0000000000303665

AUTHOR

Grzegorz Nowaczyk

showing 5 related works from this author

Enhancement of Electronic and Optical Properties of ZnO/Al2O3 Nanolaminate Coated Electrospun Nanofibers

2016

International audience; Nanolaminates are new class of promising nanomaterials with outstanding properties. Here we explored on the tuning of structural properties and the enhancement of electronic and optical properties of 1D PAN ZnO/Al2O3 nanolaminates designed by atomic layer deposition (ALD) and electrospinning. The influence of ZnO/Al2O3 bilayer thicknesses on the fundamental properties of 1D PAN ZnO/Al2O3 nanolaminates has been investigated. Due to the quantum confinement effect, the shift of XPS peaks to higher energies has been observed. Work function of Al2O3 was mostly independent of the bilayers number, whereas the ZnO work function decreased with an increase of the bilayer numbe…

PhotoluminescenceMaterials scienceNanotechnology02 engineering and technology010402 general chemistry7. Clean energy01 natural sciencesWork functionNanomaterialsAtomic layer depositionNanolaminatesWork functionPhysical and Theoretical ChemistryelectrospinningPotential wellbusiness.industryBilayer[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnology0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsGeneral EnergyBand bendingQuantum dotatomic layer depositionOptoelectronicsphotoluminescence0210 nano-technologybusiness
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Tailoring the Structural, Optical, and Photoluminescence Properties of Porous Silicon/TiO2 Nanostructures

2015

The structural, optical, and photoluminescence properties of porous silicon (PSi)/titanium dioxide (TiO2) nanostructures were investigated. PSi structures consisting of macro- and mesoporous layers were fabricated by metal-assisted chemical etching, and then TiO2 was introduced inside the PSi matrix using the atomic layer deposition technique. We performed scanning electron microscopy, transmission electron microscopy (TEM), X-ray diffraction, energy dispersive X-ray spectroscopy, Raman spectroscopy, ellipsometry, and photoluminescence (PL) spectroscopy to characterize the prepared and annealed PSi/TiO2 nanostructures. TEM and Raman analyses revealed that TiO2 had a crystalline anatase stru…

AnatasePhotoluminescenceMaterials scienceScanning electron microscopeAnalytical chemistryPorous siliconSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsAtomic layer depositionsymbols.namesakeGeneral EnergyEllipsometrysymbolsPhysical and Theoretical ChemistrySpectroscopyRaman spectroscopyThe Journal of Physical Chemistry C
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Optical properties of ZnO deposited by atomic layer deposition (ALD) on Si nanowires

2018

International audience; In this work, we report proof-of-concept results on the synthesis of Si core/ ZnO shell nanowires (SiNWs/ZnO) by combining nanosphere lithography (NSL), metal assisted chemical etching (MACE) and atomic layer deposition (ALD). The structural properties of the SiNWs/ZnO nanostructures prepared were investigated by X-ray diffraction, Raman spectroscopy, scanning and transmission electron microscopies. The X-ray diffraction analysis revealed that all samples have a hexagonal wurtzite structure. The grain sizes are found to be in the range of 7-14 nm. The optical properties of the samples were investigated using reflectance and photoluminescence spectroscopy. The study o…

PhotoluminescenceMaterials scienceNanowire02 engineering and technology010402 general chemistry01 natural sciencesSilicon nanowires (SiNWs)symbols.namesakeAtomic layer depositionnanosphere lithography (NSL)metal-assisted chemical etching (MACE)atomic layer deposition (ALD)[CHIM]Chemical SciencesGeneral Materials ScienceSpectroscopyWurtzite crystal structurebusiness.industryMechanical Engineering021001 nanoscience & nanotechnologyCondensed Matter PhysicsIsotropic etching0104 chemical sciencesMechanics of Materialssymbols:NATURAL SCIENCES [Research Subject Categories]ZnONanosphere lithographyOptoelectronics0210 nano-technologyRaman spectroscopybusiness
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Tuning of ZnO 1D nanostructures by atomic layer deposition and electrospinning for optical gas sensor applications

2015

We explored for the first time the ability of a three-dimensional polyacrylonitrile/ZnO material—prepared by a combination of electrospinning and atomic layer deposition (ALD) as a new material with a large surface area—to enhance the performance of optical sensors for volatile organic compound (VOC) detection. The photoluminescence (PL) peak intensity of these one-dimensional nanostructures has been enhanced by a factor of 2000 compared to a flat Si substrate. In addition, a phase transition of the ZnO ALD coating from amorphous to crystalline has been observed due to the properties of a polyacrylonitrile nanofiber template: surface strain, roughness, and an increased number of nucleation …

PhotoluminescenceMaterials scienceNucleationBioengineeringNanotechnology02 engineering and technologyengineering.material010402 general chemistry01 natural sciencesAtomic layer depositionchemistry.chemical_compoundCoating[CHIM]Chemical SciencesGeneral Materials ScienceElectrical and Electronic EngineeringComputingMilieux_MISCELLANEOUSbusiness.industryMechanical EngineeringPolyacrylonitrileGeneral Chemistry021001 nanoscience & nanotechnologyElectrospinning0104 chemical sciencesAmorphous solidchemistryMechanics of MaterialsNanofiberengineeringOptoelectronics0210 nano-technologybusiness
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Study on Structural, Mechanical, and Optical Properties of Al2O3–TiO2 Nanolaminates Prepared by Atomic Layer Deposition

2015

Structural, optical, and mechanical properties of Al2O3/TiO2 nanolaminates fabricated by atomic layer deposition (ALD) were investigated. We performed transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray reflectivity (XRR), energy dispersive X-ray spectroscopy (EDX), ellipsometry, UV–vis spectroscopy, photoluminescence (PL) spectroscopy, and nanointendation to characterize the Al2O3/TiO2 nanolaminates. The main structural, optical, and mechanical parameters of Al2O3/TiO2 nanolaminates (thickness, grain size, refractive index, extinction coefficient, band gap, hardness, and Young’s module) were calculated. It was established that with decreasing of the layer thickness, the …

PhotoluminescenceMaterials scienceBand gapAnalytical chemistryGrain sizeSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsX-ray reflectivityAtomic layer depositionGeneral EnergyEllipsometryPhysical and Theoretical ChemistryComposite materialSpectroscopyRefractive indexThe Journal of Physical Chemistry C
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