Mn-doped Samples Research Articles

Effect of different type of dopants on the enhancement of KCl single crystal optical properties

As the most attractive phosphors, the enhancement of the optical properties of single crystalline alkali halides such as KCl using different types of dopants was approached. Pure and doped KCl single crystals were grown using Czochralski method. Different activators such as Ag, In, Mn, and Sn ions were employed to enhance the optical properties of grown KCl single crystals. The structure of the single crystalline samples was investigated through X-ray diffraction (XRD). The optical properties of the samples were studied by employing UV–vis spectroscopy, photoluminescence (PL) analysis and ion beam-induced luminescence (IBIL), to confirm the incorporation of dopants into the host lattice. In the PL spectra of the samples, two UV and near UV emission lines and one red emission line were detected in the PL spectrum of the pure sample at 357 nm, 420 nm and 697 nm respectively that have not been reported before. Dopants led to the change in the intensity and position of the peaks. The peaks at 420 nm and 697 nm in the doped samples were shifted towards shorter wavelengths and a 500 nm emission was emerged due to impurities. The IBIL analysis proposed the violet color center for the Sn and Mn doped samples. These peaks turn the KCl single crystals into attractive phosphors.

Structural, thermal and light emission properties of Eu, Sm, Dy, Er and Mn doped CaAl2O4 and SrAl2O4

1 mol% Re2O3/MnO – 99 mol% MAl2O4 (Re = Eu, Sm, Dy, Er and M = Ca and Sr) powder samples were prepared by solid state sintering in the temperature range of 1386–1450 °C and their structural, thermal and photoluminescence properties were compared. X-ray diffraction and Rietveld refinement studies of calcium aluminate samples confirm the formation of monoclinic CaAl2O4 along with a small concentration (1.9–4.6 wt %) of monoclinic CaAl4O7 while the strontium aluminate samples contain monoclinic SrAl2O4 and a small amount (0.7–3.5 wt %) of cubic Sr3Al2O6. The short-range structure of CaAl2O4 consists of CaO6, CaO9 and AlO4 structural units while that of SrAl2O4 contains SrO9 and AlO4 units. The Sr–O bond-lengths (2.32–3.58 Å) are longer than Ca–O bond-lengths (2.04–3.18 Å) and Al–O bond-lengths are of the range 1.35–2.12 Å. Differential scanning calorimetry studies reveal high thermal stability of calcium aluminates, while strontium aluminate samples show reversible monoclinic to - hexagonal structural phase transition at 688 °C during heating cycle. Raman spectra exhibit Al–O vibrational modes. Photoluminescence studies show reddish-orange emission in Eu, Sm and Mn-doped samples, Er doped samples show green emission and Dy-doped samples emit yellow-white light. Calcium aluminate samples show significantly higher luminescence intensity and quantum yield than strontium aluminates.

Local disorder and structure relation induced by magnetic exchange interactions in A2(Mo1−yMny)2O7 pyrochlores

We present an extended X-ray absorption fine structure study at the Mo K-edge of A2(Mo1−yMny)2O7 (A = Gd, Ho; y = 0.05 and 0.10) pyrochlores, as a function of temperature and composition, coupled to diffractometric and magnetic characterizations. Extending the study reported in our previous paper on the pristine A2Mo2O7 compounds to these Mo/Mn partially substituted samples, where we hypothesize a competition between double-exchange and superexchange couplings, we aim to check which structure parameters are related to the nature of the nearest-neighbor magnetic interactions, looking for the presence and evolution of order and structure anomalies. Two Ho samples Ho2(Mo1−yMny)2O7 (y = 0.05 and 0.10) keep the spin-glass nature of the parent compositions with a strong distortion of the MoO(1)6 octahedron and of the Mo‒Ho and Mo‒Mo second shell. On the other hand, two Gd2(Mo1−yMny)2O7 samples, ferromagnetic at low temperature in the undoped case, show the appearance on a local scale of a spin-glass transition mirrored by a quite high structure disorder and by a distortion coherent with a lattice frustration after Mn-doping. Therefore, the Gd and Ho Mn-doped samples display a similar frustrated behavior, differently from the corresponding undoped ones.

Effect of Mn-doping on the optical and electronics characteristics of cadmium sulfide photocatalyst prepared under different conditions

CdS and Cd0.95Mn0.05S were synthesized using a thermolysis procedure in the air and underflow of nitrogen. Rietveld analysis for X-ray diffraction data revealed that all samples have two phases (hexagonal wurtzite and cubic zinc blende). The effect of Mn doping and the preparation conditions on the phase percentages, the crystallite size, lattice parameters and vibrational bands were investigated in detail. The optical band gap of CdS reduced when formed in N2 compared with sample formed in air. Upon doping with Mn, the optical band gap of samples (in air or nitrogen) exhibited a redshift. Density function theory calculation (DFT) revealed a semiconductor feature with a direct band gap for all samples except Mn-doped CdS with cadmium deficiency; it has a half metallic nature. DFT calculations manifested that for the Mn-doped samples, the optical conductivity was enhanced in the visible range considering sulfur deficiency, while considering Cd deficiency the sample has an optical conductivity response only in the IR region. The calculations were performed to examine the influence of Mn doping on the structure, optical, magnetic and electronic characteristics of CdS (stoichiometric and non- stoichiometric).

Effect of Ce-Mn Codoping on the Structural, Morphological and Electrical Properties of the BaTiO3 Based Ceramics

Undoped, Cerium (Ce) doped, Manganese (Mn) doped and Ce-Mn co-doped Barium Titanate (BaTiO3) with the general formula Ba1-xCexMnyTi1-yO3 (where x = 0.00, 0.01, 0.02, 0.03, y = 0.00; x = 0.00, y =0.01, 0.02, 0.03; and x = y = 0.01, 0.02,0.03) were synthesized by solid-state reaction method and sintered at 1200 C for 4 hr with an aim to study their structural and electrical properties. The grain size of the samples has been estimated using the Scanning Electron Microscopy (SEM). The X-ray Diffraction (XRD) analysis indicates that the structure of the Ce-doped and Ce-Mn co-doped BaTiO3 is cubic. However, the undoped BaTiO3 and Mn-doped BaTiO3 confirmed the tetragonal-cubic mixed phases. With the change of doping concentrations, the positions of different peaks shifted slightly. The lattice parameter varied irregularly with increasing doping concentration because of Mn's changeable valency. EDX spectra confirmed the presence of Ba, Ti, Ce, and Mn contents in the co-doped samples with stoichiometric ratio. Crystallinity is observed to be clearly increased when Ce-Mn is co-doped in BaTiO3. J-V characteristic curves indicate transition from conducting to semiconducting nature for the doped and co-doped samples with the increase in temperature. The dielectric constant of the samples increases up to 4500 with the doping concentration. The higher values of dielectric constant are observed for the 2% Mn-doped and 1% Ce-Mn co-doped samples compared to the other undoped samples. For the undoped and Mn-doped samples, constant dielectric values increase with temperature but decrease for the Ce-doped and Ce-Mn co-doped samples. It is inferred that co-doping of BaTiO3 with Ce and Mn would be beneficial and economical for its applications.

Role of charge compensation mechanism and defect dipoles on properties of Mn doped BCT ceramics

Single-phase Mn doped Barium Calcium Titanate (BCT) (Ba0.80Ca0.20Ti1-xMnxO3; x = 0.000, 0.005, 0.010, 0.015 and 0.020) lead free ceramics have been prepared by conventional solid-state reaction method. XRD studies and Rietveld refinement confirmed the existence of tetragonal phase (P4mm) for all prepared ceramic compositions. The average grain size increased up to x = 0.005 and thereafter it decreased with increase in Mn content in BCT compositions. Analysis of temperature-dependent dielectric study revealed phase transformation from tetragonal to cubic phase and defect dipole induced anomaly in paraelectric region of temperature-dependent dielectric constant (εʹ–T) curve. Degree of diffusiveness increased with Mn doping in BCT ceramics as confirmed by evaluating diffused phase transition (DPT) parameters (γ and δc) by Power Law fitting and width of diffused phase transition (Dʹ) obtained from derivative of εʹ–T curve. Ferroelectric (P-E loops) study revealed that ceramic composition with x = 0.015 Mn content showed the highest remnant polarization (Pr) and maximum polarization (Pmax) of 14.10 μC/cm2 and 24.20 μC/cm2 respectively. Enhancement in energy storage properties with applied electric fields have been observed at room temperature. Maximum energy storage density Wrec ̴ 190.89 mJ/cm3 with an efficiency of 48.63% has been obtained for x = 0.015. A large piezoelectric charge coefficient (d33) of 460 pC/N has been obtained for x = 0.020. The room temperature magnetic measurements shows feeble ferromagnetism for Mn doped samples. These studies suggest the application of these ceramics for multilayer ceramic capacitors, energy storage, and high power applications.

Improvement in photovoltaic response of bismuth ferrite by tuning its ferroelectric and bandgap properties

Pristine and Mn-doped bismuth ferrite samples were prepared by sol–gel method. XRD patterns showed rhombohedral to orthorhombic phase transition with Mn doping in BiFeO3 sample. The surface morphology of the samples was carried out by scanning electron microscope which exhibited a decrease in grain size with Mn doping. Magnetic hysteresis curves exhibit that manganese doping induces modification in magnetic properties of bismuth ferrites. Significant modification was observed in dielectric with Mn doping and maximum value was recorded for BiFe0.8Mn0.20O3 sample. P–E hysteresis curves were recorded to evaluate the ferroelectric properties of all samples at room temperature. A significant improvement was observed in ferroelectric properties in doped samples. Bandgap values of BiFe1−xMnxO3 in UV–Vis region decreases with Mn doping and minimum for BiFe0.80Mn0.20O3 sample as evaluated from Tauc’s plots. I–V studies of pristine and Mn-doped samples were carried out with light and without light. Enhanced photocurrent density was observed in Mn-doped BFO samples. Hence, these modifications in ferroelectric and photovoltaic properties of BiFe1−xMnxO3 samples make bismuth ferrites a good candidate for photovoltaic applications.

Electronic structure of Mn-doped CaCu3Ti4O12: An XPS, ESR and NEXAFS study

Mn-doped CCTO samples were synthesized using standard ceramic technology. Two series of samples of the composition CaCu3Ti4-4xMn4xO12-δ and CaCu3-3xMn3xTi4O12+δ (0.005 ≤ х≤0.06) have been investigated. According to XRD data, the samples contain copper oxide (less than 1 mol %), the largest amount of which is in CaCu3Ti4-4xMn4xO12-δ. According to XPS and NEXAFS spectroscopy, a complex mixture of Mn (II), Mn (III), Mn (IV) ions is recorded in both series of samples. In both series, Mn (II) ions are reliably determined, in large amounts in CaCu3-3xMn3xTi4O12+δ. In the ESR spectra of both series of Mn-doped CCTO samples, the exchange-narrowed line (g~2.149 at RT) broadens and rapidly degrades as the content of the doping impurity increases; a broad signal appears in the spectrum with a center in the region g = 2. In the spectra of the CaCu3Ti4-4xMn4xO12-δ series, starting from x = 0.02, a sextet of relatively narrow lines appears in the g = 2 region of the hyperfine (HF). With an increase in the Mn content from x = 0.02 to 0.06, the sextet intensity approximately doubles. The observed sextet of isolated Mn2+ ions most likely belongs to Mn2+ ions, which replace Ca2+ ions in the unit cell of perovskite (CaTiO3).

Structural, optical, and magnetic properties of Mn-doped ZnS nanoparticles

Undoped and Mn-doped ZnS nanoparticles were successfully prepared through a coprecipitation method at low-temperature processing. The X-ray diffraction patterns reveal that the undoped and Mn-doped ZnS nanoparticles have polycrystalline nature with cubic ZnS structure. Furthermore, the lattice constant of the ZnS nanoparticles increases with an increase in the Mn doping concentration. Transmission electron microscope images demonstrated the as-synthesized nanoparticles have particle size ranging from 3 to 5 nm with spherical-shaped particles. Optical band gap values were found to increase from 3.32 to 3.50 eV with the increasing Mn doping concentration. The magnetic properties of undoped and Mn-doped ZnS samples were studied using the vibrating sample magnetometer at room temperature. The synthesized undoped ZnS nanoparticles exhibit ferromagnetism, while Mn-doped ZnS nanoparticles showed paramagnetism at room temperature. Moreover, the saturation magnetization of Mn-doped ZnS samples is higher compared to undoped ZnS. The present synthesis technique to produce high-crystalline quality Mn-doped ZnS nanoparticles and prepared nanoparticles has great potential applications in spintronic and optoelectronic devices.

Photoluminescence, Optical Energy Gap and Electrical properties of Mn-Doped ZnO Nanorods Synthesized by CBD Method

In this work, un-doped and Manganese doped Zinc Oxide Nanorods (NRs) thin films were grown on the glass substrates using chemical bath deposition method (CBD) at 80 °C temperature. The effect of Mn content (0, 2 and 4%) on the structural, morphology, optical and photoluminescence characteristics of ZnO NRs films was investigated. The XRD patterns of un-doped and Mn-doped ZnO NRs demonstrate sharp and strong peaks together with high crystalline structure. The FESEM images showed that the nanorods of ZnO and Mn:ZnO were well-aligned and distributed throughout the films. The absorption edge was observed to be blue-shifted and the optical energy gap was found to be widening from (3.21, to 3.31) eV with increased Mn content. The photoluminescence spectrum (PL) of Mn-doped samples was examined, at room temperature, and revealed of highly UV emission, whereas the green-yellow wavelengths emissions were enhanced with increased Mn content. Current-voltage (I-V) characteristics showed that the photocurrents of all prepared samples are enhanced and the Mn doped samples showed a good response, under UV light.

Synthesis and luminescent properties of Mn-doped alpha-tricalcium phosphate

In this work, a series of Mn2+-doped α-tricalcium phosphate (α-TCP) powders was synthesized by wet co-precipitation method followed by high-temperature annealing and thermal quenching. It was shown that Mn2+-doped α-TCP polymorph can be successfully synthesized with a doping level up to 1 mol%. All Mn-doped samples exhibited a broadband emission in the range from 525 to 825 nm with a maximum centered at around 630 nm. The highest emission intensity was observed for the sample with the highest content of Mn. The crystal structure and purity were evaluated by powder X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and electron paramagnetic resonance (EPR) spectroscopies. Scanning electron microscopy (SEM) was used to investigate the morphological features of the synthesized products. Optical properties were investigated by means of photoluminescence measurements. Excitation spectra, emission spectra and decay curves of the samples were studied. Temperature-dependent photoluminescence measurements were performed as well.

Enhanced sunlight photodegradation activity of methylene blue using Mn doped SnO2 loaded on corn cob activated carbon

In this work, Mn doped SnO2 loaded with a (0.5 ​g) corn cob activated carbon (Mn: SnO2/CCAC) are successfully synthesized by chemical precipitation method and its photocatalytic performance was estimated by photodegradation of methylene blue (MB) under sunlight irradiation. The materials were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–Vis diffuse reflectance spectroscopy (UV–Vis, DRS), photoluminescence (PL), fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM) with energy dispersive X-ray analysis (EDAX), Brunauer-Emmett-Teller (BET) surface area and electrochemical impedance spectroscopy (EIS) analysis. The XRD results confirmed the rutile tetragonal crystalline structure and average crystalline size is decreased (13.79 ​nm) upon Mn doping and CCAC loading samples. The band gap value (Mn: SnO2/CCAC) is decreased (3.49 ​eV) compared to pure SnO2 and Mn doped SnO2 samples. Further, reduced PL emission intensity of Mn: SnO2/CCAC and its reduced value of impedance from EIS analysis and enhanced separation of the photogenerated electron-hole pairs, supports the enhanced photodegradation efficiency. As a result, the optimum Mn (0.10 ​M) doped SnO2/CCAC of the removal efficiency (97.76%) of MB dye reveals both improves photocatalysts (Mn-doped SnO2) and adsorption (CCAC) under sunlight within 120 ​min. The mechanism for the enhancement of photocatalytic activity under sunlight irradiation is also proposed.

Effect of Mn doping on magnetodielectric properties of polycrystalline BiFeO3 ceramics

This report reveals the room temperature magnetodielectric effect of polycrystalline BiFe0.8Mn0.2O3 ceramics. Structural analysis shows that the additional phases of BiFe0.8Mn0.2O3 are suppressed and compared with bare BiFeO3. The difference in dissociation energies between Mn–O and Bi–O bonds traps the motion of oxygen ions and reduces the grain size of BiFe0.8Mn0.2O3. Mn-doped BiFeO3 samples exhibit a weak ferromagnetic response because of the effect of Mn in the Fe site which uncurls the spiral spin ordering by altering the canting angle. Additionally, Bi vacancies give rise to charge compensating oxidation of Mn3+/ Mn4+ which causes the ferromagnetic weaker. BiFe0.8Mn0.2O3 shows an improved dielectric permittivity compared to BiFe0.9Mn0.1O3 and BiFeO3 respectively. The magnetodielectric coupling coefficient of BiFe0.8Mn0.2O3 ceramic at 6 kOe and 1 MHz is determined to be 4.64%.

Evolution of Crystal Structure and Magnetic Properties of Y2Zr2−xMnxO7 (x = 0.0, 0.1, 0.2) Family of Pyrochlore Oxides

The present article reviews the structural and magnetic properties of Y2Zr2−xMnxO7 compounds with respect to the extent of Mn doping. All the samples are single phase and crystallize in the cubic system with Fd-3m space group. The stability of the pyrochlore structure was established by Rietveld structural refinements. The lattice parameter and cell volume decrease with Mn substitution because of the smaller ionic radius of Mn4+ than Zr4+. The zero field-cooled (ZFC) and field-cooled (FC) curves for Mn-doped samples diverge at low temperature which is possibly due to spin-glass transition. Both the Mn-doped phases exhibit anti-ferromagnetic behavior, which could be due to the presence of super-exchange (SE) Mn4+–O2−–Mn4+ interactions. Moreover, small magnetic hysteresis loops are observed for the Mn-doped phases suggesting the presence of weak ferromagnetic interactions.

Investigation of Magnetic and Optical Properties of Mn-Doped SnO<sub>2</sub> at Different Annealing Temperatures

In this paper, a systematic investigation has been done to study the effect of variation in annealing temperature on magnetic and optical properties of Mn-doped SnO2. Co-precipitation technique has been used to synthesize Sn1-xMnxO2 samples with low Mn concentration (2 %). Pristine SnO2 is sintered at 350 oC. Mn-doped SnO2 samples are sintered at 350, 450, 550 and 650 oC. The structures of tetragonal rutile of SnO2 and Mn-doped SnO2 have been confirmed by the XRD pattern. Typical ferromagnetic ordering has been observed for Mn-doped SnO2 samples annealed at different temperatures. However, on increasing the annealing temperature saturation magnetization as well as the coercive field decreases, indicating a crucial phase transformation from ferromagnetism to paramagnetism. UV-Vis spectroscopy shows increase in absorbance and a slight shift in the absorption edge with Mn-doping at increasing annealing temperature indicating shifting of absorption peak towards higher wavelength. Tauc’s plot has been used to find the optical band gap (Eg).

Hole-mediated ferromagnetism in GaN doped with Cu and Mn

We present a cathodoluminescence (CL) and superconducting quantum interference device (SQUID) magnetometry study of the generation of ferromagnetism (FM) in GaN doped with non-magnetic (copper) and magnetic (manganese) impurities. Our results suggest that p–d hybridization between Cu and N ions promotes FM in GaN:Cu, and that an exchange interaction between the Cu2+ (d9) orbitals and the t2g anti-bonding orbitals of Mn2+ ions generates FM in GaN:Cu and GaN:Mn. Besides that, the exchange interaction is mediated by holes, created by the acceptor nature of the impurities Cu2+ and Mn2+, and of the point-defects-type gallium vacancies (VGa) present in samples. For this study, we synthesized undoped GaN, GaN:Cu, and GaN:Mn samples by thermal evaporation onto Ni0.8Cr0.2/Si substrates in a horizontal furnace operated at low vacuum. Energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) measurements confirmed that the obtained samples consisted of GaN without residual oxide phases. XPS measurements also revealed the coexistence of Cu+ and Cu2+ ions in the GaN:Cu sample, and Mn2+ in the GaN:Mn sample. CL spectra from Cu and Mn-doped GaN samples showed that doping generates a relative intensity enhancement of two bands centered at 2.60 and 3.00 eV, associated with the formation of VGa in GaN. Magnetization–applied field (M–H) curves of the GaN, GaN:Cu, and GaN:Mn samples revealed a FM behavior at room temperature.

Mn-doped Cu3Se2 nanosheets: Impact of physical characteristics on the photovoltaic performance

The un- and manganese (Mn)-doped Cu3Se2 nanosheets were prepared by the electrodeposition method. X-ray diffraction (XRD) patterns revealed that polycrystalline Cu3Se2 nanostructures were at the tetragonal phase. Field emission scanning electron microscopy (FESEM) images showed that all samples had a sheet-like structure. The photoluminescence (PL) spectra showed that the un- and Mn-doped Cu3Se2 nanosheets had three emission bands in violet, green, and red regions. The absorption spectra also demonstrated that the band gap energy of the Mn-doped samples was increased relative to the un-doped sample. Solar cell evaluation showed that addition of Mn dopant was effective on increasing the solar cell efficiency. Further investigations indicated that these changes were close to different physical properties such as increase in the surface-to-volume ratio, absorption intensity, and carrier concentration with the lowest value of strain.

Structural, optical, and electronic properties of non-stoichiometric nano-ZnS1−x: Mnx

Non-stoichiometric ZnS1−x:Mnx nanomaterials were prepared using a thermolysis procedure by decreasing the stoichiometric amount of thiourea relative to the amount of zinc acetate as starting precursors: Zn(Ac)/(1−x) thiourea in the presence of (x) manganese acetate (x = 0, 0.01, 0.03, 0.05, and 0.1). Rietveld X-ray diffraction analysis was used to examine the structural modification in the ZnS lattice induced by sulfur deficiency and Mn2+ incorporation. The samples with x ≤ 0.01 exhibited a single ZnS zincblende phase, while other samples, x ≥ 0.02, have two phases ZnS and ZnO with different percentages. The lattice parameter of the system is governed by the Mn and S amounts in the matrix. A high-resolution transmission electron microscope established the quantum dot nature of the system. Fourier-transform infrared technique confirmed the presence of ZnS and ZnO phases in higher Mn-doped ZnS samples. The bandgap obtained from UV–vis analysis showed non-monotonic dependence on Mn content; it initially decreased and then increased to form a bandgap “bowing.” Photoluminescence analysis revealed that the emission colors depended on the amount of Mn doping in the matrix. The PL intensity raised for all Mn-doped samples as compared with the pristine sample reached its maximum value for the 3% and 5% Mn samples. The PL exhibited a red shift for the high dopant amount of Mn. Density function theory calculation was used to explore the electronic and optical characteristics of pure phases in ZnS1−xMnx system.

Experimental and DFT investigation of electronic structure and ferromagnetic stable state in pristine and Mn: SnO2 NPs

We have investigated the electronic and magnetic properties of pristine and Mn (6%) doped SnO2 nanoparticles (NPs). Rietveld refinement of XRD affirmed the single-phase rutile structure with P42/mnm space group. The magnetic measurements at RT elucidated that pristine SnO2 is nonmagnetic, whereas the Mn-doped sample has ferromagnetic (FM) and simultaneously paramagnetic (PM) independent phases. For tracing the possible sources of the FM signal, density functional theory (DFT) calculations at generalized gradients approximation (GGA) were employed. DFT findings predicted that the presence of Ov solely without Mn dopant ions is an insufficient condition to produce stable magnetic order in pristine SnO2. Thus, the d0 ferromagnetic in stoichiometric SnO2 can be excluded. Furthermore, Mn (6.25%): SnO2 system (Sn15MnO32) without OV is nonmagnetic, but with the presence of Ov the system exhibited FM stable state. Our study demonstrated that the Mn 3d and O 2p electronic states showed a strong hybridization at Fermi level (EF) and the local magnetic moment is found to be arising from spontaneous spin-polarized of Mn 3d states near Fermi EF with 3.2 μB/Mn moments. The most sensible percolation mechanism behind the spin-split impurity band and the FM response has been discussed.

Effect of Co and Mn doping on the morphological, optical and magnetic properties of CuO nanostructures

Copper oxide (CuO) is an exciting semiconducting material with interesting structural and optical properties. Transition metal doped-CuO nanostructures have great potential to use in memory device applications. In the present work, we describe in detail, the synthesis of pure CuO, cobalt (Co) and manganese (Mn) doped CuO via low temperature co-precipitation method. Various techniques like; X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Superconducting Quantum Interference Device (SQUID) magnetometer have been utilized to characterize the synthesized nanoparticles. XRD data exhibits a pure monoclinic phase of CuO for all synthesized samples. Surface morphology obtained from FE-SEM clearly shows the presence of cluster-like structure of grains. The magnetic investigations suggest that pure CuO nanoparticles exhibit the superparamagnetic state, which further transforms to antiferromagnetic state with Co doping. However, a peak of sharp intensity (maxima) at T = Tf in ZFC curve in Mn-doped sample gives the evidence of spin glass (SG) behavior.