The local field dependent effect of the critical distance of energy transfer between nanoparticles

Ha, Chu Viet; Nga, Do T.; Việt, Nguyễn Ái; Nhung, Tran Hong

doi:10.1016/j.optcom.2015.05.015

Cited by 5 publications

(5 citation statements)

References 20 publications

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“…The sign, (+) or ( ), indicates the enhancement or quenching, respectively, of the fluorescence in the presence of the Au NPs. Thus, the FRET and SET mechanisms contribute to fluorescence quenching, which is consistent with work in the literature [20], and fluorescence enhancement occurs solely via CET [15]. To date, no theoretical explanation has been definitively provided for this effect.…”

Section: Resultssupporting

confidence: 87%

“…Note that regarding the condition for the value of c, we hope that this will be a quantitative proof for the enhancement of fluorescence. Using the proposed theoretical model, we re-examined the experimental results from a study of energy transfer between OBs and Au NPs [15]. The RET between the OBs and Au NP pairs results in initially enhanced fluorescence, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…However, the physical mechanism and computational models predicting these energy transfer mechanisms remain controversial. Recently, a "nano-wave emitter station and antenna" model was developed to explain the mechanism of FRET [15]. Strong fluorescence enhancement, which could be called gigantic energy transfer, was experimentally observed and shown to be effectively modeled by this approach.…”

Section: Introductionmentioning

confidence: 99%

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Accurate Model for Fluorescence Resonance Energy Transfer between Gold Nanoparticles and Cy3 Orange Beads

Lea

Hoangc

Nguyend

et al. 2020

Appl. Sci. Converg. Technol.

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We present an analytical method to model the influence of gold nanoparticle (Au NP) concentration on the energy transfer between Cy3 orange beads (OBs) and Au NPs. The OBs and Au NPs act as donor (D) and acceptor (A), respectively. In the D A system, the energy transfer efficiency strongly depends on the spectral overlap and separation R between donor and acceptor. Theoretical calculations for a range of R values between 10 and 100 Å produce three parameters that each characterize one of three different resonant energy transfer mechanisms: fluorescence resonant energy transfer, surface resonant energy transfer and Coulomb energy transfer. The values of these parameters provide estimates of the degree of quenching or enhancement of the fluorescence of D A complexes as a function of concentration. A comparison between experimental and theoretical data confirms the validity of the model.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accurate Model for Fluorescence Resonance Energy Transfer between Gold Nanoparticles and Cy3 Orange Beads

Lea

Hoangc

Nguyend

et al. 2020

Appl. Sci. Converg. Technol.

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“…The energy transfers between semiconductor QD and quenchers are mediated by two main methods based on the size of the latter. For a quencher with a radius smaller than 1.5 nm, the donor-acceptor (D-A) pair behaves as FRET (d -6 dependency) and if its higher nanometal surface energy transfer (NSET)-d -4 dependency-prevails because with higher radius the surface area increases [26,27]. Hence, the energy transfer efficiency for CdTe/ZnS core-shell QD and AuNP (1.4 nm) is given as FRET:…”

Section: Sensor Sensitivitymentioning

confidence: 99%

“…where k 2 =dipole orientation factor (0.66 isotropically oriented dipoles), J l ( )= spectral overlap integral and for the CdTe/ZnS QD emitting at 655 nm, and QD AE =0.67 [28] hence R o is generally found to be less than 10 nm [26]. Based on the value of QE and R o the effective distance between QD and Au-NP can be calculated.…”

Section: Sensor Sensitivitymentioning

confidence: 99%

Molecular beacon anchored onto a graphene oxide substrate

et al. 2017

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In this article, we report a graphene oxide-based nanosensor incorporating semiconductor quantum dots linked to DNA-aptamers that functions as a 'turn-off' fluorescent nanosensor for detection of low concentrations of analytes. A specific demonstration of this turn-off aptasensor is presented for the case of the detection of mercury (II) ions. In this system, ensembles of aptamer-based quantum-dot sensors are anchored onto graphene oxide (GO) flakes which provide a platform for analyte detection in the vicinity of GO. Herein, the operation of this ensemble-based nanosensor is demonstrated for mercury ions, which upon addition of mercury, quenching of the emission intensity from the quantum dots is observed due to resonance energy transfer between quantum dots and the gold nanoparticle connected via a mercury target aptamer. A key result is that the usually dominant effect of quenching of the quantum dot due to close proximity to the GO can be reduced to negligible levels by using a linker molecule in conjunctions with the aptamer-based nanosensor. The effect of ionic concentration of the background matrix on the emission intensity was also investigated. The sensor system is found to be highly selective towards mercury and exhibits a linear behavior (r > 0.99) in the nanomolar concentration range. The detection limit of the sensor towards mercury with no GO present was found to be 16.5 nM. With GO attached to molecular beacon via 14 base, 35 base, and 51 base long linker DNA, the detection limit was found to be 38.4 nM, 9.45 nM, and 11.38 nM; respectively.

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Using silicon-coated gold nanoparticles to enhance the fluorescence of CdTe quantum dot and improve the sensing ability of mercury (II)

Zhu

Chang

et al. 2018

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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The local field dependent effect of the critical distance of energy transfer between nanoparticles

Cited by 5 publications

References 20 publications

Accurate Model for Fluorescence Resonance Energy Transfer between Gold Nanoparticles and Cy3 Orange Beads

Accurate Model for Fluorescence Resonance Energy Transfer between Gold Nanoparticles and Cy3 Orange Beads

Molecular beacon anchored onto a graphene oxide substrate

Using silicon-coated gold nanoparticles to enhance the fluorescence of CdTe quantum dot and improve the sensing ability of mercury (II)

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