The influence of methanol and NH4Cl on solvothermal ZnO synthesis and properties

Marin, Oscar; González, Vanessa; Budini, Nicolás; Tirado, Mónica; Comedi, D.

doi:10.1007/s00339-020-03636-w

Cited by 6 publications

(3 citation statements)

References 51 publications

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“…Some reports indicate that the green emission (≈2.3–2.5 eV) at 500, [ 45,46 ] 516, [ 47 ] and 534 nm [ 48 ] originates both from electron transitions from single ionized oxygen vacancies V O ( V O + ) toward the valence band and to electronic transitions involving V O –zinc interstitial ( V O –Zn i ) complexes. [ 49,50 ] The peak at about 521 nm (≈2.38 eV) [ 51 ] was assigned to the oxide antisite defect O Zn , and that centered at 560 nm (≈2.21 eV) to zinc vacancies. [ 52 ]…”

Section: Resultsmentioning

confidence: 99%

“…) toward the valence band and to electronic transitions involving V O -zinc interstitial (V O -Zn i ) complexes. [49,50] The peak at about 521 nm (%2.38 eV) was assigned to the oxide antisite defect O Zn , and that centered at 560 nm (%2.21 eV) to zinc vacancies. [52] The UV-vis intensity ratio is the most evident difference between the two samples, being considerably higher in the ZnO-a sample, while the other defect-related peaks are slightly smaller than in the ZnO-r sample.…”

Section: Photoluminescencementioning

confidence: 99%

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Magnetotransport Properties of Microstructured ZnO Thin Films Grown on a‐ and r‐Plane Sapphire Substrates

Barzola‐Quiquia¹,

Zelaya

Espíndola

et al. 2023

Physica Status Solidi (b)

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The transparent semiconductor ZnO has attracted substantial interest in the research community because of its potential applications as a transparent thin film, [1][2][3] transistor, [4][5][6] optoelectronic devices, [7][8][9] light-emitting diode, [10,11] among others. Another promising, non-inherent property is its roomtemperature ferromagnetism, which was first theoretically predicted to occur through doping with transition magnetic ions such as Fe, Co, or Ni. [12] However, many experimental studies revealed that the observed magnetic order is not related to the doping but certain defects. [13][14][15][16][17] A ferromagnetic ZnO, free of d-elements, opens new opportunities for applications in spintronics. The origin of the defect-induced magnetism (DIM) in defective ZnO samples is not always simple to explain, especially in samples where defects are introduced during the preparation of the samples, like Zn-or O-vacancies [15] or grain boundaries. [18] In these cases, the reproducibility of the magnetic order is low. Also, usual experimental techniques, such as SQUID (superconducting quantum interface device) magnetometry, cannot simply distinguish between defect-induced magnetic signals and those from other sources, like magnetic impurities on the samples or substrates. [19] However, recent theoretical and experimental studies using element-specific magnetic probes like X-ray magnetic circular dichroism (XMCD) in X-ray absorption spectroscopy [20] strongly suggest that Zn vacancies are the primary origin for the observed magnetic order in this compound. Oxygen vacancies, present in a more significant concentration than Zn vacancies, do not substantially contribute to the magnetic order due to their much smaller magnetic moment.Due to the low mass of thin films and weak magnetic signals (compared to the substrate), standard SQUID magnetometers are not the best choice for the magnetic characterization of ZnO thin films. Accounting for the influence of substrates by performing electrical transport measurements with an applied magnetic field is helpful. The measurement of the magnetoresistance (MR) and Hall effect (HE) [21] are powerful tools to explore the magnetic properties of conducting materials. In the case of MR, the sign of ferromagnetism is the opening of a butterfly-like hysteresis around zero field with extremes at fields corresponding to the coercive fields (H C ). When considering the HE, the appearance of an anomalous nonlinear contribution at low fields, in addition to the opening of a hysteresis with sign changes at fields corresponding to the coercive field, would be the case. We notice, however, that the field hysteresis depends on the coercive field of the investigated sample. Because H C is relatively weak in magnetic ZnO samples, that is, μ 0 Â H C ≤ 0.1 T, [15] high resolution is necessary to measure the hysteresis around zero field in the MR or HE. In general, with the field and temperature dependence of electrical-transport properties, it is possible to

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Section: Resultsmentioning

confidence: 99%

Section: Photoluminescencementioning

confidence: 99%

Magnetotransport Properties of Microstructured ZnO Thin Films Grown on a‐ and r‐Plane Sapphire Substrates

Barzola‐Quiquia¹,

Zelaya

Espíndola

et al. 2023

Physica Status Solidi (b)

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“…Indeed, a chemical (wet) process plays a significant role in the synthesis of the ZnO with very small particle size, known as active ZnO (A-ZnO). This process could be done by a variety of techniques, for example, mechanochemical process, [4][5][6][7] controlled precipitation, [8][9][10] sol-gel method, [11][12][13][14][15] hydrothermal, [16][17][18][19][20] solvothermal, [21][22][23] sonochemical, [24][25][26][27] and so forth.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of zinc oxide‐coated microcrystalline cellulose and its application in truck tire tread compounds

Boopasiri

Thaptong

Sae‐Oui

et al. 2022

J of Applied Polymer Sci

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The severe threat to aquatic environment from zinc oxide (ZnO) in tread debris has become a serious issue for tire manufacturers. Various attempts including the utilization of composite ZnO have therefore been made to reduce ZnO content in tread compounds. In this study, a new composite ZnO was prepared by depositing ZnO nanoparticles on microcrystalline cellulose (MCC) through hydrothermal reactions, called M-ZnO. After characterization by various techniques, cure activation efficiency of M-ZnO in truck tire tread compound was investigated and compared with that of active ZnO (A-ZnO).The results showed that M-ZnO contained approximately 66.7% w/w of ZnO and had comparable specific surface area to A-ZnO. Regardless of the ZnO type, crosslink density increased with increasing ZnO content up to 3 phr leading to the improved mechanical properties of the rubber vulcanizates, that is, hardness, modulus, and abrasion resistance. Tensile and tear strengths, however, were found maximum at 2 phr of both A-ZnO and M-ZnO. Although wet grip index was independent of ZnO content, rolling resistance tended to reduce with increasing ZnO content. The results clearly show the great potential of utilizing M-ZnO to replace conventional A-ZnO in tread compounds when more stringent environmental regulations are imposed.

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Argon plasma-enhanced UV light emission from ZnO submicrowires grown by hydrothermal method

Zelaya,

Di Donato,

Rozas

et al. 2024

Journal of Alloys and Compounds

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The influence of methanol and NH4Cl on solvothermal ZnO synthesis and properties

Cited by 6 publications

References 51 publications

Magnetotransport Properties of Microstructured ZnO Thin Films Grown on a‐ and r‐Plane Sapphire Substrates

Magnetotransport Properties of Microstructured ZnO Thin Films Grown on a‐ and r‐Plane Sapphire Substrates

Fabrication of zinc oxide‐coated microcrystalline cellulose and its application in truck tire tread compounds

Argon plasma-enhanced UV light emission from ZnO submicrowires grown by hydrothermal method

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