Ligand exchange offers an effective way to modify the properties of recently prepared quantum clusters gold. To tune optical and photoluminescence one most stable gold, Au25SG18 (SG-glutathione thiolate), we functionalized it by −SG with -SG altogether different ligand, namely, 3-mercapto-2-butanol (MB). The products were characterized various techniques such as absorption (UV−vis), Fourier-transform infrared (FT-IR), nuclear magnetic resonance (NMR), X-ray photoelectron (XPS), luminescence...

We have prepared Au15 quantum clusters anchored to α-, β-, and γ-cyclodextrin (CD) cavities. The synthesis process involves the core etching of larger simultaneous trapping formed inside CD were characterized by various tools, such as optical absorption luminescence spectroscopies, electrospray ionization−mass spectrometry (ESI-MS), X-ray photoelectron spectroscopy (XPS), circular dichroism spectroscopy, two-dimensional nuclear magnetic resonance (2D NMR) spectroscopy. Trapping cluster in...

A highly luminescent freestanding film composed of the quantum cluster, Au(15), was prepared. We studied utility material for specific metal ion detection. The sensitivity red emission cluster in composite to Cu(2+) has been used make a sensor, similar pH paper. luminescence stable when exposed several other ions such as Hg(2+), As(3+), and As(5+). exhibited visual up 1 ppm, which is below permissible limit (1.3 ppm) drinking water set by U.S. environmental protection agency (EPA)....

Multimodal and multifunctional nanomaterials are promising candidates for bioimaging therapeutic applications in the nanomedicine settings. Here we report preparation of photouncaging nanoparticles with fluorescence magnetic modalities evaluation their potentials vitro vivo bioimaging. Photoactivation such bimodal prepared using ligands, CdSe/ZnS quantum dots, super paramagnetic iron oxide results systematic uncaging particles, which is correlated continuous changes absorption, mass NMR...

We synthesized fluorescent, porphyrin-anchored, Au22 clusters in a single step, starting from well-characterized Au25 protected with glutathione (−SG) by combined core reduction/ligand exchange protocol, at liquid−liquid interface. The prepared cluster was characterized UV/vis, photoluminescence, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy, elemental analysis, and matrix-assisted laser desorption ionization mass spectrometry. absence of 672 nm intraband transition...

Nanoprobes based on quantum clusters (QC) with near-infrared fluorescence, magnetic-resonance-imaging contrast, and singlet-oxygen-sensitized intracellular fluorescence are studied. The generation of singlet oxygen uncaging by magnetic NIR-emitting nanoparticles exploited for multimodal bioimaging in vitro.

Monolayer thiol-protected noble metal nanoclusters are attractive nanoscale building blocks for well-defined colloidal superstructures. However, achieving facile reversible self-assembly of using external stimuli is still in its infancy. Herein, we report the synthesis and photon-assisted thiolated azobenzene-stapled Au25 nanoclusters. Photoactivation functionalized dichloromethane by irradiating ultraviolet light at 345 nm results a visual change formation disc-like superstructures (d ∼...

Quantum dots-based electron donor-acceptor systems play a rising role in the design of renewable and carbon-free energy harvesting technologies. In this article, we discuss photofabrication fullerene-shelled quantum dots supramolecular nanoparticles, which fullerene shell acts as not only well-defined acceptor but also robust protecting layer against photocorrosion dot core. We evaluate ensemble single-molecule transfer from core to nanoparticles photocurrent response photoelectrochemical...

Despite tremendous progress in the field of fluorescence-based anticounterfeiting, advanced anticounterfeiting techniques are still posing challenges all over world due to their cost and reliability. Recently, light-emitting atomically precise nanoclusters have emerged as attractive building blocks because well-defined structure, function, stable photoluminescence. Herein, we report room temperature fabrication a stable, flexible, nontoxic, low-cost precision nanocluster-based luminescent...

Glutathione protected Au25 quantum clusters, exhibiting characteristic fluorescence, have been uniformly coated inside and outside of β-Ala-L-Ile dipeptide nanotubes. These structures imaged using the inherent fluorescence Au25. Upon exposure to an electron beam, in a transmission microscope, clusters gradually transform gold nanoparticles, metallic size regime. The nanoparticles grow 4.5 nm thereafter particle is unaffected by beam exposure. nanotubes are intact this template shown control...

Atomically precise nanoclusters (NCs) have recently emerged as ideal building blocks for constructing self-assembled multifunctional superstructures. The existing structures are based on various non-covalent interactions of the ligands NC surface, resulting in inter-NC interactions. Despite recent demonstrations light-induced reversible self-assembly, long-range self-assembly dynamic covalent chemistry surface has yet to be investigated. Here, it is shown that Au25 NCs containing thiolated...

3D superlattices of fluorescent gold nanoparticles are prepared at an air/water interface. The hexagonal assembly extends over several micrometers, and crystals triangular morphology imaged using the fluorescence emission monolayers protecting (see figure). Surprisingly, even though fluorescein derivative is close to metallic core strong quenching expected. Detailed facts importance specialist readers published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or...

The study presents the first example of an adsorbed carbon monoxide (CO) enabled self-terminated Au-grafting on triphenylphosphine (PPh

We developed a cheap and rapid method for the fabrication of 3D nanoparticle superlattices (SLs) Au@SGAN Au@MSA (N-acetyl glutathione (SGAN) mercaptosuccinic acid (MSA) protected gold nanoparticles, respectively) in gram scale, at liquid−liquid interfaces under flowing nitrogen gas. While available methods take several weeks to make crystalline SLs, present route makes them day. Morphology these crystals was examined with scanning electron microscopy (SEM), their structures were probed using...

Fluorescent three-dimensional (3-D) superlattices of dansyl glutathione protected gold nanoparticles, with potential applications in molecular detection, have been synthesized at an air/water interface by controlling the pH nanoparticle suspension. The number fluorophores per was calculated to be ∼127. Morphologies superlattice crystals were examined using scanning electron microscopy (SEM). Most observed triangular shape. High-resolution transmission (HRTEM) and small angle X-ray scattering...

We show that the third order optical nonlinearity of 15-atom gold clusters is significantly enhanced when in contact with indium tin oxide (ITO) conducting film.Open and close aperture z-scan experiments together non-degenerate pump-probe differential transmission were done using 80 fs laser pulses centered at 395 nm 790 on encased inside cyclodextrin cavities.We two photon absorption coefficient by an magnitude as compared to are pristine glass plate.The enhancement for nonlinear refraction...

The synthesis, sorting, and characterization of monodisperse gold nanorods with dimensions around 10 nm in length below 6 diameter is reported. They display tunable plasmon resonance the near infrared, a region where cellular absorption reduced. A dual color photothermal microscope developed to demonstrate that they are promising single molecule probes for bioimaging. Over last decade, single-molecule optical microscopy has become gold-standard approach decipher complex molecular processes...

Multimodal and multifunctional contrast agents receive enormous attention in the biomedical imaging field. Such are routinely prepared by incorporation of organic molecules inorganic nanoparticles (NPs) into host materials such as gold NPs, silica polymer liposomes. Despite their non-cytotoxic nature, large size these NPs limits vivo distribution clearance inflames complex pharmacokinetics, which hinder regulatory approval for clinical applications. Herein, we report a unique method that...

Effect of ligand exchange on the optical and photoluminescence properties Au 25 SG 18 ( -glutathione thiolate) clusters was investigated. A fluorescein-based dye, 5-((2-(and-3)-S-(acetylmercapto)succinoyl)amino)-fluorescein (SAMSA) anchored water soluble by place reaction solid-state emission product studied. Inherent fluorescence image these mapped. Organic SC 2 H 4 Ph were synthesized as a model system which also showed temperature-dependent emission, in good agreement with results from clusters.

Nanosonden aus Quantenclustern (QC), die Nahinfrarot(NIR)-Fluoreszenz, Kernspintomographiekontrast und Singulett-Sauerstoff-sensibilisierte intrazelluläre Fluoreszenz aufweisen, werden vorgestellt. Die Herstellung von Singulett-Sauerstoff Freisetzung durch magnetische NIR-emittierende Nanopartikel in multimodalen, bildgebenden In-vitro-Verfahren verwendet.

Mercaptosuccinic acid protected gold nanoparticles (Au@MSA) self assemble to form superlattice (SL) crystals at the air-water interface. These have been used for gas adsorption. The current-voltage (I-V) characteristics of SL film with embedded crystals, obtained by four probe measurements, show Ohmic conduction. conductance observed was proportional polarizability adsorbed gases. current through decreases on adsorption along decrease in SERS intensity a molecule from crystals. We...