Topic
Nanoparticle
About: Nanoparticle is a research topic. Over the lifetime, 85905 publications have been published within this topic receiving 2689382 citations. The topic is also known as: nanoparticles.
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TL;DR: Surfactant-free Pd nanoparticles, immobilized to a metal-organic framework (MIL-101), have been used for the first time as highly active and durable catalysts in water for biomass refining with metal nanoparticle size- and location-dependent catalytic activity and selectivity.
69 citations
TL;DR: The ideal size and monodispersity of nanoparticles can be obtained at the smaller w value and lower concentration of Cu(2+) solution.
69 citations
TL;DR: Graphene/zinc oxide nanocomposite was synthesised via a facile, green and efficient approach consisted of novel liquid phase exfoliation and solvothermal growth for sensing application and results clearly indicate that zinc oxide particles were homogenously distributed on graphene sheets, without any severe aggregation.
69 citations
TL;DR: In this paper, polyvinyl alcohol (PVA)-In2O3 (with 1 and 5 wt% loading) nanocomposite films have been prepared by a solvent-casting technique.
Abstract: Poly(vinyl alcohol) (PVA)–In2O3 (with 1 and 5 wt% In2O3 loading) nanocomposite films have been prepared by a solvent-casting technique. The In2O3 nanoparticles used in this work were prepared by nonhydrolytic alcoholysis ester elimination reaction of indium acetate in the presence of oleic acid and oleyl alcohol at 220 °C. X-Ray diffraction (XRD) patterns and transmission electron microscopy (TEM) studies indicate that the In2O3 nanocrystals obtained in this work are nearly monodisperse, highly crystalline with cubic bixbyite structure without the presence of any other impurity phase. The PVA–In2O3 nanocomposite films have been structurally characterized by XRD, Fourier transform infrared (FTIR) and Raman spectroscopy. The results confirm the incorporation of In2O3 nanocrystals in the PVA matrix and interactions between In2O3 nanocrystals and PVA molecules. The thermal properties of nanocomposite films have been investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The thermo-oxidative degradation temperature of PVA increases with the addition of In2O3 nanocrystals and the degree of crystallinity of the PVA matrix decreases in the presence of In2O3 nanocrystals in the nanocomposite films. The room temperature sensing characteristics of the naocomposite films have been studied for various gases, namely, H2S, NH3, CH3, CO, and NO. The PVA–In2O3 nanocomposite films show maximum sensitivity for H2S gas with fast response and reversibility. The response mechanism of the nanocomposite films to various gases is also proposed.
69 citations
TL;DR: In this paper, high active catalysts consisting of amorphous copper core (the size is ≈ 3.5mm) covered by the thin 2 O oxide shell were prepared by a new method of laser electrodispersion.
Abstract: Highly active catalysts consisting of copper nanoparticles deposited on surface-oxidized silicon were prepared by a new method of laser electrodispersion. This method allows fabricating the stable monodispersive nanoparticles comprised of amorphous copper core (the size is ≈3.5 nm) covered by the thin ( 2 O oxide shell. Taking chlorohydrocarbon conversions (dichlorobutene isomerization, carbon tetrachloride addition to 1-octene and carbon tetrachloride reaction with decane) as examples the unusually high activity (10 4 –10 5 product mol/(metal mol h)) of closely packed ensembles of nanoparticles was observed. These catalysts are several orders of magnitude superior in activity than usual supported metal catalysts. In all the reactions studied, strong dependence of the catalytic activity on the particle surface density and on the polarity of the reactant solution was found. These results are in a good agreement with theoretical estimations indicating that nanoparticle charging, which occurs due to thermally activated electron tunneling between closely located particles is responsible for the formation of highly active catalytic system.
69 citations