Si nanocrystals embedded in SiO2 doped with P and Au at concentrations in the range of 1 10–3 10 cm 3 exhibit photoluminescence quenching. Upon increasing the Au concentration, a gradual decrease in nanocrystal photoluminescence intensity is observed. Using a statistical model for luminescence quenching, we derive a typical radius of 3 nm for nanocrystals luminescing around 800 nm. Au doping al...

A nanocrystal memory using CoSi2/Si hetero-nanocrystals as floating gate was proposed. Numerical investigations on the writing, erasing and retention were performed. The hetero-structure provides an extra quantum well for the charge to achieve much longer retention time while maintains a writing/erasing speed similar to that of Si nanocrystal memory. 2005 Elsevier Ltd. All rights reserved. PACS...

The mechanical stability of nanocrystal films is critical for applications, yet largely unexplored. Raman microprobe analysis used here to probe the nanocrystal cores of thick, fractured electrophoretically deposited films of 3.2 nm diameter CdSe nanocrystals measures approximately 2.5% in-plane tensile strain in cores of unfractured films. The crack dimensions determine the overall in-plane fi...

To improve signal stability and quantitation, an optically stable, novel class of fluorophore for hybridization analysis of human metaphase chromosomes is demonstrated. Detection of hybridization sites in situ was based on fluorescence from streptavidin-linked inorganic crystals of cadmium selenide [(CdSe)ZnS]. Fluorescence of nanocrystal fluorophores was significantly brighter and more photost...

Chitin Nanocrystal Structure In article number 2200320, Yurtsever, Fukuma, and co-workers provided the molecular-scale structural details of chitin nanocrystals in water by combining 3D atomic force microscopy experiments molecular dynamics simulations. The characterization nanocrystal surfaces at scale could pave way for assessing chemical enzymatic activities on nanocrystals, offering an unde...

Structural characterization via transmission electron microscopy and atomic force microscopy of arrays of small Si nanocrystals embedded in SiO2, important to many device applications, is usually difficult and fails to correctly resolve nanocrystal size and density. We demonstrate that scanning tunneling microscopy sSTMd imaging enables a much more accurate measurement of the ensemble size dist...

A semiconductor nanocrystal film is a unique class of nanocomposite, whose collective properties are determined by those of its constituents. Colloidal synthetic methods offer precise size control and finely tuned optical properties via quantum confinement, while recent improvements in charge transport through films have led to a variety of optoelectronic applications. However, understanding th...

Colloidal semiconductor nanocrystals have attracted attention for cost-effective, solution-based deposition of quantum-confined thin films for optoelectronics. However, two significant challenges must be addressed before practical nanocrystal-based devices can be realized. The first is coping with the ligands that terminate the nanocrystal surfaces. Though ligands provide the colloidal stabilit...

Self-assembled cobalt (Co) nanocrystals on ultra-thin silicon dioxide layer were fabricated by in situ annealing Co ultrathin films deposited with Co effusion cell in a molecular-beam-epitaxy chamber. The resultant nanocrystals obtained at the optimized annealing temperature are around 3–4 nm in diameter with dot density of about 1 · 10 cm . The metal–oxide–semiconductor capacitors containing C...

The structure evolution of CdSe nanocrystal with different grown sizes (1.9, 2.7 and 3.1 nm, respectively) obtained by size-selective method from colloidal solution is investigated by XAFS. By such purposeful design of samples, we have investigated the isolated ripening process effect on the structure of nanocrystals. The Se K-edge XAFS results of CdSe nanocrystals show that structure disorder ...