Effect of compartmentalization of donor and acceptor on the ultrafast resonance energy transfer from DAPI to silver nanoclusters

Prajapati, Roopali; Chatterjee, Surajit; Kannaujiya, Krishna K.; Mukherjee, Tushar Kanti

doi:10.1039/c6nr01792d

Cited by 18 publications

(9 citation statements)

References 75 publications

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“…A dilute scattering solution was used to record the instrument response function (IRF). The decays were analyzed using IBH DAS 6.0 software according to the literature reports. , Atomic force microscopy (AFM) measurements were performed on a clean coverslip using an AIST-NT microscope (SmartSPM-1000 model). The field-emission scanning electron microscopy (FESEM) and energy dispersive X-ray analysis (EDX) were performed using a Supra 55 Zeiss field-emission scanning electron microscope.…”

Section: Methodsmentioning

confidence: 99%

Quantum Dot-Based Hybrid Coacervate Nanodroplets for Ultrasensitive Detection of Hg²⁺

Singh

Vaishnav

Mukherjee

2020

ACS Appl. Nano Mater.

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Multifunctional organic–inorganic hybrid materials with inherent optical, electrical, and/or magnetic properties find tremendous importance in various fields such as sensing, photovoltaics, therapeutics, bioimaging, and light-emitting devices. Herein, we have fabricated membrane-free organic–inorganic hybrid luminescent coacervate nanodroplets and utilized them toward ultrasensitive detection and efficient removal of mercuric ions (Hg2+) simultaneously. The self-assembly of negatively charged mercaptosuccinic acid (MSA) capped CdTe quantum dots (QDs) in the presence of positively charged poly(diallyldimethylammonium chloride) (PDADMAC) leads to the formation of luminescent nanodroplets with average size of 430 ± 20 nm. Selective luminescence quenching of these nanodroplets has been observed only in the presence of Hg2+. It has also been observed that the presence of other metal ions does not interfere in the sensing process. Our findings reveal that Hg2+ ions specifically associate with the porous structure of these nanodroplets via electrostatic interactions with the free carboxylate groups of MSA ligands at the surface of CdTe QDs and undergo photoinduced electron transfer (PET) with photoexcited QDs. The limit of detection (LOD) for Hg2+ sensing with our present system is estimated to be 1.32 nM (0.26 ppb), which is significantly lower than most of the earlier reported self-assembled materials. Moreover, these hybrid nanodroplets efficiently sequester trace quantities of Hg2+ from contaminated water. The overall performance of our present system toward Hg2+ remediation is superior over most of the earlier reported hybrid nanocomposites in terms of fast uptake kinetics (within 15 min), ultrasensitive detection (LOD 0.26 ppb), and high sequestration efficiency (98.3%). With regard to our present findings in particular, the tailorability of surface ligands and inorganic nanoparticles in hybrid nanodroplets provide great advantage for the development of multifunctional nanomaterials for a diverse range of applications.

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Section: Methodsmentioning

confidence: 99%

Quantum Dot-Based Hybrid Coacervate Nanodroplets for Ultrasensitive Detection of Hg²⁺

Singh

Vaishnav

Mukherjee

2020

ACS Appl. Nano Mater.

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“…Nonradiative excitation energy transfer (EET) finds enormous importance in fundamental research as well as in various technology-related fields such as photovoltaics, , light-emitting diodes (LEDs), , sensors, , and bioimaging. , Therefore, Understanding and precise control over EET in nanoscale material is utmost important. Nonradiative Förster resonance energy transfer (FRET) via distance-dependent (<10 nm) dipole–dipole interactions has been extensively utilized to measure the dynamic changes in the distance between molecular donor–acceptor pairs in various complex macromolecular systems. − However, Over the last 2 decades, metal and semiconductor NPs based donor–acceptor nanocomposite systems have attracted considerable attention due to their size-dependent optoelectronic properties which allow easy tuning of various energy transfer related parameters. − More importantly, these nanocomposite systems offer great advantage over conventional dipole–dipole systems by surpassing the limited FRET distance due to the strong near field effect of metal NPs. − This strong plasmonic field of metal NPs finds enormous importance in enhancing the efficiency and performance of various nanophotonic devices such as photovoltaics, − LEDs, − and photodetectors. − …”

Section: Introductionmentioning

confidence: 99%

Long-Range Resonance Coupling-Induced Surface Energy Transfer from CdTe Quantum Dot to Plasmonic Nanoparticle

Vaishnav

Mukherjee

2018

J. Phys. Chem. C

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Fundamental understanding and precise control of complex nonradiative processes in nanoscale system finds significant interest in recent times due to their importance in various nanophotonics applications. Here we have systematically investigated the mechanism behind photoluminescence (PL) quenching of mercaptosuccinic acid (MSA) capped CdTe QDs in the near field of gold and silver nanoparticles (Au and Ag NPs) by using steady-state and time-resolved photoluminescence (PL) spectroscopy. Resonance coupling between excitonic emission and localized surface plasmon resonance (LSPR) of Au NPs has been tuned by varying the size of QDs. Herein, three differently sized MSA-capped CdTe QDs have been synthesized namely, 2.1 ± 0.7, 3.1 ± 0.4, and 3.9 ± 0.3 nm with emission in green, yellow and red region of the electromagnetic spectrum, respectively. It has been observed that both the luminescence intensity and lifetime of green QDs quench significantly in the near field of 20 nm sized Au NPs. In contrast, the luminescent intensity and lifetime of yellow and red QDs remain unaltered in the presence of Au NPs. Moreover, it has been observed that ligand exchange at the surface of Au NPs with Poly(ethylene glycol) methyl ether thiol (PEG-SH) decreases the quenching efficiency of the green QD-Au NP pair significantly. In addition, the extent of quenching strongly depends on excitation wavelength. The observed quenching is more efficient at the excitation wavelength close to the LSPR of Au NP. These results have been explained on the basis of a size-dependent nanometal surface energy transfer (NSET) model by incorporating the changes in the complex dielectric function and the absorptivity of the Au NP. On the contrary, irrespective of the sizes of QDs, significant PL quenching has been observed in the presence of 10 nm sized citrate-capped Ag NPs as a consequence of photoinduced electron transfer (PET). The present findings of size and wavelength-dependent long-range nonradiative electromagnetic coupling in hybrid QD-metal NP system can be useful to understand and optimize the performance of various nanophotonic devices.

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“…This S–H vibration peak is absent in all NCs due to formation of strong covalent Au–S bonds. So, it is confirmed from the analysis that the capping ligands are attached to the Au core through thiol ends . Additionally, a noticeable peak in the NCs at 3400 cm –1 may be attributed to the overlap of O–H and N–H stretching frequency of the ligands.…”

Section: Resultsmentioning

confidence: 64%

“…So, it is confirmed from the analysis that the capping ligands are attached to the Au core through thiol ends. 38 Additionally, a noticeable peak in the NCs at 3400 cm S8). In the MALDI spectrum of GSH-capped Au NCs, the high abundant species can be tentatively assigned as [Au 15 (GSH) 6 + 4H] 4+ (Figure S7).…”

Section: Resultsmentioning

confidence: 98%

Surface Ligand-Controlled Wavelength-Tunable Luminescence of Gold Nanoclusters: Cellular Imaging and Smart Fluorescent Probes for Amyloid Detection

Kundu

Ghosh

Nandi

et al. 2020

ACS Appl. Bio Mater.

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Gold nanoclusters (Au NCs) are an emerging class of fluorescent nanomaterials due to their fascinating chemical or physical properties and atomically precise structures; hence, they have been widely used in the field of biosensing and bioimaging. In this article, we demonstrate the green synthesis of orange, yellow, green, and cyan emitting Au NCs by core etching and ligand exchange methodology. Our investigation reveals that the chain length of the mercaptan acids, which are present on the surface of the Au NCs, controls the optical and electronic properties of the synthesized NCs. The steady-state and time-resolved spectroscopic data suggest that the emission properties of Au NCs mainly originate from the ligand to metal charge transfer (LMCT) transition. Alterations of the optical properties of these Au NCs can be proposed due to the difference in the core size of the Au NCs, which is strongly influenced by the surface-capping ligands. These NCs are highly biocompatible and nontoxic as evidenced by the cell viability and cellular uptake studies. By virtue of this, our as-synthesized NCs have been successfully used as excellent intracellular fluorescent imaging probes. Interestingly, fluorescence properties of Au NCs can efficiently probe the protein amyloids associated with several neurodegenerative diseases. To facilitate research in the field of amyloidosis, we have demonstrated fluorescence lifetime imaging microscopy (FLIM) and fluorescence correlation spectroscopy (FCS) as two advanced tools to probe the aggregation of proteins and to monitor the physical interactions between proteins and NCs. It has been observed that the hydrophobicity of the NC surface can trigger the amyloid detection capability of Au NCs. Owing to these unique optical and attractive biological properties coupled with the imaging capability, these ultrasmall-sized Au NCs may enable in vivo detection of amyloids in the near future.

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Effect of compartmentalization of donor and acceptor on the ultrafast resonance energy transfer from DAPI to silver nanoclusters

Cited by 18 publications

References 75 publications

Quantum Dot-Based Hybrid Coacervate Nanodroplets for Ultrasensitive Detection of Hg²⁺

Quantum Dot-Based Hybrid Coacervate Nanodroplets for Ultrasensitive Detection of Hg²⁺

Long-Range Resonance Coupling-Induced Surface Energy Transfer from CdTe Quantum Dot to Plasmonic Nanoparticle

Surface Ligand-Controlled Wavelength-Tunable Luminescence of Gold Nanoclusters: Cellular Imaging and Smart Fluorescent Probes for Amyloid Detection

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Effect of compartmentalization of donor and acceptor on the ultrafast resonance energy transfer from DAPI to silver nanoclusters

Cited by 18 publications

References 75 publications

Quantum Dot-Based Hybrid Coacervate Nanodroplets for Ultrasensitive Detection of Hg2+

Quantum Dot-Based Hybrid Coacervate Nanodroplets for Ultrasensitive Detection of Hg2+

Long-Range Resonance Coupling-Induced Surface Energy Transfer from CdTe Quantum Dot to Plasmonic Nanoparticle

Surface Ligand-Controlled Wavelength-Tunable Luminescence of Gold Nanoclusters: Cellular Imaging and Smart Fluorescent Probes for Amyloid Detection

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Quantum Dot-Based Hybrid Coacervate Nanodroplets for Ultrasensitive Detection of Hg²⁺

Quantum Dot-Based Hybrid Coacervate Nanodroplets for Ultrasensitive Detection of Hg²⁺