Influence of the Number of Nanoparticles on the Enhancement Properties of Surface-Enhanced Raman Scattering Active Area: Sensitivity versus Repeatability

Influence of the Number of Nanoparticles on the Enhancement Properties of Surface-Enhanced Raman Scattering Active Area: Sensitivity versus Repeatability: "

ACS Nano

DOI: 10.1021/nn103256t

"

Cuprous Oxide Nanoshells with Geometrically Tunable Optical Properties

Cuprous Oxide Nanoshells with Geometrically Tunable Optical Properties: "

ACS Nano

DOI: 10.1021/nn200386n

"

Evidence for Multiple Trapping Mechanisms in Single CdSe/ZnS Quantum Dots from Fluorescence Intermittency Measurements over a Wide Range of Excitation Intensities

Evidence for Multiple Trapping Mechanisms in Single CdSe/ZnS Quantum Dots from Fluorescence Intermittency Measurements over a Wide Range of Excitation Intensities: "

The Journal of Physical Chemistry C

DOI: 10.1021/jp2001223

"

Hybrid, Silica-Coated, Janus-Like Plasmonic-Magnetic Nanoparticles

Hybrid, Silica-Coated, Janus-Like Plasmonic-Magnetic Nanoparticles: "

Chemistry of Materials

DOI: 10.1021/cm200399t

"

Investigating the Phosphine Chemistry of Se Precursors for the Synthesis of PbSe Nanorods

Investigating the Phosphine Chemistry of Se Precursors for the Synthesis of PbSe Nanorods: "

Chemistry of Materials

DOI: 10.1021/cm1033172

"

Synthesis of Cadmium Arsenide Quantum Dots Luminescent in the Infrared

Synthesis of Cadmium Arsenide Quantum Dots Luminescent in the Infrared: "

Journal of the American Chemical Society

DOI: 10.1021/ja1101932

"

α-SrNCN:Eu2+ − A Novel Efficient Orange-Emitting Phosphor

α-SrNCN:Eu2+ − A Novel Efficient Orange-Emitting Phosphor: "

Chemistry of Materials

DOI: 10.1021/cm102262u

"

Laser Ablation of Silver in Aqueous Solutions of Organic Species: Probing Ag Nanoparticle−Adsorbate Systems Evolution by Surface-Enhanced Raman and Surface Plasmon Extinction Spectra

rLaser Ablation of Silver in Aqueous Solutions of Organic Species: Probing Ag Nanoparticle−Adsorbate Systems Evolution by Surface-Enhanced Raman and Surface Plasmon Extinction Spectra: "

The Journal of Physical Chemistry C

DOI: 10.1021/jp110907d

"

Elucidation of Electrostatic Interaction between Cationic Dyes and Ag Nanoparticles Generating Enormous SERS Enhancement in Aqueous Solution

Elucidation of Electrostatic Interaction between Cationic Dyes and Ag Nanoparticles Generating Enormous SERS Enhancement in Aqueous Solution: "

The Journal of Physical Chemistry C

DOI: 10.1021/jp110146y

"

High-Quality Manganese-Doped Zinc Sulfide Quantum Rods with Tunable Dual-Color and Multiphoton Emissions

High-Quality Manganese-Doped Zinc Sulfide Quantum Rods with Tunable Dual-Color and Multiphoton Emissions: "

Journal of the American Chemical Society

DOI: 10.1021/ja110996c

"

Preparation, Characterization, and Photoluminescence Properties of Tb3+-, Ce3+-, and Ce3+/Tb3+-Activated RE2Si4N6C (RE = Lu, Y, and Gd) Phosphors

Preparation, Characterization, and Photoluminescence Properties of Tb3+-, Ce3+-, and Ce3+/Tb3+-Activated RE2Si4N6C (RE = Lu, Y, and Gd) Phosphors: "

Chemistry of Materials

DOI: 10.1021/cm103495j

"

Bifunctional Au−Fe3O4 Heterostructures for Magnetically Recyclable Catalysis of Nitrophenol Reduction

Bifunctional Au−Fe3O4 Heterostructures for Magnetically Recyclable Catalysis of Nitrophenol Reduction: "

The Journal of Physical Chemistry C

DOI: 10.1021/jp110956k

"

Wavelength-Selective Caged Surfaces: How Many Functional Levels Are Possible?

Wavelength-Selective Caged Surfaces: How Many Functional Levels Are Possible?: "

Journal of the American Chemical Society

DOI: 10.1021/ja110572j

"

"Firecracker-shaped" ZnO/polyimide hybrid nanofibers via electrospinning and hydrothermal process

"Firecracker-shaped" ZnO/polyimide hybrid nanofibers via electrospinning and hydrothermal process: "


Zhenjun Chang

(Communication from Chem. Commun.)

Zhenjun Chang, Chem. Commun., 2011, DOI: 10.1039/c0cc05634k

To cite this article before page numbers are assigned, use the DOI form of citation above.


The content of this RSS Feed (c) The Royal Society of Chemistry"

A Versatile Method for the Reductive, One-Pot Synthesis of Bare, Hydrophilic and Hydrophobic Magnetite Nanoparticles

A Versatile Method for the Reductive, One-Pot Synthesis of Bare, Hydrophilic and Hydrophobic Magnetite Nanoparticles: "

Abstract

A biocompatible, reliable, and particularly versatile synthesis of magnetic iron oxide nanoparticles (IONPs) is presented that uses iron(III) acetylacetonate Fe(acac)₃ as an iron precursor and sodium borohydride as a reducing agent. Both the reaction temperature and the concentration of the reducing agent have considerable effects on the IONP size. These dependencies can be used to prepare IONPs ranging in size from 5 to 8 nm, as determined by transmission electron microscopy (TEM). Synthesis at room temperature or with higher sodium borohydride concentrations always resulted in smaller particle sizes. Powder X-ray diffraction patterns show the presence of an iron oxide phase with a cubic unit cell and allow for the determination of the lattice parameters and average crystallite sizes for all synthesized IONPs. Transmission Mössbauer spectroscopy shows that the as-synthesized IONPs are pure magnetite (Fe₃O₄) and is further used to elucidate the reaction pathway by analyzing iron intermediates formed prior to nanoparticle formation and precipitation. TEM and high-resolution TEM reveal quasi-spherical shapes and lattice fringes for most IONPs. With only minor modifications of the synthesis procedure, this versatile, one-pot synthesis is proven to be suitable for the production of bare (uncoated) IONPs, IONPs with hydrophilic poly(ethylene glycol), L-arginine, and L-glutamic acid coatings, as well as IONPs with hydrophobic coatings such as oleic acid. All coated IONPs were characterized by FT-IR spectroscopy. In addition, the bare IONPs could easily be modified post-synthesis with a suitable capping agent using ultrasonication. To verify the biocompatibility of the IONPs, in vitro cytotoxicity studies were carried out on bare IONPs with intestinal (Caco2) and liver epithelial (HepG2) cell cultures using an 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Phase contrast microscopy after hematoxylin-eosin staining showed the intact morphology of the Caco2 and HepG2 cells treated with IONPs.

A versatile, reductive, one-pot synthesis for iron oxide nanoparticles provides a fast and up-scalable route to pure magnetite-phase (Fe₃O₄) nanoparticles. The particles can be bare, ready for post-synthesis modifications, or capped in situ with both hydrophilic and hydrophobic coatings under virtually identical conditions in just a few minutes. The reaction uses no toxic solvents or ligands, and the hydrophilic coatings such as L-arginine and L-glutamic acid provide easy access for bioconjugation.

"

Comparative study of core–shell iron/iron oxide gold covered magnetic nanoparticles obtained in different conditions

Comparative study of core–shell iron/iron oxide gold covered magnetic nanoparticles obtained in different conditions: "

Abstract

In this study, we report the synthesis and characterization of the core–shell Fe covered with Au shells nanoparticles with
mean diameters between 5 and 8 nm. The inverse micelles method was utilized to produce the samples. X-ray diffraction studies
show that both core–shell systems have the expected crystalline structure. High resolution transmission electron microscopy
and atomic emission spectroscopy techniques give additional information concerning the structure and composition of nanoparticles.
An intermediate shell of amorphous oxidized iron was found between the magnetic Fe core and the external gold shell. The magnetic
behavior of different core–shell samples shows no hysteresis loop indicating the superparamagnetic behavior of Fe@Au systems.
The superparamagnetic behavior is also evidenced from FC and ZFC dependences of the magnetization versus temperature. By using
the temperature dependence of the thermoremanent magnetization combined with magnetization versus applied magnetic field,
the effective anisotropy constant was determined. The Fe/Au interface contribution to the effective anisotropy constant was
calculated and discussed in relation with the combined shape and stress anisotropies.

• Content Type Journal Article
• Pages 1-12
• DOI 10.1007/s11051-011-0313-3
• Authors
  • C. Leostean, National Institute for R&D of Isotopic and Molecular Technologies, P. O. Box 700, 400293 Cluj-Napoca, Romania
  • O. Pana, National Institute for R&D of Isotopic and Molecular Technologies, P. O. Box 700, 400293 Cluj-Napoca, Romania
  • R. Turcu, National Institute for R&D of Isotopic and Molecular Technologies, P. O. Box 700, 400293 Cluj-Napoca, Romania
  • M. L. Soran, National Institute for R&D of Isotopic and Molecular Technologies, P. O. Box 700, 400293 Cluj-Napoca, Romania
  • S. Macavei, National Institute for R&D of Isotopic and Molecular Technologies, P. O. Box 700, 400293 Cluj-Napoca, Romania
  • O. Chauvet, Institute of Materials Jean Rouxel, 44322 Nantes cedex 3, France
  • C. Payen, Institute of Materials Jean Rouxel, 44322 Nantes cedex 3, France

• Journal Journal of Nanoparticle Research
• Online ISSN 1572-896X
• Print ISSN 1388-0764

"

Shape-Controlled Growth and Shape-Dependent Cation Site Occupancy of Monodisperse Fe3O4 Nanoparticles

Shape-Controlled Growth and Shape-Dependent Cation Site Occupancy of Monodisperse Fe3O4 Nanoparticles: "

Chemistry of Materials

DOI: 10.1021/cm102758u

"

High temperature magnetic properties of magnesium ferrite nanoparticles

High temperature magnetic properties of magnesium ferrite nanoparticles: "A. Franco, Jr. and M. S. Silva
Magnetic properties such as Curie temperature (T), saturation magnetization (M), remanent magnetization (M), and coercivity (H) of nanoparticles of magnesium ferrites (MgFeO) were studied in a broad range of temperatures varying from room temperature to 800 K. The magnetization decreases with increa ... [J. Appl. Phys. 109, 07B505 (2011)] published Fri Mar 18, 2011."

Aqueous pathways for the formation of zinc oxide nanoparticles

Aqueous pathways for the formation of zinc oxide nanoparticles: "


Amir Moezzi, Michael Cortie, Andrew McDonagh

(Paper from Dalton Trans.)

Amir Moezzi, Dalton Trans., 2011, DOI: 10.1039/c0dt01748e

To cite this article before page numbers are assigned, use the DOI form of citation above.


The content of this RSS Feed (c) The Royal Society of Chemistry"

Shape-tailoring of gold nanostructures: can a detergent act as the reducing or protecting agent?

Shape-tailoring of gold nanostructures: can a detergent act as the reducing or protecting agent?: "


The synthesis of differently shaped gold nanoparticles can be performed in an aqueous solution at ambient conditions by using a commercial detergent that was found to be an effective reducing as well as stabilizing agent. In addition, the as-prepared gold nanoparticles were found to be able to act as an efficient catalyst for the reduction reaction of 4-nitrophenol at room temperature.
Thathan Premkumar, Kyungjae Lee, Kurt E. Geckeler

( from Nanoscale)

Thathan Premkumar, Nanoscale, 2011, DOI: 10.1039/C0NR00853B

To cite this article before page numbers are assigned, use the DOI form of citation above.

The content of this RSS Feed (c) The Royal Society of Chemistry"

Highly enhanced photoluminescence of a rose-like hierarchical superstructure prepared by self-assembly of rare-earth hydroxocation nanosheets and polyoxomolybdate anions

Highly enhanced photoluminescence of a rose-like hierarchical superstructure prepared by self-assembly of rare-earth hydroxocation nanosheets and polyoxomolybdate anions: "


Byung-Il Lee, Song-Ho Byeon

(Communication from Chem. Commun.)

Byung-Il Lee, Chem. Commun., 2011, DOI: 10.1039/c1cc10130g

To cite this article before page numbers are assigned, use the DOI form of citation above.


The content of this RSS Feed (c) The Royal Society of Chemistry"

Application of Silver-Coated Magnetic Microspheres to a SERS-Based Optofluidic Sensor

Application of Silver-Coated Magnetic Microspheres to a SERS-Based Optofluidic Sensor: "

The Journal of Physical Chemistry C

DOI: 10.1021/jp112265e

"