Transforming from paramagnetism to room temperature ferromagnetism in CuO by ball milling

Gao, Daqiang; Zuo, Yi; Zhang, Jing; Yang, Guijin; Zhu, Zhonghua; Qi, Jing; Si, Mingsu; Xue, Desheng

doi:10.1063/1.3670360

Cited by 21 publications

(8 citation statements)

References 25 publications

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“…Cu valences at the CuO surface were indeed a mixture of +1 and +2 valence states [40]. The ferromagnetism of both CuO and Cu 2 O nanoparticles was owing to a close association with the valence charged oxygen vacancies (Cu 1+ -V o ) in both oxides, according to literature [41] [42][43][44]. Indeed, the interface of CuO/Cu 2 O nanocomposites consisted of three components containing Cu 1+ ions, Cu 2+ ions, and V o as oxygen vacancy.…”

Section: Discussionmentioning

confidence: 76%

One Pot Synthesis, Surface and Magnetic Properties of Cu2O/Cu and Cu2O/CuO Nanocomposites

et al. 2021

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A series of copper-based systems containing two different nanocomposites (Cu2O/CuO and Cu2O/Cu) was synthesized by the egg white assisted auto-combustion route. This method was distinguished by the simplicity of its steps, low cost, one-pot synthesis process at low temperature and, short time. The characterization of the as prepared nanocomposites was carried out by using X-ray diffraction (XRD), Fourier-transform infrared (FTIR), Scanning electron microscope (SEM) and transmission electron micrograph (TEM), Energy dispersive spectrometry (EDS) techniques. Surface and magnetic properties of the obtained systems were determined by using N2 adsorption/desorption isotherms at 77 K and the vibrating sample magnetometer (VSM) technique. XRD results confirmed the formation of Cu2O/CuO and Cu2O/Cu nanocomposites with different ratios of well crystalline CuO, Cu2O, and Cu phases. FTIR results of the combusted product displays the presence of both CuO and Cu2O, respectively. SEM/EDS and TEM results confirm the formation of a porous nanocomposite containing Cu, O, and C elements. The change in concentration of the oxygen vacancies at the surface or interface of both Cu2O/CuO and Cu2O/Cu nanoparticles resulted in different changes in their magnetization. Based on this study, it is possible to obtain nanocomposite-based copper with multiple valances by a simple and inexpensive route which can be suitable for the fabrication of different transition metal composites.

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Section: Discussionmentioning

confidence: 76%

One Pot Synthesis, Surface and Magnetic Properties of Cu2O/Cu and Cu2O/CuO Nanocomposites

et al. 2021

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“…[30,31] The higher bandgap energy permits to absorb a photon with lesser energy in the visible region. [46] The valence band tail may extend above the valence band maxima or the up lifting of the valence band maxima as shown in Figure S4, which might be responsible for the optical absorption onset. [47] The theoretical studies.…”

Section: Resultsmentioning

confidence: 99%

Lithium‐Doped CuO Nanosheets: Structural Transformation, Optical, and Electrical Characteristics with Enhanced Photocatalytic and Solar Cell Performance

Siddiqui

Qureshi

Haque

2020

Energy & Environ Materials

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Energy and environmental stuff are two of the main worries for humanity, and nanoscience plays a key role in providing the solution. Huge nano‐research activities have attracted lot of attention in the current scenario. However, designing the material with enhanced optoelectronic properties remains the foremost challenge. In the present work, the Li doped CuO nanosheets are synthesized by the chemical route and examined in photovoltaics and environmental remediation applications. The crystallographic and optical study reveals that crystallite size and bandgap decrease with an increase in lithium‐doping concentration up to 5 mole % and beyond that a reverse trend is observed. Additionally, impedance study has shown the significant contribution of lithium‐ions to the total capacitance and resistivity. Further, the photoactivity of Cu1−xLixO nanosheets (optimum concentration of Cu1−xLixO NSs (x = 0.05)) is projected to the degradation of methylene blue (MB) and used to fabricate bulk heterojunction solar cell together with P3HT and PCBM blend, respectively. The ITO/PEDOT:PSS/P3HT:PC70BM:Cu1−xLixO (x = 0.05)/LiF/Al solar cell realized higher power‐conversion efficiency η ˜ 3.91 than their corresponding pristine device η ˜ 2.98 with enhanced photocurrent density from 9.026 to 11.56 mA cm−2. The proliferation in photocatalysts and solar cells efficiency of Cu1−xLixO (x = 0.05) is mainly attributed to the higher light absorption and lesser electron‐hole recombination. The approach for the synthesis of Cu1−xLixO NSs as potential donor material and device prototypes fabricated is completely safe and cost‐effective.

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“…Previous results on milled CuO showed magnetic hysteresis at RT 10,11,20,21 and loop shifts that have been interpreted as EB effects. 10,11,14 In this work, we examine and compare the structural, microstructural, and magnetic properties of CuO nanostructures produced by controlled HEBM.…”

Section: Introductionmentioning

confidence: 93%

Magnetic hardness features and loop shift in nanostructured CuO

Bianchi

Stewart

Zysler

et al. 2012

Journal of Applied Physics

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Enhanced magnetic behavior, exchange bias effect, and dielectric property of BiFeO3 incorporated in (BiFeO3)0.50 (Co0.4Zn0.4Cu0.2 Fe2O4)0.5 nanocomposite AIP Advances 4, 037112 (2014); 10.1063/1.4869077 Core/shell magnetism in NiO nanoparticles J. Appl. Phys. 114, 083906 (2013); 10.1063/1.4819807 Structural and room-temperature ferromagnetic properties of Fe-doped CuO nanocrystalsNanostructures of cupric oxide (CuO) obtained by ball milling show drastic changes in its magnetic behavior that cannot be only associated to a size effect. While sample of average size D ¼ 29 nm presents a magnetic behavior that resembles that of bulk material with a N eel temperature of 195 K, another sample with D ¼ 24 nm displays a departure from the magnetic features typical of bulk CuO and has magnetic hardness characteristics at low temperatures. Both samples show irreversibility above room temperature and shifts in their hysteresis loops along magnetization and field axis when field cooled in a H FC ¼ 50 kOe to 10 K. At this temperature, an apparent exchange bias like field, "H EB ", 0.17 and 1.06 kOe were estimated for 29 and 24 nm CuO samples, respectively. Magnetic behavior differences observed in samples subjected to distinct milling times are explained as due to a proposed model for milled CuO consisting of a multilayer configuration where interfaces comprise uneven structural disorder and oxygen deficiencies, which generate a peculiar antiferromagnetic/ferromagnetic interface configuration. V C 2012 American Institute of Physics. [http://dx.

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Transforming from paramagnetism to room temperature ferromagnetism in CuO by ball milling

Cited by 21 publications

References 25 publications

One Pot Synthesis, Surface and Magnetic Properties of Cu2O/Cu and Cu2O/CuO Nanocomposites

One Pot Synthesis, Surface and Magnetic Properties of Cu2O/Cu and Cu2O/CuO Nanocomposites

Lithium‐Doped CuO Nanosheets: Structural Transformation, Optical, and Electrical Characteristics with Enhanced Photocatalytic and Solar Cell Performance

Magnetic hardness features and loop shift in nanostructured CuO

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