Irradiation- and thermoinduced synthesis of Ag nanoparticles within amphiphilic carbosilane-thioether dendrimers

Chen, Li; Andersson, Theodore E.; Rissing, Christiana Julia; Yang, Shengyang; Su, Chen; Son, David Y.

doi:10.1039/c2tb00279e

Cited by 21 publications

(18 citation statements)

References 60 publications

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“…35 The peak at 533.5 eV is likely to be due to water molecules on the surface. 36 Fig. 5d show that N1S peaks appeared at 395.7, 397.9, 400 eV which indicate nitrogen incorporation.…”

Section: ð1þmentioning

confidence: 91%

An eco-friendly, highly stable and efficient nanostructured p-type N-doped ZnO photocatalyst for environmentally benign solar hydrogen production

et al. 2012

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We have investigated an economical green route for the synthesis of a p-type N-doped ZnO photocatalyst by a wet chemical method. Significantly, hazardous H 2 S waste was converted into eco-friendly hydrogen energy using the p-type N-doped ZnO photocatalyst under solar light, which has previously been unattempted. The as-synthesized p-type N-doped ZnO shows a hexagonal wurtzite structure. The optical study shows a drastic shift in the band gap of the doped ZnO in the visible region (3.19-2.3 eV). The doping of nitrogen into the ZnO lattice is conclusively proved from X-ray photoelectron spectroscopy analysis and Raman scattering. The morphological features of the N-doped ZnO are studied from FESEM, TEM and reveal particle sizes to be in the range of ∼4-5 nm. The N-doped ZnO exhibits enhanced photocatalytic hydrogen generation (∼3957 μmol h −1 ) by photodecomposition of hydrogen sulfide under visible light irradiation, which is much higher as compared to semiconductor metal oxides reported so far. It is noteworthy that a green catalyst is investigated to curtail H 2 S pollution along with production of hydrogen (green fuel) using solar light, i.e., a renewable energy source. The green process investigated will have the potential to synthesize other N-doped metal oxides.

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“…35 The peak at 533.5 eV is likely to be due to water molecules on the surface. 36 Fig. 5d show that N1S peaks appeared at 395.7, 397.9, 400 eV which indicate nitrogen incorporation.…”

Section: ð1þmentioning

confidence: 91%

An eco-friendly, highly stable and efficient nanostructured p-type N-doped ZnO photocatalyst for environmentally benign solar hydrogen production

et al. 2012

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“…However, the coordination ability of thioether and sulfonate functions in dendrons could compete with this focal point and hamper the formation of the desired type of AuNPs, as discussed above. For example, sulfonate thioether–carbosilane dendrimers have been used to stabilize AgNPs . We previously studied the ability of peripheral sulfonate groups to coordinate Cu II cations in anionic carbosilane dendrimers by EPR spectroscopy; the coordination mode is dependent upon the SO 3 − /Cu II molar ratio .…”

Section: Resultsmentioning

confidence: 99%

“…For example, sulfonate thioether-carbosilane dendrimersh ave been used to stabilizeA gNPs. [68] We previously studied the ability of peripheral sulfonate groups to coordinate Cu II cations in anionic carbosilane dendrimers by EPR spectroscopy;t he coordination mode is dependentu pon the SO 3 À /Cu II molar ratio. [56,57] With this in mind, and with the aim of confirmingt he type of interaction between the gold surface and dendrons, we investigated dendrons 4-6 and NPs 7a and 7b-9b by means of computer-aideda nalysiso ft he EPR spectra obtainedb ya dding increasing amountso fC u II with respect to afixed amount of sulfonate groups (0.01 m).…”

Section: Synthesis Of Aunpsmentioning

confidence: 99%

Dendronized Anionic Gold Nanoparticles: Synthesis, Characterization, and Antiviral Activity

Peña-González

García-Broncano

Ottaviani

et al. 2016

Chemistry A European J

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Anionic carbosilane dendrons decorated with sulfonate functions and one thiol moiety at the focal point have been used to synthesize water-soluble gold nanoparticles (AuNPs) through the direct reaction of dendrons, gold precursor, and reducing agent in water, and also through a place-exchange reaction. These nanoparticles have been characterized by NMR spectroscopy, TEM, thermogravimetric analysis, X-ray photoelectron spectroscopy (XPS), UV/Vis spectroscopy, elemental analysis, and zeta-potential measurements. The interacting ability of the anionic sulfonate functions was investigated by EPR spectroscopy with copper(II) as a probe. Different structures and conformations of the AuNPs modulate the availability of sulfonate and thiol groups for complexation by copper(II). Toxicity assays of AuNPs showed that those produced through direct reaction were less toxic than those obtained by ligand exchange. Inhibition of HIV-1 infection was higher in the case of dendronized AuNPs than in dendrons.

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“…The nanoclusters were smaller than 5 nm and fluoresced in the visible to near-infrared (NIR) region. Because of their long lifetime, large Stokes shift, and biocompatibility, these NCs represent an interesting material for sensing and imaging [ 93 ]. Tan, et al further exploited the use of multidentate thioether-terminated poly-(methacrylic acid) (PTMP–PMAA) as capping ligand to produce metal nanoclusters ( Figure 7 ).…”

Section: Fluorescent Metal Nanoclustersmentioning

confidence: 99%

Design and Utility of Metal/Metal Oxide Nanoparticles Mediated by Thioether End-Functionalized Polymeric Ligands

Razzaque

Hussain

et al. 2016

Polymers

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Abstract:The past few decades have witnessed significant advances in the development of functionalized metal/metal oxide nanoparticles including those of inorganic noble metals and magnetic materials stabilized by various polymeric ligands. Recent applications of such functionalized nanoparticles, including those in bio-imaging, sensing, catalysis, drug delivery, and other biomedical applications have triggered the need for their facile and reproducible preparation with a better control over their size, shape, and surface chemistry. In this perspective, the multidentate polymer ligands containing functional groups like thiol, thioether, and ester are important surface ligands for designing and synthesizing stable nanoparticles (NPs) of metals or their oxides with reproducibility and high yield. These ligands have offered an unprecedented control over the particle size of both nanoparticles and nanoclusters with enhanced colloidal stability, having tunable solubility in aqueous and organic media, and tunable optical, magnetic, and fluorescent properties. This review summarizes the synthetic methodologies and stability of nanoparticles and fluorescent nanoclusters of metals (Au, Ag, Cu, Pt, and other transition metal oxides) prepared by using thioether based ligands and highlights their applications in bio-imaging, sensing, drug delivery, magnetic resonance imaging (MRI), and catalysis. The future applications of fluorescent metal NPs like thermal gradient optical imaging, single molecule optoelectronics, sensors, and optical components of the detector are also envisaged.

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Irradiation- and thermoinduced synthesis of Ag nanoparticles within amphiphilic carbosilane-thioether dendrimers

Cited by 21 publications

References 60 publications

An eco-friendly, highly stable and efficient nanostructured p-type N-doped ZnO photocatalyst for environmentally benign solar hydrogen production

An eco-friendly, highly stable and efficient nanostructured p-type N-doped ZnO photocatalyst for environmentally benign solar hydrogen production

Dendronized Anionic Gold Nanoparticles: Synthesis, Characterization, and Antiviral Activity

Design and Utility of Metal/Metal Oxide Nanoparticles Mediated by Thioether End-Functionalized Polymeric Ligands

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