Structural, thermal and magnetic investigations of heavily Mn-doped ZnO nanoparticles

Duan, Libing; Zhao, Xiaoru; Liu, Jinming; Geng, Wangchang; Xie, Haiyan; Chen, Shuai

doi:10.1016/j.jmmm.2011.04.018

Cited by 27 publications

(10 citation statements)

References 40 publications

(66 reference statements)

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“…As it can be seen in Table 3, the Mn 2+ atomic percentage decreases with increasing the manganese content, whereas the Mn 4+ concentration increases with increasing the manganese content. Similar results were obtained by Duan et al [50] and Singhal et al…”

Section: Catalysts Characterizationsupporting

confidence: 91%

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Structural and optical properties of ZnO and manganese-doped ZnO

Gallegos

Peluso

Thomas

et al. 2016

Journal of Alloys and Compounds

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The structural, morphological and optical properties of manganese oxides supported on commercial ZnO, prepared by impregnation with manganese nitrate, were investigated. The nominal compositions of Mn in the samples were 5, 10, 15 and 20 %w/w.The Xray diffraction (XRD) experiments revealed the presence of the ZnO wurtzite phase in all the samples, and ZnMnO 3 was also found in the samples with 15 wt% and 20 wt% of Mn. X-ray photoelectron spectroscopy (XPS) showed the presence of Mn 2+ and Mn 4+ in the xMnZnO samples. The results showed that the Mn 2+ ions had

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Section: Catalysts Characterizationsupporting

confidence: 91%

“…doped ZnO due to the replacement of Zn 2+ at the lattice site, while Mn 4+ might be assigned to the ZnMnO 3 impurity phase [50]. The area of the two different valence bonds was calculated in order to estimate the atomic concentration of Mn 2+ and Mn 4+ .…”

Section: Catalysts Characterizationmentioning

confidence: 99%

Structural and optical properties of ZnO and manganese-doped ZnO

Gallegos

Peluso

Thomas

et al. 2016

Journal of Alloys and Compounds

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“…TiO 2 and ZnO, which are benchmark UV photocatalysts have very low activity in visible light due to their wide band gaps (above 3 eV) [73,74]. In order to apply sunlight for photocatalytic degradation of contaminants, the semiconductors need to be modified by incorporation of transition metals [75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94], semiconductor plasmon coupling [72,[95][96][97][98][99][100][101], incorporating nonmetals including co-doping of nonmetals [102][103][104][105][106] or by nanostructure engineering (creating oxygen vacancies and oxygen sub-stoichiometry) [107,108]. These processes create quasi stable energy states within the band gap facilitating electron hole pair formation at photon energies less than the band gap [33,34,[109][110][111][112].…”

Section: Making Zno Visible Light Activementioning

confidence: 99%

Nanostructured Zinc Oxide for Water Treatment

Baruah¹,

Pal²,

Dutta

2012

NANOASIA

136

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Environmental pollution and industrialization on a global scale have drawn attention to the vital need for developing new hygienically friendly purification technologies. Existing wastewater treatment technologies demand high capital investment and operation & maintenance cost, and large area. Cost-effective treatment of pollutants requires the transformation of hazardous substances into benign forms and the subsequent development of effective risk management strategies from harmful effects of pollutants that are highly toxic, persistent, and difficult to treat. Application of nanotechnology that results in improved water treatment options might include removal of the finest contaminants from water (< 300 nm) and "smart materials" or "reactive surface coatings" with engineered specificity to a certain pollutant that destroy, transform or immobilize toxic compounds. Nanomaterials have been gaining increasing interest in the area of environmental remediation mainly due to their enhanced surface and also other specific changes in their physical, chemical and biological properties that develop due to size effects. Heterogeneous photocatalytic systems via metal oxide semiconductors like TiO 2 and ZnO, are capable of operating effectively and efficiently for waste water treatment which has been discussed along with other nanotechnology routes that can be useful for water treatments. Multifunctional photocatalytic membranes using ZnO nanostructures are considered advantageous over freely suspended nanoparticles due to the ease of its removal from the purified water. A short discussion on the study of charge transfer mechanisms during photocatalytic reactions has also been included.

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“…High Curie temperature (T c ) is also another requirement to improve the application of DMS films, whereby as reported in the literature the DMO are candidates to achieve high T c [9][10][11]. Origin of certain properties like ferromagnetism in nanostructured DMO's is still matter of discussion [12], hence the study of nanostructured DMO doped with TM could contribute to recognize these properties. Several studies are focused in semiconductors with magnetic characteristics at room temperature, to use their physico-chemical properties in realizing and to improve important devices like spin-LED [13], spin-transistors [14], logic devices [15] and magnetic memories (MRAM) [16].…”

Section: Introductionmentioning

confidence: 99%