The effect of surfactants on the magnetic and optical properties of Co-doped SnO2 nanoparticles

He, Junhui; Liu, Xiao Fang; Zou, Zhi; Wu, Zengwen; He, Bo; Yu, Rong

doi:10.1016/j.apsusc.2011.08.037

Cited by 30 publications

(4 citation statements)

References 27 publications

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“…Combined with the above PL results, the improvement of ferromagnetism in the Co:ZnS nanostructures coincides with the enhancement of PL emissions resulting from the increase in the structural defects. Since the Co concentrations in the three samples are similar, it is deduced that the variation in the room-temperature ferromagnetism is caused by the change in the amount of structural defects, which seems to be consistent with the bound magnetic polaron (BMP) model [34]. Based on the BMP model, magnetic exchange interactions between defect-bound electrons and Co 2+ ions occupying the same space are proposed to align Co 2+ spins with respect to one another, forming a BMP.…”

Section: Resultssupporting

confidence: 59%

Structure dependent photoluminescence and magnetic properties of Co:ZnS nanostructures

Chen¹,

Yang²,

Liu³

et al. 2013

Phys. Scr.

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Co:ZnS nanostructures have been synthesized via the solvothermal method by modifying the stoichiometry of Zn and S sources in the solvothermal process. The structure and morphology analysis demonstrates that the increase of the Zn/S molar ratio leads to changes in the morphology and structure, from Co:ZnS nanorods and hexagonal nanocrystals to core–shell Co:ZnS/ZnO nanocrystals. The photoluminescence spectrum for Co:ZnS/ZnO exhibits strong visible light emissions due to the presence of a large amount of structural defects, whereas the emissions for Co:ZnS nanorods almost disappear because of the high crystallinity. All the samples display obvious room-temperature ferromagnetism. The saturated magnetic moment of the samples strongly depends on the concentration of structural defects in the nanostructures and can be effectively enhanced by the introduction of abundant defects.

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Section: Resultssupporting

confidence: 59%

Structure dependent photoluminescence and magnetic properties of Co:ZnS nanostructures

Chen¹,

Yang²,

Liu³

et al. 2013

Phys. Scr.

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“…Therefore, these factors are also responsible for the ferromagnetism in Co 2? substituted SnO 2 nanoparticles [30,[36][37][38]. It is evident from the plots, that magnetization values reduces with increased Co 2?…”

Section: Magnetic Studiesmentioning

confidence: 88%

Microwave assisted synthesis of Sn(1−x)CoxO2 nanoparticles: effect of impurity phase formation on structural, optical and electrochemical properties

Sephra

Baraneedharan

Chidambaram

et al. 2016

J Mater Sci: Mater Electron

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Nanocrystalline Sn (1-x) Co x O 2 (x = 0, 0.01, 0.03 and 0.05) nanoparticles have been synthesized under microwave irradiation using oxalic acid (H 2 C 2 O 4 ) as reducing agent. X-ray diffraction studies show that the prepared nanoparticles are crystalline with tetragonal crystal system and with few additional phases, which is further supported by Raman spectroscopy. The variation in molar concentration of Co 2? ions had a significant effect on size and morphological aspects which is evident from high resolution microscopic images. The emission owing to band edge position, recombination with V o ?? centers and recombination with shallow level defects were observed from the Photoluminescence spectrum. The existence of room temperature ferromagnetism has been clearly observed using magnetization hysteresis measurements and the magnetic moments are found to decrease with the increased cobalt ions concentration. The decrease in charge carriers that arises due to the formed impurity phases and its significant effect on electron transfer capability have been discussed with the assistance of cyclic voltammetry. This study possibly will bring better insight for understanding the effects of doping concentration, formation of impurity phases and explicate the consequences of them on various properties of nanostructured materials.

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“…RTFM in this undoped oxide semiconductors pointed out that the magnetic behavior of the material is not related by the presence of magnetic ions but by the point defects like tin interstitial, oxygen vacancies and quantum confinement effect [22]. From the magnetic properties of TM doped tin oxide nanostructure, an important understanding has developed that lattice defects can contribute to magnetic signal [23,24].…”

Section: Introductionmentioning

confidence: 98%

Influence of Ti addition on the room temperature ferromagnetism of tin oxide (SnO2) nanocrystal

Sakthiraj¹,

Balachandrakumar²

2015

Journal of Magnetism and Magnetic Materials

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The effect of surfactants on the magnetic and optical properties of Co-doped SnO2 nanoparticles

Cited by 30 publications

References 27 publications

Structure dependent photoluminescence and magnetic properties of Co:ZnS nanostructures

Structure dependent photoluminescence and magnetic properties of Co:ZnS nanostructures

Microwave assisted synthesis of Sn(1−x)CoxO2 nanoparticles: effect of impurity phase formation on structural, optical and electrochemical properties

Influence of Ti addition on the room temperature ferromagnetism of tin oxide (SnO2) nanocrystal

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