Synthesis of holmium oxide (Ho2O3) nanocrystal by chemical bath deposition

Rosa, L. Serrano de la; Portillo, M. Chávez; Mora-Ramírez, M.A.; Téllez, V. Carranza; Pacio, M.; Santiesteban, H. Juárez; Santiago, A. Cortés; Moreno, O. Portillo

doi:10.1016/j.ijleo.2020.164875

Cited by 13 publications

(13 citation statements)

References 36 publications

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“…The analysis revealed that the as-synthesized nanocrystals ranging between 4–8 nm in diameter (See Table 1 ) were highly crystalline and exhibited the hexagonal wurtzite structure (space group P 6 3 mc ) indexed to JCPDS card # 36-1451. Furthermore, no second phase originating from Ho 2 O 3 was observed in the Ho 3+ -doped ZnO samples [ 31 ], which confirms that the dopants successfully substituted the Zn 2+ ions within the ZnO lattice structure. The Scherrer equation was employed to estimate the crystallite size [ 32 ];

where D , λ , β , Ө and k are the crystallite size, the wavelength of the incident X-ray CuK radiation (0.15405 nm), the full width at half maximum (FWHM), the diffracting angle and a numerical constant (0.89), respectively.…”

Section: Resultsmentioning

confidence: 93%

Unveiling Semiconductor Nanostructured Based Holmium-Doped ZnO: Structural, Luminescent and Room Temperature Ferromagnetic Properties

2021

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This research work describes the synthesis of ZnO nanostructures doped with Ho3+ ions using a conventional sol–gel synthesis method. The nanostructured produced exhibited a wurtzite hexagonal structure in both ZnO and ZnO:Ho3+ (0.25, 0.5, 0.75 mol%) samples. The change in morphology with addition of Ho3+ dopants was observed, which was assigned to Ostwald ripening effect occurring during the nanoparticles’ growth. The photoluminescence emission properties of the doped samples revealed that Ho3+ was emitting through its electronic transitions. Moreover, reduced surface defects were observed in the Holmium doped samples whose analysis was undertaken using an X-ray Photoelectron Spectroscopy (XPS) technique. Finally, enhanced room temperature ferromagnetism (RT-FM) for Ho3+-doped ZnO (0.5 mol%) samples with a peak-to-peak line width of 452 G was detected and found to be highly correlated to the UV–VIS transmittance results.

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Section: Resultsmentioning

confidence: 93%

Unveiling Semiconductor Nanostructured Based Holmium-Doped ZnO: Structural, Luminescent and Room Temperature Ferromagnetic Properties

2021

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“…In other words, the properties of the coordination complex cation are associated with the physicochemical characteristics of the cation used (Cu 2+ , Co 2+ , Zn 2+ , Nd 3+ , Sm 3+ , etc.) in crystal growth [20][21][22][23].…”

Section: Experimental Partmentioning

confidence: 99%

Analysis of the conversion of Cadmium carbonate (CdCO3) to Cadmium oxide (CdO) in thin films with photocatalytic application

Coyotecatl,

Garrido,

Portillo

et al. 2024

Preprint

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The Cadmium Carbonate (CdCO3) films were successfully synthesized using the chemical bathroom deposition (CBD) technique to vary later the temperature from 30 ° C, 150 ° C, 300 ° C, 400 ° C and 500 ° C with the CdO was obtained. A step-by-step study was carried out of the chemical reaction coordination complex that is the basis for converting CdCO3 to CdO. With SEM it was possible to perform the morphological studio of the films of CdCO3 Showing a pyramidal shape in each of the samples. The vibration bands in the FTIR spectrum, located at range ~ 3600 − 400 cm-1, corresponding to characteristic vibrations of the carbonate ((CO3)−2) ion, carboxylates, and OH ions were identified. The X-ray diffraction (XRD) technique was applied to investigate the structural and microstructural properties of polycrystalline thin films and the phase change from CdCO3 to CdO. The optical properties of all films such as Absorption, Transmittance, and Reflectance were analyzed, getting a GAP of 1.87–2.37 eV. And, nanostructured films were applied to photocatalysis with a low percentage of photocatalytic efficiency of 8 ~ 14% in 90 minutes.

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“…However, the phenomenon of nucleation followed by growth and, in turn, the creation of ne nanoparticles with different GS averages, governed by the calcination temperature [21]. The microstructural behavior is directly related to the average grain size (GS) calculated using the Scherer's equation [22] 1…”

Section: Difracción De Rayos-x (Xrd)mentioning

confidence: 99%

Thin films ZnO-QDs Synthesis applying simultaneously the techniques of colloidal synthesis and sol gel and phenomenon at Zn2+→Zn3+ + e- charge transfer, applied to Shottky diode.

Garrido

Portillo

Ramírez

et al. 2023

Preprint

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The Zinc Oxide and the Quantum dots of ZnO (ZnO-QD´s) in thin solid films were deposited by dropwise method on glass substrates and calcined in air atmosphere at temperatures of 60 °C, 100 °C, 140 °C, 160 °C and 210 °C, respectively. The samples are examined applying the techniques: Scanning Electron Microscopy (SEM), x-Ray Diffraction (XRD), Fourier transforms in the Infrared (FTIR), Photoluminescence (PL), Transmittance (%T), and absorbance (α). Tauc model, the band gap (Eg) energy is evaluated. The electrical measurements of Current-Voltage (I-V), the concentration of charge carriers, mobility and Resistance, are registered by Hall Effect. The morphology of the layers shows a structural configuration with stacked compact plates and flakes-like of crystalline conglomerates with a fibrous appearance. The films show a Wurtzite-type crystalline phase according to the XRD diffractograms. The grain size increased by ~3.6-26.1 nm. The dislocation density (δ) presents a gradual increase with the calcination temperature δ(lines/m2) ~1.57 x 1015-2.22 x 1015. On FT-IR spectroscopy analysis, various vibrational bands are associated with the CO32 ion and by-products generated by the hydrolysis of zinc acetate di-hydrate discussed. The Eg undergoes oscillatory and disorderly shifting towards higher photon energy, caused by faults at crystalline lattice of Eg ~3.7-3.87 eV. In optical analysis, the discontinuity located at UV-Vis region is associated in principle at Zn2+→Zn3+ + e- charge transfer. PL spectra at UV-Vis region records the emission bands with different relative intensity. The asymmetric Gaussian curve is associated with intrinsic defects in the crystal lattice. The deconvolution of the Gaussian curve generates different emission bands assigned to: red (RE) at ~770 nm, blue (BE), green (GE) at ~492-520 nm and yellow (YE) at ~570-600 nm. The study and systematic construction of the Schottky diode is done by placing the corresponding thin film on ITO, then PEDOT: PSS was placed, then the silver contact and finally the p-n junction was identified, obtaining better results than QD's ZnO in the Shottky diode plot.

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Synthesis of holmium oxide (Ho2O3) nanocrystal by chemical bath deposition

Cited by 13 publications

References 36 publications

Unveiling Semiconductor Nanostructured Based Holmium-Doped ZnO: Structural, Luminescent and Room Temperature Ferromagnetic Properties

Unveiling Semiconductor Nanostructured Based Holmium-Doped ZnO: Structural, Luminescent and Room Temperature Ferromagnetic Properties

Analysis of the conversion of Cadmium carbonate (CdCO3) to Cadmium oxide (CdO) in thin films with photocatalytic application

Thin films ZnO-QDs Synthesis applying simultaneously the techniques of colloidal synthesis and sol gel and phenomenon at Zn2+→Zn3+ + e- charge transfer, applied to Shottky diode.

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