We demonstrate the surface defect-related luminescence properties of SnO2 nanorods and nanoparticles using steady-state time-resolved spectroscopy. Defect-related bands are identified by Raman EPR On basis experimental results, we propose a schematic model for different relaxation processes in nanocrystals upon photoexcitation. Analysis suggests that visible emission is due to transition an electron from level close conduction band edge deeply trapped hole bulk (V0••) nanocrystals....

This feature article highlights the new development and current status of rare-earth (RE) based core-shell nanocrystals, which is one classes hybrid nanostructures. Attractive properties nanomaterials include extremely narrow emission bands, long lifetimes, large Stoke's shifts, photostability absence blinking that can be exploited for biophotonic photonic applications. Core-shell nanostructures have been attracting a great deal interest to improve luminescence efficiency by elimination...

Tin dioxide (SnO₂) is a material of ever increasing scientific attention as result its many constructive and varied physical properties: different morphological structures SnO2 nanocrystals modulate the performance diverse applications.

Here, we report the preparation of pure and Eu3+-doped SnO2 nanocrystals by microwave synthesis. The size dependence band gap energies quantum-confined particles agrees very well with confinement regime. PL intensity, decay time, quantum efficiency are found to be sensitive particle size. calculated efficiencies 22.0%, 31.0%, 26.0% for 300, 400, 800 °C heated samples, respectively, because minimum nonradiative rate is observed at 400 sample. Analysis suggests that crystallite plays an...

Here, we report the preparation of Ce3+ and Tb3+ co-doped sodium yttrium fluoride nanorods NaYF4:Ce3+/Tb3+ core-shell nanoparticles by emulsion method. The are confirmed X-ray diffraction study transmission electron microscopy (TEM) analysis. hexagonal crystal phase Ce3+-doped nanocrystals is converted to cubic polymorph after surface coating TbF3. Cell volume, cell parameters lattice strain have been modified due structure. decay times found be 8.4 ms 5.4 for doped nanoparticles,...

Tuning the functional properties of nanocrystals is an important issue in nanoscience. Here, we are able to tune photocatalytic SnO2 by controlling their size and shape. A structural analysis was carried out using X-ray diffraction (XRD)/Rietveld transmission electron microscopy (TEM). The results reveal that number oxygen-related defects varies upon changing shape nanocrystals, which eventually influences properties. Time-resolved spectroscopic studies carrier relaxation dynamics further...

Core–shell structures of SnO₂nanocrystals improve the performance diverse applications.

Recent studies have shown that SnO2-based nanocomposites offer excellent electrical, optical, and electrochemical properties. In this article, we present the facile cost-effective fabrication, characterization testing of a new SnO2-PbS nanocomposite photocatalyst designed to overcome low photocatalytic efficiency brought about by electron-hole recombination narrow photoresponse range. The structure is fully elucidated X-ray diffraction (XRD)/Reitveld refinement, Raman spectroscopy,...

We report the preparation of CdS/LaPO4:Eu nanorods via a three-step chemical route involving solvothermal CdS nanorods. Then, surface functionalisation by citric acid is done. Finally, formation LaPO4 shell achieved. The core/shell nanostructure confirmed X-ray diffraction studies and transmission electron microscopy (TEM) analysis. crystal phase (shell) changes with changing temperature heating. It interesting to note that lattice strain (core) increases from 0.27% 1.09% for pure core...

Here we report the photocatalytic properties of semiconductor SnO2/CdS heterostructure nanocrystals. A type-II has been synthesized from a single-source precursor and its structure was determined using XRD, HRTEM, elemental mapping line scan EDAX analysis. time resolved spectroscopic study revealed effective charge separation in this mechanism proposed schematic model. It is important to mention that conductivity found be lower compared uncoated SnO2 nanorods due efficient separation. The...

The detailed understanding of the crystal structure and microstructure nanomaterials is useful to predict properties nanomaterials. SnO2 nanocrystals different shapes like particles, spheres, rods pyramids are chemically synthesized. Here, we report morphologies using X-ray diffraction high-resolution transmission electron microscopy (HRTEM). It interesting note that tetragonal phase found in particle, sphere rod shaped pyramid composed two types orthorhombic phases. Rietveld method has been...

The fundamental understanding of lanthanide-doped upconverted nanocrystals remains a frontier area research because potential applications in photonics and biophotonics. Recent studies have revealed that upconversion luminescence dynamics depend on host crystal structure, size the nanocrystals, dopant concentration, core-shell structures, which influence site symmetry distribution energy migration ions. In this review, we bring to light influences doping/co-doping phase, host, structure...

High yield syntheses of size-confined Bi2Te3 and Sb2Te3 nanocrystals nanoflakes, their alloys, were carried out by a facile glycol-mediated solvothermal process. Phase purity good crystalline quality achieved for all alloy compositions this synthesis The isotropically anisotropically shaped obtained without using any capping molecule, template, or ligand. Plausible growth mechanisms have been proposed. Densification via spark plasma sintering allowed dense bulk polycrystalline specimens with...

Here, we have fabricated of LaPO4:Eu3+ doped and LaPO4/Eu2O3 core-shell nanocrystals using solution based methods. The morphologies, structure, formation mechanism, photoluminescence properties these are investigated in detail. compressive tensile lattice strains obtained for hexagonal monoclinic LaPO4 nanocrystals, respectively. Photoluminescence found to be sensitive the crystal phase, morphology, structures. Judd–Ofelt parameters (Ω2) calculated understand asymmetric nature dopant Eu3+...

A solution based hydrothermal method is used for the preparation of LaPO4:Yb–Tm doped and LaPO4:Yb/Tm core-shell upconverted nanorods. The morphologies, structure, formation mechanism, upconversion emission properties these nanocrystals are investigated in detail. Tensile strain observed material but compressive obtained material. Analysis suggests that lattice plays an important role on emission. Bright blue (475 nm) red (650 emissions associated to G14→H36 F32→H36 transitions were a...

Here, we demonstrate the synthesis of Sm 2 O 3 nanoparticles, nanorods and nanoplates by solution-based techniques. The mechanism related to morphology control is proposed discussed. crystal phase nanocrystal tuned varying surfactant in reaction. It found that compressive strain observed for lower temperature (600 °C) heated sample but reversal appears at elevated (900 °C). A chromatic change photoluminescence (PL) emission with tuning excitation wavelength has been observed. PL due f–f...

A simple method has been described for the generation of white light from cationic ionic liquid (IL) compounds 1-n-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) stabilized ZnO nanocrystals (NCs). Upon mixing IL with NCs, absorption band is red shifted 245 nm to 285 which attributed charge-transfer due donor–acceptor systems. The blue emission at 420 pure originated π–π* transition in imidazolium moiety and strong yellow 557 defect NCs. In case NCs IL, combination gives intense...

One design strategy by which to iterate the photocatalytic efficiency of semiconducting nanomaterials for harvesting solar energy involves synthesis type-II heterostructured materials. In this article, a straightforward, facile and environmentally benign route heterostructures in SnO2 nanospheres are capped PbS nanocubes is reported. It offers address current limitations brought about electron-hole recombination narrow photoresponsive ranges many existing systems. grown presence preformed...

Fabrication of size-controlled (5–10 nm) Fe₃O₄/C NCs<italic>via</italic>a simple hydrothermal reduction route using single iron precursor (FeCl₃·6H₂O) obtained from accumulated ore tailings with excellent magnetic, optical and photocatalytic properties.

The formation and decomposition of a layered structure ammonium fluorolanthate during the preparation Ce3+-doped sodium yttrium fluoride nanomaterials are investigated by XRD, TGA, TEM, FTIR, photoluminescence spectroscopy. influences sonication temperature heating on structural changes, that is, lattice strain parameters due to structure, have been demonstrated. change morphology from nanorods nanoparticles after is confirmed TEM study. It FTIR study interlayer water molecules "icelike...