Sol-gel synthesis of ZnO/Zn2-xFexTiO4 powders: structural properties, electrical conductivity and dielectric behavior

Dascalu, Izabella; Hornoiu, Cristian; Calderón-Moreno, José Maria; Enache, Mădălin; Culiță, Daniela C.; Şomăcescu, Simona

doi:10.1007/s10971-018-4623-0

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…The software Z-view was used to fit the impedances of specific electrical circuits to the Nyquist experimental data (Nyquist representations) [ 1 , 13 , 14 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

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Layered Sol–Gel Deposition of a Sn, Ti, Zn, and Pr Mixed Oxide Thin Film with Electrical Properties for Gas Sensing

Dascalu

Hornoiu

Moreno

et al. 2023

Gels

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This article presents a layered mixed oxide thin film composed of Sn, Ti, Zn, and Pr obtained by sol–gel deposition for gas sensing applications. The film was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV-Vis spectroscopy, Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), and Electrochemical impedance spectroscopy (EIS). X-ray diffraction results showed the presence of a single crystalline phase with a cassiterite-like structure. Raman spectroscopy revealed characteristic bands of oxygen-deficient SnO2-based nanocrystallites. The band gap energy calculated from UV-Vis spectroscopy is Eg = 3.83 eV. The XPS proved the presence on the surface of all elements introduced by the inorganic precursors as well as their oxidation states. Thus, Sn4+, Ti4+, Zn2+, and Pr3+ were detected on the surface. Moreover, by XPS, we highlighted the presence of OH groups and water adsorbed on the surface. SEM showed the five-layer morphology of the film after five successive depositions. Electrochemical properties were determined by EIS-impedance spectroscopy. The selectivity for gas sensing was also investigated for methane, propane, and formaldehyde and the gas sensing mechanism was explained. The results indicated that the mixed oxide thin film exhibited high sensitivity and selectivity towards specific gases.

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“…The software Z-view was used to fit the impedances of specific electrical circuits to the Nyquist experimental data (Nyquist representations) [ 1 , 13 , 14 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

“…Materials based on metal oxides can be obtained by using the sol–gel method [ 13 , 14 , 15 ], one of the most widely used methods that offers the possibility of producing various materials with new, predefined properties in a simple process and at a relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

Layered Sol–Gel Deposition of a Sn, Ti, Zn, and Pr Mixed Oxide Thin Film with Electrical Properties for Gas Sensing

Dascalu

Hornoiu

Moreno

et al. 2023

Gels

Self Cite

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“…The combination of noble metals with another cheaper and more abundant transition metal was also studied [25]. Among the transition metals whose ions are capable of modifying the optoelectronic properties of TiO 2 , the following stood out: V, Cr, Fe, Co, Ni, Cu, and Zn [22][23][24][26][27][28]31]. The immobilization of these metals on TiO 2 /zeolite created active species, modified the surface properties, promoted photoinduced carrier separation, and consequently enhanced the photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Composite Photocatalysts with Fe, Co, and Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Petcu,

Anghel,

Atkinson

et al. 2024

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Ti-aluminosilicate gels were used as supports for the immobilization of Fe, Co, and Ni oxides (5%) by impregnation and synthesis of efficient photocatalysts for the degradation of β-lactam antibiotics from water. Titanium oxide (1 and 2%) was incorporated into the zeolite network by modifying the gel during the zeolitization process. The formation of the zeolite Y structure and its microporous structure were evidenced by X-ray diffraction and N2 physisorption. The structure, composition, reduction, and optical properties were studied by X-ray diffraction, H2-TPR, XPS, Raman, photoluminescence, and UV–Vis spectroscopy. The obtained results indicated a zeolite Y structure for all photocatalysts with tetracoordinated Ti4+ sites. The second transitional metals supported by the post-synthesis method were obtained in various forms, such as oxides and/or in the metallic state. A red shift of the absorption edge was observed in the UV–Vis spectra of photocatalysts upon the addition of Fe, Co, or Ni species. The photocatalytic performances were evaluated for the degradation of cefuroxime in water under visible light irradiation. The best results were obtained for iron-immobilized photocatalysts. Scavenger experiments explained the photocatalytic results and their mechanisms. A different contribution of the active species to the photocatalytic reactions was evidenced.

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Role of Mn/Cr dual-doped ZnO nanoparticles of diluted magnetic semiconductors: influence on structural and electrical properties

2021

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Sol-gel method was used to successfully produce dilute magnetic semiconductor ( Zn 1−x−y Mn x Cr y O) nanoparticles. Fourier transforms infrared spectroscopy (FTIR) and electrical conductivity tests were used to investigate the structural and electrical properties of the prepared samples. FTIR spectra are used to examine the functional chemical bonding properties of various elements and compounds found in materials. The dopant's incorporation into the ZnO framework structure is confirmed by FTIR spectra. The dominance of the Mn-O or Cr-O interaction in the Zn-O-Mn or Zn-O-Cr bonds may result from an increase in Mn or Cr concentration in the wurtzite structure, which could lead to structural stress and defects. Within the frequency range of 0.042 kHz-1 MHz and the temperature range of 298-573(K), the conductivity (σ ac ) was measured. The increase in conductivity values is more pronounced for samples with lower doping concentrations of Mn and Cr. The maximum σ ac value is reached in the sample with 1.5% Mn and 0.5% Cr. The maximum ɛʹ value reached in the sample with 10% Cr. The prepared samples are considered as candidates for semiconductor materials in electronic devices.

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Sol-gel synthesis of ZnO/Zn2-xFexTiO4 powders: structural properties, electrical conductivity and dielectric behavior

Cited by 4 publications

References 35 publications

Layered Sol–Gel Deposition of a Sn, Ti, Zn, and Pr Mixed Oxide Thin Film with Electrical Properties for Gas Sensing

Layered Sol–Gel Deposition of a Sn, Ti, Zn, and Pr Mixed Oxide Thin Film with Electrical Properties for Gas Sensing

Composite Photocatalysts with Fe, Co, and Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis

Role of Mn/Cr dual-doped ZnO nanoparticles of diluted magnetic semiconductors: influence on structural and electrical properties

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