]. These defects can be formed when oxygen binds covalently to carbon atoms in nanotubes [9].…”

Section: Resultsmentioning

confidence: 99%

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Enhancement of Luminescence from a Carbon Nanotube Aqueous Suspension at the Cysteine Doping: Influence of the Adsorbed Polymer

Kurnosov¹,

Leontiev²,

Karachevtsev³

2016

Ukr. J. Phys.

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We have studied the enhancement of the luminescence intensity from semiconducting carbon nanotubes with the adsorbed polymer (DNA) in an aqueous suspension due to the doping with amino acid cysteine. The intensity increase is caused by the presence of a thiol group in the cysteine structure, which allows a reduction of defects on the nanotube surface that quench the emission. It is observed that the initial nanotube/polymer weight ratio affects the dependence of the luminescence intensity on the cysteine concentration so that it is shifted toward greater concentrations in case of the 1 : 1 ratio comparing to the dependence obtained for a suspension with the 1 : 0.5 ratio. Such shift can be explained by a greater surface coverage with the polymer that restricts the access of cysteine molecules to nanotube defects. We have also noted that the obtained dependences vary for nanotubes with different chiralities, which can be attributed to different densities of a polymer coverage on their surfaces. K e y w o r d s: luminescence, exciton, cysteine, DNA, carbon nanotube, structure defect.

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Section: Resultsmentioning

confidence: 99%

“…We have shown [12] that the addition of cysteine to nanotubes also leads to an enhancement of the nanotube luminescence. This increase of the emission was explained by a reduction of defects, because this amino acid also contains the thiol group.…”

Section: Introductionmentioning

confidence: 89%

Enhancement of Luminescence from a Carbon Nanotube Aqueous Suspension at the Cysteine Doping: Influence of the Adsorbed Polymer

Kurnosov¹,

Leontiev²,

Karachevtsev³

2016

Ukr. J. Phys.

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“…More importantly, no measurable reaction was detected when colloids were protected from ambient light with tin foil (Figure S8). We next investigated the change in solution pH after the addition of cysteine, a reductant, 63 or hydrogen peroxide, an oxidant (Figure 5b). Alkalization was observed upon addition of cysteine for lower illumination fluence (pH ∼ 9−10) and a shift of the acidic maximum occured from pH ∼ 3 (without cysteine) to pH ∼ 2 (with cysteine).…”

Section: ■ Resultsmentioning

confidence: 99%

Optical Voltammetry of Polymer-Encapsulated Single-Walled Carbon Nanotubes

et al. 2019

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The semiconducting single-walled carbon nanotube (SWCNT), noncovalently wrapped by a polymeric monolayer, is a nanoscale semiconductor-electrolyte interface under investigation for sensing, photonics, and photovoltaic applications. SWCNT complexes are routinely observed to sensitize various electrochemical/redox phenomena, even in the absence of an external field. While the photoluminescence response to gate voltage depends on the redox potential of the nanotube, analogous optical voltammetry of functionalized carbon nanotubes could be conducted in suspension without applying voltage but by varying the solution conditions as well as the chemistry of the encapsulating polymer. Steady-state photoluminescence, absorbance, and in situ measurements of O 2 /H 2 O reactivity show correlation with the pH/pK a -dependent reactivity of πrich coatings. The nanotube emission responses suggest that the presence of photogenerated potential may explain the observed coating electrochemical reactivity. This work finds that electronic and chemical interactions of the nanotube with the encapsulating polymer may play a critical role in applications that depend on radiative recombination, such as optical sensing.

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“…Optical techniques, such as near-infrared fluorescence and photoluminescence excitation, albeit very powerful, are exclusively limited to individual SWCNTs, which is often unviable in many samples and procedures. 23,24 Raman spectroscopy is much more accessible and powerful as it is a non-destructive, contactless and quick technique that requires relatively simple or no preparation, and is greatly sensitive to changes in the physical and chemical properties of SWCNTs. 25 To characterize doping, Raman spectroscopy primarily relies on G-band shifts.…”

Section: Introductionmentioning

confidence: 99%

A tool box to ascertain the nature of doping and photoresponse in single-walled carbon nanotubes

Santidrián

González‐Domínguez

Diez‐Cabanes

et al. 2019

Phys. Chem. Chem. Phys.

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Influence of cysteine doping on photoluminescence intensity from semiconducting single-walled carbon nanotubes

Cited by 11 publications

References 23 publications

Enhancement of Luminescence from a Carbon Nanotube Aqueous Suspension at the Cysteine Doping: Influence of the Adsorbed Polymer

Enhancement of Luminescence from a Carbon Nanotube Aqueous Suspension at the Cysteine Doping: Influence of the Adsorbed Polymer

Optical Voltammetry of Polymer-Encapsulated Single-Walled Carbon Nanotubes

A tool box to ascertain the nature of doping and photoresponse in single-walled carbon nanotubes

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