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Deposition of Cu nanoclusters produced by compact gas aggregation nanocluster source without size filtration is investigated. The main emphasis is given to the determination of influence of operating conditions (pressure in the ag...
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Deposition of Cu nanoclusters produced by compact gas aggregation nanocluster source without size filtration is investigated. The main emphasis is given to the determination of influence of operating conditions (pressure in the aggregation and deposition chambers, magnetron current) on deposition rate of Cu nanoclusters as well as on the evaluation of their size distribution and chemical structure. Subsequently, possibility to employ this nanocluster source for fabrication of Cu nanodusters/plasma polymer multilayer nanocomposites was tested. It is shown that by step-by-step deposition of layers of Cu nanoclusters and plasma polymer it is possible to control not only amount of Cu nanoclusters incorporated into plasma polymer, but also roughness, wettability and optical properties of resulting coatings without affecting their surface chemical composition.
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Herein, we have developed a novel kind of electrochemiluminescence (ECL) biosensor for BRCA detection. Based on the metal ion-induced enhancement mechanism, high luminous Cu:Al nanoclusters (Cu:Al NCs) was obtained as ECL nanoprob...
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Herein, we have developed a novel kind of electrochemiluminescence (ECL) biosensor for BRCA detection. Based on the metal ion-induced enhancement mechanism, high luminous Cu:Al nanoclusters (Cu:Al NCs) was obtained as ECL nanoprobe. Moreover, the polydopamine (PDA) biomimetic film with CeO2 NPs was constructed as a sensing platform. The structure of the biomimetic film can provide a strong affinity to link biomolecules and functional nanoparticles. Meanwhile, the good ionic permeability of PDA film was in favor of the charge transfer in the ECL reaction on the electrode surface. In addition, CeO(2 )NPs on the biomimetic film further improved the ECL reaction efficiency. Therefore, this sensor was successfully applied in the detection of BRCA in the clinic serum sample. The current study has provided a feasible and reliable method for biochemical analysis and clinical detection.
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An effective strategy is developed to synthesize high-nuclearity Cu clusters, [Cu-53(RCOO)(10)(C equivalent to CtBu)(20)Cl2H18](+) (Cu-53), which is the largest Cu-I/Cu-0 cluster reported to date. Cu powder and Ph2SiH2 are employe...
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An effective strategy is developed to synthesize high-nuclearity Cu clusters, [Cu-53(RCOO)(10)(C equivalent to CtBu)(20)Cl2H18](+) (Cu-53), which is the largest Cu-I/Cu-0 cluster reported to date. Cu powder and Ph2SiH2 are employed as the reducing agents in the synthesis. As revealed by single-crystal diffraction, Cu-53 is arranged as a four-concentric-shell Cu-3@Cu10Cl2@Cu-20@Cu-20 structure, possessing an atomic arrangement of concentric M-12 icosahedral and M-20 dodecahedral shells which popularly occurs in Au/Ag nanoclusters. Surprisingly, Cu-53 can be dissolved in diethyl ether and spin coated to form uniform nanoclusters film on organolead halide perovskite. The cluster film can subsequently be converted into high-quality CuI film via in situ iodination at room temperature. The as-fabricated CuI film is an excellent hole-transport layer for fabricating highly stable CuI-based perovskite solar cells (PSCs) with 14.3 % of efficiency.
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A new and simple route to synthesize Lead sulfide (PbS) crystals with the clover-like structure was described in the current paper. PbS was prepared in a simple aqueous solution employing (CH3COO)(2)Pb and thiourea as the initial ...
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A new and simple route to synthesize Lead sulfide (PbS) crystals with the clover-like structure was described in the current paper. PbS was prepared in a simple aqueous solution employing (CH3COO)(2)Pb and thiourea as the initial materials under 130 W microwave irradiation. No any surfactant or template including organic polyamines with N-chelation property was needed. The phase and composition of the product were identified by X-ray powder diffraction (XRD) and X-ray photoelectron spectra (XPS). TEM observation showed that the product with the six-petal flower-shaped structures was obtained, but SEM observation confirmed the clover-like structure of the product; and the six-petal flowers were formed via the overlap of two clovers revolved 60degrees around the center of the flower. Some factors affected the shape of the final product were studied and the optical properties of PbS crystals with the clover-like structure were measured. [References: 22]
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The microstructure of copper-carbon Cu/a-C:H nanocomposites formed by plasma-enhanced chemical vapor deposition has been determined by transmission electron microscopy. The formation of spherical copper inclusions embedded in the ...
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The microstructure of copper-carbon Cu/a-C:H nanocomposites formed by plasma-enhanced chemical vapor deposition has been determined by transmission electron microscopy. The formation of spherical copper inclusions embedded in the matrix of amorphous carbon was observed. The average size of the copper inclusions decreases from 16 to 5 nm on increasing the carbon concentration from 8 to 75 at.%. A description of the copper clusters formation processes in the reactor chamber was proposed. The results of calculation of the average size of copper clusters are in good agreement with the observed size of the copper inclusions formed in nanocomposite thin films.
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We report the investigation of morphology and composition of copper nanocluster films deposited on Si substrates. The nanoclusters are formed in an aggregation tube at room temperature and magnetron sputtering source is used to ge...
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We report the investigation of morphology and composition of copper nanocluster films deposited on Si substrates. The nanoclusters are formed in an aggregation tube at room temperature and magnetron sputtering source is used to get negatively charged Cu-clusters' beam which is subsequently mass-filtered to get size-selected cluster on the substrates as soft-landing process of deposition. For composition of the films, X-ray photoelectron spectroscopy (XPS) technique is used. For morphological changes of the films both scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses are carried out Additionally, Energy Dispersive X-ray (EDX) spectra support the compositional and structural informations of the film. The analysis of Cu nanoclusters' films reveals that initial nucleation of Cu clusters takes place in the form of isolated islands and the arrival of subsequent Cu clusters onto Si substrates has preferential aggregation around the preceding clusters forming a mound structure. (C) 2008 Elsevier Ltd. All rights reserved.
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In this study the possibility to employ magnetron-based gas aggregation source for the effective and facile production of mesoporous vanadium films composed of individual vanadium nanoparticles is investigated. It is demonstrated ...
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In this study the possibility to employ magnetron-based gas aggregation source for the effective and facile production of mesoporous vanadium films composed of individual vanadium nanoparticles is investigated. It is demonstrated that due to the high deposition rate of V nanoparticles under optimized conditions, their low impact energies, and the directionality of the deposition process, it is possible not only to produce porous nanoparticle coatings, but also coatings with columnar structures. Furthermore, it is shown that such produced coatings may be easily transformed into vanadium pentoxide ones by their annealing in air at the temperature of 550 ?C, without loosening the mesoporous character of resulting films.
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PbS microcrystals with a magic-square-shaped structure were successfully fabricated via a simple hydrothermal route, employing (CH3COO)(2)Pb and Na2S2O3 as the lead and sulfur source without the assistance of any surfactant or tem...
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PbS microcrystals with a magic-square-shaped structure were successfully fabricated via a simple hydrothermal route, employing (CH3COO)(2)Pb and Na2S2O3 as the lead and sulfur source without the assistance of any surfactant or template. S2O32- ions acted not only a supplier of S2- ions but also a coordinating reagent. The formation of the above morphology was the direct result of the coordination between thiosulfate ions and lead ions. Researches indicated that the different synthetic approach could influence the morphology of the final product. A possible formation mechanism was suggested. (C) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Ion beam sputtering has been used to prepare Ag/Cu, Ag and Cu nanoclusters embedded in a Si3N4 dielectric matrix with the goal to correlate structural information and optical properties. The optical transmittance spectra of the bi...
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Ion beam sputtering has been used to prepare Ag/Cu, Ag and Cu nanoclusters embedded in a Si3N4 dielectric matrix with the goal to correlate structural information and optical properties. The optical transmittance spectra of the bimetallic nanoclusters are compared with those obtained in the case of the single metallic nanocermets in the as-deposited state. The influence of a post annealing treatment, at different temperatures, on the optical properties of the bimetallic nanocermets is also discussed. The nanocluster structure has been investigated by X-ray absorption spectroscopy and X-ray diffraction. The chemical composition has been analysed by Rutherford backscattering spectroscopy. The surface plasmon resonance occurring after annealing in a definite temperature range is interpreted as due to the specific atomic arrangement resulting from this treatment. (c) 2006 Elsevier B.V. All rights reserved.
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Metal nanocluster composite glass prepared by 200 keV Ag ions' implantation into silica with dose of 2 x 10(17) ions/cm(2) has been studied. The formation of sandwiched nanocluster-nanovoid-nanocluster structures has been evidence...
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Metal nanocluster composite glass prepared by 200 keV Ag ions' implantation into silica with dose of 2 x 10(17) ions/cm(2) has been studied. The formation of sandwiched nanocluster-nanovoid-nanocluster structures has been evidenced by in situ transmission electron microscopy experiment (TEM). Fast nonlinear optical refraction and nonlinear optical absorption coefficients were measured at 532 nm and 1064 nm of wavelength by the Z-scan technique. The third-order nonlinear susceptibility chi((3)) of this kind of sample was determined to be 4.0 x 10(-8) esu at 532 nm and 9.0 x 10(-8) esu at 1064 nm, respectively. Published by Elsevier Ltd.
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