We show the anisotropic selective growth of gold tips onto semiconductor (cadmium selenide) nanorods and tetrapods by a simple reaction. The size can be controlled concentration starting materials. new nanostructures display modified optical properties caused strong coupling between parts. increased conductivity as well chemical affinity for forming self-assembled chains rods. Such gold-tipped provide natural contact points self-assembly electrical devices solve difficult problem contacting...

The H2O2-mediated enlargement of Au nanoparticles (NPs) and the growth mechanism are described. In addition to deposition gold on NP faces, formation nanocrystalline clusters at intersection faces is observed. detachment latter nanoclusters provides additional seeds for gold. biocatalyzed generation H2O2 in presence O2/glucose glucose oxidase enabled development an optical biosensor glucose.

We explore the growth mechanism of gold nanocrystals onto preformed cadmium sulfide nanorods to form hybrid metal nanocrystal/semiconductor nanorod colloids. By manipulating conditions, it is possible obtain nanostructures exhibiting Au nanocrystal at only one tip, both tips, or multiple locations along surface. Under anaerobic occurs tip nanorods, producing asymmetric structures. In contrast, presence oxygen and trace amounts water during reaction promotes etching surface, providing...

Gold growth on CdS nanorods and seeded CdSe/CdS with without illumination at different temperatures was studied. Two competing mechanisms were identified: thermal light-induced growth. The mechanism leads to of small gold particles defects along the rod body can be suppressed lower temperatures. This control is attributed a phase transition alkyl chains surface amine ligands static temperatures, blocking Au precursor's access nanorod surfaces. While long-chain (C18) shows effective 293 K,...

In this study, a facile and effective method to modify the photocatalytic performance of bismuth oxybromide (BiOBr) semiconductor through fabrication heterojunction with hydrated oxide (BHO) is reported. The new yBiOBr-(1 – y)BHO heterojunction, synthesized by simple hydrothermal method, exhibits high activity under visible light irradiation for photodegradation typical organic pollutants in water, such as Rhodamine B (RhB) acetophenone (AP). Both individual BiOBr BHO components show very...

Coupling of atoms is the basis chemistry, yielding beauty and richness molecules. We utilize semiconductor nanocrystals as artificial to form nanocrystal molecules that are structurally electronically coupled. CdSe/CdS core/shell linked dimers which then fused via constrained oriented attachment. The possible facets in such fusion takes place analyzed with atomic resolution revealing distribution crystal scenarios. Coherent coupling wavefunction hybridization manifested by a red shift band...

Semiconductor heterostructure nanocrystals, especially with core/shell architectures, are important for numerous applications. Here we show that by decreasing the shell growth rate morphology of ZnS shells on ZnSe quantum rods can be tuned from flat to islands-like, which decreases interfacial strain energy. Further reduced speed, approaching thermodynamic limit, leads coherent forming unique helical-shell morphology. This reveals a template-free mechanism induced chirality at nanoscale. The...

A complex InAs/CdSe/ZnSe Core/Shell1/Shell2 (CSS) structure is synthesized, where the intermediate CdSe buffer layer decreases strain between InAs core and ZnSe outer shell. This leads to significantly improved fluorescence quantum yield as compared previously prepared core/shell structures enables growth of much thicker shells. The shell done using a layer-by-layer method in which cation anion precursors are added sequentially allowing for excellent control good size distribution maintained...

CdS nanorods with ZnSe seeds are developed. Rod growth is achieved for a seed zinc blende structure. Due to the type-I potential profile in this anisotropic nanoheterostructure, charge-carrier separation occurs excited state of nanorod. Structural characterization shown as well static and time-resolved optical spectroscopy. A fluorescence quantum yield 45% achieved, demonstrating exceptional properties these structures.

Gold growth onto CdSe seeded CdS nanorods is studied. Preferential of gold the position seed identified. The mechanism assigned to an electrochemical Ostwald ripening process.

Pouring in: The picture shows an STEM image of 7-nm Au-InAs metal–semiconductor hybrid nanoparticles where a gold core (yellow) is surrounded by amorphous InAs shell (pink). These form diffusion Au into particles.

Summary The growing demand of gold nanoparticles in medical applications increases the need for simple and efficient characterization methods interaction between biological systems. Due to its nanometre resolution, modern scanning electron microscopy (SEM) offers straightforward visualization metallic down a few size, almost without any special preparation step. However, materials SEM requires complicated procedure, which is typically finished by metal coating needed decrease charging...

Enantioselective surfactant-templated thin films were fabricated through the sol-gel (SG) process. The enantioselectivity is general in sense that it discriminates between pairs of enantiomers not used for imprinting chiral cationic surfactant (-)-N-dodecyl-N-methylephedrinium bromide (1) was as template, and after its extraction domains created. discriminative feature these examined by challenging with pure enantiomer solutions rebinding. Selective adsorption shown using (R)-...

One of the drawbacks nanozyme catalytic functions rests in their moderate activities due to lack effective binding sites concentrating reaction substrate at interface. Methods concentrate substrates interface are essential improving functions. The present study addresses this goal by designing uric acid (UA) molecular-imprinted polyaniline (PAn)-coated Cu-zeolitic imidazolate framework (Cu-ZIF) nanoparticles as superior nanozymes, "polynanozymes", catalyzing H2O2 oxidation UA allantoin...

Telomers are single-stranded DNA consisting of constant repeat units that generated by the ribonucleoprotein telomerase present in cancer cells (e.g., HeLa cells). Two methods for using telomer templates preparation Au nanowires presented. By one method, telomerization is performed presence aminoallyl-functionalized dUTP. The covalent tethering an active ester-modified nanoparticle (1.4 nm) to amine followed catalytic enlargement particles yields nanowires. second method involves...