Single Monoclinic Phase Research Articles

Microwave dielectric properties and bond characteristics of glass-free low permittivity LiVO3 ULTCC ceramics

The LiVO3 ultra-low temperature cofired ceramic (ULTCC) was synthesized by the solid-state chemical method and its crystal structure, sintering behavior, and microwave dielectric performances were systematically studied by X-ray diffractometer (XRD) and Scanning electron microscope (SEM). XRD showed that LiVO3 were pure monoclinic single phase with a space group of C2/c. Furthermore, the best microwave dielectric properties Q × f = 16,900 ± 720 GHz, εr = 8.78 ± 0.06, and τf = − 117 ± 2.3 ppm/°C could be obtained when LiVO3 sintered at optimal sintering condition 520 °C/8 h affirmed by SEM. The microwave dielectric properties were also deeply investigated utilizing the P–V–L chemical bond theory. The microwave dielectric performances of LiVO3 had a great closer relationship with the V(1)–O bonds explained by analysis data. The low permittivity LiVO3 with attractive features highlighted it to be a good candidate for ULTCC applications.

Investigation of the correlation between structure and microwave dielectric properties of ZnV2O6 ceramic using P-V-L bond theory

Novel ZnV2O6 ceramic was synthesized using the solid-state process. A single monoclinic crystalline phase with a space group C2/m was detected at the sintering temperatures ranging from 580 to 670 °C. The correlations between the chemical bond parameters and microwave dielectric properties were analyzed using the P-V-L bond theory. The full width at half maximum (FWHM) of the most intense Raman peak at 914 cm–1 is inversely proportional to the Q×f value. The ZnV2O6 ceramic can be well-sintered at 640 °C to exhibit an excellent combination of microwave dielectric properties (εr =14.6, Q×f =46,000 GHz and τf =–42 ppm/°C). Additionally, the specimen sintered at 580 °C (εr =13.2, Q×f =28,000 GHz and τf =–5.2 ppm/°C) is also suggested for highly thermal-stable applications. Both samples can be used as ultra-low-temperature co-fired ceramics (ULTCCs) for high-frequency applications.

Role of walnut ac-based Si-ZrO2: investigation of rietveld refinement, optical and electrochemical properties for pseudo-capacitor applications

In this current project, silicon substituted zirconia matrixes with the general formula of SixZr(1-x)O2 at x = 0.1–0.6, step size 0.1 have been fabricated through powder metallurgy route. All the samples have been sintered at 1200 °C for four hours in an air furnace. The structural, refinement, 3-dimensional view, functional groups, optical and electrochemical properties have been investigated using x-ray diffractometer (XRD), Rietveld refinement, diamond and Vista software, Fourier Infrared spectroscopy (FTIR), Diffuse reflectance spectroscopy (DRS), and Cyclic voltametric (CV) respectively. The XRD and Rietveld refinement exhibit sharp peaks which are matched with JCPD card no 07-0343, the single monoclinic phase is achieved in all samples. The goodness of fit clarifies the proper growth of the crystal. Furthermore, the theoretical evaluation is cross-matched with refinement data. The ATR-FTIR analysis indicates the characteristic bands of monoclinic zirconia. Due to the creation of active sites on the electrode surface, the average surface area of these oxides as determined by SEM is in the range of 58–63 m2 g−1. The lowest band gap and higher ionic conductivity values reveal the higher compatibility rate of charge carriers. The maximum specific capacitance (Csp) obtained from CV, GCD, and EIS analyses using walnut shell a.c is 903.1 A g−1, which are excellent materials for pseudocapacitive electrodes.

Photoluminescence and EPR spectroscopic studies on narrowband ultraviolet-B (NB-UVB) emitting trivalent gadolinium-doped CaAl4O7 material for phototherapy lamps

Using the sol-gel process, a series of Gd3+ doped CaAl4O7 samples were fabricated. Their crystal characteristics, surface morphologies, and spectral characteristics were analyzed using X-ray powder diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. XRD analysis reveals that the prepared phosphor exhibits a single monoclinic phase, indicating a well-defined crystal lattice. Under the excitation wavelength of 272 nm, weak and strong emission peaks were identified at 307 nm and 314 nm, which correspond to 6P5/2 → 8S7/2 and 6P7/2 → 8S7/2 transitions, respectively. A strong electron paramagnetic resonance (EPR) signal of the CaAl4O7:Gd3+ phosphor was observed at geff ∼ 2.16 and 1.94 along with several weak EPR signals that were observed at geff ∼ 14.8, 9.7, 5.6, 4.8, 3.7, 3.16, 2.7 and 1.5. The intense narrowband at 314 nm in the ultraviolet-B region makes prepared phosphor a promising candidate for phototherapy lamp applications. This study presents a comprehensive investigation of the Gd3+ doped CaAl4O7 phosphor, addressing its structural, and luminescent properties, which contributes to a deeper understanding of this material for various technological applications.

Synthesis of Binary Metal Doped CuO Nanoarchitecture for Congo red dye Removal: Synergistic Effects of Adsorption and Mineralization Techniques

Herein, a microwave-assisted fabrication technique has been practiced for the generation of pristine CuO and Cd/Zn co-doped CuO (Cu0.94Cd0.03Zn0.03O) nanopowders with the identical weight ratio of cadmium and zinc metals. The structure, chemical nature, shape, and optical response of CuO and Cu0.94Cd0.03Zn0.03O were assessed by PXRD, FESEM, FTIR, and UV–vis analytical techniques. PXRD results affirmed that CuO and Cu0.94Cd0.03Zn0.03O have developed in a single monoclinic phase; other extra phases are absent. The crystallite sizes of CuO and Cu0.94Cd0.03Zn0.03O were identified as 18.5 nm and 14.39 nm. The FESEM image of the Cu0.94Cd0.03Zn0.03O sample demonstrated a nanosheet-like morphology that was developed after the co-doping of Zn and Cd metal ions. FTIR graphs established the occurrence of Cu–O main bonds in both fabricated nanopowders. The UV–vis examination demonstrated that Cd and Zn co-doping has substantially reduced the energy gap of pristine CuO from 2.0 eV to 1.54 eV. This massive reduction in CuO bandgap assists it in catching extra photons to stimulate valence-band electrons and hence boosts the activity of the catalyst under sunlight irradiations. Moreover, including Cd and Zn has also effectively hindered the e−/h+ recombination in CuO throughout the photocatalysis process. The photocatalytic activities of pristine CuO and Cu0.94Cd0.03Zn0.03O nanosheets were probed against Congo-red (CR) pollutants under sunlight irradiations. The mineralization efficiency was detected as maximum (∼87.88%) for Cu0.94Cd0.03Zn0.03O nanosheets in contrast to pristine CuO nanostructures. Cu0.94Cd0.03Zn0.03O nanosheets, due to their astonishing properties, could be an economical alternative in creating intelligent strategies for mineralizing organic pollutants in industrial effluents.

Crystal growth and phase formation of high‐entropy rare‐earth monoclinic aluminates

AbstractFor the first time, high‐entropy rare‐earth monoclinic aluminate crystals were grown via directional solidification using the micro‐pulling‐down method. Five high‐entropy compositions were formulated with a general formula RE4Al2O9, where RE is an equiatomic mixture of five rare‐earth elements. The rare‐earth elements included were Lu, Yb, Er, Y, Ho, Dy, Tb, Gd, Eu, Sm, Nd, and La. High‐temperature powder X‐ray diffraction and Rietveld structure refinement indicated that all crystals were a single monoclinic phase and that rare‐earth average ionic radius did not affect phase purity. At room temperature, the refined lattice parameters increased consistently with increasing average ionic radii of the five compositions. One of the crystals had a typical high‐temperature phase transition of single‐RE RE4Al2O9 in the range of 1100–1150°C, which consisted of a lattice contraction upon heating. Differential scanning calorimetry indicated a thermal event corresponding to that phase transition. Electron probe microanalysis revealed Al‐rich inclusions on the surface of the crystals. Crystals containing Tb had dark surface features that became lighter after annealing in a reducing atmosphere, which indicated that Tb4+ may be responsible for the dark features.

Impact of Ti doping and annealing temperature on structural and opto-magnetic properties of tungsten oxide (WO3)

ABSTRACT Pure and Ti-doped WO3 nano systems synthesized by the solid state reaction method and annealed at different temperatures, were studied for changes in structural, optical and magnetic properties. X-ray diffraction, Raman, UV–Vis, photoluminescence spectroscopy, vibrating sample magnetometer (VSM) techniques were employed for structural, optical and magnetic characterization to study the modification of the electronic structure and disorder developed in the samples. Inclusion of Ti ions leads to degradation in the crystallinity of the monoclinic single phase system with an increase in the content of the dopant ions, whereas increased annealing temperature enhances crystallinity. A red shift in the optical band gap indicates the production of defect states. As the annealing temperature is raised, the amount of visible photoluminescence (PL) emissions caused by oxygen vacancies decreases. Magnetic experiments demonstrate the ferromagnetic properties of the prepared samples, which exhibit a decrease with Ti doping and an increase in annealing temperature.

Structural, mechanical and thermal properties of cubic bixbyite-structured high-entropy oxides

Cubic bixbyite-structured high-entropy oxides (HEOs) are regarded as potential candidates in high temperature thermal insulation field in recent years. However, their relevant properties are still needed to be explored for possible applications. In this work, twelve new high-entropy oxides (HEO1-12) of (5Re0.2)2O3 (Re represents five elements selected from Ce, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb) are prepared by solution combustion synthesis method combined with conventional sintering. Except HEO10 with a single monoclinic phase, other samples have a single bixbyite phase. The average grain size of bixbyite-structured samples is within 0.76 ∼ 4.96 μm. Then, the samples of HEO4, 5, 7–9 are chosen to study their mechanical and thermal properties. Their nano-modulus, nano-hardness, fracture toughness KIC, brittleness M and surface fracture energy are in the range of 152.42 ∼ 237.33 GPa, 9.22 ∼ 12.65 GPa, 1.77 ∼ 2.51 MPa·m1/2, 2.35 ∼ 3.09 μm−1/2 and 9.00 ∼ 22.49 J m−2, respectively. HEO4, i.e., (Ce0.2Nd0.2Sm0.2Dy0.2Gd0.2)2O3, exhibits higher KIC (1.92 MPa·m1/2) and lower M (2.71 μm−1/2) than another reported cubic bixbyite-structured HEO of (Eu0.2Er0.2Lu0.2Y0.2Yb0.2)2O3. Among the five samples, HEO4 has the lowest thermal conductivity κ (1.88 ∼ 2.55 W·m−1·K−1 in 25 ∼ 500 °C), which is much lower than bixbyite-structured Y2O3. In addition, HEO4 possesses a lower oxygen diffusion compared with 8YSZ in 600 ∼ 700 °C, which endows it the better oxygen barrier property. To sum up, HEO4 could be a promising candidate for high temperature thermal insulation applications due to its excellent comprehensive properties.

Room Temperature Detection of Chlorpyrifos Using Thermally Oxidized Manganese and Copper Thin Films

The usage of pesticides has increased rapidly over the past three decades to boost crop production and meet the global food demand. According to UN FAO, about 66% of the countries have reported an average increase in pesticide consumption of about 1.85 kg hectare−1 between 1990 and 2019. Chlorpyrifos is a widely used but hazardous pesticide, popular for domestic and agricultural applications. Real-time monitoring of Chlorpyrifos is necessary for its safe application due to its toxicity, even at the residue level. In this work, an attempt has been carried out to detect chlorpyrifos at room temperature using thermally oxidized manganese and copper thin films. Thermal oxidation of thin films has been carried out under air ambient at different temperatures ranging from 400 °C to 550 °C for manganese and 500 °C to 800 °C for copper thin films. Morphological investigation depicts nanobar-like morphology and irregular-sized clusters for various oxidation temperatures of manganese oxide thin films, and granular-like morphology with an increase in grain size has been observed for increasing oxidation temperature. Structural investigation using the XRD technique depicts the evolution of various phases of manganese oxide thin film and a single monoclinic phase for copper oxide thin film. Further, the RMS roughness of the manganese and copper film was found to vary differently with the rise in oxidation temperature. Copper oxide thin films have shown higher chlorpyrifos sensing response with sensitivity than thermally oxidized manganese thin films better sensing response towards chlorpyrifos. The sensitivity at room temperature is found to be around 30 and 250 for manganese oxide and copper oxide thin films, respectively.

Enhanced Photocatalytic Performance of Visible-Light-Driven BiVO4 Nanoparticles through W and Mo Substituting

Bismuth vanadate (BiVO4), W-doped BiVO4 (BiVO4:W), and Mo-doped BiVO4 (BiVO4:Mo) nanoparticles were synthesized at pH = 4 using a green hydrothermal method. The effects of 2 at% W or Mo doping on the microstructural and optical characteristics of as-prepared BiVO4 nanoparticles and the effect of combining particle morphology modification and impurity dopant incorporation on the visible-light-derived photocatalytic degradation of dilute Rhodamine B (RhB) solution are studied. XRD examination revealed that these obtained BiVO4-based nanoparticles had a highly crystalline and single monoclinic phase. SEM and TEM observations showed that impurity doping could modify the surface morphology, change the particle shape, and reduce the particle diameter to enlarge their specific surface area, increasing the reactive sites of the photocatalytic process. XPS and FL measurements indicated that W- and Mo-doped nanoparticles possessed higher concentrations of oxygen vacancies, which could promote the n-type semiconductor property. It was found that the BiVO4:W and BiVO4:Mo powder samples exhibited better photocatalytic activity for efficient RhB removal than that shown by pristine BiVO4 powder samples under visible light illumination. That feature can be ascribed to the larger surface area and improved concentration of photogenerated charge carriers of the former.

Sol-gel produced Zn2V2O7 phosphors' improved luminous properties: The role of thermal treatment

Zn2V2O7 phosphor was made using a sol-gel technique and then annealed at temperatures ranging from 700 to 850 °C. The x-ray diffraction (XRD) results revealed that Zn2V2O7 exhibits a single monoclinic phase. The width at half-maximum of the (022) XRD peak shrank overall resulting in improved crystallinity of the Zn2V2O7 phosphors with higher annealing temperatures. Because of the good crystallinity of Zn2V2O7, scanning electron microscopy (SEM) indicates that grain size increases as the annealing temperature rises. When the temperature was raised from 35 °C to 500 °C, TGA findings revealed a total weight loss of approximately 65%. The photoluminescence emission spectra of annealed Zn2V2O7 powders revealed a wide green-yellowish emission in the range of 400 nm–800 nm. As the annealing temperature was raised, the crystallinity improved, resulting in an increase in PL intensity. The peak of the PL emission shifts from green to yellow emission.

Facile Phase Control and Photocatalytic Performance of BiVO4 Crystals for Methylene Blue Degradation.

Emerging contaminants, which mainly exist as organic pollutants and pose adverse biological effects, could be removed using photocatalytic degradation, resulting in a low-cost and environmentally friendly solution. Herein, BiVO4 nanoparticles with different morphologies and photocatalytic performances were synthesized by hydrothermal treatment at different residence times. The XRD and SEM results indicate that the crystal phase of BiVO4 gradually transformed from a single tetragonal phase to a single monoclinic crystal phase as the hydrothermal time increased, and with the extension of the hydrothermal time, the morphology of BiVO4 nanoparticles gradually differentiated from a smooth spherical shape to flower-like shapes composed of polyhedrons; the size of the crystals also increased accordingly. Methylene blue (MB), used as a probe of organic pollutants, was degraded under visible light irradiation by all BiVO4 samples to investigate its photocatalytic activities. The experimental results show that the longer the hydrothermal time, the better the photocatalytic performance. The optimum hydrothermal time was 24 h, at which the sample showed the highest photocatalytic activity for MB degradation. This work shows a convenient strategy for control of the crystal phase of BiVO4-based photocatalysts based on the understanding of the crystal morphology evolution mechanism, which will benefit the researchers in designing new BiVO4-based photocatalysts with high efficiency for emerging contaminants' degradation.

Dielectric and Complex Impedance Spectroscopic studies of Microwave synthesized Cupric Oxide nanoparticles

Hexamethylenetetramine (HMT) capped CuO nanoparticles were synthesized by microwave assisted technique. X-ray diffraction analysis confirms the formation of monoclinic single phase of the synthesized particles. The nature of ligand bonding and an estimate of the ligand molecules on the surface of CuO particles were obtained from Fourier Transform Infrared spectroscopy and Thermogravimetric analysis, respectively. Hysteresis measurements performed at 10 and 300 K show both the core-shell nature and the impact of the ligand. Dielectric measurements were performed with a temperature variation of 10 to 325 K and a frequency variation over 126 kHz to 949 kHz range. Broad relaxation peaks, reduction of dielectric constant with size and the presence of anomalies at slight variance to the magnetic transitions observed in bulk material, show signatures of the impact of ligand. Impedance spectroscopic (IS) analysis shows the room temperature impedance to be dominated by grain boundaries and reveals core-shell type of behaviour with conducting grains and insulating grain boundaries. A schematic is proposed with the grain consisting of the ligand capped CuO clusters separated by interfaces/grain boundaries.

Elucidating the pressure-induced enhancement of ionic conductivity in sodium closo-hydroborate electrolytes for all-solid-state batteries

Hydroborates are an emerging class of solid electrolytes for all-solid-state batteries. Here, we investigate the impact of pressure on the crystal structure and ionic conductivity of a close-hydroborate salt consisting of Na2B10H10 and Na2B12H12. Two Na2B10H10:Na2B12H12 ratios were studied, 1:1 and 1:3. The anions of the as-synthesized powder with 1:1 ratio crystallize in a single face-centered cubic phase, while the anions of the powder with 1:3 ratio crystallize in a single monoclinic phase. After applying pressure to densify the powder into a pellet, a partial phase transformation into a body-centered cubic (BCC) phase is observed for both ratios. The BCC content saturates at 50 weight percent (wt%) at 500 MPa for the 1:1 ratio and at 77 wt% at 1000 MPa for the 1:3 sample. The room temperature sodium-ion conductivity follows an analogous trend. For the 1:1 ratio, it increases from 2 × 10–4 Scm−1 at 10 wt% BCC content to about 1.0 × 10–3 Scm−1 at 50 wt% BCC content. For the 1:3 ratio, it increases from 1.3 × 10–5 Scm−1 at 11.9 wt% BCC to 8.1 × 10–4 Scm−1 at 71 wt% BCC content. Our results show that pressure is a prerequisite to achieve high sodium-ion conductivity by formation of the highly conductive BCC phase.

Deep-red-emitting phosphors of Mn4+-activated tantalite for high-sensitivity lifetime thermometry and security films.

Herein, single monoclinic phase Mn4+-doped Sr2InTaO6 (SITO) phosphors were reported in terms of both luminescence behaviors and potential applications. The optimal Mn4+-doped SITO (0.3 mol%) exhibited a good color purity of 92.9% in a deep-red region with achromaticity coordinate of (0.707, 0.293). In addition, the local structure of Mn4+ in the SITO matrix was determined. The crystal-field strength was calculated to be approximately 1781.7 cm-1 whereas the nephelauxetic ratio was determined to be 1.04. Furthermore, the flexible SITO:Mn4+-YAG:Ce3+ security film was fabricated for use in anti-counterfeiting applications, which could emit different colors under various lighting sources. The SITO:Mn4+ phosphors exhibited a high sensing sensitivity based on the luminescence lifetime. Consequently, the SITO:Mn4+ phosphors can be employed in bifunctional platforms of luminescence lifetime thermometry and anti-counterfeiting applications.

Role of A site doped rare earth (Gd3+ and Ho3+) ions in the lattice structure and magnetic properties of biphasic La2−xRExNiMnO6 (RE = Gd, Ho, x = 0.1) double perovskites

The doping effects of a small amount of RE (Gd and Ho) atoms at A (La) sites of La2NiMnO6 double perovskite have been studied by preparing the materials using mechanical alloying of oxide powders and thermal treatment (800–1200 °C), and a direct sintering of the oxide powders at 1300 °C. The synchrotron x-ray diffraction patterns have been used to confirm the formation of single (monoclinic) phase or bi-phased lattice structure depending on thermal treatment temperature. The bi-phased samples are consisting of primary monoclinic phase (P 21/n space group) and secondary orthorhombic phase (Pnma space group). The x-ray photoelectron spectroscopy has confirmed the presence of trivalent La, RE ions, and mixed-valence state of Ni and Mn ions in the samples. The existence of bi-phasic lattice structure and mixed-valence state of Ni and Mn ions have determined magnetic properties. The monoclinic phase has shown ferromagnetic Curie point around 280 K, which has been reduced to low temperature by Gd and Ho doping. The orthorhombic phase has shown weak ferro/ antiferromagnetic spin ordering temperature around 150 K. The experimental results in RE doped La2NiMnO6 double perovskite support a strong correlation between lattice structure and magnetic properties, which depend on doping of RE ions at A sites, electronic charge state of Ni and Mn ions, structural phase components and anti-site disorder of Mn/Ni ions at octahedral sites.

Tuning the melting point and phase stability of rare-earth oxides to facilitate their crystal growth from the melt

The challenge of growing rare-earth (RE) sesquioxide crystals can be overcome by tailoring their structural stability and melting point via composition engineering. This work contributes to the advancement of the field of crystal growth of high-entropy oxides. A compound with only small REs (Lu,Y,Ho,Yb,Er)2O3 maintains a cubic C-type structure upon cooling from the melt, as observed via in-situ high-temperature neutron diffraction on aerodynamically levitated samples. On the other hand, a compound with a mixture of small and large REs (Lu,Y,Ho,Nd,La)2O3 crystallizes as a mixture of a primary C-type phase with an unstable secondary phase. Crystals of compositions (Lu,Y,Ho,Nd,La)2O3 and (Lu,Y,Gd,Nd,La)2O3 were grown by the micro-pulling-down (mPD) method with a single monoclinic B-type phase, while a powder of (Lu,Y,Ho,Yb,Er)2O3 did not melt at the maximum operating temperature of an iridium-rhenium crucible. The minimization of the melting point of the two grown crystals is attributed to the mismatch in cation sizes. The electron probe microanalysis reveals that the general element segregation behavior in the crystals depends on the composition.

Control of optical properties of luminescent BiVO4:Tm3+ by adjusting the synthesis parameters of microwave-assisted hydrothermal method

Microwave-assisted hydrothermal method was used to synthesise single phase sub-microcrystalline BiVO4:Tm3+ powders with two polymorphic crystal structures – tetragonal zircon-type phase (I41/amd) or monoclinic fergusonite-type phase (I2/b). A single tetragonal phase of BiVO4:Tm3+ was obtained at alkaline pH and it was maintained after annealing up to 400°C, while a single monoclinic phase at acidic pH and in the annealing temperature range of 600-900°C. The structural properties of both phases were correlated with their optical properties, such as the energy gap and luminescent properties. It was observed that the crystal structure and the decreasing the crystallites size changes the bandgap value for BiVO4:Tm3+. The NIR luminescence of Tm3+ ions analysed for both structural phases of the samples with the smallest crystallites sizes showed that the emission intensity is higher for the monoclinic phase than for the tetragonal phase.

Investigation of Elastic Properties of WO3 Thin Films Supported on Quartz in Surface Acoustic Wave Sensing Devices

This study aims to discuss the combined theoretical and experimental results of elastic properties of tungsten trioxide films supported on Quartz (YX)/45°/10° resonator to form surface acoustic wave (SAW) devices. The SAW systems with different thicknesses of WO3 thin films were imaged and structurally characterized by X-ray diffraction, atomic force, and transmission electron microscopy. The deposited WO3 films (100, 200, and 300 nm of thickness) crystallized in a single monoclinic phase. The acoustoelectric properties of the SAW system were obtained by combining theoretical simulations with experimental measurements. The modeling of the SAW devices has been performed by the finite element and boundary element methods (FEM/BEM). The elastic constants of the films at room temperature were assessed via electrical admittances experiments in light of theoretical calculations. The gravimetric effect of the deposited layers is observed by a shift of the resonance frequency to lower values as the thickness of the films increases. Moreover, the acoustic losses are affected by the dielectric losses of the WO3 films while the resonant frequency decreases almost linearly. SAW devices revealed strong displacement fields with low acoustic losses as a function of WO3 thicknesses. For all the deposited layers, the measured Young’s moduli and Poisson’s ratios are 8 GPa and 0.5, respectively.

Synthesis and Characterization of Undoped and Mn‐Doped Copper Oxide Nanoparticles

AbstractCopper oxide (CuO) is a p‐type metal‐oxide semiconductor with a bandgap of 1.2 eV and a minimal bandgap. Solar cells, superconductors, and sensors are among the applications for which it is used. To dope transition metals, researchers use a low‐cost soft chemical process (Mn). The aim of this research is to identify CuO nanopowders using a low‐cost soft chemical method to dope transition metals (Mn). The nanopowders' structural, morphological, functional, and optical properties are investigated. X‐ray diffraction (XRD) analysis findings point to the synthesis of high purity single monoclinic phase CuO nanoparticles. The crystallite size (30 nm) and lattice parameters of Mn‐doped CuO samples are reduced. These results suggest that Mn‐doped CuO nanoparticles may be a promising candidate for optoelectronic devices and photocatalytic organic compound degradation.