Sonochemically synthesized mesoporous cobalt oxide nanoparticles for luminol-enhanced chemiluminescence sensing.

In recent years, mesoporous cobalt oxides have attracted more attention due to their exceptional physical and chemical properties and their important applications in various fields. The synthesis of cobalt oxides of various sizes, morphologies, and porosity is still a challenging process. In this report, mesoporous CoONPs with different porosity were synthesized through facile, one-step, and cost-effective routes, without using any complicated materials or instruments, via the sonochemical process.

Nanoporous TiO2 nanoparticle assemblies with mesoscale morphologies: nano-cabbage versus sea-anemone.

We report the novel synthesis of nanoporous TiO2 nanoparticle ensembles with unique mesoscale morphologies. Constituent nanoparticles evolved into multifaceted assemblies, exhibiting excellent crystallinity and enhanced photocatalytic activity compared with commercial TiO2. Such materials could be exploited for applications, like organic pollutant degradation.

Bright luminescent, colloidal stable silica coated CdSe/ZnS nanocomposite by an in situ, one-pot surface functionalization.

In this article, a systematic study of the design and development of surface-modification schemes for silica coated nanocomposite via an in situ, one-pot way is presented. Silica coated CdSe/ZnS nanoparticles were prepared in a water-in-oil microemulsion and subsequently surface modified via addition of various organosilane reagents to the microemulsion system. The resulting functionalized composite nanoparticles were characterized by different techniques like Transmission Electron Microscopy (TEM), photoluminescence spectroscopy and zeta-potential measurements.

A facile synthesis method to silica coated CdSe/ZnS nanocomposites with tuneable size and optical properties.

A facile method for the preparation of single Quantum Dots (QDs) in silica spheres with tunable size and optical property has been developed. A time interval addition of silica precursor method has been used to increase the size of the silica shell and in parallel tuning the photoluminescence property. The resulting CdSe/ZnS/SiO(2) nanocomposites were characterized by transmission electron microscopy, photoluminescence spectroscopy and zeta-potential measurements.

A four-color colloidal multiplexing nanoparticle system.

Any labeling with multicolor markers can be affected by the autofluorescence of biological tissue due to the UV or blue light excitation sources, or the results are affected by fluorescence resonance energy transfer. In this work, we present novel IR-to-vis upconverting nanoparticles of different rare earth metal dopants. With a single excitation source of 980 nm, four different colors of nanocrystals can be spectrally separated under multiplexing conditions.

Au-silica nanoparticles by "reverse" synthesis of cores in hollow silica shells.

Core-silica shell nanoparticles were prepared in a "reverse" manner by nucleation and growth of Au cores within hollow silica nanospheres.

Silica coated, water dispersible and photoluminescent Y (V,P)O(4):Eu(3+),Bi(3+) nanophosphors.

We propose an approach for silica encapsulation of YV((0.7))P((0.3))O(4):Eu(3+), Bi(3+) nanophosphors through a microemulsion process.

Silica encapsulation of hydrophobically ligated PbSe nanocrystals.

Spherical PbSe@SiO2 nanoparticles have been successfully synthesized within reverse micelles via metal alkoxide hydrolysis and condensation within a microemulsion system. These core-shell nanoparticles were characterized by transmission electron microscopy (TEM), NIR absorption spectroscopy, energy-dispersive X-ray analysis, and TEM electron diffractions. It shows that the obtained core-shell structures have a spherical shape with narrow size distribution (average size approximately 35 nm) and smooth surfaces.

One-pot synthesis of YF3@silica core/shell nanoparticles.

A new one-pot synthetic method for preparing core/shell YF3@SiO2 nanoparticles with different morphologies, from spherical to elongated structures ("pearl necklace"), is described; absorbance and photoluminescence spectroscopy reveals intrinsic but no extrinsic defects in the YF3.