Adenosine monophosphate-capped gold(<scp>i</scp>) nanoclusters: synthesis and lanthanide ion-induced enhancement of their luminescence

Vanegas, Julie P.; Zaballos-García, Elena; González‐Béjar, María; Londoño-Larrea, Pablo; Pérez‐Prieto, Julia

doi:10.1039/c6ra01891b

Cited by 22 publications

(17 citation statements)

References 29 publications

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“…Although the cations might reduce the Debye length of the electrostatically charged nanoparticles, the self‐assembly cannot be explained based on solely screening effects in the applied ionic strength range as the control experiments show (applying NaCl instead of YCl 3 or YbCl 3 ). These findings are in good agreement with the revealed effect of the lanthanides on the surface of gold nanoparticles modified by MPA and MUA [ 44,47 ] and emphasize the importance of the ligand replacements process in the framework of our self‐assembly experiments.…”

Section: Resultssupporting

confidence: 89%

A Versatile Route to Assemble Semiconductor Nanoparticles into Functional Aerogels by Means of Trivalent Cations

Zámbó

Schlosser

Rusch

et al. 2020

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can be achieved precisely, and the variety of appearance and functionality of the nanoparticles has extended the application possibilities of this material class in the fields of sensing, [2,3] energy harvesting, [4] (photo) catalysis, [5,6] photovoltaics, [7] and biomedicine. [8] Metal chalcogenides are excellent candidates for fulfilling the requirements of the above-mentioned fields of applications, due to the well-known quantum size effect emerging in their systems consisting of nanoscaled building blocks. This phenomenon endows these nanoparticle systems with unique and tunable optical properties. [9] The most widely used class of semiconductor nanoparticles is cadmiumchalcogenides, especially the CdSe/CdS and CdSe/CdTe heteroparticles in diverse size, shape, and functionality. [10] Most importantly, the high surface-to-volume ratio of nanocrystals further enhances the activity and applicability of them. Nevertheless, there are numerous fields, where liquid-based nanoparticle systems cannot be utilized, that has enhanced the development of different self-assembly procedures providing supported or non-supported superstructures. Two main objectives govern the preparation of these assemblies: i) the preservation of the individual nanocrystal properties and ii) the extension of these optical and physicochemical properties in the self-assembled nanosystems to pave the way toward new applications. In other words, novel nanoparticlebased superstructures should combine the properties of the building blocks and the emerging new features that can be 3D nanoparticle assemblies offer a unique platform to enhance and extend the functionality and optical/electrical properties of individual nanoparticles. Especially, a self-supported, voluminous, and porous macroscopic material built up from interconnected semiconductor nanoparticles provides new possibilities in the field of sensing, optoelectronics, and photovoltaics. Herein, a method is demonstrated for assembling semiconductor nanoparticle systems containing building blocks possessing different composition, size, shape, and surface ligands. The method is based on the controlled destabilization of the particles triggered by trivalent cations (Y 3+ , Yb 3+ , and Al 3+ ). The effect of the cations is investigated via X-ray photoelectron spectroscopy. The macroscopic, self-supported aerogels consist of the hyperbranched network of interconnected CdSe/ CdS dot-in-rods, or CdSe/CdS as well as CdSe/CdTe core-crown nanoplatelets is used to demonstrate the versatility of the procedure. The non-oxidative assembly method takes place at room temperature without thermal activation in several hours and preserves the shape and the fluorescence of the building blocks. The assembled nanoparticle network provides longer exciton lifetimes with retained photoluminescence quantum yields, that make these nanostructured materials a perfect platform for novel multifunctional 3D networks in sensing. Various sets of photoelectrochemical measurements on the interconnected semiconductor nanorod s...

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Section: Resultssupporting

confidence: 89%

A Versatile Route to Assemble Semiconductor Nanoparticles into Functional Aerogels by Means of Trivalent Cations

Zámbó

Schlosser

Rusch

et al. 2020

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“…The reaction of AuNC naked with AMP failed to lead to luminescent NCs. We have previously reported the preparation of luminescent AuNC@AMP/HEPES (hydroxyethyl piperazineethanesulfonic acid) by reaction of HAuCl 4 with HEPES in the presence of AMP and shown that AMP was anchored to the NC surface through the phosphonate group . We presumed that the role of HEPES was not only to act as the reductant but also to avoid the multichelating attachment of AMP to the NC surface.…”

Section: Figurementioning

confidence: 99%

Water‐Soluble Naked Gold Nanoclusters Are Not Luminescent

Londoño-Larrea

Vanegas

Cuaran-Acosta

et al. 2017

Chemistry A European J

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Here, the synthesis of water-dispersible naked gold nanoclusters (AuNC ) is reported by a simple reduction of HAuCl with NaOH at room temperature, and it is shown that they are non-luminescent. They are then easily passivated with different thiols and adenosine monophosphate, leading to luminescent NCs. This is an important finding because the photoluminescence of the passivated NCs can now be clearly attributed to the ligand-AuNC surface interaction. These results are also highly relevant from the point of view of the preparation of luminescent NCs from the same NC batch. This strategy can be valuable for the preparation of a broad range of nano(bio)composites.

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“…The sample was thermostated for 24 h at 37 ºC. Finally, the synthesized AMP-Au NCs were purified by precipitation with acetone [31] and centrifugation (15000 rpm/30 min). After purification (removal of excess AMP), the Au NCs were redispersed in Milli-Q water.…”

Section: Preparation Of Amp-au Ncs and Amp-au Npsmentioning

confidence: 99%

Nucleotide-directed syntheses of gold nanohybrid systems with structure-dependent optical features: Selective fluorescence sensing of Fe3+ ions

Ungor

Csapó

Kismárton

et al. 2017

Colloids and Surfaces B: Biointerfaces

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This study demonstrates a one-step synthesis for the preparation of both adenosine monophosphate (AMP)-stabilized colloidal gold nanoparticles (AMP-Au NPs) and fluorescent gold nanoclusters (AMP-Au NCs). The dominant role of AMP:AuCl molar ratios in the formation of diverse nanosized Au products was proved. The size, the structure and the unique structure-dependent optical properties of the NPs and NCs were determined based on the results of numerous spectroscopic (UV-vis, fluorescence, infrared, x-ray photoelectron), high resolution electron microscopy (HRTEM) and dynamic light scattering (DLS) techniques. Stabile AMP-Au NPs with diameter of ca. 11nm and ultra-small AMP-Au NCs having blue fluorescence (λ=480nm) were identified. In addition, the AMP-Au NCs have been utilized to develop a selective sensor for the detection of Fe ions in aqueous medium based on fluorescence quenching. Several essential metal ions and anions have been tested but our results clearly supported that dominant quenching was observed only for Fe ions. Based on the determined limit of detection (LOD=2.0μM) our system is capable of detecting Fe ions in drinking water. The Stern-Volmer constants (K) and various thermodynamic parameters (ΔG, ΔH°, ΔS°, ΔC) of the quenching process have also been determined by the Stern-Volmer fitting of the fluorescence data in order to better understand the quenching mechanism.

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Adenosine monophosphate-capped gold(i) nanoclusters: synthesis and lanthanide ion-induced enhancement of their luminescence

Abstract: Reduction of Au3+ in the presence of just AMP and HEPES, combined with light exposure, gives rise to luminescent, water-soluble Au+ nanoclusters. Their photoluminescence is considerably enhanced by adding Y3+ or Yb3+, which leads to Au+/Y3+ and Au+/Yb3+ NCs, respectively.

Cited by 22 publications

References 29 publications

A Versatile Route to Assemble Semiconductor Nanoparticles into Functional Aerogels by Means of Trivalent Cations

A Versatile Route to Assemble Semiconductor Nanoparticles into Functional Aerogels by Means of Trivalent Cations

Water‐Soluble Naked Gold Nanoclusters Are Not Luminescent

Nucleotide-directed syntheses of gold nanohybrid systems with structure-dependent optical features: Selective fluorescence sensing of Fe3+ ions

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