Energy Transfer from an Individual Quantum Dot to a Carbon Nanotube

Shafran, Eyal; Mangum, Benjamin D.; Gerton, Jordan M.

doi:10.1021/nl102045g

Cited by 65 publications

(79 citation statements)

References 36 publications

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“…They concluded that their experimental findings can be explained due to the energy transfer between the QD and the graphene sheet. Similar energy transfer between a QD and carbon nanotube has also been found experimentally by Shafran et al 34 When a QD is in contact with biomolecules, molecular beacons, DNA, or aptamers, its dielectric constant can be modified. Therefore, we have investigated the role of the dielectric constant of the QD on the energy transfer to graphene.…”

Section: Resultssupporting

confidence: 77%

“…21,22,[26][27][28][29] Recently, experimental research on graphene has been extended to the fabrication and study of QD-graphene nanostructures. [30][31][32][33][34] For example, a CdS QD-graphene hybrid system has been synthesized by Cao et al, 30 in which a picosecond ultrafast electron transfer process from the excited QD to the graphene matrix was observed using time-resolved fluorescence spectroscopy. Chen et al 31 have fabricated CdSe/ZnS QDs in contact with single-and few-layer graphene sheets.…”

Section: Introductionmentioning

confidence: 99%

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Dipole-dipole interaction between a quantum dot and a graphene nanodisk

et al. 2012

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We study theoretically the dipole-dipole interaction and energy transfer in a hybrid system consisting of a quantum dot and graphene nanodisk embedded in a nonlinear photonic crystal. In our model, a probe laser field is applied to measure the energy transfer between the quantum dot and graphene nanodisk, while a control field manipulates the energy transfer process. These fields create excitons in the quantum dot and surface plasmon polaritons in the graphene nanodisk which interact via the dipole-dipole interaction. Here, the nonlinear photonic crystal acts as a tunable photonic reservoir for the quantum dot, and is used to control the energy transfer. We have found that the spectrum of power absorption in the quantum dot has two peaks due to the creation of two dressed excitons in the presence of the dipole-dipole interaction. The energy transfer rate spectrum of the graphene nanodisk also has two peaks due to the absorption of these two dressed excitons. Additionally, energy transfer between the quantum dot and the graphene nanodisk can be switched on and off by applying a pump laser to the photonic crystal or by adjusting the strength of the dipole-dipole interaction. We show that the intensity and frequencies of the peaks in the energy transfer rate spectra can be modified by changing the number of graphene monolayers in the nanodisk or the separation between the quantum dot and graphene. Our results agree with existing experiments on a qualitative basis. The principle of our system can be employed to fabricate nanobiosensors, optical nanoswitches, and energy transfer devices.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Dipole-dipole interaction between a quantum dot and a graphene nanodisk

et al. 2012

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“…Coupling from a bound NP (acting as donor) to the SWNT (as acceptor) could be due to the dipole-dipole coupling of Förster resonance energy transfer (FRET) and/or charge transfer, including exciton transfer, or transfer of electrons and/or holes [28][29][30][31] . When this coupling is comparable or fast compared to NP relaxation, radiative, and intra-nanoparticle nonradiative decay, weaker overall NP PL emission is expected and the PL spectrum is expected to be blue shifted relative to that from unbound NPs; this represents a "snapshot" of PL at the early stages of emission from unbound NPs, or "hot luminescence.…”

Section: Discussionmentioning

confidence: 99%

“…The much larger shifts seen here may be due to more rapid coupling. A recent study of coupling from a single CdSe NP to the end of a single SWNT suggested coupling by FRET (with a 1/r 6 dependence for that geometry) and no charge transfer (implied by the lack of change in PL blinking when the NP and SWNT are brought in contact, as is expected for CdSe/ZnS NPs) 31 .…”

Section: Relation To Previous Workmentioning

confidence: 91%

Anomalous photoluminescence Stokes shift in CdSe nanoparticle and carbon nanotube hybrids

Akey

Zhu

et al. 2012

Phys. Rev. B

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A very large decrease in the Stokes shift in CdSe nanoparticle photoluminescence is seen from hybrid materials in which the nanoparticles are attached to single-walled carbon nanotubes after pyridine treatment relative to unbound nanoparticles capped by pyridine. This is observed particularly for very small nanoparticles, for hybrids composed of core-only and core-shell nanoparticles, and for hybrids made with bundles of mixtures of semiconducting and metallic nanotubes or with semiconducting nanotubes only, and is likely due to fast Förster resonance energy transfer (FRET) from the nanoparticles to the nanotubes. A simple model demonstrates the plausibility of the hot luminescence explanation of this decreased Stokes shift.2

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“…In this scenario, each sequential transduction process must be more rapid than the internal relaxation time, or the energy will be dissipated as radiation or heat. Recently, we demonstrated that when a carbon nanotube (CNT) is brought into close proximity with a fluorophore, the fluorophore's emission is nearly completely quenched [1,2]. This indicates that the fluorophore's internal energy is transduced into electronic modes within the CNT.…”

mentioning

confidence: 99%

Carbon Nanotubes as Optoelectronic Energy Transducers

2011

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The transduction of energy from one type to another is frequently a limiting factor in the efficiency of optoelectronic devices. Such transduction processes are often necessary for energy to propagate across the interface between materials. As an example, next generation solar cells may require several energy transduction steps: conversion of electromagnetic radiation to internal energy of one component, to internal energy of another component, and finally to electric power. In this scenario, each sequential transduction process must be more rapid than the internal relaxation time, or the energy will be dissipated as radiation or heat. Recently, we demonstrated that when a carbon nanotube (CNT) is brought into close proximity with a fluorophore, the fluorophore's emission is nearly completely quenched [1,2]. This indicates that the fluorophore's internal energy is transduced into electronic modes within the CNT. Nanotubes are particularly intriguing candidates for studying nanoscale energy transduction because on the one hand, they can support ballistic charge transport, and on the other, the detailed electronic properties vary from tube to tube according to its chirality. Furthermore, they have been synthesized as dense vertically-aligned networks, facilitating their incorporation into complex optoelectronic materials, and finally they have been used as nanoscale components in molecular electronics.Carbon nanotubes (CNTs) have been proposed as a charge-transport element in next-generation optoelectronic devices and materials, including photovoltaics [3]. Indeed, nano-composite materials with a strong light absorption component (i.e., fluorophores) coupled to a CNT component have been synthesized via several different methods. The interfacial area between donor and acceptor in a nanocomposite material is extremely large, so nanoscale energy transfer is very important, but difficult to measure in a controlled and precise manner. We used individual CNTs attached to atomic force microscope (AFM) tips to probe isolated quantum dots (QDs) while measuring the fluorescence signal. Figure 1(a) shows an example of a fluorescence approach curve; the far-fieldnormalized fluorescence signal, S(z), is plotted as a function of the vertical separation, z, between the CNT terminus and QD surface; also shown is an x-z tomographical section [4] of a QD. The strong reduction in fluorescence was observed consistently in more than 100 measurements on >50 QDs using 6 different CNTs [1]. All data agree to high precision with energy transfer via a Förster dipoledipole coupling between a photoexcited exciton in the QD and a resonantly-excited exciton in the CNT. However, this agreement is only achieved if the standard Förster model is modified to account for the possibility of creating an exciton above the CNT terminus. This model predicts a strong correlation between the Förster radius and the average position at which the exciton is created within the CNT, in agreement with measurements. The model predicts the peak energy transfer eff...

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Energy Transfer from an Individual Quantum Dot to a Carbon Nanotube

Cited by 65 publications

References 36 publications

Dipole-dipole interaction between a quantum dot and a graphene nanodisk

Dipole-dipole interaction between a quantum dot and a graphene nanodisk

Anomalous photoluminescence Stokes shift in CdSe nanoparticle and carbon nanotube hybrids

Carbon Nanotubes as Optoelectronic Energy Transducers

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