Metal Conjugated Semiconductor Hybrid Nanoparticle-Based Fluorescence Resonance Energy Transfer

Haldar, Krishna Kanta; Sen, Tuhinadri; Patra, Amitava

doi:10.1021/jp911348n

Cited by 79 publications

(72 citation statements)

References 41 publications

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“…Banin and coworkers demonstrated the lightinduced charge separation mechanism in Au-CdSe hybrid nanorods and reported, for the first time, the phenomenon of charge retention in such hybrid systems [19]. Patra and coworkers used time-resolved fluorescence spectroscopy to monitor the charge separation process in Au-CdSe hybrid nanocrystals [20].…”

Section: Introductionmentioning

confidence: 99%

Charge transfer and retention in directly coupled Au-CdSe nanohybrids

et al. 2011

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The energy and charge transfer dynamics of directly coupled Au-CdSe hybrid nanocrystals have been studied using time-resolved photoluminescence (PL) techniques. The PL of such nanohybrids was found to be quenched dramatically compared to that of both CdSe quantum dots and mixtures of CdSe quantum dots with Au nanoparticles. Fluorescence decay curves of the Au-CdSe nanohybrids show three distinct decay channels with the fastest one associated with the transfer of electrons from the CdSe portion to the Au portion. The holes on the CdSe portion created by such charge transfer were then quickly taken away by the solution, while the electrons on the Au portion slowly leaked into the solution as well, thus serving as a reductant for redox reactions. Using a model reaction based on the reduction of methylene blue by the leaking electrons, our photocatalytic experiments indicate that the electrons can be temporarily retained in the Au portion (most likely at the Au-capping agent interface) for a dramatically long timescale, up to 100 min. Finally, by merging all of the observations in the time-resolved PL measurements, we were able to figure out a relatively complete picture of charge transfer and retention in the Au-CdSe nanohybrids. This picture is expected to guide researchers in designing modern photocatalysts and solar cells constructed from nanoscale metal-semiconductor hybrids.

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Section: Introductionmentioning

confidence: 99%

Charge transfer and retention in directly coupled Au-CdSe nanohybrids

et al. 2011

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“…By understanding the distance and concentration dependence of a particular MNP-fluorophore system, the optimum conditions for high sensitivity can be determined. The distance, wavelength and concentration dependences of the quenching process of molecular dyes and QDs by MNPs can be analysed using theories describing non-radiative energy transfer between dipoles within both FRET [13][14][15] and NSET formalisms. 4,5,10 For many applications semiconductor QDs offer advantages over the typically used molecular dyes, such as their narrow and tunable emission lines, higher photostability and high quantum yields.…”

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confidence: 99%

Wavelength, Concentration, and Distance Dependence of Nonradiative Energy Transfer to a Plane of Gold Nanoparticles

Xia¹,

Marocico²,

Lunz³

et al. 2012

ACS Nano

143

175

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“…QDs as donors in FRET applications have been coupled to a range of acceptor materials for energy transfer studies, including fluorescent dyes, NMs (such as Au and carbon), fluorescent proteins, and polymers (Figure 6.26a) [79,184,283,462,482,513,516,517,520,524,[544][545][546][547][548]. As mentioned earlier, they are also adept FRET acceptors when coupled with the appropriate donors, such Figure 6.25 QD bioconjugation -an illustration of some selected surface chemistries and conjugation strategies that are applied to QDs.…”

Section: Semiconductor Nanocrystalsmentioning

confidence: 99%

Materials for FRET Analysis: Beyond Traditional Dye–Dye Combinations

Sapsford

Wildt

Mariani

et al. 2013

FRET – Förster Resonance Energy Transfer

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The intrinsic sensitivity (r 6 dependence) of F€ orster (or fluorescence) resonance energy transfer (FRET) to nanoscale changes in the donor/acceptor separation distance has made FRET an invaluable biophysical tool in a variety of applications, ranging from studying the structure and conformation of proteins and nucleic acids to examining biomolecular interactions, including its use in in vitro and in vivo bioassays [1][2][3][4][5][6][7]. While the myriad of FRET configurations and techniques currently in use are covered throughout this book, here we focus primarily on the materials utilized as donor or acceptor probes in FRET rather than the process itself [3,5,8,9]. Our 2006 review paper on this topic serves as the foundation for this updated chapter [3]. The materials were divided into three main categories: organic materials that include "traditional" dye fluorophores, dark quenchers, polymers, and carbon nanomaterials (NMs); inorganic materials such as metal chelates, metal, and semiconductor nanocrystals; and fluorophores of biological origin such as fluorescent proteins (FPs), amino acids, and fluorescence generated from enzymatic bioluminescence (BL) and chemiluminescence (CL). These materials may function as FRET donors and/or acceptors, depending upon experimental design. Many of the new materials developed and/or new donor-acceptor probe combinations used address some of the inherent complications of more traditional FRET materials, including photobleaching, spectral cross talk, and direct excitation of the acceptor species, and examples of these will be highlighted and discussed throughout the chapter. Since the vast majority of FRET applications are biological in nature, they routinely involve some type of biomolecule labeling strategy, which ultimately plays a significant and fundamental role in the success and interpretation of the resulting FRET. Therefore, we begin the chapter with a brief discussion of the bioconjugation techniques commonly utilized for FRET and points to consider, followed by sections highlighting the current and emerging materials that are used, or have the potential to be used, in FRET applications.

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Metal Conjugated Semiconductor Hybrid Nanoparticle-Based Fluorescence Resonance Energy Transfer

Cited by 79 publications

References 41 publications

Charge transfer and retention in directly coupled Au-CdSe nanohybrids

Charge transfer and retention in directly coupled Au-CdSe nanohybrids

Wavelength, Concentration, and Distance Dependence of Nonradiative Energy Transfer to a Plane of Gold Nanoparticles

Materials for FRET Analysis: Beyond Traditional Dye–Dye Combinations

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