We propose a method for the synthesis of colloidal ZnO solution with poly( N -vinylpyrrolidone) (PVP) as stabilizer. Stable solutions good luminescence properties are obtained by using PVP stabilizer in nanoparticles sol–gel assisted ultrasound. Nanoparticles sizes 30–40 nm matrix produced solid product. The ZnO/PVP/methanol solution, apart from most intense PL band at 356 coming PVP, exhibits strong 376 (3.30 eV) which corresponds to emission free exciton recombination nanoparticles.

Multiphonon resonant Raman scattering (RRS) was studied in unintentionally doped bulk $\mathrm{ZnO}$ crystals and layers, including nanostructured highly conductive films, excited by 351.1 $363.8\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ laser lines the temperature interval from 10 to $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The variation of conditions with sample wavelength excitation line allowed us discriminate between incoming outgoing exciton mediated RRS LO phonons. quenching...

Room temperature angle-dispersive x-ray diffraction measurements on spinel ZnGa2O4 up to 56 GPa show evidence of two structural phase transformations. At 31.2 GPa, undergoes a transition from the cubic structure tetragonal similar that ZnMn2O4. 55 second orthorhombic marokite (CaMn2O4-type) takes place. The equation state is determined: V0 = 580.1(9) A3, B0 233(8) B0'= 8.3(4), and B0''= -0.1145 GPa-1 (implied value); showing one less compressible spinels studied date. For an also 257.8(9)...

The interrelationships between the topological features, such as surface roughness deduced from atomic force microscopy (AFM), and wettability properties expressed by contact angle of a water droplet on nanostructured wide bandgap oxide films prepared spray pyrolysis are investigated for range compositions. A direct relationship value was found nanocomposite (In2O3)1−x(MgO)x, (In1−xGax)2O3, Zn1−xMgxO films, which both increase with increasing x-value. On other hand, in ITO doped Ga, it that...

Abstract In this work we present a first‐principles density functional study of the vibrational properties ZnAl 2 O 4 and ZnGa as function hydrostatic pressure. Based on our previous structural characterization these two compounds under pressure, herewith, report pressure dependence both systems modes for cubic spinel structure, CaFe ‐type structure ( Pnma ) in marokite Pbcm . Additionally second order phase transition from towards CaTi Cmcm ), which also calculate at Γ point. Our...

It is shown that, along with the advantages, sensors based on porous silicon (PSi) have disadvantages that inhibit their widespread use. The parameters of PSi which can affect performance PSi‐based are considered in detail, and approaches analyzed allow for improvement main characteristics gas vapor sensors. concluded despite progress made terms improving sensitivity, selectivity, stability sensors, further research development this direction necessary, as existing methods do not provide...

It is shown that ZnO nanorods and nanodots grown by MOCVD exhibit enhanced radiation hardness against high energy heavy ion irradiation as compared to bulk layers. The decrease of the luminescence intensity induced 130 MeV Xe(23+) at a dose 1.5 × 10(14) cm(-2) in nearly identical 6 10(12) damage introduced change nature electronic transitions responsible for luminescence. excitonic related tailing density states caused potential fluctuations occurs an around 1 5 layers, respectively. More...

Aeromaterials represent a class of increasingly attractive materials for various applications. Among them, aero-ZnS has been produced by hydride vapor phase epitaxy on sacrificial ZnO templates consisting networks microtetrapods and proposed microfluidic In this paper, cost-effective technological approach is the fabrication using physical transport with Sn 2 S 3 crystals as precursors. The morphology material investigated scanning electron microscopy (SEM), while its crystalline optical...

Abstract Spinel‐type ZnGa 2 O 4 and ZnAl powders doped with Eu 3+ Tb ions, including dual doping, have been prepared by solid phase reactions deposition from chemical solutions. XRD analysis demonstrates the high quality of spinel grains constituting powder. The luminescence shows that rare earth ions are incorporated in defect regions at grain boundaries. emission spectra samples europium characterized an intense red region due to 5 D 0 → 7 F 1,2 transitions whereas case terbium highest...

Photoluminescence (PL) and resonant Raman scattering (RRS) excited by the 351.1nm line of an Ar+ laser were studied in highly conductive ZnO layers deposited thermal decomposition Zn(C5H7O2)2 metalorganic compound on porous InP substrates. The emission spectra consist multiphonon RRS lines superimposed a broad asymmetric PL band with maximum at 3.36eV. occurrence is attributed to tailing density states caused potential fluctuations due randomly distributed intrinsic defects.

Abstract It is shown that ZnO nanorods grown by MOCVD exhibit enhanced radiation hardness against high energy heavy ion irradiation as compared to bulk layers. The decrease of the luminescence intensity induced 130 MeV Xe +23 at a dose 1.5 × 10 14 cm –2 in nearly identical 6 12 change nature electronic transitions responsible for occurs an around 1 and 5 layers, respectively. High followed thermal annealing also effective on quality electrodeposition. (© 2008 WILEY‐VCH Verlag GmbH & Co....

Absorption (K), reflection (R) and wavelength modulated transmission (ΔT/Δλ) spectra in SnS2 crystals of hexagonal phase (space group P63/mmc) were investigated temperature interval from 300 to 10 K. It was established that indirect band gap ( - 2.403 eV) is due unpolarized transitions between Γ M points Brillouin zone. A minimal direct 2.623 E∣∣b polarization formed by allowed E⊥b (2.698 forbidden point magnitude refractive index (n) changes 3 4 has a maximum at 2.6 eV. Optical functions...

A series of Zn1-xMgxO thin films with x ranging from 0 to 0.8 were prepared by spin coating and aerosol spray pyrolysis deposition on Si quartz substrates. The morphology, composition, nano-crystalline structure, optical vibration properties the studied using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), diffraction (XRD), Raman scattering spectroscopy. optimum conditions thermal treatment samples determined point view film crystallinity. content crystalline...

A new ZnO micro/nanostructure morphology in the form of micro-torches was grown family hierarchical structures by a simplified thermal chemical vapour transport and condensation method using vertical furnace. It is formed two basic parts: three-dimensional (3D) crystal base one-dimensional (1D) nanorods nucleated from this base. Mechanisms growth are suggested to be governed change supersaturation level during growth. Micro-Raman analysis demonstrates good lattice quality, independent...

Nanophosphor of ZnGa2O4:Eu3+ and Er3+ were synthesized by the hydrothermal method. ZnGa2O4 is an intrinsic blue light emitter with a wavelength peak approximately 608 nm depending on gallium ratio. A luminescent analysis materials shows that rare earth ions are localized in defect sites at crystallite boundaries. The emission spectra europium-doped samples characterized intense red region due to 5D0–7F1, 2 transitions Eu3+ ions, whereas case erbium doping highest intensity corresponds green...

Hexagonal and arrow-headed ZnO nanorod structures have been grown by low pressure chemical vapour deposition (CVD) atmospheric metal-organic CVD. The technology ensures a high optical quality of the produced nanostructures to act as gain medium for stimulated emission in ultraviolet spectral region combination with factor laser resonators. Multiple sharp lasing peaks related guided modes were realized from single hexagonal nanorods arrays nanorods. A comparative analysis variations spectra...