Whispering gallery modes in photoluminescence and Raman spectra of a spherical microcavity with CdTe quantum dots: anti-Stokes emission and interference effects

We have studied the photoluminescence and Raman spectra of a system consisting of a polystyrene latex microsphere coated by CdTe colloidal quantum dots. The cavity-induced enhancement of the Raman scattering allows the observation of Raman spectra from only a monolayer of CdTe quantum dots. Periodic structure with very narrow peaks in the photoluminescence spectra of a single microsphere was detected both in the Stokes and anti-Stokes spectral regions, arising from the coupling between the emission of quantum dots and spherical cavity modes

Guided self-assembly of Fe3O4 nanoparticle on chemically active surface templates generated by electro-oxidative nanolithography

An approach for the site-selective binding of magnetic Fe3O4 particles onto predefined surface templates is reported. Chem. active surface patterns are prepd. by electro-oxidative nanolithog. performed with the conductive tip of a scanning probe microscope on n-octadecyltrichlorosilane (OTS) monolayers self-assembled on silicon. The chem. functionalization allows prefabricated nanoparticles with an org. ligand shell to attach selectively on these surface sites, just by immersing the sample into the particle soln. Besides the use of the active surface patterns to guide the assembly of Fe3O4 nanoparticles with nanometer precision, several aspects of the patterning process are briefly discussed in terms of optimization of the obtainable line width. [on SciFinder (R)

Guided self-assembly of Fe3O4 nanoparticle on chemically active surface templates generated by electro-oxidative nanolithography

An approach for the site-selective binding of magnetic Fe3O4 particles onto predefined surface templates is reported. Chem. active surface patterns are prepd. by electro-oxidative nanolithog. performed with the conductive tip of a scanning probe microscope on n-octadecyltrichlorosilane (OTS) monolayers self-assembled on silicon. The chem. functionalization allows prefabricated nanoparticles with an org. ligand shell to attach selectively on these surface sites, just by immersing the sample into the particle soln. Besides the use of the active surface patterns to guide the assembly of Fe3O4 nanoparticles with nanometer precision, several aspects of the patterning process are briefly discussed in terms of optimization of the obtainable line width. [on SciFinder (R)

Large improvement of electron extraction from CdSe quantum dots into s TiO2 thin layer by N3 dye coabsorption

Large increase of electron extraction from CdSe quantum dots into TiO2 by N3 dye coadsorption , Thin Solid Films 516 2008 6994 699

Inkjet printing of luminescent CdTe nanocrystal-polymer composites

Inkjet printing is used to produce well-defined patterns of dots (with diams. of ca. 120 mm) that are composed of luminescent CdTe nanocrystals (NCs) embedded within a poly(vinylalc.) (PVA) matrix. Addn. of ethylene glycol (1-2 vol%) to the aq. soln. of CdTe NCs suppresses the well-known ring-formation effect in inkjet printing leading to exceptionally uniform dots. At. force microscopy characterization reveals that in the CdTe NC films the particle-particle interaction could be prevented using inert PVA as a matrix. Combinatorial libraries of CdTe NC-PVA composites with variable NC sizes and polymer/NC ratios are prepd. using inkjet printing. These libraries are subsequently characterized using a UV/fluorescence plate reader to det. their luminescent properties. Energy transfer from green-light-emitting to red-light-emitting CdTe NCs in the composite contg. green- (2.6 nm diam.) and red-emitting (3.5 nm diam.) NCs are demonstrated