Deposition and photo-induced electrical resistivity of dip-coated NiO thin films from a precipitation process

Silva, Marcelo R. Da; Scalvi, Luís Vicente de Andrade; Dall’Antônia, Luiz Henrique; Santos, Dayse Iara dos

doi:10.1007/s10854-012-1019-8

Cited by 4 publications

(4 citation statements)

References 36 publications

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“…The absorption edge of sample 1 (Fig. 6a), corresponding to NiO film alone, occurs at about 350 nm, UV region, typical of this semiconductor material [34,44]. The inset in Fig.…”

Section: Resultsmentioning

confidence: 95%

“…vacancy level which is an acceptor trap (represented by Ain Fig. 8b with green color), since there is not energy enough for generation of electron-hole pairs in this material [34]. In this case, an increase in the holes density is obtained in the valence band of NiO.…”

Section: Resultsmentioning

confidence: 97%

“…This green gel was diluted in 50 mL of deionized water, resulting in a greenish solution that was called solution ''A'', which was used as precursor solution for the BiVO 4 thin film deposition. The NiO p-type semiconductor solution was obtained by precipitation in aqueous media, also adapted from widely published procedures [32][33][34]. Firstly, 100 mL of 0.5 mol L -1 Ni(NO 3 ) 2 Á6H 2 O (Sigma-Aldrich) was prepared.…”

Section: Synthesis Of N-bivo 4 and P-nio Semiconductor Solutionsmentioning

confidence: 99%

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Dip-coating deposition of BiVO4/NiO p–n heterojunction thin film and efficiency for methylene blue degradation

Silva

Scalvi

Neto

et al. 2015

J Mater Sci: Mater Electron

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This paper deals with a simple FTO/p-n heterojunction electrode assembly formed by BiVO 4 and NiO thin films, where the precursor solution is obtained by solution combustion synthesis and precipitation in aqueous media techniques, respectively, whereas the thin films were deposited by the dip-coating deposition process. The FTO/p-n electrodes are characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy and UV-Vis spectroscopy. The performance analysis based on the methylene blue degradation reaction have shown that the p-n electrodes, FTO/p-NiO/n-BiVO 4 and FTO/n-BiVO 4 /p-NiO have higher electroactivity under visible light irradiation condition when compared to single BiVO 4 thin film, deposited separately, with estimated k obs value of 340 9 10-4 min-1 , 270 9 10-4 min-1 and 150 9 10-4 min-1 , respectively.

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“…The absorption edge of sample 1 (Fig. 6a), corresponding to NiO film alone, occurs at about 350 nm, UV region, typical of this semiconductor material [34,44]. The inset in Fig.…”

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 97%

Section: Synthesis Of N-bivo 4 and P-nio Semiconductor Solutionsmentioning

confidence: 99%

See 1 more Smart Citation

Dip-coating deposition of BiVO4/NiO p–n heterojunction thin film and efficiency for methylene blue degradation

Silva

Scalvi

Neto

et al. 2015

J Mater Sci: Mater Electron

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“…NiO nanosheets have been produced from NiCl 2 and NaOH using thermal decomposition [ 47 ], biosynthesis [ 48 , 49 ] and the microemulsion method [ 50 ]. Furthermore, precipitation [ 51 ], temperature programmed decomposition (TPD) [ 52 ], solid-state decomposition [ 53 ] and the sonochemical method [ 54 ] were also applied. NiO has been produced through the precipitation technique from NiCl 2 and urea [ 55 ].…”

Section: Introductionmentioning

confidence: 99%

Identification of Nano-Metal Oxides That Can Be Synthesized by Precipitation-Calcination Method Reacting Their Chloride Solutions with NaOH Solution and Their Application for Carbon Dioxide Capture from Air—A Thermodynamic Analysis

Khine

Kaptay

2023

Materials

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Several metal oxide nanoparticles (NPs) were already obtained by mixing NaOH solution with chloride solution of the corresponding metal to form metal hydroxide or oxide precipitates and wash—dry—calcine the latter. However, the complete list of metal oxide NPs is missing with which this technology works well. The aim of this study was to fill this knowledge gap and to provide a full list of possible metals for which this technology probably works well. Our methodology was chemical thermodynamics, analyzing solubilities of metal chlorides, metal oxides and metal hydroxides in water and also standard molar Gibbs energy changes accompanying the following: (i) the reaction between metal chlorides and NaOH; (ii) the dissociation reaction of metal hydroxides into metal oxide and water vapor and (iii) the reaction between metal oxides and gaseous carbon dioxide to form metal carbonates. The major result of this paper is that the following metal-oxide NPs can be produced by the above technology from the corresponding metal chlorides: Al2O3, BeO, CaO, CdO, CoO, CuO, FeO, Fe2O3, In2O3, La2O3, MgO, MnO, Nd2O3, NiO, Pr2O3, Sb2O3, Sm2O3, SnO, Y2O3 and ZnO. From the analysis of the literature, the following nine nano-oxides have been already obtained experimentally with this technology: CaO, CdO, Co3O4, CuO, Fe2O3, NiO, MgO, SnO2 and ZnO (note: Co3O4 and SnO2 were obtained under oxidizing conditions during calcination in air). Thus, it is predicted here that the following nano-oxides can be potentially synthesized with this technology in the future: Al2O3, BeO, In2O3, La2O3, MnO, Nd2O3, Pr2O3, Sb2O3, Sm2O3 and Y2O3. The secondary result is that among the above 20 nano-oxides, the following five nano-oxides are able to capture carbon dioxide from air at least down to 42 ppm residual CO2-content, i.e., decreasing the current level of 420 ppm of CO2 in the Earth’s atmosphere at least tenfold: CaO, MnO, MgO, CdO, CoO. The tertiary result is that by mixing the AuCl3 solution with NaOH solution, Au nano-particles will precipitate without forming Au-oxide NPs. The results are significant for the synthesis of metal nano-oxide particles and for capturing carbon dioxide from air.

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Photoelectrochemical properties of FTO/p-NiO electrode induced by UV light irradiation

Silva

Neto

Lucilha

et al. 2014

Ionics

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Deposition and photo-induced electrical resistivity of dip-coated NiO thin films from a precipitation process

Cited by 4 publications

References 36 publications

Dip-coating deposition of BiVO4/NiO p–n heterojunction thin film and efficiency for methylene blue degradation

Dip-coating deposition of BiVO4/NiO p–n heterojunction thin film and efficiency for methylene blue degradation

Identification of Nano-Metal Oxides That Can Be Synthesized by Precipitation-Calcination Method Reacting Their Chloride Solutions with NaOH Solution and Their Application for Carbon Dioxide Capture from Air—A Thermodynamic Analysis

Photoelectrochemical properties of FTO/p-NiO electrode induced by UV light irradiation

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