Sr- and Ni-doping in ZnO nanorods synthesized by a simple wet chemical method as excellent materials for CO and CO<sub>2</sub> gas sensing

Shirage, Parasharam M.; Rana, Amit Kumar; Kumar, Yogendra; Sen, Somaditya; Leonardi, Salvatore Gianluca; Neri, G.

doi:10.1039/c6ra15891a

Cited by 72 publications

(28 citation statements)

References 42 publications

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“…Although the change in the morphology of the nanostructured ZnO with increasing Mn 2+ concentration, observed by TEM and FTIR, is not a new phenomenon, a recently published review 38 regarding the inuence of ionic impurities on the phase and growth/morphology of semiconductor nanocrystals shows that, despite intensive research, there are fundamental issues still unsolved. Previous articles have reported morphological changes of the ZnO nanomaterials associated with the doping process, [39][40][41][42][43] which could be connected to specic structural and coordination properties, as further explained. The crystallographic plane with the minimum surface free energy determines the preferential growth direction.…”

Section: Ftir Measurementsmentioning

confidence: 72%

On the agent role of Mn²⁺ in redirecting the synthesis of Zn(OH)₂ towards nano-ZnO with variable morphology

et al. 2016

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One of the simplest routes to prepare polycrystalline Zn(OH) 2 is by coprecipitation, with zinc nitrate as a cation source. However, the addition of even minute amounts of manganese nitrate to the precursors used to prepare pure Zn(OH) 2 results in Mn 2+ doped nanostructured ZnO. The comparison with other Mn 2+ doped metal hydroxides prepared by the same coprecipitation method, involving metal nitrates precursors, shows that this behavior is unique, pertaining only to Zn(OH) 2 . A systematic study of the samples prepared without and with variable amounts of Mn 2+ ions, in the 1 to 5000 ppm nominal concentrations range showed that the re-routing of the reaction takes place even for the lowest nominal dopant concentration of 1 ppm. According to X-ray diffraction, transmission electron microscopy and Fourier transform infrared spectroscopy investigations, both crystallite size and morphology of the resulting nanostructured ZnO samples varied with the Mn 2+ nominal concentration. Moreover, quantitative electron paramagnetic resonance investigations showed that the incorporation rate of the Mn 2+ ions at different sites in the nanostructured ZnO depended on the nominal Mn 2+ concentration. The results are discussed in terms of the coordination properties of the Mn 2+ and Zn 2+ ions and the nature of the reaction precursors.Fig. 2 TEM/HRTEM images and the corresponding ED patterns (insets) for the ZnO samples doped with 1 ppm (a), 1000 ppm (b), 5000 ppm (c) Mn 2+ nominal concentration. (d) HRTEM image at larger magnification of the sample with Mn 2+ 5000 ppm nominal concentration. The ED patterns were indexed with the ZnO structure. 106734 | RSC Adv., 2016, 6, 106732-106741 This journal isFig. 3 Multiscan Q-band EPR spectra for the undoped (bottom) and Mn 2+ doped (upper) samples. The six hyperfine lines/doublet-lines of the Mn 2+ (a), Mn 2+ (d)/Mn 2+ (c) paramagnetic centers are marked with vertical bars.This journal is

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Section: Ftir Measurementsmentioning

confidence: 72%

On the agent role of Mn²⁺ in redirecting the synthesis of Zn(OH)₂ towards nano-ZnO with variable morphology

et al. 2016

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“…. The shifting of peak towards higher diffraction angle side is the evidence of lattice contractions 19 . This is due to the smaller cationic radius Li 1+ (0.167 nm) in comparison to V 5+ (0.171 nm).…”

Section: Resultsmentioning

confidence: 95%

“…This is due to the smaller cationic radius Li 1+ (0.167 nm) in comparison to V 5+ (0.171 nm). As a result of the substitution of the larger cationic radius of V by the smaller cationic radius of Li, the lattice compression (compressive strain) arises in the Li 0.04 V 2 O 5 crystalline phase 19 . Further comparing the peak intensities of the phases, it is observed that the intensity of the major phase Table 2.…”

Section: Resultsmentioning

confidence: 99%

Structural, optical, thermal and conducting properties of V2−xLixO5−δ (0.15 ≤ x ≤ 0.30) systems

Khan

Singh

2020

Sci Rep

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“…It clari es that there is no signi cant shift in the peak location. So, doping could not be happened [29]. No amorphous phase can be seen in DS9.…”

Section: The Effect Of Coating On the Nir Re Ectance Of The Powder Pimentioning

confidence: 97%

WITHDRAWN: Synthesizing and Characterizing the Hybrid Pigment Fe 0.7 Cr1.3 O3 With High NIR Reflectance for Sustainable Energy Saving Applications

Mobarhan¹,

Souri²,

Sks³

et al. 2021

Preprint

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Today, a growing number of the world population face a rise in the cost of living, especially an increase in energy costs. That is why Energy-saving has become a vital issue. In this regard, one of the remarkable ways to reduce energy consumption is using cool pigments; therefore, many kinds of research have been done to improve pigments' infrared reflection capability. In this paper, the role of particle morphology was investigated to boost the infrared reflection property of iron-chromium-based pigments. For this purpose, a series of inorganic pigments based on the Fe0.7Cr1.3O3 formula was prepared via a hydrothermal method. The particles' morphology was altered by using surfactants to improve the pigments' reflecting properties. The IR reflectance results proved that the flaky particles exhibit an enhanced IR reflection, which is significantly higher than in the spherical one. Furthermore, the results have revealed that silica coating leads to a meaningful improvement in the IR reflection property. It was found that the maximum near-infrared solar reflectance of the sample with 2.63% succinic acid surfactant and silica coating was 52.23% compared to that of Fe0.7Cr1.3O3, which was 25.36%.

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Sr- and Ni-doping in ZnO nanorods synthesized by a simple wet chemical method as excellent materials for CO and CO₂ gas sensing

Cited by 72 publications

References 42 publications

On the agent role of Mn²⁺ in redirecting the synthesis of Zn(OH)₂ towards nano-ZnO with variable morphology

On the agent role of Mn²⁺ in redirecting the synthesis of Zn(OH)₂ towards nano-ZnO with variable morphology

Structural, optical, thermal and conducting properties of V2−xLixO5−δ (0.15 ≤ x ≤ 0.30) systems

WITHDRAWN: Synthesizing and Characterizing the Hybrid Pigment Fe 0.7 Cr1.3 O3 With High NIR Reflectance for Sustainable Energy Saving Applications

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Sr- and Ni-doping in ZnO nanorods synthesized by a simple wet chemical method as excellent materials for CO and CO2 gas sensing

Cited by 72 publications

References 42 publications

On the agent role of Mn2+ in redirecting the synthesis of Zn(OH)2 towards nano-ZnO with variable morphology

On the agent role of Mn2+ in redirecting the synthesis of Zn(OH)2 towards nano-ZnO with variable morphology

Structural, optical, thermal and conducting properties of V2−xLixO5−δ (0.15 ≤ x ≤ 0.30) systems

WITHDRAWN: Synthesizing and Characterizing the Hybrid Pigment Fe 0.7 Cr1.3 O3 With High NIR Reflectance for Sustainable Energy Saving Applications

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Sr- and Ni-doping in ZnO nanorods synthesized by a simple wet chemical method as excellent materials for CO and CO₂ gas sensing

On the agent role of Mn²⁺ in redirecting the synthesis of Zn(OH)₂ towards nano-ZnO with variable morphology

On the agent role of Mn²⁺ in redirecting the synthesis of Zn(OH)₂ towards nano-ZnO with variable morphology