X-ray Diffraction, XPS, and Raman Spectroscopy of Coated ZnO:Al (1—7 at%) Nanoparticles

Konan, Fransisco Kouadio; Hartiti, Bouchaíb; Batan, Abdelkrim; Aka, Boko

doi:10.1380/ejssnt.2019.163

Cited by 12 publications

(5 citation statements)

References 37 publications

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“…The Zn2p high-resolution spectrum shows that in the TiO 2 /ZnO hybrid nanosponges the doublet peaks corresponding to Zn2p 1/2 and Zn2p 3/2 can be appreciated at approximately 1045.2 and 1022 eV, respectively, and the distance between them is about 23.2 eV. These results proved that Zn species are in its Zn +2 oxidation state, confirming the presence of ZnO in the TiO 2 /ZnO nanostructures [ 23 , 25 , 49 , 51 , 52 , 54 ].…”

Section: Resultsmentioning

confidence: 61%

“…It can be observed that, in all XPS spectra, the peak corresponding to C1s at position 284.6 eV appears, which is a fact related to the organic species involved in the preparation (glycerol) and to the contaminants adsorbed in the nanostructures. C1s peak position can be used as a reference for the rest of the peaks involved in the XPS spectra [ 23 , 51 ]. As expected, peaks related to Zn are only observed in TiO 2 /ZnO hybrid nanostructures.…”

Section: Resultsmentioning

confidence: 99%

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Original Approach to Synthesize TiO2/ZnO Hybrid Nanosponges Used as Photoanodes for Photoelectrochemical Applications

et al. 2021

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In the present work, TiO2/ZnO hybrid nanosponges have been synthesized for the first time. First, TiO2 nanosponges were obtained by anodization under hydrodynamic conditions in a glycerol/water/NH4F electrolyte. Next, in order to achieve the anatase phase of TiO2 and improve its photocatalytic behaviour, the samples were annealed at 450 °C for 1 h. Once the TiO2 nanosponges were synthesized, TiO2/ZnO hybrid nanosponges were obtained by electrodeposition of ZnO on TiO2 nanosponges using different temperatures, times, and concentrations of zinc nitrate (Zn(NO3)2). TiO2/ZnO hybrid nanosponges were used as photoanodes in photoelectrochemical water splitting tests. The results indicate that the photoelectrochemical response improves, in the studied range, by increasing the temperature and the Zn(NO3)2 concentration during the electrodeposition process, obtaining an increase in the photoelectrochemical response of 141% for the TiO2/ZnO hybrid nanosponges electrodeposited at 75 °C with 10 mM Zn(NO3)2 for 15 min. Furthermore, morphological, chemical, and structural characterization was performed by Field Emission Scanning Electron Microscopy (FE-SEM) with Energy Dispersive X-Ray spectroscopy (EDX), Raman Confocal Laser Spectroscopy, X-Ray Photoelectron Spectroscopy (XPS), and Grazing Incidence X-Ray Diffraction (GIXRD).

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Original Approach to Synthesize TiO2/ZnO Hybrid Nanosponges Used as Photoanodes for Photoelectrochemical Applications

et al. 2021

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“…Raman spectroscopy has been used for qualitative and quantitative studies of electronphonon interaction in nanostructured ZnO films in CF/ZnO_nr and CF/ZnO_ns samples because it is sensitive to lattice distortions, crystal defects, and phase transformations [13,[15][16][17][18][19][20]. The vibrational phonon modes of the nanostructured ZnO layers were characterized using a Raman microscope (Thermofisher Nicolet DXR Microscope, Thermo Fisher Scientific Inc., Waltham, MA, USA) with a solid-state diode green laser with an excitation wavelength of 532 nm and a power of 10 mW.…”

Section: Methodsmentioning

confidence: 99%

Triboelectric Nanogenerators Based on Nanostructured Layers of Zinc Oxide Deposited on Carbon Fabric

Petrushenko,

Fijalkowski,

Kopach

et al. 2023

J. Compos. Sci.

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In this work, to obtain textile triboelectric layers for wearable flexible triboelectric nanogenerators (TENGs), we used two modes of growing nanostructured zinc oxide (ZnO) arrays on a carbon fabric (CF) using the automatic Successive Ionic Layer Adsorption and Reaction (SILAR) method. To produce a CF/ZnO_nr triboelectric textile with an array of intergrown short ZnO nanorods, we used a pre-coating of carbon fibers with ZnO seed layers. When the ZnO layer was fabricated by automatic SILAR on bare carbon fabric, we obtained the CF/ZnO_ns textile with an array of interconnected ZnO nanosheets 50–100 nm thick. As a proof of concept, we developed and tested two prototypes of flexible vertical contact–separation mode CF/ZnO_nr/PET/ITO and CF/ZnO_ns/PET/ITO TENGs, in which a gap was involuntarily formed between the smooth PET layer and the woven carbon textile coated with nanostructured ZnO films. In pressing tests with a force of ~5 N (pressure ~33 kPa), the CF/ZnO_ns/PET/ITO TENG created a higher open-circuit voltage up to 30 V and a higher maximum surface charge density of 1.3 μC/m2. In the successive press–release tests, this TENG showed an output voltage of 3.6 V, a current density of 1.47 μA/cm2, and a power density of 1.8 µW/cm2, confirming its effectiveness.

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“…The average crystallite size (D) was determined from the broadening of X-ray lines using the Scherrer formula [57]:…”

Section: Optical Spectra and Surface Resistancementioning

confidence: 99%

The Influence of Lyophobicity and Lyophilicity of Film-Forming Systems on the Properties of Tin Oxide Films

Dmitriyeva,

Lebedev,

Bondar

et al. 2023

Coatings

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In this work, the effects of lyophobicity and lyophilicity of film-forming systems on the properties of thin nanostructured films was studied. Systematic series of experiments were carried out with lyophilic film-forming systems: SnCl4/EtOH, SnCl4/EtOH/NH4F, SnCl4/EtOH/NH4OH and lyophobic systems: SnO2/EtOH and SnO2/EtOH/NH4F. Film growth mechanisms are determined depending on the type of film-forming system. The surface of the films was studied using a scanning electron microscope and an optical microscope. The spectrophotometric method is used to study the transmission spectra and the extinction coefficient. The surface resistance of the films was determined using the four-probe method. The quality factor and specific conductivity of the films are calculated. It was found that the addition of a fluorinating agent (NH4F) to a film-forming system containing SnO2 in the form of a dispersed phase does not lead to an increase in the specific conductivity of the films. X-ray diffraction analysis proved the incorporation of fluorine ions into the structure of the film obtained from the SnCl4/EtOH/NH4F system by the presence of SnOF2 peaks. In films obtained from SnO2/EtOH/NH4F systems, there are no SnOF2 peaks. In this case, ammonium fluoride crystallizes as a separate phase and decomposes into volatile compounds.

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X-ray Diffraction, XPS, and Raman Spectroscopy of Coated ZnO:Al (1—7 at%) Nanoparticles

Cited by 12 publications

References 37 publications

Original Approach to Synthesize TiO2/ZnO Hybrid Nanosponges Used as Photoanodes for Photoelectrochemical Applications

Original Approach to Synthesize TiO2/ZnO Hybrid Nanosponges Used as Photoanodes for Photoelectrochemical Applications

Triboelectric Nanogenerators Based on Nanostructured Layers of Zinc Oxide Deposited on Carbon Fabric

The Influence of Lyophobicity and Lyophilicity of Film-Forming Systems on the Properties of Tin Oxide Films

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